TS Mocktest 2021-9

1. A device which converts input power at one frequency to output power at a different frequency is called

A. Rectifier
B. Cycloconverter
C. Inverter
D. Chopper

Answer : Cycloconverter
Explanation:-

2. In DC choppers, If Ton is the on-period and f is the chopping frequency, then output voltage in terms of input voltage V, is given by

A. Vs (Ton/f)
B. Vs(f/Ton)
C. (Vs/f).Ton
D. Vs. f .Ton

Answer : Vs. f .Ton
Explanation:-

3. Stack pointer in 8051 micro controller is a/an

A. 8 bits
B. 16 bits
C. 32 bits
D. 64 bits

Answer : 8 bits
Explanation:-

4. The percentage efficiency of diesel locomotive is around

A. 70-80
B. 20 - 25
C. 50-60
D. 60-70

Answer : 20 - 25
Explanation:-

5. Which of the motor is best suited for traction?

A. DC shunt motor
B. Reluctance motor
C. Differential compound motor
D. DC series motor

Answer : DC series motor
Explanation:-

6. The supply frequency for 25 kV single phase system used in traction is

A. 50 Hz
B. 40 Hz
C. 60 Hz
D. 30 Hz

Answer : 50 Hz
Explanation:-

7. The co-efficient of adhesion value will be high when rails are

A. Cleaned with sand
B. Fog
C. Greased
D. Wet

Answer : Cleaned with sand
Explanation:-

8. The crest speed of train means

A. Minimum speed
B. Average speed
C. Maximum speed
D. Scheduled speed

Answer : Maximum speed
Explanation:-

9. In the electric passenger train the power for lighting is provided by

A. Rails
B. Individual generator of bogie and batteries
C. Locomotive
D. Overhead line

Answer : Individual generator of bogie and batteries
Explanation:-

10. What type of earthing is used in transmission lines?

A. Plate earthing
B. Rod earthing
C. wire earthing
D. Strip earthing

Answer : Strip earthing
Explanation:-