ELECTRICIAN IN ENGLISH Quiz – 798

By | September 26, 2020

Which of the following component is usually fabricated out of silicon steel ?
  
    Bearings
    Shaft
    Stator Core
    None of the above

Stator Core

The frame of an induction motor is usually made of
  
    cast iron
    bronze
    aluminium
    silicon steel

cast iron

In medium sized induction motors the slip is generally around
  
    0.04
    0.004
    0.0004
    0.14

0.04

Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor ?
  
    By injecting e.m.f. in the rotor circuit
    By changing the number of stator poles
    Rotor rheostat control
    By operating two motors in cascade

By changing the number of stator poles

In case of the induction motors the torque is
  
    directly proportional to slip
    inversely proportional to (Vslip)
    directly proportional to (slip)2
    inversely proportional to slip

directly proportional to slip

A double squirrel-cage induction motor has
  
    two series windings in stator
    two parallel windings in stator
    two rotors moving in oppsite direction
    two parallel windings in rotor

two parallel windings in rotor

When the equivalent circuit diagram of doouble squirrel-cage induction motor is constructed the two cages can be considered
  
    in series
    in series-parallel
    in parallel
    in parallel with stator

in parallel

Stepless speed control of induction motor is possible by which of the following methods ?
  
    Changing the number of poles
    None of the above
    Cascade operation
    E.M.F.  injection in rotor circuit

Changing the number of poles

The maximum torque in an induction motor depends on
  
    all of the above
    rotor inductive reactance
    frequency
    square of supply voltage

all of the above

The shaft of an induction motor is made of
  
    any of the above
    stiff
    flexible
    hollow

stiff


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