IECEP GEAS Flashcards
1
Q
An interest rate of 10% compounded
continuously is desired of an investment of
P15,000. How many years will be required to
recover the capital with the desired interest if
P2,500 is received each year?
A
9.375 years A=Pe^(rt) 15,000 = 15,000e^(0.10t -2500t) t = 9.375 years
2
Q
What is the pH level of toilet soap?
A
10
3
Q
A method of nonspontaneous lysing (splitting)
of a substance by the input of electrical
energy, and is often used to decompose a
compound into its elements.
A
electrolysis
4
Q
It is the electrostatic forces of attraction
between oppositely charged ions.
A
ionic bonding
5
Q
It is the term applied to any method of
extinguishing a debt, principal and interest, by
a series of payments, usually at equal
intervals.
A
amortization
6
Q
Date of approval of RA 9292
A
April 17, 2004
7
Q
There are __________ Articles and __________
sections in the RA 9292.
A
8, 43
8
Q
Any person who shall violate any provision of RA
9292 or any rules, regulations, the Code of
Ethics and the Code of Technical Standards of
Practice is stated in section _________.
A
35
9
Q
This act is was consolidation of House Bill No. 5224
and Senate Bill No. 2683.
A
RA 9292
10
Q
The chairperson of the PRC shall include in the
Commission’s program the implementation of RA
9292, the funding of w/c shall be included in the
Annual General Appropriation Act.
A
Sec 40
11
Q
According to section 43, RA 9292 shall take effect
__________ following its full publication in the
__________ or any newspaper of general
circulation.
A
15 days, Official Gazette
12
Q
Who among the following persons was not a
signatory of the 9292?
A
JESUS P. NAZARENO
13
Q
Section 40 of RA 9292.
A
Appropriations
14
Q
Which of the following is not true for the
qualifications of Board Members of Electronics
Engineering?
A
a citizen and a resident of the Philippines for 5
consecutive yrs prior to his appointment
15
Q
All records of the Board, including applications for
the examination, administrative cases involving
PECE, ECE and ECTs shall be kept by
A
PRC
16
Q
The members of the Board shall hold office for a
term of __________ from date of appointment or
until their successors shall have been appointed
and qualified and may be re-appointed once for
another term.
A
3 years
17
Q
Section 7 states that the Board is vested with the
authority to: Adopt an official __________ of the
Board.
A
Seal
18
Q
The compensation and allowances of the Board is
comparable to that being received by the
Chairman and members of existing regulatory
boards under the Commission as provided for in
the __________.
A
Gen Appropriations Act
19
Q
Each member of the Board shall take the/a
__________ prior to the assumption of office.
A
proper oath
20
Q
How much or what fine is required for any person
who shall violate any provision or any rules,
regulations, the Code of Ethics and the Code of
Technical Standards of Practice promulgated under
RA 9292?
A
Not less than Php100,000.00 nor more than Php
1M or by imprisonment of not less than 6 months
nor more than 6 years, or both, in the discretion
of the court.
21
Q
The Board and the __________ shall correct and
rate the licensure examination papers
A
Commission
22
Q
According to section 2-Statement of Policy, the
state shall therefore develop and nurture
competent, virtuous, productive, and __________
PECE, ECE, and ECTs
A
well rounded
23
Q
A candidate for Electronics Engineer or Electronics
Technician who obtains a passing rating in the
majority of the subjects but obtains a rating in the
other subject/s below _________ percent but not
lower than __________ percent, shall be allowed
to take one removal examinations on the subject/s
where he/she failed to obtain the passing rating.
A
70, 60
24
Q
Within __________ years after the effectivity of RA
9292, the Board shall issue Certificate of
Registration and Professional Identification Cards
without examination to all applicants for
registration as Electronics Technicians who comply
to all the requirements stated in section 20.
A
5 (five)
25
With reference to prob 22, all
submittals/documents shall be accompanied by a
certification from __________ registered PECEs
vouching for the integrity, technical capability and
good moral character of the applicant.
at least 3
26
It is a method of managing all the activities that
affect the quality of goods or services in order
to prevent faults.
Quality Assurance
27
This type of business organization can be set
up without any formality. It exist when there
are a number of people involved who are part
owners of the business
Partnership
28
Items purchased from a vendor cost Php
20 each, and the forecast for next year‟s
demand is 1,000 units. If it costs Php 5
every time an order is placed for more
units and the storage cost is Php 4 per unit
per year, what quantity should be order
each time?
```
50 units
Q = √(2DS/H) = √((2(1000)(5))/4) = 50 units
Where
D = Demand
S = Ordering cost
H = Storage cost/holding cost
```
29
This process can be used to measure
achievement in Total Quality Management
(TQM) system. Also it provides the essential
control and measure feedback loop necessary for
quality improvement
Benchmarking
30
A project has been defined to contain the
following list of activities, along with their
required times for completion
What is the completion time of the whole
project?
25 days
31
Here are the monthly data for the past 8 months.
From these data, what are the forecasts for the
following 4 months using linear regression?
```
9th-
-997, 10th
- 1067.67, 11th
– 1138.33, 12th
– 1209
```
32
It is the process of attracting potential
employees to the company so that the selection
process can be carried out.
