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BARC Quiz 16

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Question 1

A silicon PN junction diode has reverse saturation current of 10

. The temperature at which the forward current of silicon diode is 1.174 A, for the applied forward voltage of 0.6 V is. (Assume

= 2 for Si diode)

Question 2

The percent change in the closed loop gain A_f when the change in the open – loop gain is dA = 10⁴, A = 10⁵, A_f = 50 and β= 0.01999 .

Question 3

In a homogeneously doped P type S.C bar electrons are injected at one end then how will they flow to other end?

Question 4

Which one of the following statement is wrong at a balanced condition in any type of bridge circuit?

Question 5

The output frequency for the circuit shown is (use V_sat =

13V)

Question 6

For realizing a binary half-subtractor having two inputs A and B, the correct set of logical expressions for the outputs D (A minus B) and X(borrow) are
1) The difference output

2) The borrow output

Which of the above statements is/are correct?

Question 7

The built-in potential of an abrupt p-n junction is 0.75 V. If its junction capacitance (C_J) at a reverse bias (V_R) of 1.25 V is 5 pF, the value of C_J (in pF) when V_R = 7.25 V is________.

Question 8

Consider the following statements regarding a PID controller:
1) The error is multiplied by a negative (for reverse action) proportional constant P, and added to the current output.
2) The error is integrated (averaged) over a period of time, and then divided by a constant I, and added to the current control output.
3) The rate of change of the error is calculated with respect to time multiplied by another constant D, and added to the output.
Which of the above statements are correct?