Exercise: Exam Question Papers

Questions for: Exam Question Papers

(2)3 + (3)4 = (?)5
A:
4
B:
11
C:
none of these
D:
not possible
Answer: C

(2)3 + (3)4 = 2 + 3 = 5 and (10)5 = 51 + 0 = 5

∴ (2)3 + (3)4 = (10)5 .

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If we manage to __________ our natural resources, we would leave a better planet for our children.
A:
uphold
B:
restrain
C:
Cherish
D:
conserve
Answer: D

The clue in this sentence is 'If we manage to __________ our natural resources' and 'better planet'.

This implies that the blank should be filled by a word which means 'preserve' or 'keep for long time'.

Therefore the word 'conserve' is the right answer.

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A n-channel JFET has IDSS = 2 mA, Gate to source voltage VGS = - 2 V and trans-conductance is 0.5 mW then pinch-off voltage is __________ .
A:
- 2 V
B:
2 V
C:
- 4 V
D:
4 V
Answer: C

∴

∴ = - 8VP - 16

∴ + 8VP + 16 = 0

∴ (VP + 4)2 = 0

∴ VP = -4 V.

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The amplifier circuit shown below uses a silicon transistor. The capacitors Cc and CE can be assumed to be short at signal frequency and the effect of output resistance r0 can be ignored. If CE is disconnected from the circuit, which one of the following statements is TRUE?
A:
The input resistance Ri increases and the magnitude of voltage gain Av decreases
B:
The input resistance Ri decreases and the magnitude of voltage gain Av decreases
C:
Both input resistance Ri and the magnitude of voltage gain Av decrease
D:
Both input resistance Ri and the magnitude of voltage gain Av increase
Answer: A

Given circuit after removing CE will behave as current-series feedback.

Overall voltage gain will decrease as feedback signal comes into picture and since it is current-series feedback, input impedance increases.

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The amplitude of a pair of composite sinusoidal signal y(n) = x1(n) + x2(n) with x1(n) = sin (5pn) x2(n) = 3 sin (5pn) is __________ .
A:
2
B:
3
C:
4
D:
1
Answer: A

Amplitude = .

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