ELECTRICIAN IN ENGLISH Quiz – 882

By | October 6, 2020

In a A.C. series motor armature coils are usually connected to commutator
  
    through resistance
    solidly
    through capacitors
    through reactances

through resistance

In a capacitor start motor the phase displacement between starting and running winding can be nearly
  
    90°
    30°
    10°
    60°

90°

In a split phase motor the running winding should have
  
    low resistance as well as low inductance
    low resistance and high inductance
    high resistance and low inductance
    high resistance as well as high inductance

low resistance and high inductance

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.

the motor will not start

The rotor developed by a single-phase motor at starting is
  
    less than the rated torque
    rated torque
    more than i.he rated torque
    zero

zero

Which of the following motor will give relatively high starting torque ?
  
    Capacitor run motor
    Split phase motor
    Capacitor start motor
    Shaded pole motor

Capacitor start motor

In capacitor start single-phase motors
  
    current in the starting winding leads the voltage
    none of the above
    current in the starting winding is in phase with voltage in running winding
    current in the starting winding lags the voltage

current in the starting winding leads the voltage

In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to
  
    improve power factor
    reduce fluctuations in torque
    increase overload capacity
    to improve torque

improve power factor

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will
  
    start and run at rated speed
    not start at all
    start and then stop
    start and run slowly

not start at all

Which of the following motors is used in mixies ?
  
    Universal motor
    Repulsion motor
    Reluctance motor
    Hysteresis motor

Universal motor


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