Which of the following load normally, needs starting torque more than. The rated torque? Mark as favorite Copy Link Blowers Conveyors Air compressors Centrifugal pumps Check Answer
In DC. motor which of the following can sustain the maximum temperature rise? Mark as favorite Copy Link Slip rings Commutator Field winding Armature winding Check Answer
Which of the following, in a D.C. motor, can sustain the maximum temperature rise? Mark as favorite Copy Link Commutator armature windings Slip rings Field windings Check Answer
Buses, trains, trolleys, hoists, cranes require high starting torque and therefore make use of? Mark as favorite Copy Link D.C. series motor D.C. shunt motor induction motor all of above motors Check Answer
The rated speed of a given D.C. shunt motor is 900 r.p.m. To run this machine at 1000 r.p.m., which of the following speed control scheme will be used? Mark as favorite Copy Link Ward-Leonard control Armature current resistance control Field resistance control None of the above Check Answer
Which of the following method of speed control of D.C. machine will offer minimum efficiency? Mark as favorite Copy Link Voltage control method Field control method Armature control method All above methods Check Answer
ln case the back e.m.f and the speed of a dc motor are doubled, the torque developed by the motor will? Mark as favorite Copy Link remain unchanged reduce to one-fourth value increase four folds be doubled Check Answer
Which of the fol1owing motors one will choose to drive the rotary compressor? Mark as favorite Copy Link D.C. shunt motor D.C. series motor Universal motor Synchronous motor Check Answer
Which of the following motors is usually used in house-hold refrigerators? Mark as favorite Copy Link D.C. shunt motor D.C. series motor Single phase induction motor (split phase start or induction run motor) Reluctance motor Check Answer
Torque developed by a D.C motor depends upon? Mark as favorite Copy Link magnetic field current flow through the conductors number of conductors all above factors Check Answer