Electrical Machines The heat transfer by convection in a transformer least depends on color of the paint. air velocity. surface area. temperature difference. color of the paint. air velocity. surface area. temperature difference. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be 25.564 Ω. 2.74 Ω. 2.241 Ω. 2.781 Ω. 25.564 Ω. 2.74 Ω. 2.241 Ω. 2.781 Ω. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the source voltage of a DC motor is increased, which of the following will decrease? Starting torque, operating speed, full load current. Starting torque. Full load current. Operating speed. Starting torque, operating speed, full load current. Starting torque. Full load current. Operating speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following motor is suitable for frequent starting and stoppings? Resistance split phase motor Capacitor start motor Capacitor start capacitor run motor All of these Resistance split phase motor Capacitor start motor Capacitor start capacitor run motor All of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The output power of a dc motor is given by EbIa2. none of these. EIa. EbIa. EbIa2. none of these. EIa. EbIa. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly 120 V 175 V 140 V 240 V 120 V 175 V 140 V 240 V ANSWER DOWNLOAD EXAMIANS APP
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