Recruitement
33
It is the name given to any activity undertaken by
the organization with the express purpose of
gaining information about potential customer
Market Research
34
It is used when product are made singly or in
small batches. It happens when a small number
of products are processed at each storage before
going on to the next stage.
Job Production
35
It involves a voluntary association of people,
called members, who operate an enterprise
collectively. The aim of this organization is not to
make profit but to give support to their
members.
Cooperatives
36
It is the rational way to ensure that our limited
| time is always used effectively
Time Management
37
A hole is to be punched out of plate having a
shearing strength of 40 ksi. The compressive
stress in the punch is limited to 50 ksi.
Compute the maximum thickness of plate from
which a hole 2.5 inches in diameter can be
punched.
0.781 in
| t = 2.5(50) / 4(40) = 0.781 inches
38
A hole is to be punched out of plate having a
shearing strength of 40 ksi. The compressive
stress in the punch is limited to 50 ksi. If the
plate is 0.25 inches thick, determine the
diameter of the smallest hole that can be
punched
0.800 in
| D = 4(0.25)(40) / 50 = 0.800 inches
39
A large pipe, called a penstock in hydraulic
work, is 1.5 m in diameter. It is composed of
wooden staves bound together by steel hoops,
each 300 sq. Millimetre in cross-sectional
area, and is used to conduct water from a
reservoir to power a house. If the maximum
tensile stress permitted in the hoops is 130
MPa, what is the maximum spacing between
hoops under a head of water of 30 m?
```
177 mm
(1000)(9.81)(30)(1.5)L = 2(300x10^-6)(130x10^6)
L = 177 mm
```
40
At what angular velocity will the stress in a
rotating steel ring equal to 150 MPa if its mean
radius is 220 mm? The density of the steel is
7.85 Mg/m^3.
628 rad/s
| ω = (1/0.22)(150x10^6 / 7850)^(1/2) = 628 rad/s
41
A pipe carry steam at 3.5 MPa has an outside
diameter of 450 mm and a wall thickness of 10
mm. A gasket is inserted between the flange at
one end of the pipe and a flat plate use to cap
the end. How many 40-mm-diameter bolts
must be used to hold the cap on if the allowable stress in the bolts is 80 MPa, of
which 55 MPa is the initial stress?
17
N = (3.5x10^6)(0.45 – 2x0.01)^2 /
[(0.04^2)(88–55)x10^6] = 16.18 round up
42
A pipe carry steam at 3.5 MPa has an outside
diameter of 450 mm and a wall thickness of 10
mm. A gasket is inserted between the flange at
one end of the pipe and a flat plate use to cap
the end. What circumferential stress is
developed in the pipe?
75.3 MPa
| ζ = (3.5)(450 – 2x10) / [2(10)] = 75.3 MPa
43
It is the maximum safe stress that a material
| can carry
working stress
44
It is the point at which there is an appreciable
elongation of the material without any
corresponding increase of load
Yield point
45
This component measures the pulling (or
| pushing) action perpendicular to the section
Axial forces
46
A steel rod having a cross-sectional area of
300 sq. Meters and a length of 150 m is
suspended vertically from one end. It supports
a tensile load of 20 kN at the lower end. If the
unit mass of steel is 7850 kg/m^3 and E =
200x10^3 MN/m^2, find the total elongation of
the rod.
54.3 mm
δ = [(7850)(9.8)(150^2) / 2(200X10^9)] +
[(20000)(150)(1000^2) / 300(200X10^9)]
δ = 54.3 mm
47
What is the theoretical maximum value of
Poisson‟s ratio of any given material subjected
to a uniform triaxial stress.
½
48
A steel bar 50 mm in diameter and 2 m long is
surrounded by a shell of cast iron 5 mm thick.
Compute the load that will compress the
combined bar a total of 0.8 mm in the length of
2m. For steel E = 200 GPa, and for cast iron E
= 100 GPa
192 kN
P = [(π/4)(0.05^2)(200x10^9)(0.0008)/2] +
[(π/4)(0.06^2 – 0.05^2) (100x10^9) (0.0008)/2]
P = 192 kN
49
A solid steel shaft 5 m long is stressed to 80
MPa when twisted through 4 degrees. Using G
= 83 GPa, compute the shaft diameter.
138 mm
r = (80)(5) / [(4)(π/180)(83000)] = 69 mm
d = 2(69) = 138 mm
50
A solid steel shaft is not to twist through more
than 3 degrees in a 6 m length when subjected
to a torque of 12 kN.m. What maximum
shearing stress is developed? Use G=83GPa.
```
41.3 MPa
(π/4)d^4 = (12000)(6) / [(3)(π/180)(83x10^9)]
d = 114 mm
η = 16(12000) / [π(.114)^3]
η = 41.3 MPa
```
51
What is the minimum diameter of a solid steel
shaft that will not twist through more than 3
degrees in a 6 m length when subjected to a
torque of 12 kN.m? Use G=83GPa.
114 mm
(π/4)d^4 = (12000)(6) / [(3)(π/180)(83x10^9)]
d = 114 mm
52
A steel rod 2.5 m long is secured between two
walls. If the load on the rod is zero at 20
degree Celsius, compute the stress when the
temperature drops to -20 degrees Celsius. The
cross-sectional are if the rod is 1200 sq. mm,
coefficient of linear expansion = 11.7 um/(mdeg.C),
and E = 200 GPa. Assume that the
walls are rigid.
