MES Departmental • 2025 • Engineering Paper-II
The motor’s nameplate power rating should always be _____ the power required to drive the pump at its design condition.
A)
less than
B)
equal to
C)
greater than
D)
half of
Option C is correct: greater than.
MES Departmental • 2025 • Engineering Paper-II
For having the highest fin effectiveness for heat transfer, the fins should be:
A)
Long and thin
B)
Short and thick
C)
Short and thin
D)
Long and thick
Option A is correct: Long and thin.
MES Departmental • 2025 • Engineering Paper-II
Which of the following is an advantage of multi-stage air compression?
A)
Increased leakage loss
B)
Reduced work input
C)
Lower volumetric efficiency
D)
Increased discharge temperature
Option B is correct: Reduced work input.
MES Departmental • 2025 • Engineering Paper-II
Restricted Earth Fault (REF) protection covers faults in:
A)
The entire winding
B)
Part of the winding between neutral and tapping point
C)
Only the HV side
D)
Only the LV side
Option B is correct: Part of the winding between neutral and tapping point.
MES Departmental • 2025 • Engineering Paper-II
Which relay protects the transformer from external short circuits and overloads?
A)
Differential Relay
B)
Buchholz Relay
C)
Overcurrent Relay
D)
Thermal Relay
Option C is correct: Overcurrent Relay.
MES Departmental • 2025 • Engineering Paper-II
How does earthing contribute to system stability?
A)
By introducing resistance in the neutral
B)
By providing a stable reference point (zero potential) for the system
C)
By increasing system impedance
D)
By creating an isolated neutral
Option B is correct: By providing a stable reference point (zero potential) for the system.
MES Departmental • 2025 • Engineering Paper-II
When is the efficiency of a transformer maximum?
A)
At no load
B)
When copper loss equals iron loss
C)
At half load
D)
When voltage is maximum
Option B is correct: When copper loss equals iron loss.
MES Departmental • 2025 • Engineering Paper-II
What is the purpose of a hoisting chain?
A)
To transfer power between sprockets
B)
To lift heavy loads and materials
C)
To transmit motion in a machine
D)
To measure distances on a field
Option B is correct: To lift heavy loads and materials.
MES Departmental • 2025 • Engineering Paper-II
What does a high specific speed for a turbine imply?
A)
The turbine will have a larger size for the same power output compared to an impulse turbine.
B)
The turbine is better suited for high-head, low-flow applications.
C)
The turbine is likely an impulse turbine.
D)
The turbine will be smaller in size and will generate more power for the same head
Option D is correct: The turbine will be smaller in size and will generate more power for the same head.
MES Departmental • 2025 • Engineering Paper-II
Before starting the electric motor of a centrifugal pump, which action is mandatory?
A)
Ensuring the delivery valve is open
B)
Checking that the pump is properly primed
C)
Adjusting the speed of the motor to maximum
D)
Closing the suction valve
Option B is correct: Checking that the pump is properly primed.
MES Departmental • 2025 • Engineering Paper-II
A major constraint for substation location is proximity to:
A)
River crossings
B)
Industrial zones
C)
Airports & defense establishments
D)
Agricultural lands
Option C is correct: Airports & defense establishments.
MES Departmental • 2025 • Engineering Paper-II
What is the primary instrument used specifically for measuring earth resistance?
A)
Ammeter
B)
Voltmeter
C)
Earth Tester (or Ground Resistance Tester)
D)
Frequency Meter
Option C is correct: Earth Tester (or Ground Resistance Tester).
MES Departmental • 2025 • Engineering Paper-II
Which of the following is a correct statement?
A)
A flywheel regulates speed during one cycle while the governor regulates speed from cycle to cycle.
B)
The flywheel is an essential element of every prime mover.
C)
A flywheel controls the quantity or quality of the working agent.
D)
A governor regulates speed by storing kinetic energy.
Option A is correct: A flywheel regulates speed during one cycle while the governor regulates speed from cycle to cycle..
