The transformer oil should have _______ volatility and _______ viscosity?

A. low,low
B. high,high
C. low,high
D. high,low

The transformer lamination’s are insulated from each other by____________?

A. mica strip
B. thin coat of varnish
C. paper
D. any of the above

Which type of winding is used in 3 phase shell-type transformer?

A. Circular type
B. Sandwich type
C. Cylindrical type
D. Rectangular type

During open circuit test of a transformer:

A. primary is supplied rated voltage
B. primary is supplied full-load current
C. primary is supplied current at reduced voltage
D. primary is supplied rated kVA

Open circuit test on transformers is conducted to determine____________?

A. hysteresis losses
B. copper losses
C. core losses
D. eddy current losses

If the supply frequency to the transformer is increased,”the iron loss will__________?

A. not change
B. decrease
C. increase
D. any of the above

Negative voltage regulation is indicative that the load is___________?

A. capacitive only
B. inductive only
C. inductive or resistive
D. none of the above

Iron loss of a transformer can be measured by____________?

A. low power factor wattmeter
B. unity power factor wattmeter
C. frequency meter
D. any type of wattmeter

When secondary of a current transformer is open-circuited its iron core will be__________?

A. hot because of heavy iron losses taking place in it due to high flux density
B. hot because primary will carry heavy current
C. cool as there is no secondary current
D. none of above will happen

When a given transformer is run at its rated voltage but reduced frequency, its____________?

A. flux density remains unaffected
B. iron losses are reduced
C. core flux density is reduced
D. core flux density is increased