Electrical Machines As compared to an induction motor, the air gap in a DC motor is between 50% and 90%. less than 50%. more. same. between 50% and 90%. less than 50%. more. same. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A series motor is efficiently suitable for high starting torque operation. none of these. low starting torque operation. constant speed operation. high starting torque operation. none of these. low starting torque operation. constant speed operation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Cross magnetization effects which of the following? both 2 and 3 reduces the terminal voltage reduction in main field flux commutation both 2 and 3 reduces the terminal voltage reduction in main field flux commutation ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is 15.9 Ω 31.1 Ω 31.9 Ω 15.1 Ω 15.9 Ω 31.1 Ω 31.9 Ω 15.1 Ω ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called resonance. cogging. harmonics. crawling. resonance. cogging. harmonics. crawling. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor Increase. None of these. Remains same. Decrease. Increase. None of these. Remains same. Decrease. ANSWER DOWNLOAD EXAMIANS APP
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