1. A triac has three terminals viz
A. drain, source, gate
B. two main terminal and a gate terminal
C. cathode, anode, gate
D. none of the above

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2. A triac is equivalent to two SCRs
A. in parallel
B. in series
C. in inverse-parallel
D. none of the above

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3. A triac is a ___ switch
A. bidirectional
B. unidirectional
C. mechanical
D. none of the above

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4. The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of in the first quadrant.
A. transistor
B. SCR
C. UJT
D. none of the above

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5.  A triac can pass a portion of half-cycle through the load.
A. only positive
B. only negative
C. both positive and negative
D. none of the above

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6.  A diac has ____ terminals.
A. two
B. three
C. four
D. none of the above

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7. A triac has ____ semiconductor layers.
A. two
B. three
C. four
D. five

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