TS Mocktest 2021-6

1. In a synchronous motor, if V is the applied voltage and E is the back emf then the motor is said to be overexcited if

A. E = V
B. E ≤ V
C. E >= V
D. E > V

Answer : E > V
Explanation:-

2. Which of the following motors is generally used for Vacuum cleaners

A. Universal motor
B. Hysteresis motor
C. Shaded pole motor
D. Reluctance motor

Answer : Universal motor
Explanation:- Universal motor have high starting torque,high speed, and lightweight. Due to these advantages Universal motor is used in vacuum cleaners

3. For low values of slip the Torque/Slip characteristic of an Induction motor is

A. straight line
B. Parabola
C. Hyperbola
D. Rectangular Hyperbola

Answer : straight line
Explanation:-

4. In hydro power plants water hammer occurs in

A. surge tank
B. penstock
C. turbine casing
D. draft tube

Answer : penstock
Explanation:-

5. The maximum demand of a consumer is 2kW and his daily energy consumption is 24kWh then the load factor of the consumer is

A. 25%
B. 50%
C. 75%
D. 90%

Answer : 50%
Explanation:- Maximum demand of energy in a day is 2Kw*24=48 KWH
consumer consumption units is 24 KWH
Load factor=(Units consumed)/(Maximum demand)=24/48=0.5=50%

6. In which part of a Thermal power plant, the steam pressure is less than that of atmosphere

A. Boiler
B. Turbine
C. Superheater
D. Condenser

Answer : Condenser
Explanation:-

7. Graphite is used in Nuclear power plant as a

A. Fuel
B. Coolant
C. Moderator
D. Electrode

Answer : Moderator
Explanation:-

8. Power factor of industrial loads is generally

A. Unity
B. Leading
C. Lagging
D. Zero

Answer : Lagging
Explanation:-

9. Distance relays are preferred for protection of

A. Transmission lines
B. Generators
C. Motors
D. Transformers

Answer : Transmission lines
Explanation:-

10. The buchholtz relay is normally recommended with the following rating of a transformer for protection

A. 50 KVA
B. 100KVA
C. 25 KVA
D. 750 KVA and above

Answer : 750 KVA and above
Explanation:-