Legal Metrology • Electrical Engineering Paper-I
Two coils in differential connection have self induction of 2 mH and 4 mH and a mutual inductance of 0.15mH. The equivalent inductance of the combination is
A)
5.7mH
B)
5.85 mH
C)
6mH
D)
6.15 mH
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is '5.7mH' (Option A).
Legal Metrology • Electrical Engineering Paper-I
One heater coil boils certain amount of water in 10 minutes and another coil in 15 minutes. In how much time the same water will be boiled if the two heaters are put in series.
A)
12.5min
B)
25min
C)
2.5 min
D)
None of the above
Series heater resistances add; if one boils in 10 min and another in 15 min at the same voltage, the combined time is proportional to R1+R2, giving 25 min.
Legal Metrology • Electrical Engineering Paper-I
The sensitivity of a moving coil galvanometer is 60 divisions/ampere. When a shunt is used, the sensitivity becomes 10 divisions/ampere. If the galvanometer resistance is 20Ω, the value of shunt is
A)
15Ω
B)
20Ω
C)
4Ω
D)
5Ω
Sensitivity ratio m=60/10=6, so the shunt R=Rg/(m−1)=20/5=4 Ω.
Legal Metrology • Electrical Engineering Paper-I
Which one of the following sets of equations is independent in Maxwell’s equations?
A)
The two curl equations
B)
The two divergence equations
C)
Both the curl and divergence equations
D)
The two curl equations combined with the continuity equation
In Maxwell's equations, the two curl equations combined with the continuity equation are independent.
Legal Metrology • Electrical Engineering Paper-I
Which one of the following materials can not be used for permanent magnets?
A)
Alnico
B)
Barium ferrite
C)
Carbon steel
D)
Iron cobalt alloy
Iron-cobalt alloys can be magnetically soft/high-saturation materials, whereas alnico, barium ferrite, and carbon steel can serve as permanent-magnet materials; D is the best choice.
Legal Metrology • Electrical Engineering Paper-I
The magnitudes of the open-circuit and short circuit input impedances of a transmission line are 100Ω and 25Ω respectively. The characteristic impedance of the line is,
A)
25Ω
B)
50Ω
C)
75Ω
D)
100Ω
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is '25Ω' (Option A).
Legal Metrology • Electrical Engineering Paper-I
The magnetization of a superconductor is
A)
0
B)
-B
C)
-1
D)
-H
A superconductor exhibits perfect diamagnetism: B≈0, so M=−H in SI.
Legal Metrology • Electrical Engineering Paper-I
In a perfect dielectric, wave propagation occurs
A)
with zero attenuation
B)
with small attenuation
C)
with large attenuation
D)
with infinite attenuation
Based on established principles in Electrical / Electronics Engineering, the correct and most clinically/technically appropriate choice is 'with zero attenuation' (Option A).
Legal Metrology • Electrical Engineering Paper-I
The Cauer Form II of a reactive network synthesis is the successful removal of
A)
Poles at infinity
B)
Zeros at infinity
C)
Poles at origin
D)
Zeros at origin
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Poles at origin' (Option C).
Legal Metrology • Electrical Engineering Paper-I
The magnetic flux density in an air-cooled coil is 10⁻³ Wb/m². With a cast iron of relative permeability 100 inserted, the flux density will become
A)
10⁻⁴ Wb/m²
B)
10⁻² Wb/m²
C)
10⁻¹ Wb/m²
D)
1 Wb/m²
With the same applied H, B=μH rises roughly in proportion to relative permeability, giving about 0.1 Wb/m².
Legal Metrology • Electrical Engineering Paper-I
When a semiconductor bar is heated at one end, a voltage across the bar is developed. If the heated end is positive, the semiconductor is
A)
P-type
B)
N-type
C)
Intrinsic
D)
Highly degenerate
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'N-type' (Option B).
Legal Metrology • Electrical Engineering Paper-I
When a particular mode is excited in a wave-guide, there appears an extra electric component in the direction of propagation. The resulting mode is
A)
Transverse-electric
B)
Transverse-magnetic
C)
Longitudinal
D)
Transverse-electromagnetic
A longitudinal electric-field component means the mode is transverse-magnetic (TM).
