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Electronics and Communication Engineering - Analog Electronics

Exercise : Analog Electronics - Section 3
11.
In figure the zener current
is always 130 mA
may vary between 10 mA and 130 mA
may vary between 60 mA and 130 mA
is always equal to 65 mA
Answer: Option
Explanation:

When IL = 0, Zener current = 130 mA, when IL = 120 mA, zener current (t = 10 mA).

12.
In a commercially available good power supply the voltage regulation is about
1%
5%
10%
20%
Answer: Option
Explanation:

A good power supply does not allow output voltage to vary by more than 1% .

13.
In the circuit of figure the diode
will conduct as the whole cycle
will conduct in the positive half cycle
will not conduct
will conduct from 30° to 150° in the positive half cycle
Answer: Option
Explanation:

Diode will always be reverse biased.

14.
The most commonly used bias in BJT amplifier circuits is
voltage divider bias
emitter bias
collector bias
collector feedback bias
Answer: Option
Explanation:

Voltage divider bias stabilizes IC.

15.
In the circuit of figure, v1 = v2 = 10 V. Then
I1 = I2
I1 > I2
I2 > I1
I1 = 0
Answer: Option
Explanation:

Current in diode D2 will be more because resistance in series with D2 is less.

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