ELECTRICIAN IN ENGLISH Quiz - 836


The plugging gives the
  
    none of the above
    highest torque braking
    zero torque braking
    smallest torque braking

highest torque braking

The direction of rotation of a D.C. series motor can be changed by
  
    interchanging field terminals
    interchanging supply terminals
    either of and above
    None of the above

interchanging field terminals

Which of the following application requires high starting torque ?
  
    Air blower
    Centrifugal pump
    Lathe machine
    Locomotive

Locomotive

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

    Shunt motor
    Differentially compound motor
    Series motor
    Cumulative compound motor

Series motor

No-load speed of which of the following motor will be highest ?
  
    Series motor
    Differentiate compound motor
    Cumulative compound motor
    Shunt motor

Series motor

For a D.C. shunt motor if the excitation is changed
  
    torque will change but power will remain constant
    torque and power both will change
    torque will remain constant
    torque power and speed all will change

torque will change but power will remain constant

Which motor has the poorest speed control?
  
    Shunt motor
    Series motor
    Differentially compounded motor
    Cumulatively compounded motor

Series motor

Which D.C. motor will be preferred for machine tools ?
  
    Shunt motor
    Series motor
    Cumulative compound motor
    Differential compound motor

Shunt motor

Differentially compound D.C. motors can find applications requiring
  
    frequent on-off cycles
    variable speed
    high starting torque
    low starting torque

low starting torque

Which D.C. motor is preferred for elevators ?
  
    Shunt motor
    Series motor
    Cumulative compound motor
    Differential compound motor

Cumulative compound motor


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