MES Jr. Grade • Paper-III
The number of memory cycles required to execute the following 8085 instructions: I. LDA 3000H, II. LXI D, F0F1H would be
A)
2 for (I) and 2 for (II).
B)
4 for (I) and 3 for (II).
C)
3 for (I) and 3 for (II).
D)
3 for (I) and 4 for (II).
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '2 for (I) and 2 for (II).' (Option A).
MES Jr. Grade • Paper-III
A rectangular waveguide has dimensions 4cm × 2cm. Over what frequency range will such a guide support a single mode?
A)
3.5 to 5.5 GHz.
B)
3.5 to 7 GHz.
C)
3.5 to 7.5 GHz.
D)
It will support a single mode only at 3.5 GHz.
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '3.5 to 5.5 GHz.' (Option A).
MES Jr. Grade • Paper-III
A tracking radar antenna with operational wave-length of 3cm produces a pencil-like beam with both azimuth and elevation beam width equal to 0.5° each. The approximate gain of the antenna is
A)
48 dB
B)
52 dB
C)
60 dB
D)
40dB
Based on established principles in the relevant subject area, the correct and most appropriate choice is '60 dB' (Option C).
MES Jr. Grade • Paper-III
In a microwave test bench, why is the microwave signal amplitude modulated at 1 KHz?
A)
To increase the sensitivity of measurement.
B)
To transmit the signal to a far-off place.
C)
To study amplitude modulation.
D)
Because crystal detector fails at microwave frequencies.
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'To increase the sensitivity of measurement.' (Option A).
MES Jr. Grade • Paper-III
A mast antenna consisting of a 50m long vertical conductor operates over a perfectly conducting ground plane. It is base-fed at a frequency of 600 KHz. The radiation resistance of the antenna is
A)
2π²/5 Ω
B)
π²/5 Ω
C)
4π²/5 Ω
D)
20π²/5 Ω
Based on established principles in the relevant subject area, the correct and most appropriate choice is '4π²/5 Ω' (Option C).
MES Jr. Grade • Paper-III
The radiation pattern of an antenna in spherical co-ordinates is given by F(θ)=Cos^4(θ), 0≤θ≤π/2. The directivity of the antenna is
A)
10 dB
B)
12.6 dB
C)
11.5 dB
D)
18 dB
Based on established principles in the relevant subject area, the correct and most appropriate choice is '18 dB' (Option D).
MES Jr. Grade • Paper-III
An air-filled rectangular waveguide has inner dimensions of 3cm × 2cm. The wave impedance of the TE10 mode of propagation in the waveguide at a frequency of 30 GHz is (free space impedance Z0 = 377 Ω).
A)
308 W
B)
355 W
C)
400 W
D)
461 W
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is '355 W' (Option B).
MES Jr. Grade • Paper-III
A 3m diameter circular reflector antenna operates at 10 GHz. Its length efficiency is 0.7 and its radiation efficiency is 0.9. The beam width is
A)
0.410
B)
0.610
C)
0.800
D)
0.500
Based on established principles in the relevant subject area, the correct and most appropriate choice is '0.410' (Option A).
MES Jr. Grade • Paper-III
With reference to a 2K bit ROM organized as 256 x 8 array of memory cells, which one of the following statements is true?
A)
It uses 256 rows of eight cells each.
B)
It uses 2048 memory cells and 8-line to 256-line address decoder.
C)
It uses 8 rows of 256 cells each.
D)
It uses 2048 memory cells and 8-line to 256-line address encoder.
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'It uses 2048 memory cells and 8-line to 256-line address decoder.' (Option B).
MES Jr. Grade • Paper-III
With reference to 8085 microprocessor, ANA R/M is
A)
A logic instruction.
B)
An arithmetic instruction.
C)
A Data transfer instruction.
D)
A control instruction.
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'An arithmetic instruction.' (Option B).
MES Jr. Grade • Paper-III
The satellite communication channels in a transponder are defined by the
A)
Mixer
B)
LNA
C)
Band pass filter
D)
Input signals
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Mixer' (Option A).
