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
For a good conductor, the relation between α and β is
A)
α < β
B)
α = β
C)
α > β
D)
α = (β/2)
Option B: α = β. This matches the standard definition or established fact for the concept asked.
MES Jr. Grade • Paper-II
The changing electric field is equivalent to magnetic field is given by
A)
Maxwell’s correction
B)
Faraday’s law
C)
Both (a) and (b)
D)
None of these
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'None of these' (Option D).
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
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 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
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
Virtual ground in an OP-AMP is due to
A)
High gain
B)
High input impedance
C)
Both high gain and high input impedance
D)
Terminal is directly connected to ground.
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'High input impedance' (Option B).
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
The size of PROM needed to implement a dual 8-to-1 multiplexer with common selection inputs would be
A)
256 K x 2
B)
512 K x 2
C)
1024 K x 2
D)
None of these
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '256 K x 2' (Option A).
MES Jr. Grade • Paper-II
The 10-input bits to a 10-line decimal to four-line BCD priority encoder corresponding to 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9, respectively, are 1, 0, 0, 0, 1, 1, 0, 1, 0 and 0. What will be the corresponding BCD output if all inputs and outputs are active HIGH? The encoder has priority for higher order bits.
A)
0111
B)
1000
C)
1001
D)
0110
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '1001' (Option C).
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
A biasing circuit has a stability factor of 40. If due to temperature change, IC0 changes by 1µA, then IC will change by
A)
20 µA
B)
40 µA
C)
80 µA
D)
None of these
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '20 µA' (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
Two binary digits are applied to the inputs of a two-input AND gate. The output of the logic can generate
A)
BORROW OUT of a half subtractor
B)
CARRY OUT of a half-adder
C)
SUM output of a half-adder
D)
DIFFERENCE output of a half-adder
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'CARRY OUT of a half-adder' (Option B).
MES Jr. Grade • Paper-II
The unused inputs of CMOS logic family should never be left open. They should
A)
Preferably be grounded
B)
Preferably be tied to +VDD
C)
Be tied to logic LOW or logic HIGH level or another used input.
D)
Preferably be connected to one of the used inputs
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'Preferably be tied to +VDD' (Option B).
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
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
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
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
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
Which of the following material is not used as a piezoelectric transducer?
A)
Rochelle
B)
Lithium sulphate
C)
Barium titanate
D)
Tungsten oxide
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Barium titanate' (Option C).
MES Jr. Grade • Paper-I
A source of angular frequency 1rad/sec has a source impedance consisting of 1 ohm resistance in series with 1H inductance. The load that will obtain the maximum power transfer is
A)
1 ohm resistance
B)
1 ohm resistance in parallel with 1H inductance
C)
1 ohm resistance in series with 1F capacitance
D)
1 ohm resistance in parallel with 1F capacitance
Maximum power transfer in AC circuits requires the load impedance to be the complex conjugate of the source impedance. Here Zs=1+j1, so ZL=1−j1, which is 1 Ω in series with a 1 F capacitor at ω=1 rad/s.
MES Jr. Grade • Paper-I
With an increase in temperature, the Fermi level in an intrinsic semiconductor
A)
Moves closer to the conduction band edge
B)
Moves closer to the valance band edge
C)
Moves to the conduction band
D)
Remain at the centre of the forbidden gap.
Option B: Moves closer to the valance band edge. The result follows from the standard engineering relationship for the stated conditions.
