Related Questions

Harmonics in transformer result in
A Increased core losses
B Increased I2R losses
C Magnetic interference with communication circuits
D All of the above
The main reason for generation of harmonics in a transformer could be
A fluctuating load
B poor insulation
C mechanical vibrations
D saturation of core
Vibration of which among the following produces only odd harmonics?
A A vibrating rod fixed at two ends
B A vibrating string fixed at two ends
C An air column in a closed organ pipe
D An air column in an open organ pipe
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
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
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
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
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
Part of the transformer which is most subject to damage from overheating is
A iron core
B copper winding
C winding insulation
D frame or case
For seccessful operation of two single phase transformer connected in parallel, the most essential condition is that their
A Percentage impledances are equal
B Polarities are properly connected
C Turns ration are exactly equal
D KVA rating are equal

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