93.6 MPa
ζ = (200x10^9)(11.7x10^-6)(20 - -20)
= 93.6x10^6 Pa
ζ = 93.6 MPa
53
Determine the maximum shearing stress in a
helical steel spring composed of 20 turns of 20
mm-diamter wire on a mean radius of 80 mm
when tha spring is supporting a load of 2 kN.
Use G = 83 GPa.
```
120.6 MPa
m = 80/10 = 8
η = [16(2000)(0.08) / π(0.02)^3] x {[4(8)-
1]/[4(8)-4] + (0.615/8)}
η = 120.6 MPa
```
54
Determine the elongation in a helical steel
spring composed of 20 turns of 20 mm-diamter
wire on a mean radius of 80 mm when tha
spring is supporting a load of 2 kN. Use G = 83
GPa
98.7 mm
δ = 64(2000)(0.08^3)(20) / [(83x10^9)(0.02^4)]
δ = 98.7 mm
55
These are components of the total resistance
to sliding the portion to one side of the
exploratory section past the other.
Shear forces
56
Who first postulated that stress is proportional
| to strain in 1678?
Robert Hooke
57
It explains combustion as a result of loss of
| a substance
Phlogiston
58
The volume of a definite quantity of dry
gas is inversely proportional to the
pressure provided the temperature
remains constant.
Boyle’s Law
59
It refers to matter that do not have definite
| form or structure.
Amorphous
60
Three grams of sulphur dissolved in 200 g
of naphthalene C10H8, was found
decreasing the freezing point of the solvent
to 0.72 ⁰C. Find the molecular weight of
the solute. (Kf C10H8 = 6.9 ⁰C/molar)
135.61 g/mole
61
Substance having a pH level less than 7
Base
62
It is the enthalpy change associated with
the condensation of gaseous positive and
negative ion into a crystal.
Lattice Energy
63
It is a product of the weathering of complex
silicates, particularly of feldspars which are
abundant minerals.
Clay
64
Electrons occupy all the orbitals of a given
subshell singly before pairing begins.
These unpaired electrons have parallel
spins. This is known as:
Hund’s rule
65
This law states that at constant
temperature the volume of a sample of gas
varies inversely with the pressure.
Boyle’s Law
66
It is the scattering of light by colloidal
| particles
Tyndall Effect
67
Consider H3AsO3, Arsenic acid
(H=1.01,As=74.9,O=16.0).How many mole
is 1kg of H3AsO3?
7.94 moles
H3AsO3 = 3(1.01 g/mol) + 74.9 g/mol + 3(16.0 g/mol)
= 125.93 g/mol
moles H3AsO3 = (1kg)(1 mol/125.93g)
68
It is customary to indicate accuracy by
using a certain numbers of figures or
digits.
significant figures
69
It is required for organic compounds
Carbon
70
```
Term used to denote the technology of
treating a mined ore to obtain a product
higher on concentration of a wanted
mineral from the unwanted rock mass in
which it occurs.
```
Ore dressing
71
It states that, "If a stress is placed on a
system on equilibrium whereby the
equilibrium is altered, that change will take
place which tends to relieve or neutralize
the effect of the added stress".
Le Chatelier's Principle
72
The energy possessed by a substance that
allows it to be changed into a new
substance.
Chemical energy
73
If heat is absorbed by the system during a
| chemical change, it is called as:
Endothermic
74
Who determined the quantitative relationship
between the amount of electricity used in
electrolysis and the amount of chemical
reaction that occurs?
Michael Faraday.
75
It is considered as derivatives of ammonia in
which one or more of the hydrogens have
been replaced by the alkyl or aryl group. It is
characterized by unpleasant odors.
Amines
76
Calculate the ratio of the rate of diffusion of
hydrogen to the rate of diffusion of oxygen.
How fast does hydrogen diffuse than oxygen?
Given: Density of oxygen is 0.0899 g/L and the
density of oxygen is 1.43 g/L.
Four
77
What is the volume of 1 moles of a gas at 2
| atm and 273 K?
11.2L
| V= 224 L x (n/1mol) x (1atm/2atm) =11.2L
78
It is a borosilicate glass with a very low coefficient
of thermal expansion, hence, it's wide for cooking
and serving utensils.
Pyrex
79
What is the mass in kilograms of 10.5 gal (39.7 L)
| of gasoline with a specific gravity of 0.82.
33 kg
```
Specific gravity of gasoline is 0.82
Density = 0.82 times the density of water
Density= specific gravity x density of water
=(0.82)(0.997)
= 0.82 g/mL
V=39.7L = 39700 mL
M= D x V
=(0.82)(39700)
=33 kg
```
80
It is a colorless solid capable of being cut into
brilliant crystals is the hardest, must abrasive
mineral known
Diamond
81
It is the calculation of both energy balances and
| material balances in a chemical system
Stoichiometry
82
_________ involves the replacement of one of
the atoms or groups of atoms attached to the
carbon “Backbone” of the organic molecule
Substitution Reaction
83
Calculate the volume (in Litres) occupied by
7.40g of NH3 at STP (Standard Temperature,
and Pressure)
9.73L
Recognizing that 1mole of an ideal gas is
equal top 22.4L at STP and using the molar
mass of NH3 (17.03g)
V = 7.40g NH3 x 1 mol NH3 x 22.4L__ = 9.73L
17.03g NH3 1 mol NH3
84
It is the Energy change accompanying a mole
of electrons being added to a mole of a
gaseous atoms or ions
Electronic Affinity
85
A 466g sample of Water is Heated from 8.50‟C
to 74.60‟C. Calculate the amount of Heat
Absorbed (in Kilo Joules) by the Water.
