The speed of a D.C. shunt motor can be increased by_______________?

Related Mcqs:

In D.C. machines fractional pitch winding is used__________?

A. to improve cooling B. to reduce copper losses C. to increase the generated e.m.f. D. to reduce the sparking...

If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens__________?

A. nothing will happen to the motor B. this will make armature to take heavy current, possibly burning it C. this will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses D. motor will run at very slow speed...

If a D.C. motor designed for 40°C ambient temperature is to be used for 50°C ambient temperature, then the motor_____________?

A. of lower H.P. should be selected B. of higher H.P. should be selected C. can be used for 50°C ambient temperature also D. is to be derated by a factor recommended by manufacturer and select the next higher H.P. motor...

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...

A dc series motor should not be started on no load because it would___________?

A. not develop starting torque B. fail to start without load C. run at dangerously high speed D. draw more current without producing sufficient torque...