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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 2
36.
The dissipation at the collector is in the quiescent state and increases with excitation in the case of a
class A series fed Amplifier
class A transistor coupled Amplifier
class AB amplifier
class B amplifier
Answer: Option
Explanation:

Only one transistor conducts without biasing.

37.
In following circuit, RB will be if VCC = 10 V, VS = 2 V, RC = 5 kΩ, RS = 90 kΩ, β = 50, ICE = 0, VCEsat = 0.1 V
230 K
235 K
240 K
250 K
Answer: Option
Explanation:

By making capacitor blocked, Is = 0, and applying KVL

By considering Si Transistor.

38.
The open loop gain of an ideal op-amp is
infinite
very high
neither high nor low
low
Answer: Option
Explanation:

An ideal op-amp has infinite open loop gain.

39.
In following figure, what will be R1 and R2 for maximum symmetrical swing if VCSat ≈ 0. Given that RE = 200 Ω, RC = 400 Ω, VCC = 20 V, β = 99
6 k
3 k, 6 k
9.9 k, 2.4 k
2.4 k, 9.9 k
Answer: Option
Explanation:

The quiescent collector current for maximum symmetrical swing.

In standard consideration, a factor of 10 used as the margin of inequality for β independence. Then,

VBB = VBEQ + ICQ . RE

0.7 + 16.66 x 10-3 x 200 = 4 V

40.
The ideal characteristics of a stabilizer is
constant output voltage with low internal resistance
constant output current with low internal resistance
constant output voltage with high internal resistance
constant internal resistance and constant output current
Answer: Option
Explanation:

A stabilizer must give constant output voltage. This is possible only if internal resistance is low.

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