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BARC ECE 2019 : Mini Mock 4

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Question 1

Lifetime of an electric bulb is a random variable with density f(x) = kx2 where x is measured in years. If the minimum and maximum lifetimes of bulb are 1 and 2 years respectively, then the value of k is ________.

Question 2

The building block shown in fig. is a active high output decoder.

The output X is

Question 3

A semiconductor (either Si or Ge) diode is carrying a steady current of 2 mA. The voltage across the diode VD is 800 mV when the diode’s temperature is 250C. If the diode’s temperature is further increased to 50 0C, then VD at this increased temperature will be equal to

Question 4

Two silicon diodes, with a forward voltage drop of 0.7 V, are used in the circuit shown in the figure. The range of input voltage for which the output voltage

Question 5

The output signal-to-quantization-noise ratio of a 10-bit PCM was found to be 30 dB. The desired SNR is 42 dB. It can be increased by increasing the number of quantization level. In this way the fractional increase in the transmission bandwidth would be (assume )

Question 6

Match List-I (semiconductor device) with List-II (Application) and select the correct answer using the codes given below the lists:

Question 7

For a common-emitter amplifier, which of the following is true, if is the overall voltage gain, is the resistance of signal source, is the small-signal input resistance between base and emitter, considering the base and gm is the transconductance?

Question 8


, , ,
what is the value of Rin?

Question 9

In free space then average power crossing a circular Area of radius 2.5m in the plane 1=constant is: -

Question 10

Fifteen coupons are numbered, 1, 2, 3, .....15. Seven coupons are selected at random one at a time with replacement. Find the probability the largest number appearing on the coupon is 9's..

Question 11

Current I through resistance r in the circuit shown below is,

Question 12

Calculate the value R1. How will R1 change if Ra,Rb and Rc are doubled?

Question 13

Predict the open loop transfer function G(s)H(s) of this pole-zero diagram given below,
                  

Question 14

The transfer function, H(s) = and input of the system, X(s) =. Determine the stability of the system.

Question 15

The open loop Transfer Function of a system is G(s)H(s) = . the angle of departure at (-1 – j ) is

Question 16

Which of the following signals represents unit ramp signal?

Question 17

The FET in the circuit has rds = 50KΩ and gm = 5 mS. Determine the value of voltage gain. .

Question 18

Find the per unit change in current of a Ge diode if VT=26mV and the forward voltage drop increases by 50mV.

Question 19

A lossy material has .The phase constant is 10 rad/m at 5Mhz
The loss tangent is

Question 20

The open loop transfer function of a system is given as It is converted into a closed loop system by providing a negative feedback having feedback transfer function (s + 2), then the open loop and closed loop system are said to be respectively
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Mar 13ESE & GATE EC