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. 0.649. 0.512. 0.573. 0.443. 0.649. 0.512. 0.573. 0.443. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The back emf produced in a dc motor depends on P. Z. P and Z. none of these. P. Z. P and Z. none of these. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Addition of 0.3 % to 4.5 % silicon to iron None of these reduces the saturation magnetization. increases the electrical resistivity of iron. increases the hysteresis loss. None of these reduces the saturation magnetization. increases the electrical resistivity of iron. increases the hysteresis loss. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required 0.45 Ω. 0.78 Ω. 0.66 Ω. 0.24 Ω. 0.45 Ω. 0.78 Ω. 0.66 Ω. 0.24 Ω. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines On which of the following factor/factors the speed of a DC motor depends upon? All of these. Applied voltage. Armature current. Field flux. All of these. Applied voltage. Armature current. Field flux. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Slip rings of an induction motors are made of phosphor bronze. stainless steel. aluminium. carbon. phosphor bronze. stainless steel. aluminium. carbon. ANSWER DOWNLOAD EXAMIANS APP
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