MES Departmental • 2025 • Engineering Paper-II
What is the primary protection for Power transformers against internal faults?
A)
Fuse Protection
B)
Overcurrent Relay
C)
Differential Protection (Main) & Gas (Buchholz) Protection
D)
Thermal Relay
Option C is correct: Differential Protection (Main) & Gas (Buchholz) Protection.
MES Departmental • 2025 • Engineering Paper-II
For a head of 10-70 meters, which turbine is the most suitable choice?
A)
Pelton Turbine
B)
Kaplan Turbine
C)
Francis Turbine
D)
None of the above
Option C is correct: Francis Turbine.
MES Departmental • 2025 • Engineering Paper-II
What is the primary purpose of laminating a transformer core?
A)
To increase flux density
B)
To reduce eddy current losses.
C)
To improve insulation
D)
To increase mechanical strength
Option B is correct: To reduce eddy current losses..
MES Departmental • 2025 • Engineering Paper-II
Which of the following is a necessary component for a centrifugal pump to be able to self-prime?
A)
A draft tube
B)
A separate priming chamber or internal suction stage
C)
A larger impeller
D)
A high-speed motor
Option B is correct: A separate priming chamber or internal suction stage.
MES Departmental • 2025 • Engineering Paper-II
Where is cavitation most likely to occur in a hydraulic turbine?
A)
At the inlet of the penstock.
B)
On the surface of the runner vanes.
C)
At the inlet of the draft tube.
D)
On the casing of the turbine.
Option C is correct: At the inlet of the draft tube..
MES Departmental • 2025 • Engineering Paper-II
What is the main goal of preventive maintenance in an outdoor substation?
A)
To fix faults immediately after they occur.
B)
To identify and rectify potential issues before they cause failure, ensuring reliability.
C)
To repaint everything every few years.
D)
To replace all equipment every decade
Option B is correct: To identify and rectify potential issues before they cause failure, ensuring reliability..
MES Departmental • 2025 • Engineering Paper-II
The function of a protective relay is to:
A)
Detect the fault and initiate the operation of the circuit breaker
B)
Absorb the fault current
C)
Step down the voltage for metering
D)
Provide an alarm only during a fault
Option A is correct: Detect the fault and initiate the operation of the circuit breaker.
MES Departmental • 2025 • Engineering Paper-II
Which protection scheme is generally recommended for Power transformers with a rating above 5MVA?
A)
Over-current protection
B)
Differential protection
C)
Restricted Earth Fault protection
D)
Buchholz relay
Option B is correct: Differential protection.
MES Departmental • 2025 • Engineering Paper-II
Testing of a newly installed turbine is often performed to ensure it meets the manufacturer’s guaranteed performance and efficiency under specific operating conditions, also known as
A)
Commissioning tests
B)
Maintenance tests
C)
Research tests
D)
Reliability tests
Option A is correct: Commissioning tests.
MES Departmental • 2025 • Engineering Paper-II
What is the primary purpose of specific speed (N) of a centrifugal pump?
A)
To determine the pump’s power consumption.
B)
To determine the pump’s hydraulic efficiency.
C)
To compare the performance of different pumps and characterize their design.
D)
To calculate the pump’s flow rate at different speeds.
Option C is correct: To compare the performance of different pumps and characterize their design..
MES Departmental • 2025 • Engineering Paper-II
The common type of storage battery generally used in electric power stations is the:
A)
Nickel-cadmium battery
B)
Zinc-carbon battery
C)
Lead-acid battery
D)
Lithium-ion battery
Option C is correct: Lead-acid battery.
MES Departmental • 2025 • Engineering Paper-II
What is one of the main indicators that a centrifugal pump is experiencing cavitation?
A)
A steady, high-pitched whine
B)
A sudden increase in discharge pressure
C)
A rattling or hammering noise
D)
Smooth, vibration-free operation
Option C is correct: A rattling or hammering noise.