129 KJ
q = ms t
= (466g)(4.184 J/g „C)(74.60‟C – 8.50‟C)
= 129 KJ
86
A silicon chip used in an integrated circuit of a
microcomputer has a mass of 5.68mg. How
many silicon (Si) atoms are present in this
chip?
1.22x10^20atoms
5.68mg Si x 1g Si x 1mol Si x 6.022x1023
1,000 mg Si 28.08 g Si 1 mol Si
= 1.22x1020atoms
87
This Law states that if a process can be written
as the sum of several stepwise processes, the
Enthalphy change the total process equals the
sum of the Enthalphy changes of the Various
Steps.
Hess Law
88
This process separates the components of a
mixture on the basis of differences in particle
size. It is used most often to separate a liquid
from a solid.
Filtration
89
Sulfur Hexafluoride (SF6) is a colorless,
odorless, very unreactive gas. Calculate the
pressure (in atm) exerted by 1.82 moles of gas
in a steel vessel of volume 5.43L at 45°C.
8.75 atm
```
P = _nRT_
V
P = (1.82mol) (0.0821L.atm/K.mol) (45+273K)
5.43
P = 8.75 atm
```
90
It is defined as the pressure exerted by a force
of one newton acting on an area of one square
meter
Pascal
91
A bottle of certain ceramic tile cleanser, which
essentially a solution of hydrogen chloride,
contains 130g of HCl and 750g of water. What
is the percent by mass of HCl in this cleanser?
14.8%
```
%solute = mass solute_ x 100
mass solution
%solute = ____130g____ x 100
130g + 750g
%solute = 14.8%
```
92
A covalent bond between two atoms with
different electronegativities, so that the
electron density is unsymmetrically distributed.
Polar bond
93
Which element has the highest ionization
| potential of its atom?
Helium
94
It is the minimum amount of radioactive
material needed to sustain a nuclear chain
reaction.
critical mass
95
In the atmosphere, nitrogen dioxide reacts
with water to produce nitric acid, which
contributes to pollution by acid rain:
3NO2(g) + H2O(l) -----> 2HNO3(aq) + NO(g)
How many grams of HNO3 are produced
for every 1.0mol of NO2 that reacts? The
molecular weight of HNO3 is 63.0amu.
42 g HNO3
1.0mol NO2(2mol HNO3/3mol NO2)(63g
HNO3/1mol HNO3)=42g HNO3
96
_________ states that a constant pressure
and temperature, the volume of a gas is
directly proportional to the number of
moles present.
Avogadro’s Law
97
______ states that in the addition of polar
reagents to alkenes, the positive portion of
the reagents adds to the carbon atom in
the double bond that already has the most
hydrogen atoms.
Markovnikou’s rule
98
_______ are atoms that have completely
filled ns and np subshells, giving them
great stability
Nobles Gases
99
_______ states that the partial pressure of
a solvent over a solution is given by the
vapor pressure of the pure solvent times
the mole fraction of the solvent in the
solution
Raoult’s Law
100
The position x of an experimental rocket
moving along a long rail is measured to be x(t)
= (4m/s)t + (7m/s2
)t2
+ (5m/s3
)t3
– (0.35m/s4
)t4
over the first 10s of its motion, where t is in
seconds and x is in meters. Find the velocity of
the rocket for the first 10 seconds.
```
244m/s
v = dx/dt = (4m/s) + (14m/s2
)t + (15m/s3
)t2
–
(1.4m/s4
)t3
Substituting t = 10 s, gives
v = 244 m/s
```
101
Early in the nineteenth century, James Watt
invented the steam engine. In order to
convince people, who relied heavily on horses
for mechanical work, he demonstrated how
useful his steam engine was by utilizing a
horse that lifted water from a well over a
certain period of time and called the
corresponding power expended “one
horsepower”. Assume that water has a mass
density of 1.0 x 103
kg/m3
, that the well was
20m deep, and that the horse worked for 8
hours. How many liters of water did the horse
raise from the well? Use the following
constants: 1 hp = 746 Watts, g = 9.8 m/s2
.
```
1.1 x 105 L
The work done of the tension in lifting a mass
of water is given by:
W = m g y where W = work, m = mass =
pV, y = distance, V = volume,
p= mass density,
The power is given by:
P = work /time,
t
Vg y
Substituting all values, we get for V
V =
2 3
3 3 2
1.1 10
1 10 / 9.8 / 20
746 8 3600 /
x m
x k g m m s m
W hx s h
Since 1 m3
= 103
L, then V = 1.1 x 105
L.
