Ward Leonard method of speed control is basically a______________?
Ward Leonard method of speed control is basically a______________?
A. field control method
B. armature controlled method
C. field diverter
D. frequency control method
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The condition for maximum power in case of D.C. motor is______________?
The condition for maximum power in case of D.C. motor is______________?
A. back e.m.f. = 2 x supply voltage
B. back e.m.f. = | x supply voltage
C. supply voltage = | x back e.m.f
D. supply voltage = back e.m.fThe size of poxvirus is_______________?
The size of poxvirus is_______________?A. 20 nm
B. 200 nm
C. 250 nm
D. 300 nmThese days D.C. motors are widely used in____________?
These days D.C. motors are widely used in____________?
A. pumg sets
B. air compressors
C. electric traction
D. machine shopsD.C. shunt motors are used for driving____________?
D.C. shunt motors are used for driving____________?
A. trains
B. cranes
C. hoists
D. machine toolsWhich motor should not be started on no-load ?
Which motor should not be started on no-load ?
A. Series motor
B. Shunt motor
C. Cumulatively compounded motor
D. Differentially compounded motorThe 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 loss