Legal Metrology • Electrical Engineering Paper-I
For an electromagnetic wave incident on a conducting medium, the depth of penetration
A)
is directly proportional to the attenuation constant
B)
is inversely proportional to the attenuation constant
C)
has a logarithmic relationship with the attenuation constant
D)
is independent of the attenuation constant
For a conducting medium, penetration depth δ=1/α, so it is inversely proportional to attenuation constant.
Legal Metrology • Electrical Engineering Paper-I
At very high temperatures, the mean free path and collision time in a conductor are proportional to
A)
1/T
B)
1/T²
C)
T
D)
Independent of T
At high temperature, conductor scattering increases; the relaxation time/mean free path decrease roughly inversely with temperature.
Legal Metrology • Electrical Engineering Paper-I
The unit of V x H is
A)
Ampere
B)
Ampere/meter
C)
Ampere/meter²
D)
Ampere-meter
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'Ampere' (Option A).
Legal Metrology • Electrical Engineering Paper-I
If two, two port networks are connected in parallel, then
A)
z parameters are added
B)
y parameters are added
C)
ABDC parameters are multiplied
D)
h parameters are added
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'y parameters are added' (Option B).
Legal Metrology • Electrical Engineering Paper-I
A magnet is kept in air surrounded by an iron ring. The magnetic lines of force from the magnet will be
A)
Crowded in the ring
B)
Crowded in air
C)
Evenly distributed
D)
None of the above
Iron provides a low-reluctance path, so magnetic flux lines crowd into the iron ring.
Legal Metrology • Electrical Engineering Paper-I
A dominant wave should have
A)
No phase shift
B)
No attenuation
C)
Highest cutoff frequency
D)
Lowest cutoff frequency
Based on established principles in Electrical / Electronics Engineering, the correct and most clinically/technically appropriate choice is 'Lowest cutoff frequency' (Option D).
Legal Metrology • Electrical Engineering Paper-I
The network function F(s) = s / ((s + 1)(s + 3)) represents an
A)
RC impedance
B)
RL impedance
C)
RC impedance and an RL impedance
D)
RC admittance and an RL impedance
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'RC impedance and an RL impedance' (Option C).
Legal Metrology • Computer Science & Engineering Paper-III
Total participation in ER Diagram is represented by
A)
Double lines
B)
Dashed lines
C)
Singleline
D)
Triangle
In the context of Computer Science & Engineering, the most appropriate and technically accurate answer is 'Triangle' (Option D).
Legal Metrology • Computer Science & Engineering Paper-III
The standard followed by Ethernet is
A)
IEEE 802.10
B)
IEEE 802.11
C)
IEEE 802.5
D)
IEEE 802.3
Ethernet is standardized by IEEE 802.3.
Legal Metrology • Computer Science & Engineering Paper-III
FDDI is
A)
Bus based network
B)
Mesh network
C)
Star network
D)
Ringnetwork
FDDI (Fiber Distributed Data Interface) uses a dual ring topology.
Legal Metrology • Computer Science & Engineering Paper-III
Which of the following is true regarding waterfall model of software development?
A)
A reasonable approach when requirements are well defined
B)
A good approach when a working program is required quickly
C)
A best approach to use for projects with large development teams
D)
Anold fashioned model rarely used now
In the context of Computer Science & Engineering, the most appropriate and technically accurate answer is 'A good approach when a working program is required quickly' (Option B).
Legal Metrology • Computer Science & Engineering Paper-III
Which of the following is not a guided medium?
A)
Atmosphere
B)
Coaxial cable
C)
Fiber optic cable
D)
Twisted pair cable
The atmosphere is an unguided transmission medium; coax, fiber, and twisted pair are guided.
Legal Metrology • Computer Science & Engineering Paper-III
An relationship among students and courses is
A)
1:1 relationship
B)
1:Mrelationship
C)
M:1 relationship
D)
M:M relationship
Many students can enroll in many courses, representing a Many-to-Many (M:M) relationship.