```
102
As provided in ACT 3846, the construction of a
| radio station shall begin only when
The NTC has already issued a Permit to
| construct.
103
As provided in RA7925, a VAS provider needs
| to secure a franchise if
it puts up its own network.
104
According to the code of ethics, if you are
employed in a company and you wish to
engage in a business which may compete with
your company, the most ethical thing to do is
to
inform your employer about it
105
An investor has an option to purchase a tract
of land that will be worth P20,000 in seven
years. If the value of the land increases at 9%
each year, how much should the investor be
willing to pay now for this property?
P10,941
106
Suppose that you make 12 equal annual
deposits of P2,000 each into a bank account
paying 8% interest per year. The first deposit
will be made one year from today. How much
money can be withdrawn from this bank
account immediately after the 12th deposit?
37,954
107
What is the effective rate of interest if P1000 is
invested at a nominal rate of 15%
compounded quarterly?
15.86%
108
A man purchased a house for P425,000. In the
first month that he owned the house, he spent
P75,000 on repairs and remodeling.
Immediately after the house was remodeled,
he was offered P545,000 to sell the house.
After some consideration, he decided to keep
the house and have it rented for P4,500 per
month starting two months after the purchase.
He collected rent for 15 months and then sold
the house for P600,000. if the interest rate was
1.5% per month, how much extra money did
he make or lose by not selling the house
immediately after it was remodeled?
P5,000
109
On the day his grandson was born, a man
deposited to a trust company a sufficient
amount of money so that the boy could receive
five annual payments of P20,000 each for his
college tuition fees, starting with his 18th
birthday. Interest at the rate of 12$ per annum
was to be paid on all amounts on deposit.
There was also a provision that the grandson
could elect to withdraw no annual payments
and receive a single lump amount on his 25th
birthday. The grandson chose this option. How
much did the grandfather deposit?
P10,500
110
A man bought an equipment costing P30,000
payable in 12 quarterly payments, each
installment payable at the beginning of each
period. The rate of interest is 24%
compounded quarterly. What is the amount of
each payment
P3,700
111
A telecommunication company purchased an
equipment for P53,000 and paid P1,500 for
freight and delivery charges to the job site. The
equipment has a normal life of 10 years with a
trade-in value of P5,000 against the purchase
of a new equipment at the end of the life.
Determine the annual depreciation cost by the
sinking fund method. Assume interest at 6.5%
compounded annually.
P3.,668
112
A plant bought a machine for P200,000 and
used it for 10 years, the life span of the
equipment. What is the book value of the
machine after 5 years of use? Assume a scrap
value of P20,000. Use double declining
balance method.
P65,536
113
It occurs when a cutting action is applied as
you would see with scissors, tin snips, or
punches.
Direct shear
114
It occurs when a member carries a load
perpendicular to its long axis while being
supported in a stable manner.
Bending stress
115
It is the internal resistance offered by a unit
area of the material from which a member from
which a member is made to an externally
applied load.
stress
116
A certain support stand design to carry
downward loads. Compute the stress in the
square shaft at the upper part of the stand for
a load of 27,000 lb. The line of action of the
applied of the applied load is centered on the
axis on the shaft, and the load is applied
through a thick plate that distributes the force
to the entire cross section of the stand.
12,000psi
117
The proportional limit is the value of stress on
the stress-strain diagram curve at which the
curve first deviates from a straight line.
Proportional limit
118
It is the value of stress on the stress-strain
curve at which the material has deformed
plastically; that is, it will no longer return to its
original size and shape after removing the
load.
Elastic limit
119
It is the value of stress on the stress-strain
curve at which there is a significant increase in
strain with little or no increase in stress.
Yield point
120
It is the highest value of apparent stress on the
| stress-strain curve.
Tensile point
121
It is a measure of the stiffness of a material
determined by the slope of the straight-line
portion of the stress-strain curve.
Modulus of elasticity
122
A ductile material is one that can be stretched,
formed, or drawn to a significant degree before
fracture. A metal that exhibits a percent
elongation greater than ____ % is considered
to be ductile.
5
123
A brittle material is one that fails suddenly
under load with little or no plastic deformation.
A metal that exhibits a percent elongation
____ 5.0% is considered to be brittle
Less than
124
The ratio of shearing stress to shearing strain
| is called:
Modulus of rigidity
125
It is the ability of a material to absorbed
| applied energy without failure
Toughness
126
It is the indication of the resistance of a
| material to indentation by a penetrator.
Hardness
127
It is a measure of pulling and pushing force.
Axial force
128
It is the measure of the total resistance to
| sliding.
Shear force
129
It is the measure of the resistance to twisting.
Torque
130
```
A common bar suspended from certain
support has axial load of 10kN. If the bar has a
cross section of 20mm2
, find the stress
experience by the bar.
```
500MPa
131
Assume that a 25-mm diameter rivet joins the
plates that are each 125 mm wide. The
allowable stresses are 130 MPa for bearing in
the plate material and 65 MPa for shearing of
the rivet. Determine the minimum thickness of
each plate
40MPa
132
A cylinder pressure vessel is fabricated from
plates which have a thickness of 20mm. The
diameter of the pressure vessel is 450 mm and
its length is 3.5m. Determine the maximum
internal pressure which can be applied if the
stress in the steel is limited to 150MPa.
