問題一覧
1
Base load plants are designed to supply power at ______.
High capital cost and low operating cost
2
The amplitude modulation generated at a very low voltage or power amplifier is _______modulation.
Low-level
3
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
4
Which of the following define the meaning of load factor?
The ratio of average load to maximum load.
5
If the magnetic flux through a certain region is changing with time ________.
A magnetic An emf exist around the boundary
6
In a capacitor start motor, the capacitor is replaced by an inductor having the same reactance as in capacitor. Then the motor will __________.
not start
7
The current is zero in a conductor when NO potential difference is applied because __________.
for every electron with a given velocity there is another with a velocity of equal magnitude and opposite direction
8
Which of the following transformer has only one winding?
Autotransformer
9
Which of the following AC device is used to measure the angle between the voltage and its current?
Phase angle meter
10
The grounded conductor is a/an ____________ grounded conductor.
intentionally
11
The resistance of a rod does NOT depend on _______.
the shape of its cross sectional area
12
A common utility's tariff practice to penalize industrial consumers whose power factor falls below __________ and give incentive for power factor above__________.
85%, 85%
13
One primary and one secondary terminal of two-winding transformer are connected to an ohm-meter instrument. What will be the be the reading on this instrument?
infinity
14
When the amplitude of the oscillator in a series RLC circuit is doubled the __________.
current amplitude is doubled
15
Which of the following protective device operates on the principle of Kirchhoff's Current Law?
Differential Protective Relay
16
Which of the following will the effect of the electric shock in the human body depend on?
Current flowing in the body
17
The coulomb force F, acts on two charges a distance, r, apart. What is F proportional to?
1/r^2
18
An LC series circuit with an inductance L and a capacitor C has an oscillation frequency of f. Two inductors, each with inductance L, and two capacitors, each with capacitance C, are all wired in series and the circuit is completed. The oscillation frequency is ______.
f
19
Which of the these is NOT a simplex type of electronic communication?
telephone
20
A good example of kinetic energy is provided by _______.
a tornado
21
Current gas units of ________.
Coulomb/second
22
The readings of the wateter will be the same in the two-wattmeter method when ________.
the power factor is unity
23
Modern locomotives are powered by DC motors driven by DC generators. Those are, in turn, driven by diesel engines. Which of the following is the reason for using such a configuration instead of AC generator-motor sets?
The DC configuration provides high torque and good incremental power at low speeds, and performs equally well at high speeds.
24
What is the main reason that alternating current replaced direct current for general used?
AC voltages conveniently transformed
25
The hazards exists only during the period of time the __________ is there.
fault
26
What can usually be assumed as the driving or source voltage for fault and voltage calculations in per unit method?
1 p.u.
27
Which of the following is NOT a reason why single-phase induction motor run?
Hysterisis
28
Which of the following is normally a controlled grounding path for current flow?
High impedance circuit
29
What is the function of the surge tank in the hydropower plant?
Relieve water hammer pressures in the penstock pipe
30
Which of the following is NOT a property of magnetic field lines?
The lines cross themselves only at right angles
31
Is a ground can be intentional or accidental? I. True II. False
I only
32
In an oscillating LC circuit, the total stored energy is U. The maximum energy stores in the capacitor during one cycle is __________.
U
33
What is the function of protective relays in the protection scheme?
Sensing device
34
What is the electrical analog of a spring constant “k”?
1/C
35
The starting/in rush current of the transformer is generally __________ times of its full load current.
10
36
Which of the following transformer’s winding connection is MOST suitable for an unbalanced load?
Four wye
37
Which of the following instrument is suited for high frequency measurements?
Thermocouple
38
Positive charge is distributed uniformly throughout a non-conducting sphere. The highest electric potential occurs __________.
at the center
39
Two wires of the same material have the same lengths but different diameters. They are connected in SERIES to a battery. Which of the following quantity is the same for the two wires?
Current
40
The tesla is a unit of _________.
