Electrical Machines In a transformer which of the following losses are zero? Iron loss All of these Rotational loss Copper loss Iron loss All of these Rotational loss Copper loss ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the temperature of armature resistance is increased, the speed of a series motor would decrease. None of above. increase. not change. decrease. None of above. increase. not change. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Magnetic field of a DC generator is produced by what? Permanent magnets. Electromagnets. Both B and C. None of the options. Permanent magnets. Electromagnets. Both B and C. None of the options. 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. sR2 = X2. R2 = s2X2. R2 = sX2. R2 = s2X2. sR2 = X2. R2 = s2X2. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor Oscillates around the rated speed. Remains unchanged. Increases. Decreases. Oscillates around the rated speed. Remains unchanged. Increases. Decreases. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The emf induced in the dc generator armature winding is AC AC and DC None of these DC AC AC and DC None of these DC ANSWER DOWNLOAD EXAMIANS APP
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