ELECTRICIAN

ELECTRICIAN

Which of the following is not a part of the

Alternator's specification plate ?

(a) Voltage

(b) Phase

(c)KVA 

(d) Type of winding

Answer: (d) Type of winding

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A single phase Hysteresis motor can run at.......

(a) Synchronous speed only

(b) Sub synchronous speed only

(c) Synchronous and super synchronous speed

(d) Synchronous and sub synchronous speed

Answer: (a) Synchronous speed only

The direction of rotation of Hysteresis motor

 is reversed by............

(a) Reversing supply leads

(b) Shift shaded pole with respect to main pole

(c) Both (a) & (b)

(d) None of these

Answer: (b) Shift shaded pole with respect to main pole

The motor used in domestic mixer grinder is................

(a) DC motor

(b) Induction motor

(c) Universal motor

(d) Synchronous motor

Answer:  (c) Universal motor

A Stepper motor is a.....

(a) DC motor

 (b) Two phase motor

(c) Single phase motor

 (d) Multi phase motor

Answer:

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The slip ring induction motors have..............rotor.

(a) Phase wound

(b) Squirrel cage

(c) Squirrel cage with winding

(d) Diamond coil wound

Answer: (a) Phase wound

The difference between the speed of a rotating

magnetic field and the associated rotor is called .............

(a) Split

(b) Salient pole

(c) Slip

(d) Pul1 out tor(lue •

Answer: (c) Slip

If the voltage is reduced to half, the torque

developed by an induction motor will be

reduced to..................

(a) 1/4 of original torque

(b) 1/2 of original torque

(c) 1/8 of original torque

(d) 2/3 of original torque

Answer:

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In a three phase induction motor, the cage bars

of the rotor are arranged in an offset

pattern to the axis of rotation in order to prevent ...............

(a) Torque fluctuation

(b) Over heating

(c) Speed variation

(d) Voltage drop on load

Answer: (a) Torque fluctuation