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


13.
Zener breakdown is a quantum mechanical phenomenon involving:
A.
Heat
B.
Just classical conduction
C.
Tunneling of electrons through the energy band gap (thin depletion region)
D.
Magnetism
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ANSWER :
C. Tunneling of electrons through the energy band gap (thin depletion region)
14.
Avalanche breakdown occurs in:
A.
All junctions equally
B.
Only forward biased
C.
Heavily doped junctions
D.
Lightly doped junctions with wider depletion regions
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ANSWER :
D. Lightly doped junctions with wider depletion regions
15.
Avalanche breakdown is described as:
A.
Multiplication of carriers via impact ionization of lattice atoms
B.
Just thermal effect
C.
Magnetic effect
D.
Quantum tunneling only
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ANSWER :
A. Multiplication of carriers via impact ionization of lattice atoms
16.
The dominant breakdown mechanism for Zener diodes with V_Z below approximately 5 V is:
A.
Neither
B.
Zener breakdown (tunneling)
C.
Both equally
D.
Avalanche breakdown
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ANSWER :
B. Zener breakdown (tunneling)
17.
The dominant breakdown mechanism for Zener diodes with V_Z above approximately 7 V is:
A.
Zener breakdown (tunneling)
B.
Neither
C.
Both equally
D.
Avalanche breakdown
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ANSWER :
D. Avalanche breakdown
18.
Temperature coefficient of Zener voltage is:
A.
Always positive
B.
Always zero
C.
Negative for Zener breakdown (V_Z decreases with T) and positive for avalanche (V_Z increases with T)
D.
Always negative
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ANSWER :
C. Negative for Zener breakdown (V_Z decreases with T) and positive for avalanche (V_Z increases with T)