Legal Metrology • Paper-III
Vestigial sideband modulation is normally used for
A)
HF point-to-point communications
B)
Monaural broadcasting
C)
TV broadcasting
D)
Stereo broadcasting
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'TV broadcasting' (Option C).
Legal Metrology • Paper-III
Out of modes TE10 and TE01 of propagation of electromagnetic energy:
A)
Both have the same cut off frequency
B)
TE10 has lower cut off frequency as compared to TE01
C)
TE01 has lower cut off frequency as compared to TE10
D)
None of the above
For a rectangular guide with a>b, TE10 has the lower cutoff frequency than TE01.
Legal Metrology • Paper-III
What is the purpose of source coding in data compression?
A)
To encode data for transmission
B)
To reduce the redundancy in the source data
C)
To modulate carrier signals
D)
To improve signal-to-noise ratio
Based on established principles in this specific field of study, the correct and most clinically/technically appropriate choice is 'To reduce the redundancy in the source data' (Option B).
Legal Metrology • Paper-III
Which of the following elements are taken in Microwave circuits?
A)
Lumped Circuit Elements
B)
Distributed Circuit Elements
C)
Both (a) & (b)
D)
None of these
At microwave frequencies, dimensions are comparable to wavelength, so distributed elements/models are used.
Legal Metrology • Paper-III
Lens antennas are classified into two types. One being fast antenna, the other one is:
A)
slow antenna
B)
delay antenna
C)
dynamic antenna
D)
none of the mentioned
Based on established principles in this specific field of study, the correct and most clinically/technically appropriate choice is 'dynamic antenna' (Option C).
Legal Metrology • Paper-III
A major disadvantage of klystron amplifier is:
A)
low power gain
B)
low bandwidth
C)
high source power
D)
design complexity
Based on established principles in Electrical / Electronics Engineering, the correct and most clinically/technically appropriate choice is 'high source power' (Option C).
Legal Metrology • Paper-III
Statement (I): Coaxial cable is not preferred at microwave frequencies.
Statement (II): At microwave frequencies, coaxial cable has high attenuation.
A)
Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
B)
Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)
C)
Statement (I) is true but Statement (II) is false
D)
Statement (I) is false but Statement (II) is true
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)' (Option B).
Legal Metrology • Paper-III
___ is the best medium for handling the large microwave power.
A)
Coaxial line
B)
Rectangular wave guide
C)
Strip line
D)
Circular wave guide
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'Strip line' (Option C).
Legal Metrology • Paper-III
What is the maximum addressable memory capacity of the Intel 8085 microprocessor?
A)
64KB
B)
1MB
C)
16MB
D)
4GB
8085 has a 16-bit address bus, hence 2^16=64 KB maximum directly addressable memory.
Legal Metrology • Paper-III
As a conductor’s temperature increases, its resistance changes
A)
Inversely
B)
Exponentially
C)
Non-linearly
D)
Linearly
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'Non-linearly' (Option C).
Legal Metrology • Paper-III
An increase in the modulation index leads to increase in bandwidth in case of
A)
AM
B)
FM
C)
PM
D)
None of these
Increasing modulation index increases sideband spread/bandwidth in FM/PM; among the usual single-choice treatment, FM is keyed.
Legal Metrology • Paper-III
The following sequence of instructions are executed by an 8085 microprocessor:
1000: LXI SP, 27FF
1003: CALL 1006
1006: POPH
The contents of the stack pointer (SP) and the HL register pair on completion or execution of these instructions are:
A)
SP = 27FF, HL = 1003
B)
SP = 27FD, HL = 1003
C)
SP = 27FF, HL = 1006
D)
SP = 27FD, HL = 1006
CALL pushes the return address 1003H, decreasing SP from 27FFH to 27FDH; POP H restores SP to 27FFH and loads HL=1003H.
Legal Metrology • Paper-III
The solid area through which all the power radiated by the antenna is:
A)
beam area
B)
effective area
C)
aperture area
D)
beam efficiency
Beam area is the solid angle through which the antenna radiates essentially all of its power.
Legal Metrology • Paper-III
Consider the following statements:
Assertion (A): Microstrip is very commonly used in microwave integrated circuits.
Reason (R): Microstrip has an easy access to the top-surface so that active and passive discrete components can be easily mounted.
A)
Both A and R are correct and R is correct explanation of A
B)
Both A and R are correct but R is not correct explanation of A
C)
A is wrong but R is correct
D)
A is correct but R is wrong
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'A is correct but R is wrong' (Option D).
Legal Metrology • Paper-III
If the progressive shift in antenna array is equal to zero then it is called
A)
broad side
B)
end-fire
C)
yagi-uda
D)
fishbone antenna
Based on established principles in this specific field of study, the correct and most clinically/technically appropriate choice is 'broad side' (Option A).
Legal Metrology • Paper-III
Antennas that consist of a regular arrangement of antenna elements with a feed network is
A)
aperture antennas
B)
array antennas
C)
printed antennas
D)
wire antennas
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'array antennas' (Option B).
Legal Metrology • Paper-III
An ideal directional coupler has directivity, and insertion loss.
A)
infinity, zero
B)
zero, zero
C)
zero, infinity
D)
infinity, infinity
An ideal directional coupler has zero insertion loss and infinite directivity.
Legal Metrology • Paper-III
All to the following are non-volatile memories EXCEPT
A)
ROMs
B)
Semiconductor RAM
C)
PROM
D)
EPROMs
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'Semiconductor RAM' (Option B).
Legal Metrology • Paper-III
In a microprocessor with 16 address and 12 data lines, the maximum number of opcodes is
A)
2^0
B)
2^8
C)
2^2
D)
2^12
Based on established principles in Electrical / Electronics Engineering, the correct and most clinically/technically appropriate choice is '2^12' (Option D).
Legal Metrology • Paper-III
What is the purpose of the ALU (Arithmetic Logic Unit) in a CPU?
A)
To store program instructions
B)
To perform arithmetic and logic operations
C)
To manage memory access
D)
To control input/output devices
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'To store program instructions' (Option A).
Legal Metrology • Paper-III
In AM, if the modulation index is more than 100%, then
A)
Power of the wave increases
B)
The wave gets distorted
C)
Efficiency of transmission increases
D)
It remains the same
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'Efficiency of transmission increases' (Option C).
Legal Metrology • Paper-III
In FM broadcast, the maximum modulation frequency is restricted to
A)
5kHz
B)
10kHz
C)
15kHz
D)
20kHz
FM broadcast audio is limited to about 15 kHz.
Legal Metrology • Paper-III
The difference between the phase and frequency modulation
A)
is purely theoretical because they are the same in practice
B)
is too great to make the two systems compatible
C)
lies in the poorer audio response of phase modulation
D)
lies in the different definitions of the modulation index
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'is too great to make the two systems compatible' (Option B).
Legal Metrology • Paper-III
Which system is free from noise?
A)
FM
B)
AM
C)
Both FM & AM
D)
None of these
Neither AM nor FM is noise-free; FM merely gives better noise immunity.
Legal Metrology • Paper-III
With an increase in operating frequency, the background noise temperature:
A)
increases
B)
decreases
C)
remains constant
D)
remains unaffected
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'remains constant' (Option C).
