Related Questions

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
Which winding of the transformer has less cross-sectional area?
A Primary winding
B Secondary winding
C Low voltage winding
D High voltage winding
In the transformer following winding has got more cross-sectional area
A Low voltage winding
B High voltage winding
C Primary winding
D Secondary winding
An ideal transformer is one which has
A no losses and magnetic leakage
B interleaved primary and secondary windings
C a common core for its primary and secondary windings
D core of stainless steel and winding of pure copper metal
No-load current of a transformer has
A has high magnitude and low power factor
B has high magnitude and high power factor
C has small magnitude and high power factor
D has small magnitude and low power factor
The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a
A single-phase winding
B two-phase winding
C three-phase winding
D any of the above

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