Explore topic-wise MCQs in Analog Circuits.

This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Analog Circuits knowledge and support exam preparation. Choose a topic below to get started.

1.

Capacitance per unit area at no reverse bias is 2 pF/cm2. For a step graded diode of area 5cm2, what is net capacitance at 99 V reverse bias voltage?

A. 2pF
B. 5pF
C. 0.1pF
D. 1pF
Answer» E.
Discussion
2.

The transition capacitance depends on the forward current of the diode.

A. True
B. False
Answer» C.
Discussion
3.

Consider 2 reverse biased diodes. If the ratio of applied reverse bias voltages is 0.5, find the ratio of transition capacitances of the 2 diodes.

A. 2
B. 4
C. 1.31
D. 2.6
Answer» D. 2.6
Discussion
4.

Consider two diodes, A is step graded, B is linear graded. Find the ratio of the capacitance of A to B, when the applied voltage in reverse bias is 64V.

A. 0.2
B. 2
C. 0.5
D. 5
Answer» E.
Discussion
5.

Which of these is the odd one in the choices?

A. Transition capacitance
B. Diffusion capacitance
C. Space charge capacitance
D. Depletion layer capacitance
Answer» C. Space charge capacitance
Discussion
6.

A diode had a transition capacitance of 1pF and depletion width of 1 m. The capacitance changes to 10 pF when the depletion width changes. The final depletion width is __________

A. 10 m
B. 0.1 m
C. 1 m
D. 100 m
Answer» C. 1 m
Discussion
7.

A diode is replaced with another diode of different material. The ratio of relative permittivity of new material to old is 0.5. The initial capacitance was 20pF, then final capacitance will be __________

A. 15pF
B. 20pF
C. 10pF
D. 2pF
Answer» D. 2pF
Discussion
8.

For a diode the transition capacitance was 10pF. The depletion width changed from 1 m to 10 m. All other conditions remain unchanged. The new diode capacitance is __________

A. 5pF
B. 1.414pF
C. 1pF
D. 10pF
Answer» D. 10pF
Discussion