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ISRO Electronics Engg. : Electronic Devices & Circuits Booster Quiz 4

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Question 1

The conductivity of the intrinsic germanium at 300 °K is ___________ When ni at 300 °K is 2.5 X 1013/ cm3 where μn and μp in germanium are 3800 and 1800 cm2/V-s respectively.

Question 2

A 24 V, 600 mW Zener is to be used for providing a 24 V stabilized supply to a variable load. Assume that for proper Zener action, a minimum of 10 mA must flow through the Zener. If the input voltage is 32 V, what would be the value of R and the maximum local current?

Question 3

In the circuit given below, assume that Vcc= 15V; Z1, Z2, Z3 & Z4 are identical zener diodes with breakdown voltage of 5V; R1= R4 = 5kΩ, R2=R3=10kΩ.Find Vo when Q1 is OFF.

Question 4

A 24 V, 600 mW, Zener diode is to be used for providing a 24 V stabilized supply to a variable load. Assume that for proper Zener action, a minimum of 10 mA must flow through the Zener. If the input voltage is 32 V, what would be the value of R and the maximum load current ?

Question 5

The output voltage (v0) of the circuit shown in the given figure is
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Nov 20ESE & GATE EC