Electrical Machines Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H? 0 V 2 V 4 V 1 V 0 V 2 V 4 V 1 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is 2, 3, 4 1, 2, 3 2, 3 ,5 2, 3, 4, 5 2, 3, 4 1, 2, 3 2, 3 ,5 2, 3, 4, 5 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase supply voltage None of these supply frequency rotor resistance supply voltage None of these supply frequency rotor resistance ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature voltage control is considered suitable for a DC motor driven at constant torque. speed. power. current. torque. speed. power. current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following machines have highest power factor with respect to magnetizing current? Open slot type machines. Semi closed slot type machine. Closed slot type machines. Any of the above. Open slot type machines. Semi closed slot type machine. Closed slot type machines. Any of the above. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would be 12.5% be less than 10% remain unchanged be more than 10% be 12.5% be less than 10% remain unchanged be more than 10% ANSWER DOWNLOAD EXAMIANS APP
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