Analog Electronics - Study Mode

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[#316] If a common emitter amplifier with an emitter resistance R e has an overall trans-conductance gain of -1 mA/V, a voltage gain of -4 and desensitivity of 50, then the value of the emitter resistance R e would be:

(A) 50 Ω

(B) 0.98 kΩ

(C) 50 kΩ

(D) 0.98 Ω

Correct Answer

(B) 0.98 kΩ

[#317] For the transistor amplifier in the given figure, the voltage amplification is approximately.

(A) 100

(B) 84

(C) 0.723

(D) -2

Correct Answer

(D) -2

[#318] In the circuit shown below, if R C = 10 kΩ, R L = 10 kΩ, β = 100, input signal voltage is 1 mV r.m.s. The output voltage is:

(A) 100 V

(B) 150 V

(C) 250 V

(D) 350 V

Correct Answer

100 V

[#319] RC oscillator is basically a-

(A) Square wave generator

(B) Pulse generator

(C) Sinusoidal wave generator

(D) Triangular wave generator

Correct Answer

(C) Sinusoidal wave generator

[#320] In an amplifier the increase in gain is 12 dB if the frequency is doubled. What will be the gain if frequency is increased 10 times?

(A) 20 dB

(B) 40 dB

(C) 2.4 dB

(D) 60 dB

Correct Answer

(B) 40 dB