Semiconductors - General Questions (2)

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Semiconductors - General Questions

For a transmission line open circuit and short circuit impedances are 20 Ω and 5 Ω. Then characteristic impedance is

A.	100 Ω
B.	50 Ω
C.	25 Ω
D.	10 Ω

Answer: Option D

Explanation:

Z₀ = √Z_oc Z_sc .

10.

and i(t) is a unit step, then V(t) in the steady state is given by

A.	4/9
B.	4/3
C.	0
D.	∞

Answer: Option

Explanation:

= 4/9.

11.

The driving-point impedance Z(s) of a network has a pole-zero locations as shown in the figure. If Z(0) = 3, then Z (s) is

140-968-11

A.
B.
C.
D.

Answer: Option B

Explanation:

From figure, The impedance function

172-968-11

and Z(0) = 172-968-21 while in question Z(0) = 3

1-sym-imp1 172-968-21 = 3k = 2.

12.

When a current source I is suddenly connected across a two terminal relaxed RC circuit at time t = 0, the voltage across the current source is shown in figure. The RC circuit is.

A.	a series combination of R and C
B.	a parallel combination of R and C
C.	a series combination of R and parallel combination of R and C
D.	a pure capacitor

Answer: Option C

Explanation:

Initially capacitor behaves as short-circuit and finally as open circuit.

13.

In a minimum function

A.	the degree of numerator and denominator are equal
B.	the degree of numerator and denominator are unequal
C.	the degree of numerator is one more than degree of denominator
D.	the degree of numerator is one less than degree of denominator

Answer: Option A

Explanation:

If degrees of numerator and denominator were unequal, a pole or zero can be removed. Such a function cannot be a minimum function. Therefore degrees of numerator and denominator must be equal.

14.

Henry is equivalent to

A.	Volts/Ampere
B.	Weber/Volt
C.	Weber/Ampere
D.	Weber/Ampere2

Answer: Option C

Explanation:

Inductance is flux per ampere.

15.

An RLC series circuit is underdamped. To make it overdamped, the value of R

A.	has to be increased
B.	has to be decreased
C.	has to be increased to infinity
D.	has to be reduced to zero

Answer: Option A

Explanation:

For overdamping R is more.

16.

A.	about 95 V
B.	about 80 V
C.	about 50 V
D.	about 25 V

Answer: Option B

Explanation:

163-422-11

Semiconductors - General Questions (2)

Semiconductors - General Questions

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