ELECTRICAL ENGINEERING MCQ_20

Q.311 To find the most accurate values for resistance and inductance of the transmission line
A. End condenser configuration is used
B. Pi configuration is used
C. T configuration is used
D. Distributed parameters configuration is used
Ans.: D

Q.312 Penalty factor in power system economical operation is measure of
A. Line loss
B. generator cost
C. Fuel cost
D. all are correct
Ans.: A

Q.313 Normally the angle of the transmission line is kept____ because of ___ reasons.
A. 45, transient stability
B. 90, steady state stability
C. 45, steady state
D. 90, transient stability
Ans.: A

Q.314 which of the following is the wrong statement in terms if Slack bus?
A. Voltage and angle is specified at the bus
B. it should be the largest generator bus in the system
C. It should be located at the centre of the area
D. It has finite reactive power generation capability
Ans.: D

Q.315 Differential Equation is required to be solved in…
A. economical operation of power system
B. Load flow studies
C. Stability studies
D. finding efficiency of a transmission line
Ans.: C

Q.316 Which power plant may take several days to start up and shut down?
A. Peak load
B. Base load
C. Solar power plant
D. none of the these
Ans.: B

Q.317 Fuel cell for power generation have drawback of.
A. Noise, pollution and maintenance problems
B. Very high development costs
C. low life span
D. Synchronization problems
Ans.: B

Q.318 In comparison to steam plant, the annual fixed cost of nuclear plant is
A. Quit high
B. Quit low
C. almost equal
D. can’t say
Ans.: A

Q.319 The area under the load duration curve represents.
A. average load of the system
B. base load of the system
C. Maximum demand of the power system
D. energy generated in the period considered
Ans.: D

Q.320 Which of the following is a reason to decouple AVR and LFC loops when there is a shortage of reactive power?
A. Change in voltage magnitude marginally affects real power
B. AVR loop response is slower than LFC loop
C. angle of the voltage is not considered
D. deference of error is the reason
Ans.: A

Q.321 For a given transformer volt/turn for primary and secondary winding is
A. depends on transformer design
B. different
C. same
D. depends on load
Ans.: C

Q.322 No load efficiency of transformer is ____ than full load efficiency.
A. Same
B. lesser
C. greater
D. depends on load
Ans.: B

Q.323 Speed of induction motor at rated torque is __ than at maximum torque.
A. greater
B. same
C. depends on load
D. lesser
Ans.: A
Q.324 The mechanical angle is ___ electrical angle.
A. always less
B. same
C. greater than or equal to
D. lesser than or equal to
Ans.: D

Q.325 Slip at maximum torque depends on
A. stator resistance
B. rotor resistance and reactance
C. stator reactance
D. load current
Ans.: B

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