ISRO 2018 EC Mini Mock 1 (Full Syllabus) for ESE & GATE EC Exams

Question 1

3 ideal transformers having turns ratio 20:30, 30: 40, 20: 10 are connected in cascade. The transmission parameter matrix of the overall system is

Question 2

If the gain of a 3-stage amplifier is 5dB in each stage. What will be the overall gain of the amplifier (in dB)?

Question 3

The integral form of a Maxwell equation as given below, that depicts a time-varying magnetic field produces an electric field is popularly known as:

Question 4

For the given circuit diode cut-in voltage is V_in= 0.The ripple voltage is to be no more than V_rip= 4 V. The minimum load resistance, that can be connected to the output is

Question 5

Which of the following is applicable to a Forward Wave Travelling Wave Tube Amplifier that contributes to the principle of operation?

Question 6

dz evaluated anticlockwise around the circle

where i =

is

Question 7

The Fourier transform of a signal

is given by

Question 8

The given below Ring Oscillator has propagation delay of each inverter 120ps. What will be the fundamental frequency of oscillator output?
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Question 9

A 16-bit register is constructed using D-Flip Flop. Match the following for the total pulse for input & output:

Question 10

The transistor is based with a current source I= 0.5mA and β= 100 replace the transistor with simplified π model and find the voltage gain.

Question 11

An analog signal (low pass) of 4 kHz BW is sampled at the Nyquist rate, subsequently quantized and encoded into a binary PCM wave with 128 quantization levels. The work synchronization is effected by adding a synchronizing pulse at the end of each code word. The bit rate to the resulting PCM signal will be______(Khz)

Question 12

Consider the system shown below

The closed-loop system sensitivity with respect to the feedback path transfer function at ω= 0.5 red/sec is_______.

Question 13

In direction of propagation, which mode is resulted to excite a waveguide such that an extra electric component appeared.

Question 14

Two dipoles with moments -5a_z nC/m and 9a_z nC/m are located at points (0,0,-2) and (0,0,3) respectively. The potential at the origin is ____________.

Question 15

The Fourier transform of

is

Question 16

The bilateral Laplace transform of u (- t + 5) is

Question 17

Calculate R_N for the given circuit using Norton’s theorem if R_N is purely resistive and ω=1rad/s

Question 18

Calculate the cut-off frequency (in kHz) of a π-section filter network whose series arm inductance is 10 mH and two shunt arm capacitances are 0.16 μF each.

Question 19

In which of the following fields, microwave does not have applications?

Question 20

From the following signals, find the signal whose Fourier series does not exist or it is invalid.