In the D.C. motor the iron losses occur in____________?
In the D.C. motor the iron losses occur in____________?
A. the field
B. the armature
C. the brushes
D. the commutator
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The plugging gives the____________?
The plugging gives the____________?
A. zero torque braking
B. smallest torque braking
C. highest torque braking
D. none of the aboveThe losses occurring in a D.C. generator are given below. Which loss is likely to have highest proportion at rated load of the generator ?
The losses occurring in a D.C. generator are given below. Which loss is likely to have highest proportion at rated load of the generator ?
A. hysteresis loss
B. field copper loss
C. armature copper loss
D. eddy current lossOne D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven_______________?
One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven_______________?
A. runs as a generator
B. does not run as a generator
C. also runs as a motor comes to stop after sometimeWhich of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator ?
Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator ?
A. Providing laminations in armature core
B. Providing laminations in stator
C. Using non-magnetic material for frame
D. Using material of low hysteresis co-efficient for armature core materialThe size of poxvirus is_______________?
The size of poxvirus is_______________?A. 20 nm
B. 200 nm
C. 250 nm
D. 300 nmWhat 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?
A. The motor will stop
B. The motor will continue to run
C. The armature may burn
D. The motor will run noisy