Related Questions

Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors?
A Low cost
B Wide speed range
C Stability
D High starting torque
During braking, the brake shoe is moved outward to force the lining against the
A Wheel piston or cylinder
B Anchor pin
C Brake drum
D Wheel rim or axle
When the front wheels of a vehicle are locked during braking, then
A Stopping distance becomes extremely long
B Front tyres skid across the road surface, and the vehicle spins around
C Rear tyres skid across the road surface, and the vehicle spins around
D Driver loses control over the steering, and the vehicle continues moving in its current direction
Which of the following tests will be suitable for testing two similar D.C. series motors of large capacity?
A Swinburne's test
B Hopkinson's test
C Field test
D Brake test
In case of conductively compensated D.C. series motors, the compensating winding is provided
A As separately wound unit
B In parallel with armature winding
C In series with armature winding
D In parallel with field winding
When two D.C. series motors are connected in parallel, the resultant speed is
A More than the normal speed
B Loss than the normal speed
C Normal speed
D Zero
D.C. series motors are used
A Where load is constant
B Where load changes frequently
C Where constant operating speed is needed
D In none of the above situations
In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to
A improve power factor
B increase overload capacity
C reduce fluctuations in torque
D to improve torque
Which of the following motors has series characteristics?
A Shaded pole motor
B Repulsion motor
C Capacitor start motor
D None of the above
For which types of D.C. motor, dynamic braking is generally used?
A Shunt motors
B Series motors
C Compound motors
D All of the above

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