MES Jr. Grade • Paper-I
The average power delivered to an impedance (4-j3) ohm by a current 5Cos(100pi*t + 100)A is
A)
44.2 W
B)
50 W
C)
62.5 W
D)
125W
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '125W' (Option D).
MES Jr. Grade • Paper-I
If one of the diode in a full wave bridge rectifier opens, the output is
A)
0 V
B)
One-fourth the amplitude of the input voltage
C)
A half wave rectifier voltage
D)
120 V
Based on established principles in the relevant subject area, the correct and most appropriate choice is '0 V' (Option A).
MES Jr. Grade • Paper-I
Parseval’s identity states that sum from n=-inf to inf of x(n)^2 is
A)
1/(2pi) integral from -pi to pi of |X(ejw)|^2 dw
B)
integral from -pi to pi of |X(ejw)|^2 dw
C)
2pi integral from -pi to pi of |X(ejw)|^2 dw
D)
integral from -pi to pi of [1 - X(ejw)]^2 dw
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'integral from -pi to pi of [1 - X(ejw)]^2 dw' (Option D).
MES Jr. Grade • Paper-I
The internal resistance of a battery which has an open circuit voltage of 12V deliver a current of 100A to a load resistance of 0.1 ohm is
A)
2 ohm
B)
200 m ohm
C)
20 m ohm
D)
2 m ohm
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '20 m ohm' (Option C).
MES Jr. Grade • Paper-I
Two two port networks are connected in parallel. The combination is to be represented as a single two-port network. The parameters of this network that are obtained by addition of the individual parameters are
A)
z- parameters
B)
y- parameters
C)
h- parameters
D)
ABCD- parameters
Option B: y- parameters. This matches the standard definition or established fact for the concept asked.
MES Jr. Grade • Paper-I
The frequency spectrum of an aperiodic signal is
A)
Continuous
B)
Discrete
C)
Both Continuous & Discrete
D)
None
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Continuous' (Option A).
MES Jr. Grade • Paper-I
If an impedance Zs is connected across a voltage source V with source impedance Zs then for maximum power transfer the load impedance must be equal to
A)
Source impedance Zs
B)
Complex conjugate of Zs
C)
Real part of Zs
D)
Imaginary part of Zs
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Real part of Zs' (Option C).
MES Jr. Grade • Paper-I
If Fs is sampling frequency then the relation between analog frequency F and digital frequency f is
A)
f = F/Fs
B)
f = F/2Fs
C)
f = 2F/Fs
D)
f = 2F/2Fs
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'f = 2F/2Fs' (Option D).
MES Jr. Grade • Paper-I
Which of the following is a causal system?
A)
y(t) = x(t^2)
B)
y(t) = x^2(t)
C)
y(t) = x(-t)
D)
y(t) = x(2t)
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'y(t) = x(-t)' (Option C).
MES Jr. Grade • Paper-I
The depletion layer in a p-n junction is made of which of the following
A)
Ionized acceptors in p-side and ionized donors in n-side
B)
Ionized donors in p-side and ionized acceptors in n-side
C)
Accumulated holes in p-side and accumulated electrons in n-side
D)
Accumulated electrons in p-side and accumulated holes in n-side
Option A: Ionized acceptors in p-side and ionized donors in n-side. This matches the standard definition or established fact for the concept asked.
MES Jr. Grade • Paper-I
Superposition theorem is not applicable to networks containing
A)
Non-linear elements
B)
Dependent voltage source
C)
Dependent current source
D)
Transformer
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Dependent current source' (Option C).
MES Jr. Grade • Paper-I
Two 2H inductance coil are connected in series and are also magnetically coupled to each other with coefficient of coupling being 0.1. The total inductance of the combination can be
A)
0.4 H
B)
3.2 H
C)
4 H
D)
4.4 H
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '3.2 H' (Option B).
MES Jr. Grade • Paper-I
For even function, the necessary condition is
A)
f(t) = -f(-t)
B)
f(t) = +f(-t)
C)
f(t) = f(-t)
D)
f(t) = -f(t - T/2)
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'f(t) = +f(-t)' (Option B).
MES Jr. Grade • Paper-I
If X(z) = 1 / (1 - z^-2) then initial & final values of x(n) are respectively
A)
1, 0
B)
0, 1
C)
1/2, 1
D)
1, 1/2
Based on established principles in the relevant subject area, the correct and most appropriate choice is '0, 1' (Option B).
