300 Important DC Motor MCQ Questions & Answers with Explanation | PDF Free Download
1.The retardation test for dc shunt machines is employed for determination of
- AStray losses
- BWindage and friction losses
- CMagnetic or core losses
- DCopper losses
2.In a field?s test for dc series machines, the series fields of two machines, the series field of two machines are connected in series so as to make ____losses of both machines equal.
- ACopper
- BIron
- CFriction and windage
- DTotal
3.In the field's test for dc series machines, the difficulty of obtaining readings at relatively light loads is overcome by connecting
- AThe generator series field in series with the motor armature
- BThe motor series field in series with the generator armature
- CThe generator armature in series with the motor
- DThe motor armature in series with the generator
4.The main common thing in Hopkinson's and field's tests is that
- ABoth tests are regenerative
- BBoth tests use two identical mechanically coupled dc machines
- CThe power drawn in both the tests is negligible to meet the internal losses only
- DAll of the above
5.Which of the following tests can be conducted on other than shunt machines?
- ASwinburn?s test
- BRetardation test
- CField?s test
- DBack to back test