The armature voltage control of D.C. motor provides_____________?
The armature voltage control of D.C. motor provides_____________?
A. constant voltage drive
B. constant current drive
C. constant torque drive
D. none of the above
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D.C. shunt motors are used for driving____________?
D.C. shunt motors are used for driving____________?
A. trains
B. cranes
C. hoists
D. machine toolsD.C. series motors are used______________?
D.C. series motors are used______________?
A. where load is constant
B. where load changes frequently
C. where constant operating speed is needed
D. in none of the above situationsD.C. generators are normally designed for maximum efficiency around_____________?
D.C. generators are normally designed for maximum efficiency around_____________?
A. full-load
B. rated r.p.m.
C. rated voltage
D. all of the aboveThe plugging gives the____________?
The plugging gives the____________?
A. zero torque braking
B. smallest torque braking
C. highest torque braking
D. none of the aboveTo get the speed of D.C, motor below the normal without wastage of electrical energy is used?
To get the speed of D.C, motor below the normal without wastage of electrical energy is used?
A. Ward Leonard control
B. rheostatic control
C. any of the above method
D. none of the above methodSparking at the commutator of a D.C. motor may result in____________?
Sparking at the commutator of a D.C. motor may result in____________?
A. damage to commutator segments
B. damage to commutator insulation
C. increased power consumption
D. all of the above