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BARC Full Syllabus Test 25

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Question 1

If a vector

is given by,

Then the value of is

Question 2

A message signal shown in below figure is applied to the AM modulator with modulation index 62%. If m(t) is a periodic signal then the modulation efficiency is

Question 3

Which of the following introduces mode partition noise?

Question 4

At room temperature, a silicon photodetector can’t be used to detect which of the following wavelength

Question 5

A coil of inductance 2 H and resistance

is connected to a 10 V battery with negligible internal resistance. The amount of energy stored in the magnetic field is

Question 6

Consider the following RC circuit. The capacitor has an initial charge q₀ such that it opposes the flow of charging current:

The response of the circuit i(t) will be

Question 7

A bandwidth of 10 kHz is required for AM system. If the lowest frequency component in the modulated signal is 555 kHz, carrier frequency in kHz is

Question 8

Express switching function f(ABC)= B'+C' in terms of min term.

Question 9

A unity Feedback control system has an open-loop transfer function

.
The gain K for which s = -1 + j1 will lie on the root locus of this system is:

Question 10

In the circuit, the silicon diode D₁, having a voltage drop of 0.7 V is forward bias. A Zener diode D₂ has a breakdown voltage of 6.8 V. From the options given below, select the right option that shows current flowing through 450 Ω resistor.

Question 11

What would be the bandwidth of the output signal of SSB-AM (USB) modulator illustrated below when the bandwidth of the baseband message signal is 3 kHz and c(t) = 2sin(200 * 10³ πt).