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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