In shunt dc motor the direction of rotation of the motor will reversed. When either field terminals are reversed or armature terminals are reversed. only armature terminals are reversed. only field terminals are changed. none of above. TRUE ANSWER : ? YOUR ANSWER : ?
Which of these types of motor is self starting? None of these. Single phase induction motor. Poly-phase induction motor. Poly-phase synchronous machine. TRUE ANSWER : ? YOUR ANSWER : ?
In DC machine yoke offers both A and B produce working flux flux path completion mechanical protection to the machine TRUE ANSWER : ? YOUR ANSWER : ?
Two generators operating in parallel with rating 50MW and 100MW respectively. Both their respective governor settings are identical as 4%, consider same no load frequency. How will the machine share a common load of 100 MW 50 MW and 50 MW respectively any of the above 66.67 MW and 33.33 MW respectively 33.33 MW and 66.67 MW respectively TRUE ANSWER : ? YOUR ANSWER : ?
What happens if fifth multiples of harmonics is given to induction motor? Either short circuit or open circuit occurs. Fail to start. It will rotates in reverse direction. It will rotates in normal operation. TRUE ANSWER : ? YOUR ANSWER : ?
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is 250 W 300 W 500 W 400W TRUE ANSWER : ? YOUR ANSWER : ?
In a stepper motor the detente torque means minimum of the static torque with the phase winding unexcited. maximum of the static torque with the phase winding unexcited. maximum of the static torque with the phase winding excited. minimum of the static torque with the phase winding excited. TRUE ANSWER : ? YOUR ANSWER : ?
Synchronising power of a synchronous motor varies All of these directly as Xs2 inversely as 1/Xs directly as synchronous reactances Xs TRUE ANSWER : ? YOUR ANSWER : ?
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by KhfBm3. Khf2Bm1.6. KhfBm. KhfBm1.6. TRUE ANSWER : ? YOUR ANSWER : ?
Flashing the field of DC generator means creating residual magnetism by a DC source. making the magnetic losses forces parallel. neutralising residual magnetism. increasing flux density by adding extra turns of winding. TRUE ANSWER : ? YOUR ANSWER : ?