Characteristic Curves of a Zener Diode and Finding Reverse Break Down Voltage NEET Questions

Physics - Experimental Skills

Characteristic Curves of a Zener Diode and Finding Reverse Break Down Voltage MCQ Questions


7.
In forward bias, a Zener diode behaves:
A.
Like an open circuit
B.
Like a Zener regulator
C.
Like an ordinary diode (cut-in voltage ~0.7 V for Si)
D.
Like a short circuit
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ANSWER :
C. Like an ordinary diode (cut-in voltage ~0.7 V for Si)
8.
The symbol of a Zener diode differs from an ordinary diode by:
A.
An extra triangle
B.
A circle around it
C.
The cathode bar has bent edges (zigzag) to indicate Zener behaviour
D.
Three terminals
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ANSWER :
C. The cathode bar has bent edges (zigzag) to indicate Zener behaviour
9.
In the V-I curve of a Zener diode, the breakdown region (reverse) shows:
A.
A nearly vertical line (sharp rise in current with small change in V)
B.
A diagonal at 45°
C.
A horizontal line
D.
A flat line
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ANSWER :
A. A nearly vertical line (sharp rise in current with small change in V)
10.
Typical Zener voltage values (V_Z) range from:
A.
10000 V to 100000 V
B.
Always exactly 5 V
C.
About 2 V to 200 V (commercial Zener diodes)
D.
0.1 V to 1 V
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ANSWER :
C. About 2 V to 200 V (commercial Zener diodes)
11.
There are two main mechanisms of reverse breakdown in p-n junctions:
A.
Just electrical breakdown
B.
Just thermal breakdown
C.
Just optical breakdown
D.
Zener breakdown (low V_Z, tunneling) and avalanche breakdown (high V_Z, carrier multiplication)
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ANSWER :
D. Zener breakdown (low V_Z, tunneling) and avalanche breakdown (high V_Z, carrier multiplication)
12.
Zener breakdown occurs in:
A.
Just any junction
B.
Forward biased junctions
C.
Lightly doped junctions
D.
Heavily doped junctions with narrow depletion regions
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ANSWER :
D. Heavily doped junctions with narrow depletion regions