MES Departmental • 2025 • Paper-II
Briefly mention different methods of improving Earth Resistance?
MES Departmental • 2025 • Paper-II
The skin effect depends upon
A)
temperature
B)
humidity
C)
frequency
D)
line span
Option C is correct: frequency.
MES Departmental • 2025 • Paper-II
Thyristor is basically
A)
SCR
B)
Triac
C)
All PNPN devices
D)
Both SCR and Triac
Option C is correct: All PNPN devices.
MES Departmental • 2025 • Paper-II
The most convenient way of achieving large capacitance is by using-
A)
multiplate construction
B)
decrease distance between plates
C)
air as dielectric
D)
dielectric of low permitivity
Option A is correct: multiplate construction.
MES Departmental • 2025 • Paper-II
A zener diode is used as -
A)
an amplifier
B)
a rectifier
C)
a voltage regulator
D)
a multivibrator
Option C is correct: a voltage regulator.
MES Departmental • 2025 • Paper-II
The direction of induced e.m.f in a conductor (or coil) can be determined by-
A)
work law
B)
Ampere’s law
C)
Fleming’s right hand rule
D)
Fleming’s left hand rule
Option C is correct: Fleming’s right hand rule.
MES Departmental • 2025 • Paper-II
Delta/Star or star/delta transformation technique is applied to -
A)
one terminal network
B)
two terminal network
C)
three terminal network
D)
four terminal network
Option C is correct: three terminal network.
MES Departmental • 2025 • Paper-II
Insulation resistance of 6.3MVA, 33/11kV transformer is measured between HV and LV and the result obtained is shown below: (a) 41.40 after 10 minutes, (b) 20.70 after 1 minutes, (c) 11.60 after 15 seconds. Calculate the Polarization Index (PI) value and the Dielectric Absorption Ratio (DAR) value?
MES Departmental • 2025 • Paper-II
What are the differences between power transformers and distribution transformers?
MES Departmental • 2025 • Paper-II
A length of wire has a resistance of 6 ohms. The resistance of a wire of the same material three times as long and twice the cross-sectional area will be
A)
36 ohms
B)
9 ohms
C)
1 ohm
D)
12 ohms
Option C is correct: 1 ohm.
MES Departmental • 2025 • Paper-II
The superposition theorem is used when the circuit contains
A)
a single voltage source
B)
a number of voltage sources
C)
passive elements only
D)
active elements only
Option B is correct: a number of voltage sources.
MES Departmental • 2025 • Engineering Paper-II
Which of the following transmission media is most immune to electromagnetic interference (EMI)?
A)
Twisted Pair
B)
Coaxial Cable
C)
Optical Fiber
D)
Infrared
Option C is correct: Optical Fiber.
MES Departmental • 2025 • Engineering Paper-II
What are firewalls and VPNs? How do they enhance network security, and what are their key functions?
MES Departmental • 2025 • Engineering Paper-II
What are the differences between hierarchical, network, and relational data models? Provide a use-case example where each model would be best suited.
MES Departmental • 2025 • Engineering Paper-II
How are hydroelectric power stations divided on the basis of head of water? Mention the heads and type of turbines recommended.
MES Departmental • 2025 • Engineering Paper-II
HTTP is a:
A)
Stateless protocol
B)
Stateful protocol
C)
Connection-oriented protocol
D)
Real-time protocol
Option A is correct: Stateless protocol.
MES Departmental • 2025 • Engineering Paper-II
Explain direct and indirect lightning strike? Mention how transformer must be protected from lightning.
MES Departmental • 2025 • Engineering Paper-II
Briefly mention different methods of improving Earth Resistance.
MES Departmental • 2025 • Engineering Paper-II
Which of the following is a key characteristic of a relational database model?
A)
Pointers to navigate between tuples
B)
Object inheritance
C)
Tables with rows and columns
D)
Trees representing relationships
Option C is correct: Tables with rows and columns.
MES Departmental • 2025 • Engineering Paper-II
Which of the following SQL data types is used for variable-length character strings?
A)
INT
B)
VARCHAR
C)
CHAR
D)
TEXT
Option B is correct: VARCHAR.
MES Departmental • 2025 • Engineering Paper-II
Which type of join returns only the matching rows from two tables?
A)
LEFT JOIN
B)
OUTER JOIN
C)
FULL JOIN
D)
INNER JOIN
Option D is correct: INNER JOIN.
MES Departmental • 2025 • Engineering Paper-II
How can we classify overhead transmission lines? Briefly describe how line constants are considered in each case?
MES Departmental • 2025 • Engineering Paper-II
Which of the following best describes the difference between a schema and an instance?
A)
Schema changes frequently, instance rarely changes
B)
Schema is a snapshot of data, instance is the metadata
C)
Schema is the logical structure, instance is the actual content at a given time
D)
Instance is permanent, schema is temporary
Option C is correct: Schema is the logical structure, instance is the actual content at a given time.
MES Departmental • 2025 • Engineering Paper-II
What are the differences between power transformers and distribution transformers?
MES Departmental • 2025 • Engineering Paper-II
A condition for deadlock to occur that involves resource holding without release is:
A)
Circular wait
B)
Mutual exclusion
C)
Hold and wait
D)
No preemption
Option C is correct: Hold and wait.
