1. Transformer is used to change the values of
a) voltage
b) frequency
c) power
d) power factor
ans. a
2. The path of the magnetic flux in a transformer has
a) high reluctance
b) low resistance
c) high conductivity
d) low reluctance
ans. d
3. Transformer is a
a) Rotating device
b) Static device
c) Magnetic device
d) none of the above
ans. b
4. Transformer works on
a) a.c
b) d.c
c) a.c and d.c both
d) pulsating d.c
ans. a
5. Transformer works on the principle of
a) self-induction
b) mutual induction
c) Faraday's law of electro magnetic induction
d) self and mutual induction both
ans. d
6. Transformer is device which transform the voltage
a) from higher level to lower level
b) from lower level to higher level
c) both a and b
d) none of these
ans. c
7. If d.c supply is given to a transformer it may
a) work
b) not work
c) give lower voltage than the rated voltage on secondary side
d) burn the winding
ans.d
8. Different types of transformers are
a) core type
b) shell type
c) berry type
d) All the these
ans. d
9. Rating of transformer is given in
a) kVA
b) kVAR
c) kW
d) Watts
ans. a
10. If a higher voltage is given to the primary and low voltage is taken from the secondary of transformer it is called
a) step-up
b) step-down
c) instrument transformer
d) stabilizer
ans. b
