EE SET 2

Question 1

The primary of an ideal transformer has 100 turns and the secondary has 600 turns. Then:
A. The power in the primary circuit is less than that in the secondary circuit
B. The voltage in the two circuits are the same
C. The primary current is six times the secondary current
D. The currents in the two circuit are the same

Answer 1

The primary current is six times the secondary current

Question 2

During a short circuit test, the iron losses are negligible because:
A. current is high
B. power factor is low
C. none of these
D. mutual flux is small

Answer 2

mutual flux is small

Question 3

A square loop of wire lies in the plane of the page. A decreasing magnetic field is directed into the page. The induced current in the loop is:
A. zero
B. up to the left edge and from right to left along the top edge
C. clockwise
D. counterclockwise

Answer 3

clockwise

Question 4

Which of the following will you connect to make a galvanometer into an ammeter?
A. a low resistance in parallel
B. a high resistance in parallel
C. a low resistance in series
D. a high resistance in series

Answer 4

a low resistance in parallel

Question 5

Nine identical wires, each of diameter d and length L, are connected in parallel. The combination has the same resistance as a single similar wire of length L but whose diameter is:
A. d/3
B. d/9
C. 3d
D. 9d

Answer 5

3d

Question 6

The following are type of AC motor staters except one
A. Reactance starter
B. Wye - delta starter
C. Capacitance starter
D. Across the line starter

Answer 6

Across the line starter

Question 7

The relay that is used to prevent motorizing of a generator is a
A. series power relay
B. forward power relay
C. shunt power relay
D. reverse power relay

Answer 7

reverse power relay

Question 8

The coulomb force F, acts on two charges a distance, r, apart. What is F proportional to?
A. 1/r^3
B. r
C. 1/r^2
D. r^2

Answer 8

1/r^2

Question 9

Positive charge is distributed uniformly throughout a non-conducting sphere. The highest electric potential occurs
A. at the surface
B. far from the sphere
C. just outside the surface
D. at the center

Answer 9

at the center

Question 10

By increasing the transmission voltage double of its original value, the same power can be dispatch keeping the line loss
A. Double the original value
B. Half of the original value
C. Equal to its original value
D. One-fourth the original value

Answer 10

One-fourth the original value

Question 11

The specific resistance ρ depends upon
A. The area of cross-section and the length of the conductor
B. The nature of the material of the conductor only
C. The material of the conductor, its area of cross-section and length
D. The area of cross-section of the conductor

Answer 11

The nature of the material of the conductor only

Question 12

In a DC motor, what is the definition of “field resistance”?
A. It is load resistance seen by a generator without considering inductance.
B. It is the resistance of the armature windings plus the load resistance.
C. It is the resistance of the excitation circuit.
D. It is the static resistance of the motor.

Answer 12

It is the resistance of the excitation circuit.

Question 13

The electrical analog of a spring constant k is:
A. L
B. 1/C
C. C
D. 1/L

Answer 13

1/C

Question 14

Which of the following protective device operates on the principle of Kirchhoff’s Current Law?
A. Differential Protective Relay
B. Instantaneous Overcurrent Relay
C. AC Time Overcurrent Relay
D. Undercurrent Relay

Answer 14

Differential Protective Relay

Question 15

1 weber is the same as:
A. 1 T/m
B. 1 V · s
C. 1 T · s
D. 1 V/s

Answer 15

1 V · s

Question 16

In a transmission line of negligible resistance, the surge impedance will be
A. square root of 1/LC
B. square root of C/L
C. square root of LC
D. square root of L/C

Answer 16

square root of L/C

Question 17

In the context of the loop and junctions rules for electrical circuits a junction is:
A. where only two wires are joined
B. where three or more wires are joined
C. where a wire is connected to a resistor
D. where a wire is connected to a battery

Answer 17

where three or more wires are joined

Question 18

For two alternators operating in parallel, if the load shared by one of them is to be increased, its field excitation is
A. to be kept constant but input torque should be decreased
B. to be weakened keeping input torque the same
C. to be kept constant but input torque should be increased
D. to be strengthened keeping input torque the same