16.67MPa
133
The wall thickness of a 3ft-diameter spherical
tank is 4/17 in. Calculate the allowable internal
pressure if the stress is limited to 9000 psi.
176.47psi
134
A steel bar 40mm in diameter and 3m long is
surrounded by a shell of cast iron 6mm thick.
Compute the load that will compress the
combined bar a total of 0.95 mm in the length
of 2m. For steel E=300GPa, and for cast iron,
E=150GPa.
161kN
135
A steel rod 3.5m long is secured between two
walls. If the load on the rod is zero at 30°C,
compute the stress when the temperature
drops to -30°C. The cross sectional area of the
rod is 1200mm2
, α =11.7um/(m°C), and
E=200GPa.
140MPa
136
A steel shaft 3ft long that has a diameter of 5in
is subjected to a torque of 14kip-ft. Determine
the maximum shearing stress. G=12x106
psi.
0.47°
137
What is the minimum diameter of a solid steel
shaft that will not twist through more than 4° in
a 6m length when subjected to a torque of
13kN-m? What max shearing stress is
developed? G=85 GPa
107.6mm
138
Determine the elongation in a helical steel
spring composed of 20 turns of 20-mm
diameter wire on a mean radius of 90 mm
when the spring is supporting a load of 2.5kN.
Use G=83 GPa.
175mm
139
It is the transfer of energy from the more
energetic particles of substance to the
adjacent less energetic ones as a result of
interactions between the particles.
Conduction
140
It indicates that the rate of heat conduction in a
direction is proportional to the temperature
gradient in that direction.
Fourier’s Law of Heat Conduction
141
Which of the following is considered the best
| conductor of heat?
Diamond
142
It is the mode of energy transfer between a
solid surface and the adjacent liquid or gas
that is in motion, and it involves the combined
effect conduction and fluid motion.
Convection
143
It is the energy emitted by the matter in the
form of electromagnetic waves as a result of
the changes in the electronic configurations of
the atom or molecules.
Radiation
144
It states that energy can neither be destroyed
| nor created; it can only change forms.
First law of thermodynamics
145
In second law of thermodynamic, which of the
following state that no heat engine can have a
thermal efficiency of 100% or as far as power
plant to operate, the working fluid must
exchange heat with the environment as well as
the furnace.
Kelvin –Plank Statement
146
In second law of thermodynamic, which of the
following state that no device can transfer heat
from cooler body to a warmer one without
leaving an effect on the surroundings.
Clausius Statement
147
It is defined as the amount of light output in
| lumens per W of electricity consumed.
Light efficacy
148
Carnot cycle is composed of how many
| reversible processes?
4
149
Which of the following processes are involved
| in carnot cycle?
Two adiabatic ; two isothermal
150
State that the thermal efficiencies of all
reversible heat engines operating between the
same two reservoirs are the same, and that no
heat engine is more efficient than a reversible
one operating between the same two
reservoirs.
Carnot principle
151
A carnot heat engine receives 500KJ of heat
per cycle from a high-temperature source at
600 °C and rejects heat a low temperature sink
at 40°C. Determine the thermal efficiency of
this Carnot engine.
64.15%
152
A piston cylinder device contains a liquid-vapor
mixture of water at 400K. During a constant
pressure process, 700 KJ of heat is transferred
to the water. As a result, part of the liquid in
the cylinder vaporizes. Determine the entropy
change of the water during this process
1.75kJ/K
153
Which of the following equation of state has
| two constants?
Vander Waals Equation
154
How many constant are there in Strobridge
| Equation of State?
16
155
Which of the following equation of state has
| eight constant?
Benedict-Webb-Rubin Equation
156
Consider a person standing in a breezy room
at 22°C. Determine the total rate of heat
transfer from this person if the exposed
surface area and the average outer surface
temperature of the person are 1.2 m2 and
33°C, respectively, and the convection heat
transfer coefficient is 6 W/m2
.ε=0.95 and
ζ=5.67x10-8 W/m4
-K
4
143.2J/s
157
A piston cylinder device initially contains 0.8
m
3 of air at 110kPa and 80°C. The air is now
compressed to 0.2 m3 in such a way that the
temperature inside the cylinder remains
constant. Determine the work done during this
process.
-122kJ
158
It is the energy possesses by the system as a
result of its elevation with respect to the
gravitational acceleration of the earth.
Potential
159
It states that if two bodies are in thermal
equilibrium with a third body, they are also in
thermal equilibrium with each other.
Zeroth law of thermodynamics
160
Determine the mass of the air in a room whose
dimensions are (5x6x7) cm at 105 kPa and
27°C.
256.1 g
161
Heat is transferred to a heat engine from a
furnace at a rate of 92MW. If the rate of waste
heat rejection to a nearby river is 45MW,
determine the net power output and the
thermal efficiency for this heat engine.
51.09%
162
The food compartment of a refrigerator is
maintained at 4°C by removing heat from it at
a rate of 300 KJ/min. If the required power
input to the refrigerator is 3KW, determine the
coefficient of performance of the refrigerator.
1.67
163
A 50 kg iron block at 80°C is dropped into an
insulated tank that contains 0.5 m3 of liquid
water at 25°C. Determine the temperature
when thermal equilibrium reached. The
specific heat of iron is 0.45kJ/kg-°C and for
water is 4.18kJ/kg-°C.
