MES Jr. Grade • Paper-III
Out of the following diodes, the noisiest one is
A)
TRAPATT
B)
IMPATT
C)
GUNN
D)
Tunnel
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'TRAPATT' (Option A).
MES Jr. Grade • Paper-III
Maximum electronic efficiency of two cavity Klystron is
A)
58%
B)
85%
C)
35%
D)
100%
Based on established principles in the relevant subject area, the correct and most appropriate choice is '100%' (Option D).
MES Jr. Grade • Paper-III
In a super heterodyne receiver, which stage produces IF signal?
A)
Grand condenser
B)
RF amplifier
C)
Mixer
D)
None of these
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'None of these' (Option D).
MES Jr. Grade • Paper-II
The transformation between differential and integral form requires
A)
Stokes theorem
B)
Gauss theorem
C)
Both (a) and (b)
D)
None of these
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Both (a) and (b)' (Option C).
MES Jr. Grade • Paper-II
The impulse response of a certain system is Sin(2t). The system transfer function is
A)
1/(s²+2)
B)
2/(s²+2)
C)
2/(s²+4)
D)
1/(s²+4)
L{sin(2t)}=2/(s²+4), so the transfer function is 2/(s²+4).
MES Jr. Grade • Paper-II
For a feedback control system, G(s) = 1/s² and H(s) = (s+3). The steady-state output for a unit step input will be
A)
1
B)
0.5
C)
0
D)
0.33
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '0' (Option C).
MES Jr. Grade • Paper-II
The complement of [(AB+C)D+E]F is
A)
[(A+B).C+D].E+F
B)
[(A+B).C+D]+F
C)
[A+B+D].E+F
D)
[(A+B).C+D].E+F
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '[(A+B).C+D]+F' (Option B).
MES Jr. Grade • Paper-II
A four-bit ripple counter and a four-bit synchronous counter are made using flip-flops having a propagation delay of 10 ns each. If the worst case delay in the ripple counter and the synchronous counter be R and S respectively, then
A)
R = 10 ns and S = 40 ns
B)
R = 40 ns and S = 10 ns
C)
R = 10 ns and S = 30 ns
D)
R = 30 ns and S = 40 ns
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'R = 10 ns and S = 40 ns' (Option A).
MES Jr. Grade • Paper-II
An op-amp having a slew-rate specification of 1 V/µs has been connected in the voltage follower configuration. The input is a unit step of voltage applied at instant t = 0. What is the output magnitude at t = 500 ns?
A)
1 V
B)
0 V
C)
0.5 V
D)
2.5 V
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '1 V' (Option A).
MES Jr. Grade • Paper-II
The intrinsic impedance of free space is
A)
127Ω
B)
177Ω
C)
120πΩ
D)
177πω
Option C: 120πΩ. The result follows from the standard engineering relationship for the stated conditions.
MES Jr. Grade • Paper-II
The minimum number of comparators required to build an eight-bit-flash ADC is
A)
8
B)
63
C)
255
D)
290
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '63' (Option B).
MES Jr. Grade • Paper-II
The propagation constant pure imaginary means
A)
Wave without attenuation
B)
No wave motion
C)
Wave with attenuation
D)
Wave with increasing attenuation
Option A: Wave without attenuation. This matches the standard definition or established fact for the concept asked.
MES Jr. Grade • Paper-II
A lead compensator may be represented by one of the following transfer functions.
A)
(s+2)/(s+4)
B)
(s+4)/(s+2)
C)
s(s+2)/(s+4)
D)
s(s+3)/(s+2)
Option A: (s+2)/(s+4). This matches the standard definition or established fact for the concept asked.
MES Jr. Grade • Paper-II
A certain control system is represented by the following differential equation: d²y/dt² + dy/dt + 3y = dx/dt + 2x. Its transfer function would be
A)
(s+2)/(s+3)
B)
(s+2)/(s²+s+3)
C)
(s²+2)/(s²+s+3)
D)
None of these
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '(s+2)/(s²+s+3)' (Option B).
MES Jr. Grade • Paper-II
In class A amplifier VCEmax = 15 V and VCEmin = 1V. The conversion efficiency for a series fed load will be equal to
A)
25%
B)
23.33%
C)
12.5%
D)
11.67%
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '25%' (Option A).
MES Jr. Grade • Paper-II
The conduction current density J is
A)
∂D/∂t
B)
∂B/∂t
C)
∂E/∂t
D)
σE
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'σE' (Option D).
MES Jr. Grade • Paper-II
The open-loop transfer function of a unity feedback system is G(s) = K / [s(s²+s+2)(s+3)]. The range of K for which the system is stable is
A)
24 > K > 0
B)
13/4 > K > 0
C)
21/4 < K < ∞
D)
-6/4 < K < ∞
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '-6/4 < K < ∞' (Option D).
MES Jr. Grade • Paper-II
At the interface of perfect conductor and perfect dielectric, there can exits
A)
Surface current
B)
Surface charge
C)
Surface voltage
D)
None of these
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Surface charge' (Option B).
MES Jr. Grade • Paper-II
Given an op-amp with output saturation voltages of ± 10 V and slew rate of 10 V/µs. What is the highest input frequency that would yield output waveform transition time of not more than 10% of half of the time period of input signal?
A)
1 KHz
B)
10 KHz
C)
25 KHz
D)
100KHz
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '10 KHz' (Option B).
MES Jr. Grade • Paper-II
Negative feedback in an amplifier leads to which one of the following
A)
Decrease in bandwidth
B)
Increase in voltage gain
C)
Increase in current gain
D)
Decrease in voltage gain
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Increase in voltage gain' (Option B).
MES Jr. Grade • Paper-II
Among the following types of A/D converters, name the one which the analog signal is sampled at a frequency much higher than the Nyquist rate
A)
Tracking type A/D converter
B)
Dual-slope integrating-type A/D converter
C)
Half-flash A/D converter
D)
Sigma-Delta A/D converter
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Dual-slope integrating-type A/D converter' (Option B).
MES Jr. Grade • Paper-II
Identify the TEM wave
A)
Plane wave
B)
Cylindrical wave
C)
Spherical wave
D)
All of these
Option A: Plane wave. This matches the standard definition or established fact for the concept asked.
MES Jr. Grade • Paper-II
The open-loop frequency response of a system at two particular frequencies are given by 1.2∠-180° and 1.0∠-190°. The closed-loop unity feedback control is then
A)
Stable
B)
Unstable
C)
Marginally stable
D)
None of these
Option B: Unstable. The result follows from the standard engineering relationship for the stated conditions.
MES Jr. Grade • Paper-II
The counter that has a modulus of 64 should use a minimum of
A)
Six flip-flops
B)
Six J-K flip-flops
C)
Six D- flip-flops
D)
64 T flip-flops
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Six flip-flops' (Option A).
MES Jr. Grade • Paper-II
The Nyquist plot of G(jω)H(jω) for a closed-loop control system, passed through (-1, j0) point in the GH plane. The gain margin of the system in dB is equal to
A)
Infinite
B)
Greater than zero
C)
Less than zero
D)
Zero
Option D: Zero. This matches the standard definition or established fact for the concept asked.
