The speed of a D.C. motor can be varied by varying
The speed of a D.C. motor can be varied by varying
The speed of a D.C. motor can be varied by varying Read More »
DC Motor MCQs
In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will
In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will
The speed of a D.C. shunt motor can be increased by
The speed of a D.C. shunt motor can be increased by
The speed of a D.C. shunt motor can be increased by Read More »
If I2 be the armature current, then speed of a D.C. shunt motor is
If I2 be the armature current, then speed of a D.C. shunt motor is
If I2 be the armature current, then speed of a D.C. shunt motor is Read More »
As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit
As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit
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
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
The armature voltage control of D.C. motor provides
The armature voltage control of D.C. motor provides
The armature voltage control of D.C. motor provides Read More »
Usually wide and sensitive speed control is desired in case of
Usually wide and sensitive speed control is desired in case of
Usually wide and sensitive speed control is desired in case of Read More »
The armature torque of the D.C. shunt motor is proportional to
The armature torque of the D.C. shunt motor is proportional to
The armature torque of the D.C. shunt motor is proportional to Read More »
Which of the following method of speed control of D.C. machine will offer minimum efficiency ?
Which of the following method of speed control of D.C. machine will offer minimum efficiency ?