Exam Papers Questions

1 follower study24x7

22 Aug 2024 11:05 AM study24x7

A n-channel JFET has IDSS = 2 mA, Gate to source voltage VGS = - 2 V and trans-conductance is 0.5 mW then pinch-off voltage is __________ .

A

- 2 V

B

2 V

C

- 4 V

D

4 V

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1 follower study24x7

21 Aug 2024 10:50 AM study24x7

The amplifier circuit shown below uses a silicon transistor. The capacitors Cc and CE can be assumed to be short at signal frequency and the effect of output resistance r0 can be ignored. If CE is disconnected from the circuit, which one of the following ...

A

The input resistance Ri increases and the magnitude of voltage gain Av decreases

B

The input resistance Ri decreases and the magnitude of voltage gain Av decreases

C

Both input resistance Ri and the magnitude of voltage gain Av decrease

D

Both input resistance Ri and the magnitude of voltage gain Av increase

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1 follower study24x7

21 Aug 2024 10:48 AM study24x7

The amplitude of a pair of composite sinusoidal signal y(n) = x1(n) + x2(n) with x1(n) = sin (5πn) x2(n) = √ 3 sin (5πn) is ________ .

A

2

B

3

C

4

D

1

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1 follower study24x7

21 Aug 2024 10:40 AM study24x7

Consider the probability density (x) = ae-b|x| where x is a random variable whose allowable values range from x = - ∞ to x = + ∞. P(1 ≤ x ≤ 2)

A

B

C

D

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1 follower study24x7

20 Aug 2024 01:14 PM study24x7

The ratio of the diffusion coefficient in a semiconductor has the units

A

V-1

B

em.V-1

C

V.cm-1

D

V.s

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1 follower study24x7

20 Aug 2024 01:13 PM study24x7

A TV picture is to be transmitted over a channel of 6 MHz bandwidth at a 35 dB S/N ratio. The capacity of the channel is

A

50 Mbps

B

100 Mbps

C

36 Mbps

D

72 Mbps

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1 follower study24x7

20 Aug 2024 01:12 PM study24x7

Denominator polynomial of a transfer function of certain network is:
s3 + s2&nb...

A

stable

B

oscillatory

C

unstable

D

depends on numerator polynomial

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1 follower study24x7

16 Aug 2024 01:14 PM study24x7

For a given voltage, four heating coils will produce maximum heat when connected

A

all in parallel

B

all in series

C

with two parallel pairs in series

D

one pair in parallel with the other two in series

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1 follower study24x7

16 Aug 2024 01:13 PM study24x7

The specific gravity of tungsten is 13.8 and its atomic weight is 184.0 Assume that there are two free elements per atom. Then the Fermi level or characteristic energy for the crystal in eV will be

A

8.95 eV

B

-8.95 eV

C

7.326 eV

D

-7.326 eV

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1 follower study24x7

14 Aug 2024 11:48 AM study24x7

A noiseless 3 KHz channel can transmit binary at the rate _________ .

A

12000 bps

B

10000 bps

C

6000 bps

D

3000 bps

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1 follower study24x7

14 Aug 2024 11:47 AM study24x7

The antenna current of an AM transmitter is 8 A, when only the carrier is sent, but it increases to 8.93 A when the carrier is modulated by a single sine wave. Determine the antenna current when the percent of modulation changes to 0.8

A

9.19 A

B

9.91 A

C

10.56 A

D

8.61 A

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1 follower study24x7

14 Aug 2024 11:46 AM study24x7

The analog signal given below is sampled at 1200 samples per second. m(t) = 2 sin 120 πt + 3 sin 240 πt + 4 sin 360 πt + 5 sin 480 πt + 6 sin 600 πt + 7 sin 720 πt. The folding (maximum) frequency is _________.

A

300 Hz

B

360 Hz

C

600 Hz

D

480 Hz

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1 follower study24x7

13 Aug 2024 11:14 AM study24x7

Consider a unity feedback control system with open-loop transfer function G(s) = k/s(s+1) The steady state error of the system due to a unity step input is :

A

zero

B

K

C

1/K

D

infinite

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1 follower study24x7

13 Aug 2024 11:13 AM study24x7

During transmission over a communicate channel, bit errors occur independently with probability 1/2 . If a block of 3 bits are transmitted, the probability of at most one bit error is equal to

A

7/8

B

3/2

C

3/2√ 2

D

none

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1 follower study24x7

13 Aug 2024 11:09 AM study24x7

In a flash type ADC, employing 15 comparators resolution with 10 volts reference; is expected to be :

A

0.625 V

B

0.656 V

C

0.525 V

D

insufficient data

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1 follower study24x7

09 Aug 2024 09:59 AM study24x7

The gradient of any scalar field always yields __________ .

A

a solenoidal field

B

a conservative field

C

an irrotational field

D

none of these

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1 follower study24x7

09 Aug 2024 09:56 AM study24x7

When phase-lag compensation is used in a system, then gain cross over frequency, bandwidth and undamped frequency are respectively

A

Increased, Increased, Increased

B

Increased, Increased, Decreased

C

Increased, Decreased, Decreased

D

Decreased, Decreased, Decreased

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1 follower study24x7

09 Aug 2024 09:56 AM study24x7

Consider the following
1. Maximum energy of electrons liberated photoelectrically is independent of light intensity
2. Maximum energy of electrons liberated photoelectrically varies nonlinearly with frequency of incident light.

A

(1) is true and (2) is false

B

(1) and (2) both are true

C

(1) is false and (2) is true

D

(1) and (2) both are false

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1 follower study24x7

08 Aug 2024 10:52 AM study24x7

As the temperature increases the mobility of electrons ________ .

A

decreases because the number of carries increases with increased collisions

B

increases because the number of carries decreases with decreased collisions

C

remains same

D

none of the above

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1 follower study24x7

08 Aug 2024 10:51 AM study24x7

What are the values of Emax and Emin displayed on the oscilloscope, when a 1 kV P-P carries is modulated to 50%?

A

2 kV, 0.5 kV

B

1 kV, 0.5 kV

C

0.75 kV, 0.25 kV

D

0.5 kV, 1.5 kV

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