DC Motors What will happen if the back emf of a dc motor vanishes suddenly? The motor will stop The armature may burn The motor will run noisy The motor will continue to run The motor will stop The armature may burn The motor will run noisy The motor will continue to run ANSWER DOWNLOAD EXAMIANS APP
DC Motors Excessive motor vibration is caused by Open armature coil Worn bearings Bent shaft Too much brush tension Open armature coil Worn bearings Bent shaft Too much brush tension ANSWER DOWNLOAD EXAMIANS APP
DC Motors In which of the following tests only one motor is required? Hopkinson's test Field's test Swinburne's test Brake test Hopkinson's test Field's test Swinburne's test Brake test ANSWER DOWNLOAD EXAMIANS APP
DC Motors In a dc machines the residual magnetism is of the order of 10 to 15 percent 50 to 75 percent 20 to 25 percent 2 to 3 percent 10 to 15 percent 50 to 75 percent 20 to 25 percent 2 to 3 percent ANSWER DOWNLOAD EXAMIANS APP
DC Motors The starting resistance of a DC motor is generally 1000 Ω Around 500 Ω Infinitely large Low 1000 Ω Around 500 Ω Infinitely large Low ANSWER DOWNLOAD EXAMIANS APP
DC Motors The direction of rotation of a D.C. series motor can be changed by Interchanging supply terminals Interchanging field terminals Either of (A) and (B) above None of these Interchanging supply terminals Interchanging field terminals Either of (A) and (B) above None of these ANSWER DOWNLOAD EXAMIANS APP
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