What is the function of a transformer?

A Transformer is used to step down or up the AC voltages and currents
B Transformer is used to step down or up the DC voltages and currents
C Transformer converts DC to AC voltages
D Transformer converts AC to DC voltages

Correct Answer: Transformer is used to step down or up the AC voltages and currents

A Transformer does not work on DC and operates only on AC, therefore it Step up or Step down the level of AC Voltage or Current, by keeping frequency of the supply unaltered on the secondary side.
Bissoy MCQ
#Transformer

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
What is the function of breather in a transformer?
A To provide oxygen inside the tank
B To cool the coils during reduced load
C To cool the transformer oil
D To arrest flow of moisture when outside air enters the transformer
The function of conservator in a transformer is
A to project against internal fault
B to reduce copper as well as core losses
C to cool the transformer oil
D to take care of the expansion and contraction of transformer oil due to variation of temper-ature of sur-roundings
The function of breather in a transformer is
A to provide oxygen inside the tank
B to cool the coils during reduced load
C to cool the transformer oil
D to arrest flow of moisture when outside air enters the transformer
In the transformer the function of a conservator is to
A Provide fresh air for cooling the transformer
B Supply cooling oil to transformer in time of need
C Protect the transformer from damage when oil expends due to heating
D None of the above
In a step down transformer, there is a charge of 15A in the load current. This results in changing of supply current of
A Less than 15 A
B Greater than 21 A
C More Than 21A
D None

Next steps