25.6°C
164
A rigid tank contains a hot fluid that is cooled
while being stirred by a paddle wheel. Initially,
the internal energy of the fluid is 850kJ. During
the cooling process, the fluid loses 550kJ of
heat, and the paddle wheel does 200kJ of
work on the fluid. Determine the final energy of
the fluid. Neglect the energy stored in the
paddle wheel.
500kJ
165
Three moles of an ideal gas are compressed
slowly and isothermally from a volume of 5 to
1.5 ft3
, at a temperature of 320K. How much
work is done?
-9.61kJ
166
A 4-in wall of fire brick, k=9 Btu/(ft2
-hr-F/in),
has one surface at 300F, the other at 90F.
Find the heat conducted through the area of
2ft2
in 1 day
22, 680Btu
167
If 80 g of iron shot at 100C is dropped into 200
g of water at 20C contained in an iron vessel
of mass 50 g, find the resulting temperature.
24.6°C
168
When a 2lb of brass at 212°F is dropped into
5lb of water at 35°F, the resulting temperature
is 41.2°F. Find the specific heat of brass in
Btu/lb-°F.
0.091
169
How much heat is necessary to raise the
temperature of 0.80 kg of ethyl alcohol from
15°C of its boiling point 78.3°C?
30kca
170
The weight-density of air at 32F and 29.92 in
Hg pressure is 0.081 lb/ft3
. What is its weightdensity,
in lb/ft3
, at an altitude where the
pressure is 13.73 in Hg and the temperature is
-40F?
0.044
171
How many zeroes in the measurement
| 0.00020040 are significant?
Three
172
Which of the following describes a chemical
| change?
Tarnishing silver
173
A homogenous mixture can be separated by
| all of the following methods except
Filtration
174
Which of the following is not a pure
| substance?
Milk
175
A laboratory experiment was performed to
determine the percent by mass of water in a
hydrate. The accepted value is 36.0% water
whose observed value has an error of 5.00%.
Find the percent by mass of water.
37.8% water
| 36% * 1.05 =37.8%
176
Which of the following phase changes
| represent sublimation?
Solid to gas
177
The amount of energy needed to change a
given mass of ice to water at constant
temperature is called the heat of
Fusion
178
Which of the following is a binary compound?
Hydrochloric acid
179
An example of a ternary compound is
Potassium chlorate
180
What is the charge of a hydrogen atom?
0
181
The impossibility of knowing both the precise
location and velocity of subatomic particle at
the same time is known as the
Uncertainty principle
182
An atom which has the greatest ability to
| attract electron is
Oxygen
183
From the reaction,
2NO+02 to 2NO2
How many molecules NO2 of can be
formed using 2 molecules of NO?
2
184
If the volume of the mole of gas molecules
remains constant, lowering the temperature
will make the pressure
Increase
185
Whenever you have equal volumes of gases at
the same temperature and pressure, the
volume must
Contain equal number of particles
186
What pressure must be applied to 225mL of
| gas at 1atm to reduce its volume to 100mL?
2.25atm
| P1V1=P2V2
187
How many moles of O2 are present in 44.8L of O2
| at STP?
2.0moles
| At STP, 1 mole will occupy 22.4L
188
The properties of solution include all of the
| following except that
Dissolved particles will settle out upon
| stirring
189
Suppose that energy Q is required to
accelerate a car from rest to v, neglecting
friction. How much added energy would be
required to increase the speed from v to 2v?
3Q
190
Suppose you want to store 1.00 J of electric
potential energy in a volume of 1.00 m3
in
vacuum. What is the magnitude of the required
electric field?
0.475 MV/m
191
Material a is a water and material b is a glass
with index of refraction 1.52. If the incident ray
makes an angle of 60o with the normal,find the
direction of the reflected ray.
60°
192
The wavelength of the red light from a heliumneon
sensor is 633 nm in air but 474 nm in the
aqueous humor inside our eyeballs. Calculate
the speed of light in this substance.
2.25 x 108 m/s
193
A spaceship moving away from Earth with
speed of 0.900c fires a robot space probe in
the same direction as its motion, with speed of
0.700c relative to the spaceship. What is the
probe‟s velocity relative to the Earth?
0.982c
194
In optics, this effect refers to the blurring of the
image produced on a concave mirror due to
the convergence of rays far from the mirror to
other points on the principal axis. What do you
call this effect?
spherical aberration
195
In fluid mechanics, this shows that the
pressure of a fluid decreases as the speed of
the fluid increases. In addition, the pressure of
a fluid decreases as the elevation increases
Bernoulli’s equation
196
In electrodynamics, what term refers to the
| average speed of the charge carriers?
drift speed
197
In electromagnetics and wave theory, what
refers to waves, commonly generated by
electronic devices, whose wavelengths ranges
from approximately 0.3m to 10-4 m. Due to
their short wavelengths these are often used in
radar systems and for studying the atomic and
molecular properties of matter.
Microwaves
198
The property of a substance which remains
constant if no heat enters or leaves the
system, while it does work or alters its volume,
but which increases or diminishes should a
small amount of heat enter or leave.
