What is the function of inter pole in DC generator? To serve the economical aspects. Both option B and C. To neutralize the distortion of main field flux due to armature reaction. To get a superior commutation. TRUE ANSWER : ? YOUR ANSWER : ?
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of None of these residual magnetism. armature reaction. permanent magnets. TRUE ANSWER : ? YOUR ANSWER : ?
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. 4 Ω. 2 Ω. 8 Ω. TRUE ANSWER : ? YOUR ANSWER : ?
In a transformer zero voltage regulation is achieved at a load power factor which is zero unity leading lagging TRUE ANSWER : ? YOUR ANSWER : ?
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch 1 10 100 50 TRUE ANSWER : ? YOUR ANSWER : ?
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when the generator runs on designed speed. there is no load on the generator. the generator runs on full load. the generator runs on overload. TRUE ANSWER : ? YOUR ANSWER : ?
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be 48.0%. 88.8%. 57.1%. 59.2%. TRUE ANSWER : ? YOUR ANSWER : ?
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%. 920 RPM 960 RPM 970 RPM 940 RPM TRUE ANSWER : ? YOUR ANSWER : ?
In circle diagram for induction motor, diameter of circle represents which of the following ? Rotor current. Slip. Line voltage. Running torque. TRUE ANSWER : ? YOUR ANSWER : ?
Armature reaction depends on which of the following? power factor of load both 1 and 2 magnitude of load current None of these TRUE ANSWER : ? YOUR ANSWER : ?