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Multiple Choice Quiz
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1
A transformer consists of two or more coils linked together by electrostatic coupling.
A)True
B)False
2
An autotransformer provides no electrical isolation.
A)True
B)False
3
Whether a secondary is a step-up or step-down winding is determined by the primary-to-secondary turns ratio.
A)True
B)False
4
The voltage induced in the core of a transformer causes skin-effect current.
A)True
B)False
5
The current in the primary of an unloaded transformer is called the energizing current.
A)True
B)False
6
Power dissipated in the windings of a transformer is referred to as
A)hysteresis loss
B)eddy current loss
C)copper loss
D)flux loss
7
What type of transformer is used only at power and audio frequencies?
A)laminated-iron-core
B)air-core
C)rf
D)autotransformers
8
When the internal impedance of a source is equal to the impedance of the load
A)impedance matching results
B)minimum power is transferred
C)impedance is mismatched
D)efficiency is 50%
9
The instantaneous polarity of the windings of a transformer is called the
A)inductive kick
B)peak
C)phasing
D)coefficient
10
The current in the primary of an unloaded transformer is called the
A)energizing current
B)eddy current
C)de-energizing current
D)skin-effect current





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