Magnetic flux density
41
Which of the following limits the number of coils that may be placed on the armature of a DC motor or generator?
Coil to coil arcing due to the breakdown of insulation
42
What is the allowable rating for branch overload protection if fuse is used for a hermetic motor compressor with a rated load current of 37 A?
35A
43
Two 110-V light bulbs, one "25 W" and the other "100 W" are connected in series to a 10 V source. Then, which of the following statement is correct regarding to above sentence?
None of these
44
A parallel plate capacitor with plates of area A that are separated a distance d by air is initially charged with charge q. The energy stored in the capacitor initially is E. The plates are then separated by 2d. What is the new energy stored in the capacitor?
2E
45
The magnetic torque exerted on a flat current-carrying loop of wire by a uniform magnetic field B is __________.
Maximum when the plane of the loop is parallel to B
46
Two resistors are connected in parallel across a potential difference. The resistance of resistor A is twice that of resistor B. If the current carried by resistor A is I, then what is the current carried by B?
2I
47
Which of the following is/are the MOST important factor/s to be considered in the selection of fuel for power plants? I. Cost of fuel II. Calorific value of fuel
Both I and II
48
The government agency created under Presidential Degree 269, whose additional mandates includes preparing electric cooperatives in operating and competing under a deregulated electricity market.
National Electrification Administration
49
What is the term for a deadlock situation that occurs when a program references a difference page for almost every instruction and there is NOT even enough real memory to hold MOST of the virtual memory?
Thrashing
50
If the reference bus is changed in two load-flow runs with the same system data and power obtained for reference bus taken as specified P and Q in the latter run, _____.
The system losses will be unchanged but complex bus voltages will change
51
In subsequent iteration, a voltage-controlled bus is treated as a load bus when its _____.
Reactive power limit is violated
52
What is the equivalent IEEE device number for a differential protective relay?
87
53
What is the equivalent IEEE device number for a differential protective relay?
87
54
What is the equivalent IEEE device number for an undervoltage relay?
27
55
What is the equivalent IEEE device number for an instantaneous overcurrent relay?
50
56
What is the equivalent IEEE device number for an annuinciator relay?
30
57
Which of the following that the flourescent luminaires CANNOT be directly mounted?
framing members
58
Which of these can produce electricity?
Chemical
59
Feeders containing a common neutral are permitted to supply how many set of 3 wires?
2 or 3
60
How are transformers generally cooled for installations rated less than 5kVA?
Air cooled
61
What is the process of heating electrically non-metallic materials such as plumbers, plastics, etc.?
Dielectric
62
How are multiple stop push buttons connected in control circuit?
Series
63
The type of AC distribution system commonly used to supply both light and power is the?
3 phase wye system with neutral wire
64
Which of the following can produce negative half cycle?
Rectifier
65
The phenomenon of rise in voltage at the open circuited or slightly loaded line is called _________.
Ferranti effect
66
Each motor compressor shall have an overload protection set at not more than ___% of the motor compressor rated load current.
140
67
In a circuit breaker, the time duration from the instant of the fault to the extinction of the arc is known as ________.
total clearing time
68
As per RA 9136, a large customer has a demand of at least ___MW.
1
69
A permanent joining of metal parts to form an electrical conductive path that ensures electrical continuity and the capacity to conduct safety and current likely to be imposed on these metal parts.
bonding
70
The all-day efficiency of a transformer is also called its __________.
energy efficiency
71
The short circuit test helps us to find _______.
Cu loss
72
We can find of the transformer with open circuit test.
Core loss
73
A device that carry and interrupt load current even in case of a fault by used of separate contacts.
circuit breaker
74
A device that repeatedly reverses the polarity of a magnetic field in order to keep a dc motor rotating is known as ______.
a commutator
75
Efficiency of a power plant is more in summer or winters?
Depends on variation
76
One advantage of disturbing the winding in alternator is to __________.
reduce harmonics
77
The luminous intensity is defined as ______.
luminous flux per unit solid angle