A. open-circuit in the winding

B. short-circuit in the winding

D. none of the above

B. It can rotate in one direction only

C. It requires only one winding

D. It is self-starting

A. capacitor value hiving changed

B. none of the above

C. open circuiting of capacitor

A. Universal motor

B. Shaded pole motor

D. Split phase motor

A. a.c. electrolytic type

B. air capacitor

D. ceramic type

A. from shaded pole to main pole

C. either of the above depending on power factor

D. either of the above depending on voltage

B. 250 to 500 W

C. 200 to 250 W

D. 10 to 20 W

A. Its squirrel cage-rotor is of unsym-metrical magnetic construction in order to vary reluctance path between stator and rotor

B. It requires no D.C. field excitation for its operation

C. It is nothing else but a single-phase, salient pole synchronous-induction motor

B. prevent hunting in the motor

C. eliminate armature reaction

D. provide mechanical balance

A. 60

B. 30

C. 10

B. Capacitor start motor

C. Split phase motor

D. Shaded pole motor

A. soft and porous bearings

B. hard and annealed bearings

D. ball or roller bearings

B. unity power factor

C. 0.8 power factor lagging

D. 0.8 power factor leading

A. Split-phase motor

C. Shaped pole motor

D. Repulsion motor

A. Vacuum cleaners

B. Fan motors

C. All of the above

A. It accelerates from rest to full-speed almost instantaneously

B. It is extremely quiet in operation

D. Its high starting torque is due to its high rotor hysteresis loss

A. current in the starting winding lags the voltage

C. none of the above

D. current in the starting winding is in phase with voltage in running winding

A. friction

C. tapping the field

D. centrifugal mechanism

A. cast iron

B. aluminium

D. copper

A. None of these

B. Split motor

D. Reluctance motor

A. None of the above

B. Repulsion start induction run motor

C. Repulsion motor

A. Lifts and hoists

B. Electric shavers

C. Refrigerators

A. high starting torque

B. medium starting torque

D. very high starting torque

A. armature

B. field

C. rotor

A. inductor

B. resistor

D. capacitor

A. none of the above

B. overloading of running winding

D. damage to the centrifugal switch

B. is self-starting

C. is constant speed motor

D. needs no D.C. excitation

A. capacitor

B. commutator

D. centrifugal switch

A. Reversing, light start

B. Non-reversing, no-load start

D. Gradually varying load

A. 5 to 10 W

C. 10 to 30 W

D. 40 to 75 W

A. current drawn by the motor will be excessively high

C. motor will not come up to speed

D. motor will not carry the load

B. start and run slowly

C. start and then stop

D. start and run at rated speed

B. can be marketed internationally

C. runs at dangerously high speed on no-load

B. chains

C. belts

D. brakes

A. electromagnetic induction

C. eddy current loss

D. magnetisation of rotor

B. a multilayer fine gauge copper wire in parallel with running winding

C. none of the above

D. a single turn of heavy wire which is in parallel with running winding

A. Shaded pole motor

B. Capacitor run motor

D. Split phase motor

B. less air gap

C. less number of field turns

D. more number of armature turns

E. smaller brush width

A. it has almost non-destructible capacitor

C. it is quiet in operation

D. it is comparatively cheaper

A. circulators

C. toys

D. hair dryers

A. Reluctance motor

B. Hysteresis motor

D. Universal motor

A. none of the above

C. D.C. shunt motor

D. A.C. motor

B. primary winding surrounds the secondary winding

C. both are usual arrangements

D. none of the above

B. Reluctance motor

C. Universal motor

D. Capacitor-run motor

B. disconnect motor from supply and immediately reconnect it to supply with reversed connections of the main winding

C. reverse the direction of connections of the auxiliary winding and immediately connect it to supply

D. reverse the direction of connection of the auxiliary winding and after motor comes to rest then connect auxiliary winding to the supply

A. Shaded pole type motor

B. Capacitor start and run motor

C. Capacitor start motor

A. Universal motor

B. All single phase motors have zero starting torque

C. Repulsion motor

B. applying variable voltage by means of silicon controlled rectifier

C. applying variable voltage by means of variable auto-transformer

D. connecting rheostat in series

E. varying field flux with tapped field windings

A. Resistance start

B. Capacitor start capacitor run

D. Universal

A. solidly

B. through capacitors

C. through reactances