# Electronic Devices and Circuits Questions and Answers – Diode Circuits

This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Diode Circuits”.

1. For the given circuit and input waveform determine the output waveform.

a)

b)

c)

d)

Explanation: Diode is off when Vi < 5 and for Vi > 5, Vo = 5V.

2. Find the output waveform from the given circuit and input waveform.

a)

b)

c)

d)

Explanation: Diode is off when Vi + 2 > 0.

3. Determine the output waveform from the given circuit and input waveform.

a)

b)

c)

d)

Explanation: For V1 < 4 the diode is on otherwise its off.

4.
a)

b)

c)

d)

Explanation: During +ve half cycle when Vi < 8 both the diodes are off. For V1 > 8, D1 is on. Similarly for the negative half cycle.

5. The maximum load current that can be drawn is

a) 1.4 mA
b) 2.3 mA
c) 1.8 mA
d) 2.5 mA

Explanation: At regulated poer supply, Is = 30-9/15k or 1.4 mA. The load current will remain less than this current.
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6. For the circuit shown diode cutting voltage is Vin = 0. The ripple voltage is to be no more than vrip = 4 V. The minimum load resistance, that can be connected to the output is (in kilo ohm)

a) 6.25
b) 12.5
c) 25
d) 30

Explanation:

7. The circuit inside the box in fig. P3.1.31. contains only resistor and diodes. The terminal voltage vo is connected to some point in the circuit inside the box. The largest and smallest possible value of vo most nearly to is respectively

a) 15 V, 6 V
b) 24 V, 0 V
c) 24 V, 6 V
d) 15 V, 9 V

Explanation: The output voltage cannot exceed the positive power supply voltage and cannot be lower than the negative power supply voltage.

8. The Q-point of the zener diode in the circuit shown below is

a) (0.34 mA, 4 V)
b) (0.34 mA, 4.93 V)
c) (0.94 mA, 4 V)
d) (0.94 mA, 4.93 V)

Explanation:

Sanfoundry Global Education & Learning Series – Electronic Devices and Circuits.