1
MCQ (Single Correct Answer)

AIPMT 2007

In the following circuit, the output Y for all possible inputs A and B is expressed by the truth table.

A
$$\matrix{ A & B & Y \cr 0 & 0 & 1 \cr 0 & 1 & 1 \cr 1 & 0 & 1 \cr 1 & 1 & 0 \cr } $$
B
$$\matrix{ A & B & Y \cr 0 & 0 & 1 \cr 0 & 1 & 0 \cr 1 & 0 & 0 \cr 1 & 1 & 0 \cr } $$
C
$$\matrix{ A & B & Y \cr 0 & 0 & 0 \cr 0 & 1 & 1 \cr 1 & 0 & 1 \cr 1 & 1 & 1 \cr } $$
D
$$\matrix{ A & B & Y \cr 0 & 0 & 0 \cr 0 & 1 & 0 \cr 1 & 0 & 0 \cr 1 & 1 & 1 \cr } $$

Explanation

Y' = $$\overline {A + B} $$

Y = $$\overline {Y'} $$

Y = $$\overline{\overline {A + B}} $$

Y = A + B which is OR-gate.
2
MCQ (Single Correct Answer)

AIPMT 2007

Which one of the following represents forward bias diode ?
A
B
C
D

Explanation

A diode is said to be forward biased if p-side is at higher potential than n-side of p-n junction.
3
MCQ (Single Correct Answer)

AIPMT 2006

Which one of the following represents forward bias diode ?
A
B
C
D

Explanation

A diode is said to be forward biased if p-side is at higher potential than n-side of p-n junction.
4
MCQ (Single Correct Answer)

AIPMT 2006

A transistor is operated in common emitter configuration at constant collector voltage VC = 1.5 V such that a change in the base current from 100 $$\mu $$A to 150 $$\mu $$A profuces a change in the collector current from 5 mA to 10 mA. The current gain $$\beta $$ is
A
50
B
67
C
75
D
100

Explanation

Current gain, $$\beta $$ = $${{\Delta {I_C}} \over {\Delta {I_B}}}$$

= $${{\left( {10 - 5} \right) \times {{10}^{ - 3}}} \over {\left( {150 - 100} \right) \times {{10}^{ - 6}}}}$$ = 100

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