The shaded pole motor is used for__________?
(A) high starting torque
(B) low starting torque
(C) medium starting torque
(D) very high starting torque
If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in_________?
(A) damage to the starting winding
(B) damage to the centrifugal switch
(C) overloading of running winding
(D) none of the above
Speed torque characteristic of a repulsion induction motor is similar to that of a D.C____________?
(A) shunt motor
(B) series motor
(C) compound motor
(D) separately excited motor
In split phase motor main winding is of _____________?
(A) thin wire placed at the top of the slots
(B) thin wire placed at the bottom of the slots
(C) thick wire placed at the bottom of the slots
(D) thick wire placed at the top of the” slots
In repulsion motor, maximum torque is developed when____________?
(A) brush axis is at 45° electrical to the field axis
(B) brush axis coincides with the field axis
(C) brush axis is at 90° electrical to the field axis
(D) none of the above
The rotor of a hysteresis motor is made of___________?
(A) aluminium
(B) cast iron
(C) chrome steel
(D) copper
Which of the following applications always have some load whenever switched on ?
(A) Vacuum cleaners
(B) Fan motors
(C) Pistol drills
(D) All of the above
Torque developed by a single phase induction motor at starting is_____________?
(A) pulsating
(B) uniform
(C) none of the above
(D) nil
The speed control of universal motor used for sewing machines is by____________?
(A) friction
(B) varying the resistance
(C) tapping the field
(D) centrifugal mechanism
Which of the following motors is used in tape-recorders ____________?
(A) Hysteresis motor
(B) Reluctance motor
(C) Capacitor-run motor
(D) Universal motor