AP ECET EEE 2016-2

1. A 4 pole, 50 Hz, 3 phase induction motor is 3 running with a slip of 4%, the rotor induced voltage frequency is

A. 2 Hz
B. 2.5 Hz
C. 25 Hz
D. 50 Hz

Answer : 2 Hz
Explain:-

2.In an Induction motor if the flux density of rotor is reduced to half of its normal value,the torque will be

A. Remains unchanged
B. Increase four folds
C. Reduced to half
D. Reduced to one fourth.

Answer : Reduced to half
Explain:-

3. In a shaded pole motor, shading coils are used to

A. Reduce winding losses
B. Reduce friction losses
C. Produce rotating magnetic field
D. Protect against sparking

Answer : Produce rotating magnetic field
Explain:-

4. Which of the following motors uses a centrifugal switch.

A. Permanent capacitor motor
B. Reluctance motor
C. Hysteresis motor
D. Universal motor

Answer : Reluctance motor
Explain:-

5. To improve the efficiency of thermal power plant Is placed between boller and turbine

A. Ash handling plant
B. Air preheater
C. Economiser
D. Super heater

Answer : Super heater
Explain:-

6.A consumer has to pay lesser fixed charges in.

A. Flat rate tariff
B. Two part tariff
C. Maximum demand tariff
D. Minimum demand tariff.

Answer : Maximum demand tariff
Explain:-

7. The area under load curve gives.

A. Average demand
B. Energy consumed
C. Maximum demand
D. Peak load.

Answer : Energy consumed
Explain:-

8. The reserved generatin capacity available for service under emergency conditions which is not kept in operation but in working order.

A. Hot reserve
B. Cold reserve
C. Spinning reserve
D. Firm power.

Answer : Cold reservebr /> Explain:-

9. By the use of which of the following power factor cannot be improved.

A. Phase advancers
B. Synchronous compensator
C. Static capacitors
D. Shunt reactors.

Answer : Shunt reactors
Explain:-

10. In which of the following, a circuit breaker must be equipped for remote operation.

A. Time delay trip
B. Inverse time trip
C. Shunt trip
D. Series trip.

Answer : Shunt trip
Explain:-