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

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...