___________________is preferred for synthetic fibre mills?
(A) Synchronous motor
(B) Reluctance motor
(C) Series motor
(D) Shunt motor
Which of the following motors is used for elevators ?
(A) Induction motor
(B) Synchronous motor
(C) Capacitor start single phase motor
(D) Any of the above
________________ motor is a constant speed motor?
(A) Synchronous motor
(B) Schrage motor
(C) Induction motor
(D) Universal motor
The starting torque of a D.C. motor is independent of which of the following?
(A) Flux
(B) Armature current
(C) Flux and armature current
(D) Speed
need frequent starting and stopping of electric motors ?
(A) Paper mills
(B) Grinding mills
(C) Air-conditioners
(D) Lifts and hoists
For which of the following applications D.C. motors are still preferred ?
(A) High efficiency operation
(B) Reversibility
(C) Variable speed drive
(D) High starting torque
Heat control switches are used in__________________?
(A) transformers
(B) cooling ranges
(C) three phase induction motors
(D) single phase
In jaw crushers a motor has to often start against ____________________ load?
(A) heavy
(B) medium
(C) normal
(D) low
Rotor of a motor is usually supported on ___________________ bearings?
(A) ball or roller
(B) needle
(C) bush
(D) thrust