In a DC machine current and emf at the terminals are alternating. current and emf in armature are unidirectional current and emf in armature are alternating. emf in armature conductors and at the terminals is alternating. TRUE ANSWER : ? YOUR ANSWER : ?
In a transformer maximum flux density is not constant, the eddy current loss varies as V f V² f² TRUE ANSWER : ? YOUR ANSWER : ?
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be 0.54 Ω. 0.01 Ω. 0.54 Ω. 0.06 Ω. TRUE ANSWER : ? YOUR ANSWER : ?
In which of the following generators negative voltage regulation can occur? both B and C shunt generator over compound generator series generators TRUE ANSWER : ? YOUR ANSWER : ?
In which transformer, the tertiary winding is used? Star - delta Star - star Delta - star Delta - delta TRUE ANSWER : ? YOUR ANSWER : ?
Capacitor fitted with ceiling / table fans is of the value of 2 - 3 µF. 5 - 10 F. 1 - 2 µF. 0.1 µF. TRUE ANSWER : ? YOUR ANSWER : ?
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected through inductive coupling either of these depending on the design of the motor in parallel in series TRUE ANSWER : ? YOUR ANSWER : ?
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be 18° 72° 30° 36° TRUE ANSWER : ? YOUR ANSWER : ?
If in DC Shunt Motor the flux is reduced suddenly to zero, then the speed of motor will be reduced. the armature current will reduce. the motor will come to stop. the motor will attain dangerously high speed. TRUE ANSWER : ? YOUR ANSWER : ?
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease? 19% 5% 40% 10% TRUE ANSWER : ? YOUR ANSWER : ?