Q.1
Which of the following statements regarding repulsion-start induction motor is incorrect ?
Q.2
The rotor of a hysteresis motor is made of
Q.3
In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will
Q.4
The motor used for the compressors is
Q.5
If a particular application needs high speed and high starting torque, then which of the following motor will bepreferred ?
Q.6
If starting winding of a single-phase induction motor is left in the circuit, it will
Q.7
The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it
Q.8
The speed/load characteristics of a universal motor is same as that of
Q.9
If the capacitor of a single-phase motor is short-circuited
Q.10
The repulsion start induction run motor is used because of
Q.11
Which of the following statements regarding hysteresis motor is in incorrect ?
Q.12
Which of the following single-phase motors has relatively poor starting torque ?
Q.13
In a universal motor, the most common cause of brush sparking is
Q.14
In repulsion motor direction of rotation of motor
Q.15
Which of the following motor will give the highest starting torque ?
Q.16
If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then
Q.17
In case of a shaded pole motor the direction of rotation of the motor is
Q.18
If a single phase induction motor runs slower than normal, the most likely defect is
Q.19
Centrifugal switch disconnects the auxiliary winding of the motor at about ____ percent of synchronous speed
Q.20
The wattage rating for a ceiling fan motor will be in the range
  • 200 to 250 W
  • 250 to 500 W
  • 50 to 150 W
  • 10 to 20 W
Q.21
In case of a shaded pole motor the direction of rotation of the motor is
  • from main pole to shaded pole
  • from shaded pole to main pole
  • either of the above depending on voltage
  • either of the above depending on power factor
Q.22
The repulsion-start induction-run motor is used because of
  • good power factor
  • high efficiency
  • minimum cost
  • high starting torque
Q.23
Which of the following motors has highest starting torque ?
  • Repulsion motor
  • Shaped pole motor
  • Capacitor-start motor
  • Split-phase motor
Q.24
In split-phase motor iauxiliary winding is of
  • thick wire placed at the bottom of the slots
  • thick wire placed at the top of the slots
  • thin wire placed at the top of the slots
  • thin wire placed at the bottom of the slots
Q.25
A universal motor can run on
  • only
  • only
  • either or
  • none of the above
Q.26
Which of the following motor will give the highest starting torque ?
  • shunt motor
  • Schrage motor
  • Repulsion start and induction run motor
  • Universal motor
Q.27
The direction of rotation of an hysteresis motor is determined by
  • interchanging the supply leads
  • position of shaded pole with respect to main pole
  • retentivity of the rotor material
  • none of these
Q.28
If the capacitor of a single-phase motor is short-circuited
  • the motor will not start
  • the motor will run
  • the motor will run in reverse direction
  • the motor will run in the same direction at reduced r.p.m.
Q.29
A centrifugal switch is used to dis- connect 'starting winding when motor has
  • run for about 1 minute
  • run for about 5 minutes
  • picked up about 50 to 70 per cent of rated speed
  • picked up about 10 to 25 per cent of rated speed
Q.30
If a particular application needs high speed and high starting torque, then which of thefollowing motor will be preferred ?
  • Universal motor
  • Shaded pole type motor
  • Capacitor start motor
  • Capacitor start and run motor
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