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ESE EC 2021 Technical Quiz 21

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Question 1

On a particular day, the maximum frequency reflected from the ionosphere is 10 MHz. On another day, it was found to increase to 11 MHz. Calculate the ratio of the maximum electron densities of the ionosphere on the two days.

Question 2

Find the emitter to collector voltage V_EC for the pnp transistor circuit shown in Fig., given β is very large, V_EB(ON) = 0.7 V

Question 3

A ground receiver station is receiving a signal at 100 MHz, transmitted from a ground transmitter at a height of 300 m located at a distance of 100 km. (Given the value of radius of the earth is 6400 km and maximum electron density, N_max =10¹² m^-3). Identify it is coming via_______________.

Question 4

A conductor has cross sectional areas of 1 cm² and free electron concentration of 10¹⁹cm^–3. If a current of 0.24 A is flowing through this conductor, then the drift velocity of electrons in that conductor is

Question 5

An Analog signal is quantized and transmitted using a PCM system. The tolerable error in sample amplitude is 0.5% of the peak-to-peak full scale value. The minimum binary digits required to encode a sample is

Question 6

For a PM modulator with a deviation sensitivity K = 2.5 rad/V and a modulating signal v_m(t) = 2cos(2π2000t), the peak phase deviation m will be

Question 7

Feedback control system is shown in figure below

The gain cross over frequency of the system in rad/sec

Question 8

Consider the signal given below,

then the z-transform X(z) is

Question 9

Consider the class AB stage amplifier shown in figure with V_T (thermal voltage) = 25mV. If both transistors have reverse saturation current
I_s = 10^–15 A, the value of quiescent current I_c is ______ μA (Assume beta to be very high)

Question 10

The MUX shown below is a 4 × 1 multiplexer. The output Z is :

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ESE & GATE EC General

Apr 10ESE & GATE EC