ECET EEE 2012-3

1. A single phase winding in a single phase motor produces

A. an alternating magnetic field
B. a stationary magnetic field
C. a rotating magnetic field
D. a steady magnetic field

Answer : A. an alternating magnetic field
Explanation:-

2. Under no-load condition, power factor of an induction motor is about

A. 0.2 lag
B. 0.9 lag
C. unity
D. 0.5 lead

Answer : A. 0.2 lag
Explanation:-

3. Of all the plants, minimum quantity of fuel used is required in _____ plant

A. Diesel power
B. steam
C. Hydro-electric
D. Nuclear

Answer : D. Nuclear
Explanation:-

4. The overall efficiency of a thermal power station is

A. Efficiency of boiler x Efficiency of turbine x Efficiency of generator
B. Efficiency of boiler x Efficiency of generator
C. Efficiency of generator x Efficicency of turbine
D. Efficiency of turbine x Efficiency of boiler

Answer : A. Efficiency of boiler x Efficiency of turbine x Efficiency of generator
Explanation:-

5. The effect of water hammer can be minimised by using

A. Spill way
B. Anvil
C. Surge tank
D. Draft tube

Answer : C. Surge tank
Explanation:-

6. In a diesel power plant suspended impurities in the fuel are removed by

A. Cyclone seperators
B. Electrostatic seperators
C. Fabric filters
D. Strainer

Answer : D. Strainer
Explanation:-

7. The rupturing capacity of a circuit breaker is measured in

A. Ampere
B. Volt-amp
C. Watt
D. Volt

Answer : B. Volt-amp
Explanation:-

8. A circuit breaker is essentially

A. an arc extinguisher
B. a current interrupting device
C. a power factor correcting device
D. A device for neutralising the effect of transients

Answer : B. a current interrupting device
Explanation:-

9. Mho relay normally is used for protection of

A. Long transmission lines
B. Medium transmission lines
C. Short transmission lines
D. No length criterion

Answer : A. Long transmission lines
Explanation:-

10. The scheme adopted for bus-bar protection is

A. split phase protection
B. differential protection
C. over-current protection
D. reverse power protection

Answer : B. differential protection
Explanation:-