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 |
|
Your Answer |
(Not
Answered) |
Correct Answer |
C |
|
2 |
The minimum number of 2-to -1 multiplexers
required to realize a 4-to 1 multiplexer is
|
Options |
|
Your Answer |
(Not
Answered) |
Correct Answer |
B |
|
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 |
|
Your Answer |
(Not
Answered) |
Correct Answer |
B |
|
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 |
|
Your Answer |
(Not
Answered) |
Correct Answer |
A |
|
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 =
, PIV = 2Vm |
B) Vdc = 2
, PIV = 2Vm |
C) Vdc = 2
, PIV = Vm |
D) Vdc =
, PIV = Vm |
|
Your Answer |
(Not
Answered) |
Correct Answer |
B |
|
6 |
The Fourier transform of a conjugate symmetric
function is always
|
Options |
A) imaginary |
B) conjugate anti-symmetric
|
C) real |
D) conjugate symmetric |
|
Your Answer |
(Not
Answered) |
Correct Answer |
C |
|
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 |
|
Your Answer |
(Not
Answered) |
Correct Answer |
D |
|
8 |
A solution of the following differential equation is given by
-
+ 6y = 0 |
Options |
A)
y = e2x + e-3x
|
B)
y = e2x + e3x
|
C)
y = e-2x + e3x
|
D)
y = e-2x + e-3x
|
|
Your Answer |
(Not
Answered) |
Correct Answer |
B |
|
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 |
|
Your Answer |
(Not
Answered) |
Correct Answer |
A |
|
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 |
|
Your Answer |
(Not
Answered) |
Correct Answer |
D |
|
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 |
|
Your Answer |
(Not
Answered) |
Correct Answer |
C |
|
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. |
|
Your Answer |
(Not
Answered) |
Correct Answer |
A |
|
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 |
|
Your Answer |
(Not
Answered) |
Correct Answer |
D |
|
14 |
Let x(n) = (
)n u(n), y(n)=x2(n) and Y(ejw)
be the Fourier transform of y(n). Then Y(ej0) is |
Options |
|
Your Answer |
(Not
Answered) |
Correct Answer |
A |
|
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 |
|
Your Answer |
(Not
Answered) |
Correct Answer |
B |
|
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 |
|
Your Answer |
(Not
Answered) |
Correct Answer |
D |
|
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 . |
|
Your Answer |
(Not
Answered) |
Correct Answer |
B |
|
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 |
|
Your Answer |
(Not
Answered) |
Correct Answer |
A |
|
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 |
|
Your Answer |
(Not
Answered) |
Correct Answer |
B |
|
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 |
|
Your Answer |
(Not
Answered) |
Correct Answer |
C |