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EE AND MATH OBJECTIVES > EE OBJECTIVES August 15, 2021 > Flashcards

EE OBJECTIVES August 15, 2021 Flashcards

1
Q
  1. Which of the following type of fault that used only the equivalent positive impedance of the circuit in the short-circuit calculation? *

Three-phase fault
Line-to-line fault
Double-line-to-ground fault
Single-line-to-ground fault

A

Three-phase fault

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2
Q
  1. Two 110-V light bulbs, one “25” and the other “100W”, are connected in series to a 110 V source. Then, which of the following statement is correct with regard to above sentence? *

None of these
the current in the 100-W bulb is less than that in the 25-W bulb.
Each bulb will have a potential difference of 55V.
The current in the 100-W bulb is greater than that in the 25-W bulb.

A

None of these

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3
Q
  1. A substance that changes its electrical resistance when illuminated by light is called : *

Photovoltaic.
Photoconductive.
Photoelectric.
None of these.

A

Photoconductive.

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4
Q
  1. What does PEMC in EPIRA stands for *

Philippine Energy Market Corporation
Philippine Electricity Market Corporation
Private Energy Marketing Company
Philippine Electrical Marketing Corporation

A

Philippine Electricity Market Corporation

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5
Q
  1. The size of conductor on EHV lines is obtained based on *

current density
corona
voltage drop
current density and voltage drop

A

corona

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6
Q
  1. Residual magnetism is necessary in a *

separately excited generator
self-excited generator
both of these
none of these

A

self-excited generator

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7
Q
  1. As load power factor of an alternator becomes more leading, the value of generated voltage required to give rated terminal voltage __________. *

increases
decreases
remains unchanged
varies with rotor speed

A

decreases

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8
Q
  1. What is the primary advantage of FM over AM? *

FM has a greater bandwidth than AM
more complex
noise immunity
greater capture effect

A

noise immunity

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9
Q
  1. What is the IEEE device function number 21? *

overvoltage relay
undervoltage relay
distance relay
differential relay

A

distance relay

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10
Q
  1. If an electrical network having one or more than one voltage source, is transformed into equivalent electrical network with a single current source (which is the short circuit current of previous circuit) with parallel internal resistance of the network with all current source replaced by their internal resistance, this is called: *

Thevenin’s Theorem
Reciprocity Theorem
Superposition Theorem
Norton’s Theorem

A

Norton’s Theorem

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11
Q
  1. The conduction of electricity across the surface of a dielectric is called _________________. *

skin effect
surface effect
crosstalk
creepage

A

creepage

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12
Q
  1. The amount of magnetizing force to counter balance the residual magnetism of a magnetic material is referred to as *

coercivity
reluctivity
susceptivity
retentivity

A

coercivity

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13
Q
  1. The transient current in a loss free LC circuit when excited from an ac source is a/an __________ sine wave. *

over-damped
under-damped
critically damped
undamped

A

undamped

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14
Q
  1. For power transformers, the conservator tank is intended to minimize *

breathing
oil sludging
heating
internal pressure

A

oil sludging

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15
Q 
47.	A pure semiconductor without doping is called *
Contaminated
Extrinsic
Doped
Intrinsic
A

Intrinsic

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16
Q 
48.	A coil that opposes any change in current flow is called a(n) \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_. *
transducer
capacitor
oscillator
inductor
A

inductor

17
Q
  1. If all other factors are held constant, the capacitance between a pair of parallel, flat, identical metal plates *
    does not change as the surface area of the plates increases.
    decreases as the surface area of the plates increases.
    depends on the voltage applied to the plates.
    increases as the surface area of the plates increases.
A

increases as the surface area of the plates increases.

18
Q 
52.	In resistance welding, the SCR is closed during \_\_\_\_\_\_\_\_\_\_ time. *
squeeze
hold
weld
squeeze, weld and hold
A

weld

19
Q 
57. The overcurrent protective device is caused to operate by \_\_\_\_\_\_\_\_\_\_. *
current flow
voltage surge
voltage drop
impedance
A

current flow

20
Q 
60. In a transformer, the resistance between the primary and secondary must be *
zero
1 kΩ
100 kΩ
infinite
A

infinite

21
Q 
. While describing the sheath of a cable, the abbreviation XLPE means \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_      polyethylene. *
cross-layer
cross-linked
external-layer
extra-long
A

cross-linked

22
Q 
When a current carrying conductor is brought into a magnetic field, the force that moves the conductor depends upon the \_\_\_\_\_\_\_\_\_\_. *
the direction of the conductor
the value of current
the weight of the conductor
none of these
A

the value of current

23
Q 
Which of the following types of heating process is used for surface hardening of the steel? *
induction
resistance
dielectric
infrared
A

resistance

24
Q 
An instrument having a voltage coil and a current coil would be a *
wheatstone bridge
voltmeter
wattmeter
ammeter
A

wattmeter

25
Q

The calculation of the reliability indices of the grid owners as set by Philippine Grid Code shall include outages that occur *
due to generation deficit
on the secondary line system
on the transmission line
on the primary lines of the distribution line

A

on the transmission line

26
Q

Two charged point particles are located at two vertices of an equilateral triangle and the electric field is zero at the third vertex. We conclude: *
the two particles have charges with opposite signs and the same magnitude
the two particles have charges with opposite signs and different magnitudes
the two particles have charges with the same sign but different magnitudes
at least one other charged particle is present

A

at least one other charged particle is present

27
Q

. Conduction electrons move to the right in a certain wire. This indicates that: *
the current density and electric field both point right
the current density points right and the electric field points left
the current density points left and the electric field points right
the current density and electric field both point left

A

the current density and electric field both point left

28
Q 
. Ohm’s law is not applicable to *
copper
silver
aluminum
silicon carbide
A

silicon carbide

29
Q 
A test used to determine the equivalent resistance of an induction motor is *
blocked rotor test
no-load test
short circuit test
polarity test
A

blocked rotor test

30
Q 
Power lost due to alternating magnetization and demagnetization of the core material *
copper loss
hysteresis loss
eddy current loss
rheostat loss
A

hysteresis loss

31
Q 
A transformer has negative voltage regulation when its power factor is *
zero
lagging
unity
leading
A

leading

32
Q 
For the two conductors inside the conduit, the ampacity of the conductors shall be derated to what percent? *
90%
70%
80%
none of these
A

none of these

33
Q 
A device or equipment which is suspended from overhead either by means of a flexible cord carrying the current, or otherwise. *
Rosette
Fixture
Air terminal
Pendant
A

Pendant

EE AND MATH OBJECTIVES (1 decks)

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