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Semiconductor Diode NAT Level - 2


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10 Questions MCQ Test Topic wise Tests for IIT JAM Physics | Semiconductor Diode NAT Level - 2

Semiconductor Diode NAT Level - 2 for IIT JAM 2022 is part of Topic wise Tests for IIT JAM Physics preparation. The Semiconductor Diode NAT Level - 2 questions and answers have been prepared according to the IIT JAM exam syllabus.The Semiconductor Diode NAT Level - 2 MCQs are made for IIT JAM 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Semiconductor Diode NAT Level - 2 below.
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*Answer can only contain numeric values
Semiconductor Diode NAT Level - 2 - Question 1

Calculate form factor of halfwave rectifier ?


Detailed Solution for Semiconductor Diode NAT Level - 2 - Question 1

The ratio of rms value to the average value is called form factor. Thus,
form factor 

Half-Wave Rectifier - circuit diagram - Ripple factor - Form  Factor-Transformer utilisation factor - ELECTRICAL SIMPLE

The correct answer is: 1.57

*Answer can only contain numeric values
Semiconductor Diode NAT Level - 2 - Question 2

Calculate the zener current in the given circuit in mA?


Detailed Solution for Semiconductor Diode NAT Level - 2 - Question 2


and  
Now 130-60 = IR

Now, Vz = lLRL

Iz = 2mA

The correct answer is: 2

*Answer can only contain numeric values
Semiconductor Diode NAT Level - 2 - Question 3

A 24V, 600mW, zener diode is to be used in for providing a 24 Vstabilized supply to variable load.

Assuming for a proper zener action, a minimum of 10mA must flow through the zener. If the input voltage is 32 V. What would be the value of RL (in ohm).


Detailed Solution for Semiconductor Diode NAT Level - 2 - Question 3



The correct answer is: 320

*Answer can only contain numeric values
Semiconductor Diode NAT Level - 2 - Question 4

What is the potential difference across R1 (in volts) ?


Detailed Solution for Semiconductor Diode NAT Level - 2 - Question 4

D2 is reverse biased, hence, no current flow through it.
6 - iR2 - iR1=0

Now potential difference across R
= 2V
The correct answer is: 2

*Answer can only contain numeric values
Semiconductor Diode NAT Level - 2 - Question 5

The 6 Volts zener diode shown in figure has zero zener resistance and knee current of 5mA. The minimum value of R (in Ω), so that the voltage across it does not fall below 6 Volts is ?


Detailed Solution for Semiconductor Diode NAT Level - 2 - Question 5


The correct answer is: 80

*Answer can only contain numeric values
Semiconductor Diode NAT Level - 2 - Question 6

Calculate the diffusion current density when the concentration of electron varies from the 1 * 1018 to 7 * 1017 cm-3 over a distance of 0.10 cm. D = 225cm2/s


Detailed Solution for Semiconductor Diode NAT Level - 2 - Question 6

J = eDdn / dx
J = 1.6 * 10-19 * 225 * (1018 - (7 * 1017)) / 0.1
= 108A/cm2.

*Answer can only contain numeric values
Semiconductor Diode NAT Level - 2 - Question 7

The centre tap full-wave single phase rectifier circuit uses 2 diodes as shown in the given figure. The rms voltage across each diode is (in Volts)


Detailed Solution for Semiconductor Diode NAT Level - 2 - Question 7

Peak inverse voltage (PIV) across each diode =when diode is conducting (during half cycle) the voltage across the diode is zero.
Hence, rms value of voltage across the diode =
The correct answer is: 339.4

*Answer can only contain numeric values
Semiconductor Diode NAT Level - 2 - Question 8

A half-wave rectifier employs a transformer with turn ratio n1 : n= 12 : 1. If primary coil is connected to the power mains 220V, 50Hz. If the diode resistance in forward bias is negligible, what is the peak inverse voltage (in Volts) of the diode?


Detailed Solution for Semiconductor Diode NAT Level - 2 - Question 8

The turn ratio of transform ation is 12:1. So if primary coil is connected to power mains o f 220V , then potential of secondary coil is Volts. In a half-wave rectifier,is the maximum voltage appearing across the transformer secondary coil. Now. peak inverse voltage, for half wave rectifier in given as V0

= 25.9V
The correct answer is: 25 .9

*Answer can only contain numeric values
Semiconductor Diode NAT Level - 2 - Question 9

A 10V zener diode working as a voltage regulator operates from a source that varies from 5 V to 15V, the series resistance is 0.1kΩ and the load draws a current that varies from 0 to 20mA. The power dissipation in the zener diode under worst case (in Watts) is?


Detailed Solution for Semiconductor Diode NAT Level - 2 - Question 9


 For maximum power dissipation, current through zener diode should be maximum which is maximum when total current in the circuit is maximum i.e. Vs = 15V.


The correct answer is: 0.5

*Answer can only contain numeric values
Semiconductor Diode NAT Level - 2 - Question 10

When three zener diodes of identical specification having 10W, 10 V, l000 mA are connected in series to a 45V~dc power supply. Calculate the series resistance required to obtain 30 V regulated output (in Ω)?


Detailed Solution for Semiconductor Diode NAT Level - 2 - Question 10

Power of each diode = 10W
Potential = 10
⇒ current = 1A
⇒ Resistance of each zener diode R  
⇒ Equivalent resistance of three diodes connected in series

The correct answer is: 15

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