Why are the D.C. motors preferred for traction applications ?

D.C. Motors 14/09/2020

A. Torque and speed are inversely proportional to armature current
B. Torque is proportional to armature current
C. Torque is proportional to square root of armature current
D. The speed is inversely proportional to the torque and the torque is proportional to square of armature current

Related Mcqs:

    When two D.C. series motors are connected in parallel, the resultant speed is____________?
    A. more than the normal speed B. loss than the normal speed C. normal speed D. zero...
    The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is______________?
    A. 4.0 B. 2.0 C. 1.0 D. 0.5...
    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______________?
    A. 2.36% B. 4.76% C. 6.77% D. 8.84%...
    The condition for maximum efficiency for a D.C. generator is______________?
    A. eddy current losses = stray losses B. hysteresis losses = eddy current losses C. copper losses = 0 D. variable losses = constant losses...
    The speed of a D.C. shunt motor is required to be more than full load speed. This is possible by______________?
    A. reducing the field current B. decreasing the armature current C. increasing the armature current D. increasing the excitation current E. none of the above methods...

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