In the op-amp circuit of figure, V0 = Vi 3 Vi 5 Vi 0.5 Vi .

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Correct Answer

5 V_i

Explanation

In the op-amp circuit of figure, V0 = Vi 3 Vi 5 Vi 0.5 Vi .

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1. If an amplifier with gain of - 1000 and feedback factor ? = - 0.1 had a gain change of 20% due to temperature, the change in gain of the feedback amplifier would be
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A. 10%
B. 5%
C. 0.2%
D. 0.01%

2. An amplifier has a large ac input signal. The clipping occurs on both the peaks. The output voltage will be nearly a
Options
A. sine wave
B. square wave
C. triangular wave
D. (a) or (c)

3. In a BJT circuit a pnp transistor is replaced by npn transistor. To analyse the new circuit
Options
A. all calculations done earlier have to be repeated
B. replace all calculated voltages by reverse values
C. replace all calculated currents by reverse values
D. replace all calculated voltages and currents by reverse values

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A. 0.3
B. 0.4
C. 0.6
D. none

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A. 10 V and 4 k ohm
B. 5 V and 4 k ohm
C. 2 V and 4 k ohm
D. 2 V and 10 k ohm

6. To protect the diodes in a rectifier and capacitor input filter circuit it is necessary to use
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A. surge resistor
B. surge inductor
C. surge capacitor
D. both (a) and (b)

7. In figure v₁ = 8 V and v₂ = 4 V. Which diode will conduct?
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A. D₂ only
B. D₁ only
C. Both D₁ and D₂
D. Neither D₁ nor D₂

9. A half wave diode rectifier has a capacitance input filter. If input voltage is V_m sin ?t, PIV is
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A. V_m
B. 2 V_m
C. 3 V_m
D. 4 V_m

10. The efficiency of a full wave rectifier using centre tapped transformer is twice that in full wave bridge rectifier.
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A. True
B. False

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