Legal Metrology • Paper-III
___ is a connection that sends energy from one location to another.
A)
Transmission line
B)
Cable lines
C)
Fibre cable lines
D)
Modem line
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'Modem line' (Option D).
Legal Metrology • Paper-III
Three devices A, B and C have to be connected to an 8085 microprocessor. Device A has highest priority and device C has the lowest priority. In this context which of the following is correct assignment of interrupt inputs?
A)
A uses TRAP, B uses RST 5.5 and C uses RST 6.5
B)
A uses RST 7.5, B uses RST 6.5 and C uses RST 5.5
C)
A uses RST 5.5, B uses RST 6.5 and C uses RST 7.5
D)
A uses RST 5.5, B uses RST 6.5 and C uses TRAP
8085 interrupt priority is TRAP > RST7.5 > RST6.5 > RST5.5 > INTR, so A=RST7.5, B=RST6.5, C=RST5.5.
Legal Metrology • Paper-III
An impedance mismatch of the transmission line causes signal reflection, resulting in
A)
Insertion loss
B)
Reflection loss
C)
Transmission loss
D)
Return loss
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'Reflection loss' (Option B).
Legal Metrology • Paper-III
In a DM system, the granular noise occurs when modulating signal
A)
increases rapidly
B)
decreases rapidly
C)
changes within the step size
D)
has high frequency component
Granular noise occurs when the input varies by less than the step size, causing the staircase to hunt around the signal.
Legal Metrology • Paper-III
In multicavity klystron additional cavities are inserted between buncher and catcher cavities to achieve
A)
higher gain
B)
higher efficiency
C)
higher frequency
D)
higher bandwidth
Extra klystron cavities improve velocity modulation/bunching and therefore raise gain/efficiency; the standard answer is higher efficiency.
Legal Metrology • Paper-III
Amplitude modulation is used for broadcasting because
A)
it is more noise immune to noise than other modulation systems
B)
it avoids receiver complexity
C)
compared with other systems it requires less transmitting power
D)
no other modulation system can provide the necessary bandwidth for high fidelity
Based on established principles in Electrical / Electronics Engineering, the correct and most clinically/technically appropriate choice is 'it avoids receiver complexity' (Option B).
Legal Metrology • Paper-III
Which frequency range is typically associated with Ultra High-Frequency (UHF) radio waves?
A)
30 kHz - 300 kHz
B)
300 MHz - 3 GHz
C)
3 GHz - 30 GHz
D)
300 GHz - 3 THz
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is '3 GHz - 30 GHz' (Option C).
Legal Metrology • Paper-III
In a microprocessor when a CPU is interrupted, it
A)
Stops execution of instructions
B)
Acknowledges interrupt and branches of subroutine
C)
Acknowledges interrupt and continues
D)
Acknowledges interrupt and waits for the next instruction from the interrupting device
On an interrupt, the CPU acknowledges the request and transfers control to the corresponding interrupt service routine.
Legal Metrology • Paper-III
What is the decimal equivalent of the binary number 1101.0111?
A)
13.4375
B)
14.875
C)
11.011
D)
12.75
1101.0111₂ = 13 + 7/16 = 13.4375.
Legal Metrology • Paper-III
Microprocessor 8085 regains control of the bus
A)
immediately after HOLD goes low
B)
immediately after HOLD goes high
C)
after half-clock cycle after HLDA goes low
D)
after half-clock cycle after HLDA goes high
The processor regains the buses after HLDA is deasserted; the standard 8085 timing gives control back immediately after HLDA goes low.
Legal Metrology • Paper-III
In the Intel 8085 microprocessor, which register is used as a temporary register for various arithmetic and logic operations?
A)
Stack Pointer (SP)
B)
Program Counter (PC)
C)
Accumulator (A)
D)
Flag Register (F)
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'Program Counter (PC)' (Option B).
Legal Metrology • Paper-III
FM broadcast band lies in
A)
VHF band
B)
UHF band
C)
SHF band
D)
None of these
FM broadcast lies in the VHF band (88–108 MHz in many regions).
Legal Metrology • Paper-III
If the number of bits in input and output codes is 4 and 8 respectively for a ROM. Then the memory of this chip is equal to
A)
12 bits
B)
32 bits
C)
128 bits
D)
256 bits
A 4-bit address selects 16 words; at 8 bits each, capacity=16×8=128 bits.
Legal Metrology • Paper-III
The main advantage of superheterodyne receiver is
A)
simple circuit
B)
better tracking
C)
improvement in selectivity and sensitivity
D)
better alignment
The superheterodyne principle gives strong, stable selectivity and sensitivity at a fixed intermediate frequency.
Legal Metrology • Paper-III
What is the primary advantage of using single-mode optical fibre in long-distance communication?
A)
High data rate
B)
Low dispersion
C)
Low cost
D)
Robustness to bending
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'High data rate' (Option A).
Legal Metrology • Paper-III
Which one of the following is not a vectored interrupt?
A)
TRAP
B)
INTR
C)
RST 7.5
D)
RST 3
INTR is a non-vectored interrupt, meaning it relies on external hardware to supply the vector address.
Legal Metrology • Paper-III
In a microprocessor, the service routine for a certain interrupt starts from a Fixed location of memory which cannot be externally set, but the interrupt can be delayed or rejected. Such an interrupt is
A)
Non-maskable and non-vectored
B)
Maskable and non-vectored
C)
Non-maskable and vectored
D)
Maskable and vectored
Based on established principles in Electrical / Electronics Engineering, the correct and most clinically/technically appropriate choice is 'Non-maskable and vectored' (Option C).
Legal Metrology • Paper-III
The vectored address corresponding to the software interrupt RST 7 in 8085 is
A)
0017H
B)
0027H
C)
0038 H
D)
0700H
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is '0027H' (Option B).
Legal Metrology • Paper-III
Coupler that is mostly used in balanced amplifiers to achieve the required performance is:
A)
Branch line coupler
B)
Wilkinson coupler
C)
Lange coupler
D)
Waveguide coupler
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'Lange coupler' (Option C).
Legal Metrology • Paper-III
What happens when the radiation resistance of the antenna matches the characteristic impedance of the transmission line?
A)
no transmission occurs
B)
no reception occurs
C)
SWR is maximum
D)
SWR is minimum
Matched impedance gives Γ=0 and SWR=1, the minimum possible value.
Legal Metrology • Paper-III
A dipole antenna is also called as
A)
Marconi antenna
B)
Yagi antenna
C)
Bidirectional antenna
D)
Hertz antenna
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Bidirectional antenna' (Option C).
Legal Metrology • Paper-III
A magic-Tee is nothing but a
A)
Modification of E-plane tee
B)
Modification of H-plane tee
C)
Combination of E-plane and H-plane
D)
Two E-plane tees connected in parallel
A magic tee is a four-port junction combining E-plane and H-plane tee behavior.
Legal Metrology • Paper-III
What is the primary function of a microwave isolator in a microwave circuit?
A)
To combine signals of different frequencies
B)
To amplify microwave signals
C)
To prevent signal reflections
D)
To generate microwave signals
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'To combine signals of different frequencies' (Option A).
Legal Metrology • Paper-III
The following is NOT an advantage of FM over AM.
A)
noise immunity
B)
fidelity
C)
capture effect
D)
sputtering effect
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'noise immunity' (Option A).
Legal Metrology • Paper-III
The cavity magnetron uses strapping to
A)
Prevent mode jumping
B)
Ensure bunching
C)
Prevent cathode back-heating
D)
Improve the phase-focusing effect
Strapping in a cavity magnetron suppresses undesired modes and prevents mode jumping.