Answer 18

to be kept constant but input torque should be increased

Question 19

A charged capacitor and an inductor are connected in series. At time t = 0 the current is zero, but the capacitor is charged. If T is the period of the resulting oscillations, the next time after t = 0 that the charge on the capacitor is a maximum is:
A. T/2
B. T/4
C. 2T
D. T

Answer 19

T/2

Question 20

Which of the following that uses water power is a limited storage power plant?
A. Run-of-River (ROR)
B. Pumped Storage
C. Ocean power
D. Tidal power plant

Answer 20

Pumped Storage

Question 21

A charged capacitor is being discharged through a resistor. At the end of one time constant the charge has been reduced by (1-1/e) = 63% of its initial value. At the end of two time constants the charge has been reduced by what percent of its initial value?
A. 100%
B. 82%
C. 86%
D. Between 90% and 100%

Answer 21

86%

Question 22

Which of the following will the effect of the electric shock in the human body depend on?
A. resistance of the line
B. current flowing in the body
C. line power
D. voltage flowing in the body

Answer 22

current flowing in the body

Question 23

What is the purpose of reactor in short circuit?
A. to increase the current in short circuit
B. to lessen the current in short circuit
C. to open the line in short circuit
D. to decrease the circuit resistance

Answer 23

To lessen the current in short circuit

Question 24

Which is not a standard distribution voltage in the Philippines?
A. 34.5 kV
B. 13.2 kV
C. 69 kV
D. 13.8 kV

Answer 24

69 kV

Question 25

What is the instrument often used to check the degree of motor shaft misalignment? A. Voltmeter B. Dial Indicator C. Megaohmmeter D. Clamp-on Ammeter

Answer 25

Dial Indicator

Question 26

In sockets, extension cords are protected by means of _________ knot. A. Clove hitch B. Sheep shank C. Western union D. Underwriters'

Answer 26

Underwriters'

Question 27

Which of the following shall NOT be excluded in the calculation of reliability standard indices of the distributor asset by the Philippine Distribution Code? A. Outages that occur on the secondary lines of the distribution system B. Outages that occur in the transmission line. C. Outages that occur on the primary lines of the distribution system D. Planned outages where the customers have been notified at least three (3) days prior to the loss of power.

Answer 27

Outages that occur on the primary lines of the distribution system

Question 28

The impedance of an RLC series circuit is definitely increased if: A. R increases B. L decreases C. L increases D. C decreases

Answer 28

R increases

Question 29

If the per unit impedance is x pu, what is the new per unit impedance when both base power and voltage are doubled A. 4x B. x C. 2x D. 0.5x

Answer 29

0.5x

Question 30

Which of the following AC device is used to measure the angle between the voltage and its current? A. power factor meter B. reactive meter C. demand meter D. phase angle meter

Answer 30

phase angle meter

Question 31

A current is clockwise around the outside edge of this page and a uniform magnetic field is directed parallel to the page, from left to right. If the magnetic force is the only force acting on the page, the page will turn so the right edge: A. moves to your right B. moves away from you C. moves to your left D. moves toward you

Answer 31

moves toward you

Question 32

The process of heating electrically non-metallic elements such as plumbers, plastics etc. A. capacitive B. induction C. resistive D. dielectric

Answer 32

dielectric

Question 33

An ACSR conductor has (n – 1) layers around its single center strand, the total number of strands will be A. 3n^2 – 3n + 1 B. 3n^2 – 3n - 1 C. 3n^2 + 3n - 1 D. 3n^2 + 3n + 1

Answer 33

3n^2 – 3n + 1

Question 34

If a circuit has L closed loops, B branches, and J junctions the number of independent loop equations is: A. B - J + 1 B. B C. L D. B - J

Answer 34

B − J + 1

Question 35

A car battery is rated at 80 ampere-hour. An ampere-hour is a unit of A. energy B. current C. charge D. power

