Belted slip ring induction motor is almost invariably used for_________________?
Belted slip ring induction motor is almost invariably used for_________________? A. water pumpsB. jaw crushers C. centrifugal blowers D. none of the above
Belted slip ring induction motor is almost invariably used for_________________? A. water pumpsB. jaw crushers C. centrifugal blowers D. none of the above
The travelling speed of cranes varies from_________________? A. 20 to 30 m/s B. 10 to 15 m/s C. 5 to 10 m/sD. 1 to 2.5 m/s
The cost of an induction motor will increase as________________? A. horsepower rating increases but r.p.m. decreases B. horsepower rating decreases but r.p.m. increases C. horsepower rating and operating speed increases D. horsepower rating and operating speed decreases
While selecting motor for an air conditioner which of the following characteristics is of great importance ? A. Type of bearings B. Type of enclosureC. Noise D. Arrangement for power transmis¬sion E. None of the above
Which of the following alternatives will be cheaper ? A. A 100 H.P. AC. three phase motor B. Four motors of 25 H.P. each C. Five motors of 20 H.P. each D. Ten motors of 10 H.P. each
Which of the following motors has series characteristics ? A. Shaded pole motorB. Repulsion motor C. Capacitor start motor D. None of the above
For a D.C. shunt motor which of the following is incorrect ? A. Unsuitable for heavy duty starting B. Torque varies as armature current C. Torque-armature current is a straight line D. Torque is zero for zero armature current
Which of the following types of motor enclosure is safest ? A. Totally enclosedB. Totally enclosed fan cooled C. Open type D. Semi closed
The diameter of the rotor shaft for an electric motor depends on which of the following ? A. r.p.m. only B. Horse power onlyC. Horse power and r.p.m. D. Horse power, r.p.m. and power factor
In series motor which of the following methods can be used for changing the flux per pole ? A. Tapped field control B. Diverter field control C. Series-parallel controlD. Any of the above