Exercise: Exam Question Papers

Questions for: Exam Question Papers

A bipolar differential amplifier uses a transistor having Ī²0 = 200, ICQ = 100 mA, |Adm| = 500 and CMRR = 80 dB. The value of Rc and RE will be respectively __________ .
A:
1.25 kĪ©, 1.25 MĪ©
B:
125 kĪ©, 1.25 MĪ©
C:
1.25 MĪ©, 1.25 kĪ©
D:
3.25 kĪ©, 3.25 MĪ©
Answer: A

80 = 20 log CMRR

āˆ“ CMRR = 10000

But CMRR = 2gmRE

āˆ“ = 1.25 MĪ©

Adm = - gmRC

= 1.25 KĪ©.

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If the transfer function of the following network is

The value of the load resistance RL is
A:
R/4
B:
R/2
C:
R
D:
2R
Answer: C

.

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The function shown in figure, can represent a probability density function for A __________
A:
A = 1/4
B:
A = 1/6
C:
A = 1/9
D:
A = 1/2
Answer: C

The condition for the probability density function d(x) isand is always non negative or the area under the curve f(x)is unity.

=> A x 6 +x 2 x 3A = 1

or 9A = 1 or A =.

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Find the power absorbed or delivered by each source:
A:
a = -32 b = - 12 c = -80 d = -60
B:
a = -32 b = - 12 c = 80 d = 60
C:
a = 32 b = 12 c = -80 d = 60
D:
a = -32 b = 12 c = 80 d = -60
Answer: D

Source a : Power : 8 x (4) = - 32 W. Source A has delivered the power as it is. - ve.

Source b: Source B has absorbed power of + 12 W as power is positive

Source c: Source C has absorbed power of 5 x 16 = 80 W

Source d: Delivers power of 3 x ix x (5) = 3 x 4 x (- 5) = -60 W

Total power of the network is - 32 + 12 + 80 - 60 = 0 Watts.

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A Ī»/4 long high frequency transmission line is terminated into one impedance ZR. If Z0 be the characteristic impedance of the line, then input impedance Zin is
A:
ZoZR
B:
Z2R/Zo
C:
Z20/ZR
D:
Infinity
Answer: C

, here and

āˆ“ [Here ZL = ZR].

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