1. If the supply frequency of the transformer is doubled:
a) Hysteresis loss also doubles
b) eddy current loss also doubles
c) iron loss doubles
d) copper loss double
2. Open circuit test in the transformer is performed with:
a) Rated transformer voltage
b) Rated transformer current
c) direct current
d) High frequency supply
3. The mutual flux in a loaded transformer can be varied by:
a) Primary current
b) Load Impedance
c)Secondary current
d) Reluctance of the magnetic path
4. In a transformer __ decreases with increase in the leakage flux
a) Primary induced emf
b) Secondary Induced emf
c) Secondary terminal voltage
d) none of the above
5. The power factor of the power transformer on no load will be about:
a) unity
b) 0.75
c) 0.5
d) 0.35
6. The flux in the transformer core:
a) Increases with increase in load
b) Decreases with increase in load
c) Remain constant
d)It depends on the type of load (inductive or capacitive)
7. In a transformer circuit mode, the core loss is represented as a
a) Series resistance
b) Series inductance
c) Shunt resistance
d) Shunt inductance
8. The transformer has zero regulation at:
a) Zero power factor
b) unity power factor
c) lagging power factor
d) leading power factor
a) Hysteresis loss also doubles
b) eddy current loss also doubles
c) iron loss doubles
d) copper loss double
2. Open circuit test in the transformer is performed with:
a) Rated transformer voltage
b) Rated transformer current
c) direct current
d) High frequency supply
3. The mutual flux in a loaded transformer can be varied by:
a) Primary current
b) Load Impedance
c)Secondary current
d) Reluctance of the magnetic path
4. In a transformer __ decreases with increase in the leakage flux
a) Primary induced emf
b) Secondary Induced emf
c) Secondary terminal voltage
d) none of the above
5. The power factor of the power transformer on no load will be about:
a) unity
b) 0.75
c) 0.5
d) 0.35
6. The flux in the transformer core:
a) Increases with increase in load
b) Decreases with increase in load
c) Remain constant
d)It depends on the type of load (inductive or capacitive)
7. In a transformer circuit mode, the core loss is represented as a
a) Series resistance
b) Series inductance
c) Shunt resistance
d) Shunt inductance
8. The transformer has zero regulation at:
a) Zero power factor
b) unity power factor
c) lagging power factor
d) leading power factor
