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. 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

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

  • 1965
  • 1954
  • 1990
  • 1985

3. List of parts of Power system.

  • Generation, transmission and distribution.
  • generation, transmission and transformer
  • generation, impedance and distribution.
  • Motor, transmission and distribution.

4. The main characteristics of electricity supply are as follows except:

  • Electricity cannot be stored in bulk form.
  • Increases in population, industrial expansion, housing areas and etc lead to the continuousincrease in demand for power.
  • Power station is located near to the resources location.
  • Synchronous Generator manufactured as 3-phase.

5. Which type of power station deliver full power continuously i.e. 24 hours a day and 365 days a year?

  • Base-power station
  • Intermediate-power station
  • Peak-power station
  • Continuously power station

6. Which source of power station suitable for Intermediate-power station?

  • Hydro
  • Coal
  • Nuclear
  • Wind

7. Select THREE types of substation normally used in power system. (Multiple Answer)

  • Transmission substation
  • Distribution substation
  • Interconnecting substation
  • Transformer substation

8. In distribution, power is distribute into consumer with certain level of voltage. State TWO voltage levels at final destination of distribution.

  • 415V 3phase
  • 240V 1phase
  • 240V 3phase
  • 415 1phase

9. Below is the advantages of grid systems in power system except:

  • Economy
  • Stability in operation
  • Service continuity
  • Increase Power Storage

10. In a transmission line system, the feeders act as input to _________

  • a) distributors
  • b) service mains
  • c) transformer sub stations
  • d) all of the mentioned

11. One needs to design the distributors, the parameter which will be considered for the design of it?

  • a) voltage drop in it
  • b) current flowing
  • c) operating voltage
  • d) operating frequency

12. . 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

13. Before installing any transmission system, one has to decide about the type of the transmission system to be employed. Considering a monetary shortage and economical setup, one would take up _____________

  • a) underground system
  • b) overhead system
  • c) underground or overhead system
  • d) can be chosen randomly.

14. The volume of copper required in a transmission system is proportional to _________

  • a) voltage and power factor
  • b) power factor
  • c) voltage
  • d) current

15. Solar cells are made from bulk materials that are cut into wafer of _________ thickness.

  • 120-180μm
  • 120-220μm
  • 180-220μm
  • 180-240μm

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

  • Temperature
  • Photons
  • Diode current
  • Shunt current

17. The current produce by the solar cell can be given by _________

  • IL – ID + ISh
  • IL + ID – ISh
  • IL + ID + ISh
  • IL – ID – ISh

18. The region where the electrons and holes diffused across the junction is called ________

  • Depletion Junction
  • Depletion region
  • Depletion space
  • Depletion boundary

19. When the source of light is not sun light then the photo voltaic cell is used as ____________

  • Photo diode
  • Photo voltaic cell
  • Photo detector
  • Photo transmitter

20. The term photo voltaic comes from ________

  • Spanish
  • Greek
  • German
  • English

21. 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.

22. What percentage of faults occurring is single line to ground fault?

  • 50 %
  • 60 %
  • 35 %
  • 70 %

23. 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

24. 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

25. Organic polymer solar cells are made from Polyphenylene.

  • true
  • false

26. __________ photo voltaic devices in the form of thin films.

  • Cadmium Telluroide
  • Cadmium oxide
  • Cadmium sulphide
  • Cadmium sulphate

27. __________ is one of the most important materials is also known as solar grade silicon.

  • Crushed silicon
  • Crystalline silicon
  • Powdered silicon
  • Silicon

28. The volt is the units of emf that was named after its inventor _________

  • Alessandro volta
  • Alxender volta
  • Alexa volta
  • Alexandro volta

29. What type of energy is wind energy?

  • Renewable energy
  • Non-renewable energy
  • Conventional energy
  • Commercial energy

30. “During the day, the air above the land heats up more quickly than the air over water”.

  • true
  • false

31. Which country created wind mills?

  • Egypt
  • Mongolia
  • Iran
  • Japan

32. What is the main source for the formation of wind?

  • Uneven land
  • Sun
  • Vegetation
  • Seasons

33. How much wind power does India hold?

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

34. How much is the energy available in the winds over the earth surface is estimated to be?

  • 2.9 X 120 MW
  • 1.6 X 107 MW
  • 1 MW
  • 5MW

35. In India largest thermal power station is located at

  • Kota
  • Sarni
  • Chandrapur
  • Neyveli

36. Which type of earthing is also called as ‘fire earthing’?

  • Plate earthing
  • Rod earthing
  • Strip earthing
  • All of these

37. What are the types of unsymmetrical faults?

  • Single line to ground fault
  • Double line to ground fault
  • Line to line fault
  • All of these

38. Positive, negative and zero sequence impedances of line are 2,2 and 5 pu respectively. Find self and mutual impedances respectively?

  • 1 and 3 pu
  • 3 and 1 pu
  • 2 and 2 pu
  • 2 and 5 pu

39. A transmission line has self and mutual impedances are 0.8 and 0 pu respectively. Find the positive, negative and zero sequence impedances respectively?

  • 0.6, 0.8 and 1.2 pu
  • 0.6, 0.6 and 1.2 pu
  • 0.6, 0.6 and 0.6 pu
  • 0.8, 0.8 and 0.8 pu

40. For symmetrical network, the neutral current is

  • zero
  • infinity
  • maximum
  • any of the above

41. The positive, negative and zero sequence impedances of a transmission line are 0.5,0.5 and 1.1 pu respectively. The self (Zs) and mutual (Zm) impedances of the line will be given by

  • Zs = 0.7 pu, Zm =0.2 pu
  • Zs = 0.5 pu, Zm =0.6 pu
  • Zs = 0.6 pu, Zm =0.5 pu
  • Zs = 0.2 pu, Zm =0.7 pu

42. If all the sequence voltages at the fault point in a power system are equal, then the fault point is a

  • LLL
  • LL
  • LG
  • LLG

43. The zero sequence current of a generator for line to ground fault is j3 pu. Then the current through the neutral during the fault is

  • j3 pu
  • j1 pu
  • j9 pu
  • j6 pu

44. Which of the following statement is/are true?Zn

  • The neutral grounding impedance Zn appears as 3Zn in zero sequence equivalent circuit
  • The neutral grounding impedance Zn appears as Zn in zero sequence equivalent circuit
  • both 1 and 2
  • nether 1 nor 2

45. Out of the following which one is not a unconventional source of energy ?

  • Tidal power
  • Geothermal energy
  • Nuclear energy
  • Wind power.

46. 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

47. The draught which a chimney produces is called

  • induced draught
  • natural draught
  • forced draught
  • balanced draught

48. Artificial draught is produced by

  • induced fan
  • forced fan
  • induced and forced fan

49. The modern steam turbines are

  • impulse turbines
  • reaction turbines
  • impulse-reaction turbines
  • none of the above

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

  • Mechanical
  • Solar
  • Electrical
  • Heat

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