MES Departmental • 2025 • Paper-I
Define what is ‘Renewable Rich State’ as describe in CEA (Deviation Settlement Mechanism and Related Matters) Regulations, 2014.
MES Departmental • 2025 • Paper-I
In a Guaranteed Standard, the Licensee shall restore supply in the case of distribution transformer failures by replacement of transformer in Class-I Cities & Urban Areas
A)
Within One day
B)
Within 48 Hours
C)
Within 12 Hours
D)
Within 3 days
Option B is correct: Within 48 Hours.
MES Departmental • 2025 • Paper-I
The condition of a generating station which is loaded but is not running at its declared availability is called as-
A)
Off Peak load
B)
Part Load
C)
Partial load
D)
Plant load
Option B is correct: Part Load.
MES Departmental • 2025 • Paper-II
Explain direct and indirect lightning strike? Mention how transformer must be protected from lightning
MES Departmental • 2025 • Paper-II
Inductive reactance is measured in ohms because it-
A)
reduces the amplitude of alternating current
B)
increases the amplitude of alternating current
C)
increases the amplitude of direct current
D)
has a back emf opposing a steady direct current
Option A is correct: reduces the amplitude of alternating current.
MES Departmental • 2025 • Paper-II
We have assigned a frequency of 50Hz to power system because -
A)
it can be easily obtained
B)
it gives best results when used for operating both lights and machinery
C)
it leads to easy calculations
D)
it is standardized
Option B is correct: it gives best results when used for operating both lights and machinery.
MES Departmental • 2025 • Paper-II
Nodal current analysis is based on-
A)
Kirchoff’s current law
B)
Kirchoff’s voltage law
C)
Maxwell’s law
D)
Millman’s law
Option A is correct: Kirchoff’s current law.
MES Departmental • 2025 • Paper-II
Two capacitors of capacitance 3 μF and 6 μF in series will have a total capacitance of-
A)
9 μF
B)
2 μF
C)
18 μF
D)
24 μF
Option B is correct: 2 μF.
MES Departmental • 2025 • Paper-II
The external PT ratio is 33000/110V and external CT ratio is 50/1A. If the energy meter is calibrated for PT ratio 33000/110V, CT ratio -/1A then what will be the multiplying factor for the meter?
MES Departmental • 2025 • 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 • Paper-II
What are the main functions of Capacitive Voltage Transformer (CVT)? At what system voltage CVT is used? How is the HV terminals of CVT connected?
MES Departmental • 2025 • Paper-II
The capacitance of a transmission line is neglected in case of-
A)
medium line
B)
long line
C)
short line
D)
extra long line
Option C is correct: short line.
MES Departmental • 2025 • Paper-II
How can we classify overhead transmission lines? Briefly describe how line constants are considered in each case?
MES Departmental • 2025 • Paper-II
The most difficult unbalanced three-phase load to deal with is-
A)
4-wire star connected unbalanced load
B)
unbalanced delta-connected load
C)
unbalanced 3-wire, star-connected load
D)
unbalanced 2-wire, star-connected load
Option C is correct: unbalanced 3-wire, star-connected load.
MES Departmental • 2025 • Paper-II
Corona effect
A)
causes power loss in the line
B)
causes interference in radio communication
C)
produces radio frequency waves
D)
all of the above
Option D is correct: all of the above.
MES Departmental • 2025 • Paper-II
On an overhead line, the wind load acts
A)
horizontally
B)
vertically downward
C)
vertically upward
D)
tangentially
Option A is correct: horizontally.
MES Departmental • 2025 • Paper-II
In an R-C series circuit, XC = R. The phase angle between applied voltage and circuit current is-
A)
30o
B)
45o
C)
60o
D)
90o
Option B is correct: 45o.
MES Departmental • 2025 • Paper-II
The AC system is preferred to DC system because-
A)
AC voltages can be easily changed in magnitude
B)
DC motors do not have fine speed control
C)
High-voltage AC transmission is less efficient
D)
DC voltages cannot be used for domestic appliances
Option A is correct: AC voltages can be easily changed in magnitude.
MES Departmental • 2025 • Paper-II
If one line conductor of a three-phase line is cut, the load is then supplied by-
A)
single phase
B)
two phase
C)
three phase
D)
line will trip
Option B is correct: two phase.
MES Departmental • 2025 • Paper-II
A 60o lagging power factor implies that the load is-
A)
inductive
B)
capacitive
C)
inductive or capacitive
D)
resistive
Option A is correct: inductive.
MES Departmental • 2025 • Paper-II
The basic requirement for inducing e.m.f in a coil is that -
A)
the flux should link the coil
B)
there should be change in flux linking the coil
C)
coil should form a closed loop
D)
coil should link the flux
Option B is correct: there should be change in flux linking the coil.
MES Departmental • 2025 • Paper-II
Two capacitors of capacitances C1 and C2 are connected in parallel. A charge Q given to them is shared. The ratio of charges Q1/Q2 is-
A)
C1 /C2
B)
C2 /C1
C)
C1 C2 /1
D)
1/ C1 C2
Option A is correct: C1 /C2.
MES Departmental • 2025 • Paper-II
The venin’s theorem is __________ form of an equivalent circuit.
A)
voltage
B)
current
C)
both voltage and current
D)
resistance
Option A is correct: voltage.
MES Departmental • 2025 • Paper-II
The stator of an alternator rarely uses __________ slots.
A)
wide open type
B)
semi-closed type
C)
closed type
D)
semi-open type
Option C is correct: closed type.
MES Departmental • 2025 • Paper-II
What are the difference between Control & Relay (C&R) panels and switchgears? At what voltage level switchgear is commonly used in Mizoram? Mention in which sub-station 33kV Switchgear is used owned by Mizoram?
