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No-load speed of which of the following motor will be highest ?

No-load speed of which of the following motor will be highest ?


  1. Shunt motor
  2. Series motor
  3. Cumulative compound motor
  4. Differentiate compound motor
discuss
The direction of rotation of a D.C. series motor can be changed by

The direction of rotation of a D.C. series motor can be changed by


  1. interchanging supply terminals
  2. interchanging field terminals
  3. either of (a) and (b) above
  4. None of the above
discuss
Which of the following application requires high starting torque ?

Which of the following application requires high starting torque ?


  1. Lathe machine
  2. Centrifugal pump
  3. Locomotive
  4. Air blower
discuss
If a D.C. motor is to be selected for conveyors, which rriotor would be preferred ?

If a D.C. motor is to be selected for conveyors, which rriotor would be preferred ?


  1. Series motor
  2. Shunt motor
  3. Differentially compound motor
  4. Cumulative compound motor
discuss
Which D.C. motor will be preferred for machine tools ?

 Which D.C. motor will be preferred for machine tools ?


  1. Series motor
  2. Shunt motor
  3. Cumulative compound motor
  4. Differential compound motor
discuss
Differentially compound D.C. motors can find applicationsrequiring

Differentially compound D.C. motors can find applicationsrequiring


  1. high starting torque
  2. low starting torque
  3. variable speed
  4. frequent on-off cycles
discuss
Which D.C. motor is preferred for elevators ?

Which D.C. motor is preferred for elevators ?


  1. Shunt motor
  2. Series motor
  3. Differential compound motor
  4. Cumulative compound motor
discuss
If the field of a D.C. shunt motor gets opened while motor is running

If the field of a D.C. shunt motor gets opened while motor is running


  1. the speed of motor will be reduced %
  2. the armature current will reduce
  3. the motor will attain dangerously high speed 1
  4. the motor will continue to nuvat constantspeed
discuss
Starters are used with D.C. motors because

Starters are used with D.C. motors because


  1. these motors have high starting torque
  2. these motors are not self-starting
  3. back e.m.f. of these motors is zero initially
  4. to restrict armature current as there is no back e.m.f. whilestarting
discuss
In D.C. shunt motors as load is reduced

In D.C. shunt motors as load is reduced


  1. the speed will increase abruptly
  2. the speed will increase in proportion to reduction in load
  3. the speed will remain almost/constant
  4. the speed will reduce
discuss
A D.C. series motor is that which

A D.C. series motor is that which


  1. has its field winding consisting of thick wire and lessturns
  2. has a poor torque
  3. can be started easily without load
  4. has almost constant speed
discuss
For starting a D.C. motor a starter is required because

For starting a D.C. motor a starter is required because


  1. it limits the speed of the motor
  2. it limits the starting current to a safe value
  3. it starts the motor
  4. none of the above
discuss
The type of D.C. motor used for shears and punches is

The type of D.C. motor used for shears and punches is


  1. shunt motor
  2. series motor
  3. differential compoutid D.C. motor
  4. cumulative compound D.C. motor
discuss
If a D.C. motor is connected across the A.C. supply it will

If a D.C. motor is connected across the A.C. supply it will


  1. run at normal speed
  2. not run
  3. run at lower speed
  4. burn due to heat produced in the field winding by .eddy currents
discuss
To get the speed of D.C, motor below the normal without wastage of electrical energy isused

To get the speed of D.C, motor below the normal without wastage of electrical energy isused.


  1. Ward Leonard control
  2. rheostatic control
  3. any of the above method
  4. none of the above method
discuss
When two D.C. series motors are connected in parallel, the resultant speed is

When two D.C. series motors are connected in parallel, the resultant speed is


  1. more than the normal speed
  2. loss than the normal speed
  3. normal speed
  4. zero
discuss
The speed of a D.C. shunt motor more than its full-load speed can be obtained by

The speed of a D.C. shunt motor more than its full-load speed can be obtained by


  1. decreasing the field current
  2. increasing the field current
  3. decreasing the armature current
  4. increasing the armature current
discuss
In a D.C. shunt motor, speed is

In a D.C. shunt motor, speed is


  1. independent of armature current
  2. directly proportional to the armature current
  3. proportional to the square of the current
  4. inversely proportional to the armature current
discuss
What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?

What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?


  1. The motor will stop
  2. The motor will continue to run
  3. The armature may burn
  4. The motor will run noisy
discuss
A direct on line starter is used: for starting motors

A direct on line starter is used: for starting motors


  1. iip to 5 H.P.
  2. up to 10 H.P.
  3. up to 15 H.P.
  4. up to 20 H.P
discuss
total MCQs: 118

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