Usually wide and sensitive speed control is desired in case of? Mark as favorite Copy Link centrifugal pumps elevators steel rolling mills colliery winders Check Answer
Small D.C. motors up to 5 H.P. usually have? Mark as favorite Copy Link 2 poles 4 poles 6 poles 8 poles Check Answer
For which of the following applications a D.C. motor is preferred over an A.C. motor? Mark as favorite Copy Link Low speed operation High speed operation Variable speed operation Fixed speed operation Check Answer
Following motor ls used where high starting torque and wide speed range control is required? Mark as favorite Copy Link Single phase capacitor start Induction motor Synchronous motor D.C. motor Check Answer
Compensating winding in a D.C. machine is placed? Mark as favorite Copy Link on yoke in the pole faces on yoke in the interpolar gap on armature none of the above Check Answer
D.C. motor is to a drive a load which is almost nil for certain part of the load cycle and peak value for short duration. We will select this? Mark as favorite Copy Link series motor shunt motor compound motor any of the above Check Answer
In a D.C. motor, the ratio E¡/V4 indicates? Mark as favorite Copy Link running torque of the motor starting torque of the motor efficiency of the motor speed regulation of the motor Check Answer
In a D.C. motor if the back e.m.f. is absent? Mark as favorite Copy Link motor will burn motor will not run at all motor will run at very slow speed motor will run at very high speed Check Answer
Which of the following is not necessarily the advantage of D.C. motors over A.C. motors? Mark as favorite Copy Link Better speed control Low cost High starting torque Wide speed range Check Answer
Which of the following methods is most economical for finding the no-load losses of a large D.C shunt motor? Mark as favorite Copy Link Retardation test Swinburne's test Hopkinson's test none of the above Check Answer