Quiz  /  Power Systems Gate & PSU MCQ Questions With Answers

  • 1. 
    The modern steam turbines are

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

  • 2. 
    The load current in short circuit calculation is neglected because 1. Short circuit current much larger than load currents 2. Short circuit current out of phase with load currents

  • 1 and 2
  • 1 or 2
  • 1 alone
  • 2 alone

  • 3. 
    A definite time relay is ___________ the amount of current:

  • Dependent on
  • Independent of

  • 4. 
    Transmission efficiency increases as

  • voltage and power factor both increase
  • voltage and power factor both decrease
  • voltage increases but power factor decreases
  • voltage decreases but power factor increases.

  • 5. 
    Which of these systems uses the 3 phase 4 wire system?

  • Primary distribution
  • Secondary distribution
  • Primary transmission.
  • Secondary transmission.

  • 6. 
    Skin effect depends on

  • size of the conductor
  • frequency of the current
  • resistivity of the conductor material
  • all of the above.

  • 7. 
    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

  • 8. 
    The effective resistance of a conductor will be the same as ohmic resistance when

  • current is in true sine wave form
  • voltage is low
  • power factor is unity
  • Current is uniformly distributed in the conductor cross-section.

  • 9. 
    The region where the electrons and holes diffused across the junction is called ________

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

  • 10. 
    The short circuit current of an alternator when short circuited on three phases will be

  • Zero as time goes to infinity
  • Maximum when time goes to infinity
  • Infinity when time goes to infinity
  • Small as time goes to infinity but not zero

  • 11. 
    Which country created wind mills?

  • Egypt
  • Mongolia
  • Iran
  • Japan

  • 12. 
    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

  • 13. 
    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

  • 14. 
    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

  • 15. 
    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

  • 16. 
    Use of high speed circuit breaker will actually increase the system stability.

  • False
  • True

  • 17. 
    “During the day, the air above the land heats up more quickly than the air over water”.

  • true
  • false

  • 18. 
    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
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