Answer 35

charge

Question 36

The unit of magnetic dipole moment is A. Amp-m B. Amp-m^2 C. Amp/m D. Amp/m^2

Answer 36

Amp-m^2

Question 37

The tesla is a unit of _________. A. inductance B. capacitance C. magnetic flux density D. permittivity

Answer 37

magnetic flux density

Question 38

It is defined as the total number of sustained Customer power Interruptions within a given period divided by the total number of Customers served within the same period. A. Customer Average Interruption Frequency Index B. Customer Average Interruption Duration Index C. System Average Interruption Frequency Index D. System Average Interruption Duration Index

Answer 38

System Average Interruption Frequency Index

Question 39

If the magnetic flux through a certain region is changing with time ____________________, A. a magnetic field must exist at the boundary B. an emf must exist around the boundary C. a current must flow around the boundary D. an electric field must exist at the boundary

Answer 39

an emf must exist around the boundary

Question 40

A wattmeter method which is suitable to use for unbalanced load is A. 2-wattmeter method B. 1-wattmeter method C. 4-wattmeter method D. 5-wattmeter method

Answer 40

2-wattmeter method

Question 41

Which of the following is not included in a basic communication circuit? A. receiver B. communication channel C. antenna D. transmitter

Answer 41

antenna

Question 42

Resistor 1 has twice the resistance of resistor 2. The two are connected in parallel and a potential difference is maintained across the combination. The rate of thermal energy generation in 1 is: A. four times that in 2 B. half that in 2 C. the same as that in 2 D. twice that in 2

Answer 42

half that in 2

Question 43

Faraday’s law states that an induced emf is proportional to: A. the rate of change of the electric flux B. the rate of change of the magnetic flux C. the rate of change of the electric field D. the rate of change of the magnetic field

Answer 43

the rate of change of the magnetic flux

Question 44

Power lost due to alternating magnetization and demagnetization of the core material A. copper loss B. eddy current loss C. rheostat loss D. hysteresis loss

Answer 44

hysteresis loss

Question 45

The rapid exponential decay in just a few cycles of the charge on the plates of capacitor in an RLC circuit might be due to: A. a large capacitance B. a large resistance C. a large inductance D. a small capacitance

Answer 45

a large resistance

Question 46

When the current and voltage are out of phase by 90 degrees, the power is A. average B. zero C. minimum D. maximum

Answer 46

zero

Question 47

An unconventional conductor consists of three strands arranged vertically. Find the GMR in terms of radius r of and individual strand. A. 1.564r B. 1.864r C. 1.764r D. 1.704r

Answer 47

1.704r

Question 48

A step-down transformer is used to A. decrease the voltage B. increase the voltage C. decrease the power D. increase the power

Answer 48

decrease the voltage

Question 49

Which of the following is NOT a property of magnetic field lines? A. The field is stronger where the lines are closer together. B. The lines intersect surface of equal intensity at right angles. C. The lines cross themselves only at right angles. D. Magnetic field lines have no beginning and no ends.

Answer 49

The lines cross themselves only at right angles.

Question 50

The resistance of resistor 1 is twice the resistance of resistor 2. The two are connected in parallel and a potential difference is maintained across the combination. Then: A. the current in 1 is twice that in 2 B. the potential difference across 1 is half that across 2 C. the current in 1 is half that in 2 D. the potential difference across 1 is twice that across 2

Answer 50

the current in 1 is half that in 2

Question 51

What is the resistance of an open fuse circuit? A. 100 ohms standard temperature B. zero C. at least 1000 ohms D. infinity

Answer 51

infinity

Question 52

The emf of a battery is equal to its terminal potential difference: A. only when there is no current in the battery B. only when a large current is in the battery C. under all conditions D. only when the battery is being charged

Answer 52

only when there is no current in the battery

Question 53

The current density is the same on two wires. Wire A has twice the free-electron concentrated of wire B. The drift speed of electron in a is: A. Four time the of electrons in B B. One-fourth that of electron in B C. Half that of electrons in B D. Twice that of electron in B

