1. The starting torque of a 1-phase induction motor is ?

High

Moderate

low

Zero

Answer: Zero

Explanation:


2. In a shaded pole single-phase motor, the revolving field is produced by the use of ?

inductor

capacitor

resistor

shading coils

Answer: shading coils

Explanation:


3. The repulsion-start induction-run motor is used because of ?

good power factor

high efficiency

minimum cost

high starting torque

Answer: high starting torque

Explanation:


4. The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it ?

improves the efficiency

helps the rotor teeth to remain under the stator teeth

helps in reducing the tendency of the rotor teeth to remain under the stator teeth

improves the power factor

Answer: helps in reducing the tendency of the rotor teeth to remain under the stator teeth

Explanation:


5. A shaded pole motor Can be used for ?

toys

hair dryers

circulators

any of the options

Answer: any of the options

Explanation:


6. The rotor of a hysteresis motor is made of ?

aluminium

cast iron

chrome steel

copper

Answer: chrome steel

Explanation:


7. The main advantage of AC transmission system over DC transmission system is ?

easy transformation

less losses in transmission over long distances

less insulation problems

less problem of instability

Answer: less losses in transmission over long distances

Explanation:


8. Next lower voltage line feeding areas on either side of the main transmission line is called ?

secondary distribution

secondary transmission

primary transmission

primary distribution

Answer: secondary transmission

Explanation:


9. The insulating material for cables should have ?

high dielectric strength

high mechanical strength

low cost

all options are correct

Answer: all options are correct

Explanation:


10. The main source of hydro-electric power station is ?

coal

generator

water

nuclear

Answer: water

Explanation: