Labour Officer • 2026 • Paper-III
The instruction set of 8085 is:
A)
CISC
B)
RISC
C)
VLIW
D)
EPIC
Correct option A: CISC
Labour Officer • 2026 • Paper-III
The broadcast signals received at low frequencies during day-time are due to
A)
Space wave
B)
Ground wave
C)
Sky wave
D)
Tropospheric waves
Correct option B: Ground wave
Labour Officer • 2026 • Paper-III
The maximum memory addressable by 8086 is:
A)
64 KB
B)
1 MB
C)
16 MB
D)
4 GB
The 8086 is a 16-bit microprocessor with a 20-bit address bus. A 20-bit address bus can generate 2^20 different memory locations, which equals 1,048,576 bytes = 1 MB. Therefore, the maximum memory addressable by 8086 is 1 MB. 64 KB is the address space of a 16-bit address bus, while 16 MB and 4 GB are much larger capacities associated with later processors.
Labour Officer • 2026 • Paper-III
State and prove sampling theorem.
Labour Officer • 2026 • Paper-III
Information rate is:
A)
Entropy × symbol rate
B)
Bandwidth × SNR
C)
Noise × redundancy
D)
Carrier × modulation index
Correct option A: Entropy × symbol rate
Labour Officer • 2026 • Paper-III
Which of the architecture is power efficient?
A)
RISC
B)
ISA
C)
IANA
D)
CISC
RISC (Reduced Instruction Set Computer) architecture is generally more power efficient because it uses simpler instructions, smaller decoding logic, and often fewer transistors per operation. This reduces hardware complexity and energy consumption. CISC is usually less power efficient due to more complex instruction decoding and execution. ISA is not an architecture type in this context, and IANA is unrelated.
Labour Officer • 2026 • Paper-III
Which light source is commonly used in long-distance optical communication?
A)
LED
B)
Laser diode
C)
Lamp
D)
Phototransistor
Correct option B: Laser diode
Labour Officer • 2026 • Paper-III
Frequencies in the UHF range propagate by means of
A)
space wave
B)
surface waves
C)
sky waves
D)
ground waves
Correct option A: space wave
Labour Officer • 2026 • Paper-III
In 8086, the physical address is calculated as:
A)
Segment × 10H + Offset
B)
Segment + Offset
C)
Segment × 100H + Offset
D)
Segment – Offset
Correct option A: Segment × 10H + Offset
Labour Officer • 2026 • Paper-III
Calculate the transmission rate of TDM, if the link transmits 2000 frames per second, and each slot has 8 bits.
A)
64 Kbps
B)
16 Kbps
C)
8 Kbps
D)
32 Kbps
Correct option B: 16 Kbps
Labour Officer • 2026 • Paper-III
Derive the S- Matrix of an ideal E-plane Tee.
Labour Officer • 2026 • Paper-III
The minimum range of detection by a pulse radar depends on
A)
Pulse width
B)
Average transmitted power
C)
Beamwidth of the antenna
D)
All of the above
In a pulse radar, the minimum range is determined by the shortest distance at which a target can be detected before the transmitted pulse has finished and the receiver is still effectively blocked. This depends on the pulse width: a longer pulse means a larger minimum range. Average transmitted power affects detection range/visibility, and antenna beamwidth affects angular resolution, but neither directly sets the minimum range. Hence, the correct answer is pulse width.
Labour Officer • 2026 • Paper-III
Derive an expression for the bandwidth of a circular waveguide.
Labour Officer • 2026 • Paper-III
Explain the functioning of Magic Tee as tuner, duplexer and mixer.
Labour Officer • 2026 • Paper-III
Explain the importance of microwave antennas in communication.
Labour Officer • 2026 • Paper-III
What is the difference between TE and TM modes in waveguides?
Labour Officer • 2026 • Paper-III
The cutoff frequency of a waveguide depends on:
A)
Dimensions
B)
Material conductivity
C)
Operating power
D)
Noise figure
Correct option A: Dimensions
Labour Officer • 2026 • Paper-III
A directional coupler is used to:
A)
Sample a portion of power
B)
Amplify signals
C)
Convert frequency
D)
Reduce noise
Correct option A: Sample a portion of power
Labour Officer • 2026 • Paper-III
Define the term VSWR in microwave measurements.
Labour Officer • 2026 • Paper-III
Consider a discrete memoryless source with alphabet S = {s0, s1, s2, s3, s4, ...} and respective probabilities of occurrence P = {1/2, 1/4, 1/8, 1/16, 1/32, ...}. What is the entropy of the source (in bits)?
Labour Officer • 2026 • Paper-III
The information bit sequence {1 1 1 0 1 0 1 0 1} is to be transmitted by encoding with Cyclic Redundancy Check 4 (CRC-4) code, for which the generator polynomial is C(x) = x^4 + x + 1. What is the encoded sequence of bits?
Labour Officer • 2026 • Paper-III
Radar range primarily depends on
A)
Peak transmitted power
B)
Average transmitted power
C)
Independent of transmitted power
D)
Distance between ends
Radar maximum range is primarily determined by the transmitted signal strength, especially the peak transmitted power. In the radar range equation, received power depends on transmitted peak power, so increasing peak power increases detection range. Average power is less important for pulsed radar range compared to peak power. 'Independent of transmitted power' is incorrect because range clearly varies with transmitted power. 'Distance between ends' is unrelated to radar range.
Labour Officer • 2026 • Paper-III
VSWR = 1 indicates:
A)
Perfect matching
B)
High mismatch
C)
Infinite reflection
D)
Zero transmission
Correct option A: Perfect matching
Labour Officer • 2026 • Paper-III
Circular waveguides support:
A)
TE and TM modes
B)
TEM mode only
C)
TE mode only
D)
TM mode only
Correct option A: TE and TM modes
Labour Officer • 2026 • Paper-III
Slot antennas are commonly used in:
A)
Radar systems
B)
Audio broadcasting
C)
Optical communication
D)
HF radio
Correct option A: Radar systems