Answer 53

Half that of electrons in B

Question 54

Radio receivers are usually tuned by adjusting the capacitor of an LC circuit. If C = C1 for a frequency of 600 kHz, then for a frequency of 1200 kHz one must adjust C to: A. 4C1 B. C1/2 C. 2C1 D. C1/4

Answer 54

C1/4

Question 55

The winding of power transformer usually develops short circuit on account of A. impulse voltage B. loose connection C. mechanical vibration D. insulation failure

Answer 55

impulse voltage

Question 56

The magnetic torque exerted on a flat current-carrying loop of wire by a uniform magnetic field B is A. maximum when the plane of the loop is parallel to B B. independent of the orientation of the loop C. dependent on the shape of the loop for a fixed loop area D. maximum when the plane of the loop is perpendicular to B

Answer 56

maximum when the plane of the loop is parallel to B

Question 57

What can usually be assumed as the driving or source voltage for fault and voltage calculations in per unit method? A. 1 p.u. B. 3 p.u. C. 10 p.u. D. 5 p.u.

Answer 57

1 p.u.

Question 58

What is the maximum number of quarter bends permitted in rigid metal conduits between outlets? A. 3 B. 5 C. 2 D. 4

Answer 58

4

Question 59

If a tropical storm is going to the Philippine Area of Responsibility (PAR) within 24 hours what type of alert is to be raised in accordance to the Philippine Grid Code? A. blue alert B. red alert C. Yellow alert D. orange alert

Answer 59

blue alert

Question 60

An initially uncharged capacitor C is connected in series with resistor R. This combination is then connected to a battery of emf V0. Sufficient time elapses so that a steady state is reached. Which of the following statements is NOT true? A. The total thermal energy generated by R is independent of V0 B. The total thermal energy generated by R is independent of R C. The final charge on C is independent of R D. The time constant is independent of V0

Answer 60

The total thermal energy generated by R is independent of R

Question 61

A dc series motor connected to alternating current power supply. What will happen? A. Run on the same efficiency B. Will not burn C. Run but with less efficiency D. Will get burn

Answer 61

Run but with less efficiency

Question 62

The power factor of incandescent bulb is A. 0.8 lagging B. zero C. unity D. 0.8 leading

Answer 62

unity

Question 63

Series capacitors are used to compensate for A. Improve the line voltage B. None of these C. Compensate for line inductive reactance D. Compensate for line capacitive reactance

Answer 63

Compensate for line inductive reactance

Question 64

In a purely inductive circuit, the current lags the voltage by: A. one-half of a cycle B. one-fourth of a cycle C. zero D. three-fourths of a cycle

Answer 64

one-fourth of a cycle

Question 65

The diversity factor is defined as the A. Average demand over maximum demand B. Maximum demand over sum of consumer’s maximum demand C. Average demand over maximum load on the station D. Sum of consumers maximum demand over maximum load on the station

Answer 65

Sum of consumers maximum demand over maximum load on the station

Question 66

Root-mean-square is also called the _______ voltage. A. maximum B. average C. effective D. peak

Answer 66

effective

Question 67

The current is zero in a conductor when NO potential difference is applied because A. the electrons are not moving B. the electrons are not moving fast enough C. equal numbers of electrons and protons are moving together D. for every electron with a given velocity there is another with a velocity of equal magnitude and opposite direction

Answer 67

for every electron with a given velocity there is another with a velocity of equal magnitude and opposite direction

Question 68

A conductor has four identical strands arranged in diamond configuration. Find the GMR of the conductor in terms of the radius r of each strand. A. 1.6921r B. 1.7037r C. 1.3052r D. 1.3008r

Answer 68

1.6921r

Question 69

What is/are the main reason/s for using high voltage in the transmission of power in the grid system? I. to transmit bulk power with minimum line losses II. Increase system reliability A. I only B. either I or II C. II only D. both I and II

Answer 69

I only

Question 70

The units of motional emf are: A. tesla·meter^2/second B. volt/second C. volt/tesla D. volt·meter/second

Answer 70

tesla·meter^2/second