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Electronics and Communication Engineering

GATE ECE topic:electronics PYQs

Build your understanding with focused practice from past exam papers.

Questions 311–320 of 715. Imported answers require independent review unless marked reviewed.

Topic practice 715 questionsPage 32 of 72

Question 51

Open question
ECMSQ2 marksNeeds review
Consider an FM broadcast that employs the pre-emphasis filter with frequency response

where

rad/sec. For the network shown in the figure to act as a corresponding de-emphasis filter, the appropriate pair(s) of

values is/are ______.
Diagram for Electronics and Communication Engineering question 51

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Question 52

Open question
ECMSQ2 marksNeeds review
A waveguide consists of two infinite parallel plates (perfect conductors) at a separation of

cm, with air as the dielectric. Assume the speed of light in air to be

m/s. The frequency/frequencies of TM wave which can propagate in this waveguide is/are
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Question 53

Open question
ECNAT2 marksNeeds review
The value of the integral

where

is the shaded triangular region shown in the diagram, is _____ (rounded off to the nearest integer).
Diagram for Electronics and Communication Engineering question 53


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Question 54

Open question
ECNAT2 marksNeeds review
A linear 2-port network is shown in Fig. (a). An ideal DC voltage source of 10 V is connected across Port 1. A variable resistance

is connected across Port 2. As

is varied, the measured voltage and current at Port 2 is shown in Fig. (b) as a

versus

plot. Note that for

V,

mA, and for

V,

mA.
When the variable resistance

at Port 2 is replaced by the load shown in Fig. (c), the current

is ______ mA (rounded off to one decimal place).
Diagram for Electronics and Communication Engineering question 54


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Question 55

Open question
ECNAT2 marksNeeds review
For a vector

, the 8-point discrete Fourier transform (DFT) is denoted by

, where

Here,

. If

and

, then the value of

is ________ (rounded off to one decimal place).

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Question 56

Open question
ECNAT2 marksNeeds review
A

-type semiconductor with zero electric field is under illumination (low level injection) in steady state condition. Excess minority carrier density is zero at

, where

cm is the diffusion length for electrons. Assume electronic charge,

C. The profiles of photo-generation rate of carriers and the recombination rate of excess minority carriers (

) are shown. Under these conditions, the magnitude of the current density due to the photo-generated electrons at

is ________ mA/cm

(rounded off to two decimal places).
Diagram for Electronics and Communication Engineering question 56


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Question 57

Open question
ECNAT2 marksNeeds review
A circuit and the characteristics of the diode (D) in it are shown. The ratio of the minimum to the maximum small signal voltage gain

is ________ (rounded off to two decimal places).
Diagram for Electronics and Communication Engineering question 57


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Question 58

Open question
ECNAT2 marksNeeds review
Consider the circuit shown with an ideal OPAMP. The output voltage

is ________ V (rounded off to two decimal places).
Diagram for Electronics and Communication Engineering question 58


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Question 59

Open question
ECNAT2 marksNeeds review
Consider the circuit shown with an ideal long channel

MOSFET (enhancement-mode, substrate is connected to the source). The transistor is appropriately biased in the saturation region with

and

such that it acts as a linear amplifier.

is the small-signal ac input voltage.

and

represent the small-signal voltages at the nodes A and B, respectively. The value of

is ________ (rounded off to one decimal place).
Diagram for Electronics and Communication Engineering question 59


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Question 60

Open question
ECNAT2 marksNeeds review
The block diagram of a closed-loop control system is shown in the figure.

,

, and

are the Laplace transforms of the time-domain signals

,

, and

, respectively. Let the error signal be defined as

. Assuming the reference input

for all

, the steady-state error

, due to a unit step disturbance

, is ________ (rounded off to two decimal places).
Diagram for Electronics and Communication Engineering question 60


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