Analog Electronics - Study Mode

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[#166] The transistor shunt regulator shown in the figure has a regulated output voltage of 10 V, when the input varies from 20 V to 30 V. The relevant parameters for the zener diode and the transistor are: V Z = 9.5, V BE = 0.5 V, β = 99. Neglect the current through R B . Then the maximum power dissipated in the zener diode (P Z ) and the transistor (P T ) are

(A) P Z = 75 mW, P T = 7.9 W

(B) P Z = 85 mW, P T = 8.9 W

(C) P Z = 95 mW, P T = 9.9 W

(D) P Z = 115 mW, P T = 11.9 W

Correct Answer

(C) P Z = 95 mW, P T = 9.9 W

[#167] The following configuration is an example of positive feedback system:

(A) Inverting amplifier

(B) Non-inverting amplifier

(C) Schmitt trigger

(D) None of these

Correct Answer

(C) Schmitt trigger

[#168] Barkhausen criterion is related to

(A) Filter

(B) Amplifier

(C) Oscillator

(D) None of these

Correct Answer

(C) Oscillator

[#169] When L is doubled and C is halved, the frequency of oscillation is?

(A) Doubled

(B) Halved

(C) One quarter

(D) Unchanged

Correct Answer

(D) Unchanged

[#170] If the OP-AMP shown in the figure below is ideal, then the output voltage V out will be equal to

(A) 17 V

(B) 1 V

(C) 6 V

(D) 14 V

Correct Answer

(C) 6 V