MES Jr. Grade • Paper-III
An evanescent mode occurs when
A)
A wave is attenuated rather than propagated.
B)
The propagation constant is purely imaginary.
C)
A wave is propagated rather than attenuated.
D)
The wave frequency is same as the cut-off frequency.
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'A wave is propagated rather than attenuated.' (Option C).
MES Jr. Grade • Paper-II
Bridge rectifier is an alternative for
A)
Full wave rectifier
B)
Peak rectifier
C)
Half wave rectifier
D)
None of the mentioned
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Half wave rectifier' (Option C).
MES Jr. Grade • Paper-II
According to the coulomb’s law, the force between two point charges is
A)
Directly proportional to the product of the charges
B)
Inversely proportional to the square of the distance between them
C)
Along the line joining them
D)
All of these
Based on established principles in Law, the correct and most appropriate choice is 'All of these' (Option D).
MES Jr. Grade • Paper-II
Consider the following statements: Nichol’s chart gives information about i. Closed loop frequency response. ii. The value of the peak magnitude of the closed loop frequency response Mp. iii. The frequency at which Mp occurs. Which of the above statements are correct?
A)
ii and iii
B)
i and ii
C)
i and iii
D)
i, ii and iii
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'ii and iii' (Option A).
MES Jr. Grade • Paper-II
Relaxation oscillators are also known as ___________
A)
Multivibrator
B)
Phase shift oscillators
C)
Blocking oscillators
D)
Saw tooth generator
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Multivibrator' (Option A).
MES Jr. Grade • Paper-II
In which region a transistor acts as an open switch?
A)
cut off region
B)
inverted region
C)
active region
D)
saturated region
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'cut off region' (Option A).
MES Jr. Grade • Paper-II
The sinusoidal oscillator is also called ___________
A)
LC oscillator
B)
Harmonic oscillator
C)
RC oscillator
D)
Crystal oscillators
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'LC oscillator' (Option A).
MES Jr. Grade • Paper-II
Voltage shunt feedback amplifier forms
A)
A negative feedback
B)
A positive feedback
C)
Both positive and negative
D)
None of the mentioned
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Both positive and negative' (Option C).
MES Jr. Grade • Paper-II
For a half wave or full wave rectifier the Peak Inverse Voltage of the rectifier is always
A)
Greater than the input voltage
B)
Smaller than the input voltage
C)
Equal to the input voltage
D)
Greater than the input voltage for full wave rectifier and smaller for the half wave rectifier
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Equal to the input voltage' (Option C).
MES Jr. Grade • Paper-II
The magnetostatics highly relies on which property?
A)
Resistance
B)
Capacitance
C)
Inductance
D)
Moment
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'Moment' (Option D).
MES Jr. Grade • Paper-II
Which of the following helps in reducing the switching time of a transistor?
A)
a resistor connected from base to ground
B)
a resistor connected from emitter to ground
C)
a capacitor connected from base to ground
D)
a capacitor connected from emitter to ground
Based on established principles in the relevant subject area, the correct and most appropriate choice is 'a resistor connected from base to ground' (Option A).
MES Jr. Grade • Paper-II
According to Boolean law: A + 1 = ?
A)
1
B)
A
C)
0
D)
A’
Based on established principles in Electrical / Electronics Engineering, the correct and most appropriate choice is 'A’' (Option D).
MES Jr. Grade • Paper-II
One electron charge is equal to
A)
925 × 10–31C
B)
1.6019 × 10-19C
C)
– 1.925 × 10–31C
D)
– 1.6019 × 10–19C
Based on established principles in the relevant subject area, the correct and most appropriate choice is '– 1.6019 × 10–19C' (Option D).
MES Jr. Grade • Paper-II
“Total electric flux through any closed surface is equal to the charge enclosed by that surface”. This is
A)
Lenz’s law
B)
Gauss’s law
C)
Maxwell’s law
D)
Faraday’s law
Based on established principles in Law, the correct and most appropriate choice is 'Gauss’s law' (Option B).
