Electrical Machines A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms. 0.573. 0.649. 0.443. 0.512. 0.573. 0.649. 0.443. 0.512. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The constant losses in transformer is/are copper loss. eddy current loss. hysteresis loss. both 2 and 3. copper loss. eddy current loss. hysteresis loss. both 2 and 3. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following statements are correct ? Both 1 and 2. None of these A small value of leakage reactance will increase the maximum power output of motor. The leakage reactance of the induction motor should be small. Both 1 and 2. None of these A small value of leakage reactance will increase the maximum power output of motor. The leakage reactance of the induction motor should be small. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a 3-phase induction motor, torque and supply voltage are related as T ∝ V T ∝ 1/V² T ∝ 1/V T∝ V² T ∝ V T ∝ 1/V² T ∝ 1/V T∝ V² ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which type of bearing is provided in small induction motors to support the rotor shaft? Cast iron bearings. None of these Ball bearings. Bush bearings. Cast iron bearings. None of these Ball bearings. Bush bearings. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a seperately excited DC Motor if field current is increased, it will Increase speed Reduce starting torque. Increase acceleration duration. Reduce armature heating. Increase speed Reduce starting torque. Increase acceleration duration. Reduce armature heating. ANSWER DOWNLOAD EXAMIANS APP
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