The armature voltage control of D.C. motor provides? Mark as favorite Copy Link constant torque drive constant voltage drive constant current drive none of the above Check Answer
Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator? Mark as favorite Copy Link Providing laminations in armature core Providing laminations in stator Using non-magnetic material for frame Using material of low hysteresis coefficient for armature core material Check Answer
A motor for punching machine is usually subjected to? Mark as favorite Copy Link no load continuous part load continuous full load intermittent Load Check Answer
In case of a shunt motor if the supply voltage is increased by 10%, which of the following will decrease? Mark as favorite Copy Link full load current full load speed starting torque none of the above Check Answer
When the armature of a D.C. motor rotates, e.m.f. induced is? Mark as favorite Copy Link self-induced e.m.f. mutually induced e.m.f. back e.m.f. none of the above Check Answer
Which of the following methods of braking is used in rolling mills? Mark as favorite Copy Link Dynamic braking Plugging Regenerative braking Mechanical brakes Check Answer
If the speed of a D.C. shunt motor is increased the back e.m.f. of the motor will? Mark as favorite Copy Link decrease increase remain same become zero Check Answer
For which application a D.C. motor is preferred over an AC. motor? Mark as favorite Copy Link High speed operation Low speed operation Fixed speed operation Variable speed operation Check Answer
Sparking is discouraged in a D.C. motor because? Mark as favorite Copy Link it increases the input power consumption commutator gets damaged both (a) and (b) none of the above Check Answer
Which motor should not be started on no-load? Mark as favorite Copy Link Series motor Shunt motor Cumulatively compounded motor Differentially compounded motor Check Answer