1111. The basic function ofa transformer is to change :

A. The level of the voltage *
B. The power level
C. The power factor
D. The frequency

1112. In an ordinary transformer which of the following does not change :

A. Voltage
B. Current
C. Frequency *
D. All of the above

1113. The efficiency of a power transformer is around :

A. 50 %
B. 60 %
C. 80 %
D. 95 % *

1114. in as transformer electrical power is transferred from primary to secondary :

A. Though air
B. By magnetic flux *
C. Through insulating medium
D. None of these

1115. The two windings of a transformer are :

A. Conductively linked
B. Inductively linked *
C. Not linked at all
D. Electrically linked

1116. Transformer action requires a :

A. Constant magnetic flux
B. Increasing magnetic flux
C. Alternating magnetic flux *
D. Alternating electric flux

1117. The flux created by the current flowing through the primary always have :

A. Primary winding only
B. Secondary winding only
C. Transformer core only
D. Both Primary and secondary windings *

1118. The primary and secondary windings of a power transformer always have :

A. A common magnetic circuit *
B. Separate magnetic circuits
C. Wire of same size
D. Same number of turns

1119. The iron core in a transformer provides a ______ path to the main flux:

A. Low reluctance *
B. high reluctance
C. Low resistance
D. High conductivity

1120. If rated dc voltage is applied instead of ac to the primary of a transformer :

A. Secondary of transformer will burn
B. Primary of transformer will burn *
C. Secondary voltage will be excessively high
D. There will be no secondary voltage