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 None of these. Remains same. Increase. Decrease. None of these. Remains same. Increase. Decrease. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Torque angle of a synchorous machine operating from a constant voltage bus is usually defined as the space angle between Rotor mmf wave and resultant flux density wave. Stator mmf wave and resultant mmf wave. Rotor mmf wave and stator mmf wave. Stator mmf wave and resultant flux density. Rotor mmf wave and resultant flux density wave. Stator mmf wave and resultant mmf wave. Rotor mmf wave and stator mmf wave. Stator mmf wave and resultant flux density. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that both Eb and Td are unchanged both Eb and Td are zero Eb is zero, but Td is unchanged Eb is unchanged, but Td is zero both Eb and Td are unchanged both Eb and Td are zero Eb is zero, but Td is unchanged Eb is unchanged, but Td is zero ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following will vary the maximum torque? rotor resistance R both 1 and 2 rotor reactance X None of these rotor resistance R both 1 and 2 rotor reactance X None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:- 2, 3 and 4. 2 and 4. 1, 2 and 3. 1, 3 and 4. 2, 3 and 4. 2 and 4. 1, 2 and 3. 1, 3 and 4. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines stepped cores are used in transformers in order to reduce volume of iron. iron loss. volume of copper. reluctance of core. volume of iron. iron loss. volume of copper. reluctance of core. ANSWER DOWNLOAD EXAMIANS APP
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