TS ECET EEE 2016-2

1. Double cage induction motor, over an ordinary squirrel cage induction motor has the advantage of

A. Larger slip
B. Higher efficiency
C. Higher power factor
D. Reduced starting current

Answer : Reduced starting current
Explain:-

2. A 12 pole 3 phase star connected induction motor runs at 600 V, 50Hz. It has a rotor resistance of 0.03 ohm/phase and standstill reactance of 0.5 ohm/phase. The slip corresponding to maximum torque under running conditions is

A. 2%
B. 4%
C. 6%
D. 1%

Answer : 6%
Explain:-

3. When the supply voltage to an induction motor is reduced by 10%, the maximum torque will decrease by approximately

A. 5%
B. 10%
C. 20%
D. 40%

Answer : 20%
Explain:-

4. The capacitor start, capacitor run single phase Induction motor has

A. No centrifugal switch
B. Lower power factor
C. Noisy Operation
D. low efficiency

Answer : No centrifugal switch
Explain:-

5. The torque speed characteristic of a repulsion motor resembles torque-speed characteristics of _______ dc motor

A. seperately excited
B. shunt
C. series
D. compound

Answer : series
Explain:-

6. Single phase shaded pole motor has

A. squirrel cage rotor
B. wound rotor
C. High power factor
D. High starting torque

Answer : squirrel cage rotor
Explain:-

7. Unbalanced supply voltage given to a 3 phase delta connected induction motor will cause

A. zero sequence currents
B. less heating of the motor
C. negative sequence component current
D. Balanced currents

Answer : negative sequence component current
Explain:-

8. Which of the following power plants has the least operating cost

A. Hydro
B. Thermal
C. Nuclear
D. Diesel

Answer : Hydro
Explain:-

9. In a Hydro plant, Water hammer is developed in

A. Surge tank
B. water turbine
C. penstock
D. draft tube

Answer : penstock
Explain:-

10. A Condenser in a steam power plant condenses steam coming out of

A. Turbine
B. Boiler
C. Economizer
D. Super-heater

Answer : Turbine
Explain:-