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Power Systems MCQ Electrical Engineering

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About Power Systems

Following are some of the multiple choice questions on the Power Systems with answers that will help the students in developing their knowledge.

Power Systems MCQ

1. How much wind power does India hold?

20,000 MW
12,000 MW
140,000 MW
5000 MW

2. The overall efficiency of thermal power plant is equal to

Rankine cycle efficiency
Carnot cycle efficiency
Regenerative cycle efficiency
Boiler efficiency x turbine efficiency x generator efficiency

3. Solar thermal power generation can be achieved by

using focusing collector or heliostates
using flat plate collectors
using a solar pond
any of the above system

4. At what range of speed is the electricity from the wind turbine is generated?

100 – 125 mph
450 – 650 mph
250 – 450 mph
30-35 mph

5. What should be the value of earthing resistance for large power stations?

1 Ω
0.5 Ω
2 Ω
5 Ω

6. When did the development of wind power in India began?

1965
1954
1990
1985

7. If the load current decreases then the power factor

Will also decrease
Will increase
Will remains unchanged
None of these

8. Power factor of a load can be improved by using

Static capacitors
Synchronous condenser
Phase advancer
All of the above

9. Which of the following is not the distribution system normally used

3 phase-4 wire
3 phase-3 wire
Single phase - 3 wire
Single phase -4 wire.

10. Which type of system is generally adopted for the generation and transmission of electrical power?

3 phase 4 wire
2 phase 3 wire
3 phase 3 wire
None of these

11. The steady state stability of the power system can be improved by

Increasing the number of parallel lines between the transmission points
Connecting capacitors in series with the line
Reducing the excitation of the machines
Both a and b

12. The stability of the power system is not affected by which among these?

Generator reactance
Line losses
Excitation of generators
All of these

13. Various power system faults in increasing order of severity are

LG,LL,LLG,LLLG
LLLG,LLG,LG,LL
LLG,LLLG,LL,LG
LL,LG,LLLG,LLG

14. What percentage of fault occurring in the power system is line to line fault

5 %
30 %
25 %
15 %

15. A ___ distribution system is more reliable than the distribution system.

parallel, radial
parallel, ring
radial, parallel
ring, parallel

16. The amount of energy available in the wind at any instant is proportional to ___ of the wind speed.

Square root power of two
Square root power of three
Square power
Cube power

17. What is the expression for fault current in line to line fault?

If = √3 * (Ea / Z1 + Z2)
If = 3 * (Ea / Z1 + Z2)
If = √3 * (Ea / Z1 + Z2 + Z0)
If = 3 * (Ea / Z1 + Z2 + Z05)

18. Winds having following speed are suitable to operate wind turbines.

5 – 25m/s
10 – 35m/s
20 – 45m/s
30 – 55m/s

19. The rated voltage of a 3 phase power system is given by

rms peak voltage
Peak phase voltage.
rms line to line voltage
Peak line to line voltage.

20. What are the terminal conditions in case of SLG fault, if the fault occurs in the phase A?

Vb = 0, Ia = 0, Ic = 0
Va = 0, Ib = 0, Ic = 0
Va = 0, Ia = 0, Ic = 0
Vb = 0, Ia = 0, Ib = 0

21. The generating voltage and frequency in India is about?

11 kV and 60 Hz
11 kV and 50 Hz
220 kV and 60 Hz
220 kV and 50 Hz

22. The advantage of neutral earthing is

Freedom from persistent arcing grounds
Over voltages due to lightning can be discharged to earth
Simplified design earth fault protection
All of the above

23. When a line-to-line fault occurs, the short circuit current of an alternator depends upon its

Sub transient reactance
Transient reactance
Synchronous reactance
Short circuit reactance

24. Base impedance of the power system is given as:

(Base kV)2/Base MVA
(Base kV)/Base MVA
Base MVA/(Base kV)2
None of these

25. If power factor is less than unity then it will result in

Large kVA rating of equipment
Greater conductor size
Large copper losses
All of the above

26. Which of the following type of reactors are popularly used in power systems?

Compensation reactors
Current limiting reactors
Suppression or Peterson reactors
All of these

27. While designing the distribution to locality of one lac population with medium dense load requirement, we can employ ___________

radial system
parallel system
ring main system
any of the mentioned

28. Skin effect is proportional to

diameter of conductor
(diameter of conductor)1/2
(diameter of conductor )2
none

29. What are the common assumptions made for the equal area criterion?

The transmission line and machine resistances are neglected
Rotor speed of the machine is constant
Mechanical input remains constant.
All of these

30. In India largest thermal power station is located at

Kota
Sarni
Chandrapur
Neyveli

31. . One would design the feeders of the transmission system based on its ____________

a) current capacity
b) voltage drop
c) operating voltage
d) all of the mentioned

32. The amount of photo generated current increases slightly with increase in _________

Temperature
Photons
Diode current
Shunt current

33. The load flow solution is always assured in case of:

Newton-Raphson method
Gauss method
Gauss-Seidel method
None of these methods guarantees

34. In a star connected system without neutral grounding, zero sequence currents are

Zero
Phaser sum of phase currents
Same as r.m.s. value of phase currents
Same as peak value of phase currents

35. When alternating current passes through a conductor

it remains uniformly distributed throughout the section of conductor
portion of conductor near the surface carries more current as compared to the core
portion of conductor near the surface carries less current as compared to the core
entire current passes through the core of the conductor.

36. Wind energy is harnessed as ______ energy with the help of windmill or turbine.

Mechanical
Solar
Electrical
Heat

37. A’ is an operator used to symmetrical component analysis

Which rotates the vector, it operates upon, through an angle 90° in the clockwise direction
Which rotates the vector, it operates upon, through an angle 120°, in the counter-clockwise direction
Which rotates the vector, it operates upon, through an angle 120°, in the clockwise direction
Which rotates the vector, it operates upon, through an angle 240°, in the clockwise direction

38. By using which component can the transient stability limit of a power system be improved?

Series resistance
Series capacitor
Series inductor
a. Shunt resistance

39. For the given distribution system the maximum voltage at the midpoint will be ________

155.6 V
311.12 V
622 V
220 V

40. In overhead transmission lines the effect of capacitance can be neglected when the length of line is less than

200 km
160 km
100 km
80 km.

41. Use of high speed circuit breaker will actually increase the system stability.

False
True

42. Which one of the following device is used for improving the power factor of the system:

Synchronous Phase Modifier
Shunt Reactor
Series Reactor
Asynchronous Generator

43. When a line to ground fault occurs,the current in faulted phase is 100 A.The zero sequence current in this case will be

0 A
33.3 A
66.6 A
100 A

44. For the single phase 2-wire system, the maximum voltage between the outer wires and earth is ______________

V/√2
√2V
V
2V

45. Which among the following quantities are specified at the generator bus?

P and Q
P and |V|
Q and |V|
P and δ

46. Which one of the following loads has the poorest power factor?

Electric fan Induction motor
Transformer
Induction motor
Induction furnace

47. Phase advancers are used to improve the power factor of

Induction motors
Induction generators
Synchronous motors
Synchronous generators

48. At what value of ‘δ’ the maximum power transfer takes place

90 degree
0 degree
45 degree
30 degree

49. Which among these is related to the critical clearing timeof a fault in a power system?

Transient stability limit
Steady state stability limit
Frequency limit
All of these

50. The Critical Clearance time of a fault in the power system is related to

Reactive power limit
Short Circuit limit
Steady state stability limit
Transient stability limit

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