ELECTRICIAN IN ENGLISH Quiz - 835


The power mentioned on the name plate of an electric motor indicates
  
    the gross power
    the power drawn in kVA
    the power drawn in kW
    the output power available at the shaft

the output power available at the shaft

Which D.C. motor has got maximum self loading property?
  
    Series motor
    Shunt motor
    Differential compounded motor
    Cumulatively compounded ‘motor

Differential compounded motor

Which D.C. motor will be suitable along with flywheel for intermittent light and heavy loads?
  
    Cumulatively compounded motor
    Differential compounded motor
    Shunt motor
    Series motor

Cumulatively compounded motor

D.C. series motors are used
  

    in none of the above situations.
    where load changes frequently
    where load is constant
    where constant operating speed is needed

in none of the above situations.

If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens
  
    motor will run at very slow speed
    this will result in excessive speed possibly destroying armature due to excessive centrifugal stresses 
    nothing will happen to the motor
    this will make armature to take heavy current possibly burning it

this will result in excessive speed possibly destroying armature due to excessive centrifugal stresses 

As -the load is increased the speed of D.C. shunt motor will
  
    reduce slightly
    increase slightly
    increase proportionately
    remains unchanged

reduce slightly

The armature torque of the D.C. shunt motor is proportional to
  
    none of the above
    both and
    field flux only
    armature current only

armature current only

The speed of a motor falls from 1100 r.p.m. at no-load to 1050 r.p.m. at rated load. The speed regulation of the motor is
  
    0.0236
    0.0677
    0.0476
    0.0884

0.0476

The armature voltage control of D.C. motor provides
  
    constant torque drive
    none of the above
    constant current drive
    constant voltage drive

constant torque drive

As there is no back e.m.f. at the instant of starting a D.C. motor in order to prevent a heavy current from flowing though the armature circuit
  
    a resistance is connected in series with armature
    armature is temporarily open circuited
    a resistance is connected parallel to the armature
    a high value resistor is connected across the field winding

a resistance is connected in series with armature


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