Electrical Machines The material used for commutator brushes is mostly cast iron. copper. carbon. mica. cast iron. copper. carbon. mica. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Capacitor start capacitor run provides none. high power factor only. high staring torque only. high staring torque and high power factor. none. high power factor only. high staring torque only. high staring torque and high power factor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The synchronous speed of an induction motor will be increased by increasing number of poles. increasing of frequency. decreasing of frequency. speed can not be increased. increasing number of poles. increasing of frequency. decreasing of frequency. speed can not be increased. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the stator phases of the motor. starting resistance in the starter. None of these rotor at slip rings. stator phases of the motor. starting resistance in the starter. None of these rotor at slip rings. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is 0.08 pu. 0.02 pu. 0.16 pu. 0.01 pu. 0.08 pu. 0.02 pu. 0.16 pu. 0.01 pu. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be R2 = sX2. R2 = s2X2. R2 = s2X2. sR2 = X2. R2 = sX2. R2 = s2X2. R2 = s2X2. sR2 = X2. ANSWER DOWNLOAD EXAMIANS APP
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