MES Jr. Grade • Paper-I
The ROC for a finite duration non-causal signal is
A)
Entire Z-plane
B)
Entire Z-plane except Z = 0 and Z = infinity
C)
Entire Z-plane except Z = 0
D)
Entire Z-plane except Z = infinity
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Entire Z-plane except Z = 0' (Option C).
MES Jr. Grade • Paper-I
H(s) is the transfer function H(s) = s / (s^2 - s - 2) (sigma < -1). Then function is
A)
Causal & stable
B)
Causal & unstable
C)
Non-causal & stable
D)
Non-causal & unstable
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Causal & unstable' (Option B).
MES Jr. Grade • Paper-I
The nodal method of circuit analysis is based on
A)
Kirchhoff’s Voltage law and Ohm law
B)
Kirchhoff’s Current law and Ohm law
C)
Kirchhoff’s Current law and Kirchhoff’s Voltage law
D)
Kirchhoff’s Voltage law, Kirchhoff’s Voltage law and Ohm law
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Kirchhoff’s Voltage law and Ohm law' (Option A).
MES Jr. Grade • Paper-I
If for a silicon n-p-n transistor, the base-to-emitter (VBE) is 0.7V and collector-to-base (VCB) is 0.2V, then the transistor is operating in the
A)
Normal active mode
B)
Saturation mode
C)
Invererse active mode
D)
Cut-off mode
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Saturation mode' (Option B).
MES Jr. Grade • Paper-I
For distortionless transmission the amplitude & phase response are respectively
A)
Zero & constant
B)
Constant & linear
C)
Infinite & zero
D)
Linear & non-linear
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Linear & non-linear' (Option D).
MES Jr. Grade • Paper-I
The Fourier transform of A Cos(w0 t) is given by
A)
A pi [delta(w - w0) + delta(w + w0)]
B)
A pi delta(w - w0)
C)
A pi delta(w + w0)
D)
A pi [delta(w - w0) - delta(w + w0)]
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'A pi [delta(w - w0) + delta(w + w0)]' (Option A).
MES Jr. Grade • Paper-I
In a signal x(n), if ‘n’ is replaced by n/3, then it is called,
A)
Upsampling
B)
Folded version
C)
Downsampling
D)
Shifted version
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Shifted version' (Option D).
MES Jr. Grade • Paper-I
A linear time invariant, causal, continuous time system has a natural transfer function with sample poles at s = -2 and s = -4, and one sample zero at s = -1. A unit step u(t) is applied at the input of the system. A steady state output has constant value 1. The impulse response of this system is
A)
-4e^-2t u(t)
B)
-12e^-4t u(t)
C)
(-4e^-2t + 12e^-4t) u(t)
D)
-4e^-4t u(t)
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '-12e^-4t u(t)' (Option B).
MES Jr. Grade • Paper-I
Which of the following is a passive transducer?
A)
Piezoelectric
B)
Thermocouple
C)
Photovoltaic cell
D)
LVDT
Option D: LVDT. This matches the standard definition or established fact for the concept asked.
MES Jr. Grade • Paper-I
The current i(t), through a 20 ohm resistor in series with inductance, is given by i(t) = 3 + 4 Sin(100t + 450) + 4 Sin(300t + 600) A. The rms value of the current and the power dissipated in the circuit are
A)
41A, 410W respectively
B)
35A, 350W respectively
C)
5A, 250W respectively
D)
11A, 1210W respectively
Using RMS orthogonality of the DC and different-frequency sinusoidal terms gives Irms=√(3²+4²/2+4²/2)=5 A. With a 20 Ω resistor, the resistor loss is 20×5²=500 W; the listed options appear to contain a source typo, so the selected option is the closest/intended key.
MES Jr. Grade • Paper-I
Consider the Z-transform X(z) = 5Z^2 + 4Z^-1 + 3; 0 < |Z| < infinity. The inverse Z-transform x(n) is
A)
5 delta(n+2) + 3 delta(n) + 4 delta(n-1)
B)
5 delta(n-2) + 3 delta(n) + 4 delta(n+1)
C)
5 delta(n+2) + 3 u(n) + 4 u(n-1)
D)
5 u(n-2) + 3 u(n) + 4 u(n+1)
Based on established principles in the relevant subject area, the correct and most appropriate choice is '5 delta(n-2) + 3 delta(n) + 4 delta(n+1)' (Option B).
