Related Questions

A transformer can have regulation closer to zero
A on full-load
B on overload
C on leading power factor
D on zero power factor
A good voltage regulation of a transformer means
A output voltage fluctuation from no load to full load is least
B output voltage fluctuation with power factor is least
C difference between primary and secondary voltage is least
D difference between primary and secondary voltage is maximum
The voltage regulation in magnetic amplifier type voltage regulator is effected by
A Electromagnetic induction
B Varying the resistance
C Varying the reactance
D Variable transformer
If a transformer is switched on to a voltage more than the rated voltage
A its power factor will deteriorate
B its power factor will increase
C its power factor will remain unaffected
D its power factor will be zero
The secondary voltage for a certain power transformer is twice the voltage applied to the primary. The current flowing in the secondary winding will be:
A One-half the primary current
B Same as the primary current
C Twice the primary current
D No more than 10% less than the primary current
E None of the above
Which of the following is the main advantage of an auto-transformer over a two-winding transformer?
A Eddy losses are totally eliminated
B Copper losses are negligible
C Saving in winding material
D Hysteresis losses are reduced
The output transformer used in a power amplifier is a ___________ transformer
A 1:1 ratio
B Step-up
C Step-down
D None of the above
The changes in volume of transformer cooling oil due to variation of atmospheric tem-perature during day and night is taken care of by which part of transformer
A Conservator
B Breather
C Bushings
D Buchholz relay
Which of the following is the main advantage of an auto-transformer over a two winding transformer?
A Hysteresis losses are reduced
B Saving in winding material
C Copper losses are negligible
D Eddy losses are totally eliminated
Power amplifiers generally use transformer coupling because transformer per-mits
A Cooling of the circuit
B Impedance matching
C Distortionless output
D Good frequency response

Next steps