Entropy
199
The quantity of heat required to change the
| temperature of unit mass through one degree
Specific Heat
200
“If the temperature of a given quantity of gas is
held constant, the volume of the gas varies
inversely with the absolute pressure during a
change of state”
Boyle’s Law
201
An internally reversible process of a substance
| during which the pressure remains constant
Isobaric
202
The energy stored in a substance by virtue of
the activity and configuration of its molecules
and of the vibration of the atoms within the
molecules
Internal Energy
203
“When two bodies, isolated from other
environment, are in thermal equilibrium with a
third body, the two are in thermal equilibrium
with each other” is a statement of……..
Zeroth Law
204
Not all energy received as heat by a heatengine
cycle can be converted into mechanical
work, some are also rejected” is a statement
of…….
2nd Law of Thermodynamics
205
The combined mass of car and passengers
travelling at 72 km/hr is 1500kg. Find the
kinetic energy of this combined mass.
300kJ
206
A mass of 5kg is 100m above a given datum
where local g=9.75 m/sec2
. Find the
gravitational force in newton‟s and the
potential energy of the mass w/ respect to the
datum
48.75 N,4875 J
207
A pressure gage register 50 psig in a region
where the barometer is 14.25 psia. Find the
absolute pressure in Pa
443 kPa
208
During an isentropic process of 1.36 kg/sec of
air, the temperature increases from 4.44° C to
115.6°C. if Cp=1.0062kNm for a non-flow
process,
kg∙K
what is ∆H?
152.2 kJ/s
209
This Law States that “ The quantity of the
substance entering the system is equal to the
substance leaving the system”
Law of Conservation of Mass
210
“if the pressure of a given quantity of gas is held
constant, the volume of the gas varies directly with
the absolute temperature”
Charles’ Law
211
“The Acceleration of a particular body is directly
proportional to the resultant force acting on it and
inversely proportional to its mass” is a statement
of
Newton’s 2nd Law of Motion
212
“Energy is neither created nor destroyed, but is
| converted from one form to another”
1st Law of Thermodynamics
213
These materials are hard and brittle, insulative
to electricity and heat, and very resistant to
high temperatures and harsh environments.
Ceramics
214
These materials have a large number of nonlocalized
electrons, as an effect are very good
conductors of electricity and heat. They are
strong yet deformable, and extensively used in
structural applications.
Metals
215
Materials composed of more than one material
type and are designed to display a
combination of the best characteristics of each
component material.
Composites
216
A material whose atomic arrangement occurs
as periodic, repeating structures over large
distances.
Crystalline
217
An elemental solid having a different crystal
structure, usually due to the prevailing
temperature and pressure.
Allotrope
218
This metal is alloyed with steel to give it
corrosion resistance properties, resulting in
“stainless steel.”
Chromium
219
This element is used in modern, super strong
permanent magnets because of their high
coercivities.
Neodymium
220
The deterioration of an engineered material
due to interaction with diverse environments
which lead to the degradation of its material
properties.
Corrosion
221
The force of 600 N is the resultant of the
forces F1 and 240 N acting as shown in the
figure. Which of the following gives the value
of F1.
698.9223 N, 56.310 with respect to the
| horizontal
222
The coefficient of friction between the rope and
fixed post is 0.30. The rope is wrapped only once
around the post. Which of the following gives the
minimum tension in the rope at pt A
138.6873 N
223
Given the set of parallel forces shown, which
| of the following gives the resultant force.
90 KN down, 3.33m fr A
224
The resultant of the concurrent forces has a
magnitude of 1200 N and acts through the
origin and points x = 3m, y = 4m, z = 5m.
Which of the following gives the x component
of the resultant force
509.1146 N
225
From the speed of 100 kph, a car decelerates
at the rate of 15 m/min/sec along a straight
road. Which of the following gives the distance
travelled at the end of 40 sec.
911.112 m
226
The velocity of a particle moving along the x
axis is defined by v = x4
+ 2x3
– 3x2
where v is in m/s and x is in m. Which of the
following gives the velocity when x = 2m.
20 m/s
227
The block shown reaches a velocity of 10 m/s
in 25 m starting from rest. Which of the
following gives the coefficient of kinetic friction
between the block and the ground.
0.2626
228
The normal acceleration of a particle on the
rim of a pulley 10 ft in diameter is constant at
1200 fps2
. Which of the following gives the
speed of the pulley in rpm.
147.9371
229
A 350 N block is resting on a plane inclined at
300 with the horizontal is subjected to a
constant force of 400 N acting parallel to the
inclined plane. After the block has moved 3 m
from rest, the 400 N force was removed.
Coefficient of friction is 0.2. Which of the
following gives the distance that the block will
move further along the inclined plane until it
stop
2.714m
230
The force system consist of a clockwise couple
of 600 N-m plus a 300 N force directed to the
right through the origin of x & y axes at
θx = 300
.If the system is replaced by an equivalent
single force, which of the following is its x and
y intercept.
4 m left and 2.3094 below the origin
sin 30 = 2/x, x = 4m left of origin
tan 30 = y/x, y = 2.3094m above the origin
231
Calculate the molar concentration of a solution
that contains 15g of potassium hydroxide in
225ml of solution.
1.2 M
