Electrical Machines A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is 1 Hz 0 Hz 5 Hz 50 Hz 1 Hz 0 Hz 5 Hz 50 Hz ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Dummy coils are used for increasing efficiency. reducing armature reaction. All of these mechanical balancing. increasing efficiency. reducing armature reaction. All of these mechanical balancing. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated) changes to three times the original value changes to 1.5 times the original value remain the same as the original changes to 0.5 times the original value changes to three times the original value changes to 1.5 times the original value remain the same as the original changes to 0.5 times the original value ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load? 1037.5 r.p.m. 1130 r.p.m. 4575.4 r.p.m. 963.8 r.p.m. 1037.5 r.p.m. 1130 r.p.m. 4575.4 r.p.m. 963.8 r.p.m. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines _____________ types of induction motor are widely used. Three phase IM. Slip ring IM. Squirrel cage IM. Single phase IM. Three phase IM. Slip ring IM. Squirrel cage IM. Single phase IM. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following methods are used to control the speed of DC motors is supply voltage control armature circuit resistance control All of these field current control supply voltage control armature circuit resistance control All of these field current control ANSWER DOWNLOAD EXAMIANS APP
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