1. Which of the following· capacitor is preferred in case of single phase motor ?

Mica capacitor

Paper capacitor

Electrolytic capacitor

Ceramic capacitor

Answer: Electrolytic capacitor

Explanation:


2. Mica capacitors are characterised by all of the following except ?

stable operation

accurate value

low leakage reactance

low losses

Answer: low leakage reactance

Explanation:


3. In order to remove static electricity from machinery ?

construct insulated cabins

insulate the machinery

ground the framework

humidify the surroundings

Answer: ground the framework

Explanation:


4. Which of the following medium will have highest value of relative permittivity ?

Water

Glass

Mica

Paper

Answer: Water

Explanation:


5. Dielectric strength of medium ?

increases with rise in temperature

increases with moisture content

is same for all insulating materials

none of the above

Answer: none of the above

Explanation:


6. ln a cable capacitor, voltage gradient is maximum at the surface of the ?

earth

conduction

sheath

insulator

Answer: conduction

Explanation:


7. Internal heating of a capacitor is usually attributed to ?

electron movement

leakage resistance

dielectric charge

plate vibration

Answer: leakage resistance

Explanation:


8. The presence of an uncharged conductor near a charged one increases the ?

charge of the charged conductor

capacity of the charged conductor

potential of the charged conductor

all of the above

Answer: capacity of the charged conductor

Explanation:


9. Electric displacement is a ...... quantity ?

scalar

vector

both of the above

none of the above

Answer: vector

Explanation:


10. The electrons, in a dielectric, get detached from the atoms under ?

high current

high voltage

variable current

breakdown

Answer: breakdown

Explanation: