# GATE QUESTION PAPER-ECE

No. Question
1

A 1 kHz sinusoidal signal is ideally sampled at 1500 samples/sec and the sampled signal is passed through an, ideal low-pass filter with cut-off frequency 800 Hz.
The output signal has the frequency
Options
A) zero Hz B) 0.75 kHz
C) 0.5 kHz D) 0.25 kHz
2 The minimum number of 2-to -1 multiplexers required to realize a 4-to 1 multiplexer is
Options
A) 1 B) 2
C) 3 D) 4
3 Choose the correct one front among the alternatives A, B, C, D after matching an item from Group 1 with the most appropriate item, in Group 2.

Group 1 Group 2
P: Shift register 1:Frequency division
Q: Counter 2: Addressingin memory chips
R: Decoder 3: Serial to parallel data conversion

Options
A) P-3, Q- 2, R-1 B) P-3, Q-1, R-2
C) P-2, Q-1, R-3 D) P-1, Q- 2, R-2
4 A random variable X with uniform density in the interval 0 to 1 is quantized as follows:
If 0 £ X £ 0.3, xq = 0
If 0.3 £ X £ 1, xq = 0.7
where xq is the quantized value of X.
The root-mean square value of the quantization noise is
Options
A) 0.573 B) 0.198
C) 2.205 D) 0.266
5 In a full-wave rectifier using two ideal diodes, Vdc and Vm are the dc and peak values of the voltage respectively across a resistive load. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier are
Options
A)

Vdc =
Vm
p
, PIV = 2Vm
B) Vdc = 2
Vm
p
, PIV = 2Vm
C) Vdc = 2
Vm
p
, PIV = Vm D) Vdc =
Vm
p
, PIV = Vm
6 The Fourier transform of a conjugate symmetric function is always
Options
A) imaginary B) conjugate anti-symmetric
C) real D) conjugate symmetric
7 It is desired to multiply the numbers 0AH by 0BH and store the result in the accumulator. The numbers are available in registers B and C respectively. A Part of
the 8085 program for this purpose is given below:
MVI A, 00H
Loop;- – - – - – - – -
——————–
——————-
HLT END
The sequence of instruction to the complete the program would be
Options
A) JNZ LOOP, ADD B, DCR C B) ADD S, JNZ LOOP, DCR C
C) DCR C, JNZ LOOP, ADD B D) ADD B, DCR C, JNZ LOOP
8

A solution of the following differential equation is given by

d2y
dx2
-
dy
dx
+ 6y = 0
Options
A)

y = e2x + e-3x
B)

y = e2x + e3x
C)

y = e-2x + e3x
D)

y = e-2x + e-3x
9 Consider the following statements S1 and S2.
S1: The threshold voltage (VT) of a MOS capacitor decreases with increase in gate oxide thickness
S2: The threshold voltage (VT) of a MOS capacitor decreases with increase in substrate doping concentration
Which one of the following is correct?
Options
A) S1 is FALSE and S2 is TRUE
B) Both S1 and S2 are TRUE
C) Both S1 and S2 are FALSE
D) S1 is TRUE and S2 is FALSE
10 Consider an abrupt p-junction. Let Vbi be the built-in potential of this junction and VR be the applied reverse bias. If the junction capacitance (Cj) is 1 pF for
Vbi + VR = 1V, then for Vbi + VR – 4V, Cj will be
Options
A) 4 pF B) 2 pF
C) 0.25 pF D) 0.5 pF
11 The impurity commonly used for realizing the base region of a silicon n-p-n transistor is
Options
A) Gallium B) Indium
C) Boron D) Phosphorus
12 Despite the presence of negative feedback, control system still have problems of instability because the
Options
A) components used have nonlinearities. B) dynamic equations of the subsystems are not known exactly.
C) mathematical analysis involves approximations. D) system has large negative phase angle at high frequencies.
13 The drain of an n-channel MOSFET is shorted to the gate so that VGS = VDS. The threshold voltage (VT) of MOSFET is 1 V. If the drain current (ID) is 1 mA for VGS = 2V, then for VGS = 3V, ID is
Options
A) 2 mA B) 3 mA
C) 9 mA D) 4 mA
14 Let x(n) = (
1
2
)n u(n), y(n)=x2(n) and Y(ejw) be the Fourier transform of y(n). Then Y(ej0) is
Options
A)
1
4
B) 2
C) 4 D)
4
3
15 Noise with uniform power spectral density of N0W/Hz is passed through a filter H (w) = 2 exp(-jwtd) followed by an ideal low pass filter of bandwidth BHz. The output noise power in Watts is
Options
A) 2N0B B) 4N0B
C) eN0B D) 16 N0B
16 Consider the following statements S1 and S2
S1: At the resonant frequency the impedance of a series R-L-C circuit is zero.
S2: In a parallel G-L-C circuit, increasing the conductance G results in increase in its Q factor.
Which one of the following is correct?

Options
A) S1 is FALSE and S2 is TRUE B) Both S1 and S2 are TRUE
C) S1 is TRUE and S2 is FALSE D) Both S1 and S2 are FALSE
17 A signal x(n) = sin(w0n + f ) is the input to a linear time-invariant system having a frequency response H(e(jw ). If the output of the system Ax(n – n0), then the most general form of ÐH(ejw) will be
Options
A) – n0w0 + b for any arbitrary real b. B) – n0w0 + 2pk for any arbitrary integer k.
C) n0w0 + 2pk for any arbitrary integer k. D) -n0w0 f .
18 Consider a lossless antenna with a directive gain of +6dB. If 1 mW of power is fed to it the total power radiated by the antenna will be
Options
A) 4 mW B) 1 mW
C)
7 mW D) 1/4 mW
19 A MOS capacitor made using p type substrate is in the accumulation mode. The dominant charge in the channel is due to the presence of
Options
A) holes B) electrons
C) positively charged ions D) negatively charged ions
20

Choose the correct one from among the alternatives A, B, C, D after matching an item from Group 1 with the most appropriate item in Group 2.

Group1 Group 2
1: FM
2: DM
3: PSK
4: PCM P: Slope overload
Q: m -law
R: Envelope detector
S: Capture effect
T: Hilbert transform
U: Matched filter
Options
A) 1-T, 2-P, 3-U, 4-S B) 1-S, 2-U, 3-P, 4-T
C) 1-S, 2-P, 3-U, 4-Q D) 1-U, 2-R, 3-S, 4-Q

## 47 thoughts on “GATE QUESTION PAPER-ECE”

1. Daniel

ur page is good it would be more good if u add more than one question papers i.e.minimum five
thank u

2. Ankita guleria

sir,

most respectfully i want old year papers and imp. study material for preparation of GATE

1. mallamma

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3. shubham

plz send megate 10 year question papers of EC branch plz plz plz plz plz………………………..

4. Shivani

Hiiiiiiiiiiiiii…….Pls send last ten years question with solution……..solutions will be on next page……!!!!

5. JOTHI.G

I need qustion and answer with solution for electronics and communication engineering in gate exam and also BHEL exam

6. Laxmi pawar

I am Laxmi 3rd year ECE student. please send me previous 10 year Gate Ques. papers for ECE with solutions as soon as u can on my email id.

7. shanky

plz send me some important question which r frequently asked……n sample paper with solution..plz

8. malyn danica

elow..dou have questions in pdf form??can i have copies for these questions??latest questions and answers for ece..thanx a lot..Godbless

9. yaman singhal

plz send me a email which conssiits alll papers for ece gate examination
om sai ram

10. NIROSHA.P

SIR,
Immediately I want GATE question paper from the year of 2005 to 2009 pls kindly send me sir as soon as possible

11. Md Saqib Nazir

sir i m in my 3rd year of engg plz help me by providing me a whole sample or module paper of your forum.which will help me to gain more knowledge.plz sir give me a bunch of sample paper my stream is ECE.ifu provide me as earlier it will be greatful for me.

12. josini

plz send me solved question of gate for ece branch…n could u tell me which book should i refer