MES Jr. Grade • Paper-I
How much is the base-to-emitter voltage of a transistor in the “on” state?
A)
0 V
B)
0.7 V
C)
0.7 mV
D)
Undefined
Based on established principles in the relevant subject area, the correct and most appropriate choice is '0.7 mV' (Option C).
MES Jr. Grade • Paper-I
The boundary between p-type material and n-type material is called -
A)
a diode
B)
a reverse-biased diode
C)
a p-n junction
D)
a forward-biased diode
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'a diode' (Option A).
MES Jr. Grade • Paper-I
A system which is linear is said to obey the rules of -
A)
scaling
B)
additivity
C)
both scaling and additivity
D)
homogeneity
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'homogeneity' (Option D).
MES Jr. Grade • Paper-I
A system is said to be defined as non-causal, when -
A)
the output at the present depends on the input at an earlier time
B)
the output at the present does not depend on the factor of time at all
C)
the output at the present depends on the input at the current time
D)
the output at the present depends on the input at a time instant in the future
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'the output at the present depends on the input at an earlier time' (Option A).
MES Jr. Grade • Paper-I
At a very low temperature, a semiconductor -
A)
becomes a conductor
B)
becomes an insulator
C)
may become a conductor or an insulator
D)
will remain a semiconductor
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'becomes a conductor' (Option A).
MES Jr. Grade • Paper-I
The colour code on a carbon resistor is red-red-black-silver. The value of resistor is -
A)
22000 W
B)
2200 W
C)
22 ± 5% W
D)
22 ± 10% W
Based on established principles in the relevant subject area, the correct and most appropriate choice is '22000 W' (Option A).
MES Jr. Grade • Paper-I
Under normal conditions a diode conducts current when it is -
A)
reverse-biased
B)
forward-biased
C)
Avalanched
D)
Saturated
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'forward-biased' (Option B).
MES Jr. Grade • Paper-I
In paramagnetic materials -
A)
permanent magnetic dipoles exist but the interaction between neighbouring dipoles is negligible
B)
permanent magnetic dipole do not exist
C)
permanent magnetic dipoles exist and the interaction between neighbouring dipoles is very strong
D)
permanent magnetic dipole moment may or may not exist
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'permanent magnetic dipole moment may or may not exist' (Option D).
MES Jr. Grade • Paper-I
Reciprocity Theorem is used to find the change in _________ when the resistance is changed in the circuit.
A)
Voltage
B)
Voltage or current
C)
Current
D)
Power
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Current' (Option C).
MES Jr. Grade • Paper-I
For a voltage source to be neglected, the terminals across the source should be -
A)
replaced by inductor
B)
short circuited
C)
replaced by some resistance
D)
open circuited
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'short circuited' (Option B).
MES Jr. Grade • Paper-I
If source impedance is complex, then maximum power transfer occurs when the load impedance is _________ the source impedance.
A)
equal to
B)
negative of
C)
complex conjugate of
D)
negative of complex conjugate of
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'negative of' (Option B).
MES Jr. Grade • Paper-I
The device possessing the highest photosensitivity is a
A)
Photoconductive cell
B)
Photovoltaic cell
C)
Photodiode
D)
Phototransistor
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Phototransistor' (Option D).
MES Jr. Grade • Paper-I
For a linear system y = f(x) find the valid points
A)
f[x(t+T)]=f[x(t)]+f[x(T)]
B)
f(kx)=kf(x)
C)
f(x1 + x2) = f(x1) + f(x2)
D)
All are correct
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'f(x1 + x2) = f(x1) + f(x2)' (Option C).
MES Jr. Grade • Paper-I
The inverse Laplace transform of 1/(s-a)^3 is
A)
e^at
B)
t^2/2
C)
t^2 e^-at
D)
None of these
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 't^2/2' (Option B).
MES Jr. Grade • Paper-I
The Laplace transform of e^at is
A)
1/(s-a)
B)
1/(s+a)
C)
e^at/s^2
D)
None of these
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '1/(s-a)' (Option A).
MES Jr. Grade • Paper-I
At 25 °C, the collector-emitter voltage drop of a silicon transistor at saturation is approximately
A)
0.2 V
B)
0.3 V
C)
0.5 V
D)
0.7 V
Based on established principles in the relevant subject area, the correct and most appropriate choice is '0.7 V' (Option D).
MES Jr. Grade • Paper-I
In normal operation of an SCR, gate is ___________ with respect to cathode
A)
Positive
B)
Negative
C)
At zero potential
D)
None of these
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'At zero potential' (Option C).
MES Jr. Grade • Paper-I
FET has offset voltage of about
A)
0.2 V
B)
1.1 V
C)
0.6 V
D)
0 V
Based on established principles in the relevant subject area, the correct and most appropriate choice is '0 V' (Option D).
MES Jr. Grade • Paper-I
Hall effect device can be used to
A)
Multiply two signals
B)
Divide one signal by another on an instantaneous basis
C)
Add two signals
D)
Subtract one signal from another
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Divide one signal by another on an instantaneous basis' (Option B).
MES Jr. Grade • Paper-I
Z-transform X(z) of the sequence x(n) is given by
A)
X(z) = sum_{n=0 to inf} x(n) (1/z)^n
B)
X(z) = sum_{n=0 to inf} x(n) (z)^n
C)
X(z) = sum_{n=-inf to inf} x(n) (1/z)^n
D)
X(z) = sum_{n=-inf to inf} x(n) (z)^n
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'X(z) = sum_{n=0 to inf} x(n) (z)^n' (Option B).
MES Jr. Grade • Paper-I
If alpha = 0.995, IC = 10 mA and ICEO = 0.5 mA, then ICE will be
A)
100 mA
B)
200 mA
C)
300 mA
D)
400 mA
Based on established principles in the relevant subject area, the correct and most appropriate choice is '100 mA' (Option A).
MES Jr. Grade • Paper-I
A CE-amplifier has an upper 3 db frequency of 20 kHz. If two such stages are cascaded together, the new upper 3 db frequency would be
A)
13 kHz
B)
31.25 kHz
C)
8.28 kHz
D)
9.9 kHz
Based on established principles in the relevant subject area, the correct and most appropriate choice is '31.25 kHz' (Option B).
MES Jr. Grade • Paper-I
Memory in a discrete time system is analog of
A)
Energy storage in a continuous time system
B)
Memory in a continuous time system
C)
Sampled memory of a continuous time LTI system
D)
All of these
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'All of these' (Option D).
MES Jr. Grade • Paper-I
Z-transform of [ax(n) + by(n)] is
A)
ax(n) – by(n)
B)
ax(n) – y(n)
C)
ax(n) + by(n)
D)
x(n) – by(n)
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'ax(n) – y(n)' (Option B).
MES Jr. Grade • Paper-I
The initial value of F(s) = 1/(s(s^2 + 3s + 2)) is given by
A)
0.5
B)
1
C)
0.8
D)
0.2
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '0.2' (Option D).
