Regenerative braking on D.C. shunt motors is used when? Mark as favorite Copy Link the load has overhauling characteristics the load is variable the load also acts as a braking force the load is constantly decreasing Check Answer
In an overloaded motor main danger arises due to? Mark as favorite Copy Link winding getting overheated busbars getting heated starter getting damaged bearings getting overheated Check Answer
The function of a field regulator for compound motors is to? Mark as favorite Copy Link control the flux limit the armature current demagnetise the field partially none of the above Check Answer
The main disadvantage of Hopkinson’s test for finding efficiency of the shunt D.C. motors is that it? Mark as favorite Copy Link needs one motor and one generator requires two identical shunt machines requires full-load power ignores any change in iron loss Check Answer
Which of the following tests can be used to determine no-load losses in a D.C. shunt motor? Mark as favorite Copy Link Running down test Swinburne's test Field test Brake test Check Answer
Which of the following methods gives the greatest braking torque? Mark as favorite Copy Link Regenerative braking Plugging Rheostatic braking None of the above Check Answer
A shearing machine has cyclic load consisting of intermittent light and henry loads. Which of the following D.C. motor will be suitable for this purpose? Mark as favorite Copy Link Series motor Shunt motor Cumulative compound motor Differential compound motor Check Answer
If a D.C. motor is connected across the A.C. supply it will? Mark as favorite Copy Link run at normal speed not run run at lower speed burn due to heat produced in the field winding by eddy currents Check Answer
The total losses in a well designed D.C. generator of 10 kW will be nearly? Mark as favorite Copy Link 100 W 500 W 1000 W 1500 W Check Answer
To get the speed of D.C motor below the normal without wastage of electrical energy …… is used? Mark as favorite Copy Link Ward Leonard control rheostatic control any of the above method none of the above method Check Answer