Electrical Machines For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with constant supply voltage V, starting torque Tst decreases constant V, Tst increases None of these either of these constant supply voltage V, starting torque Tst decreases constant V, Tst increases None of these either of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The speed regulation of a DC motor is given as NnL − NfL. (NfL − NnL)/NnL. (NnL − NfL)/NfL. NnL/NfL. NnL − NfL. (NfL − NnL)/NnL. (NnL − NfL)/NfL. NnL/NfL. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be 10 Ω. 2 Ω. 4 Ω. 8 Ω. 10 Ω. 2 Ω. 4 Ω. 8 Ω. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The working principle of transformer depends on Amperes law. Faradays law of electromagnetic induction. Newtons law. Coulombs law. Amperes law. Faradays law of electromagnetic induction. Newtons law. Coulombs law. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Compensating winding are used to rectify the flux density waveform at throughout the air gap. None of these region under main pole. interpole region. throughout the air gap. None of these region under main pole. interpole region. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines On what factors the speed of dc motor depends? Armature current Ia. Field flux. All of these. Applied voltage. Armature current Ia. Field flux. All of these. Applied voltage. ANSWER DOWNLOAD EXAMIANS APP
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