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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 1
11.
In figure The minimum and maximum load currents are
0 and 60 mA
0 and 120 mA
10 mA and 60 mA
10 mA and 120 mA
Answer: Option
Explanation:

When RL = ∞, IL = 0,

When RL = 100 Ω, or 120 mA.

12.
In figure, VEB = 0.6 V, β = 99. Then VC and IC are
9.3 V and 1.98 mA respectively
4.6 V and 1.98 mA respectively
9.3 V and 0.02 mA respectively
4.6 V and 0.02 mA respectively
Answer: Option
Explanation:

VC = 20 - 1.98 x 10-3 x 5.4 x 103 9.3 V.

13.
The input impedance of op-amp circuit of figure is
120 k ohm
110 k ohm
infinity
10 k ohm
Answer: Option
Explanation:

Due to the presence of virtual ground at input, the resistance in the series path of input of inverting amplifier is input impedance.

14.
In a BJT circuit a pnp transistor is replaced by npn transistor. To analyse the new circuit
all calculations done earlier have to be repeated
replace all calculated voltages by reverse values
replace all calculated currents by reverse values
replace all calculated voltages and currents by reverse values
Answer: Option
Explanation:

All voltages and currents have reverse polarity.

15.
To protect the diodes in a rectifier and capacitor input filter circuit it is necessary to use
surge resistor
surge inductor
surge capacitor
both (a) and (b)
Answer: Option
Explanation:

Resistor reduces surge current.

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