Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
The creep in belt drive is due to-
A)
Power fluctuation
B)
Thickness of the belt
C)
Unequal tension in tight and slack side of the belt
D)
Equal size of the pulleys
Option C is correct: Unequal tension in tight and slack side of the belt.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
The clearance volume of air compressor is kept minimum because-
A)
It allows maximum compression to be achieved
B)
It greatly affects volumetric efficiency
C)
It results in minimum work
D)
It permits isothermal compression
Option B is correct: It greatly affects volumetric efficiency.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
Cavitation in hydraulic turbine results in-
A)
Noise and vibration
B)
reduction and discharge
C)
drop in output and efficiency
D)
rough surfaces
Option C is correct: drop in output and efficiency.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
Governing mechanism used in case of Francis and Kaplan turbines is-
A)
Guide vane
B)
Nozzle needle
C)
Control valve
D)
Dam gates
Option A is correct: Guide vane.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
Centrifugal pump is started with its delivery valve-
A)
kept fully closed
B)
kept fully opened
C)
irrespective of any position
D)
kept 50% opened
Option A is correct: kept fully closed.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
On what principal does a reciprocating pump work?
A)
Centrifugal force
B)
Rotation of impeller to develop lifting pressure
C)
Create a reciprocating motion by sucking and discharge of fluid by using piston
D)
Forced vortex flow
Option C is correct: Create a reciprocating motion by sucking and discharge of fluid by using piston.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
One ton of the refrigeration is-
A)
the standard unit used in refrigeration problems
B)
the cooling effect produced by melting 1ton of ice
C)
the refrigeration effect to freeze 1ton of water at 0°C into ice at 0°C in 24 Hours
D)
the refrigeration effect to produce 1ton of ice at Normal temperature and pressure condition
Option C is correct: the refrigeration effect to freeze 1ton of water at 0°C into ice at 0°C in 24 Hours.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
On a heat transfer surface, extended surfaces (fins) are provided to-
A)
increase temperature gradient so as to enhance heat transfer
B)
increase turbulent inflow for enhancing heat transfer
C)
increase surface area to promote the rate of heat transfer
D)
decrease the pressure drop of the fluid
Option C is correct: increase surface area to promote the rate of heat transfer.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
In centrifugal pumps, maximum efficiency is obtained when the blades are-
A)
Straight
B)
bent forward
C)
bent backward
D)
radial
Option C is correct: bent backward.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
The specific speed of a centrifugal pump is given by-
A)
NVQ / H
B)
NVQ / H^3
C)
NVQ / H^3 (approx based on text)
D)
He
Option C is correct: NVQ / H^3 (approx based on text).
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
Draft tube at the exit of a Reaction turbine used for hydroelectric project is-
A)
above or below the water surface, depends on unit speed of the turbine
B)
always above the water surface
C)
always immersed in water
D)
may either be below or above the water surface
Option C is correct: always immersed in water.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
Efficiency of gas turbine is increased by-
A)
reheating
B)
intercooling
C)
adding a regenerator
D)
all of the above
Option D is correct: all of the above.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
Which type of transformer are used in arc welding?
A)
Toroidal
B)
Auto-transformer
C)
Step up transformer
D)
Step down transformer
Option D is correct: Step down transformer.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
Rotary air compressor is best suited for-
A)
Large quantity of air at high pressure
B)
Small quantity of air at high pressure
C)
Small quantity of air at low pressure
D)
Large quantity of air at low pressure
Option D is correct: Large quantity of air at low pressure.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
The two types of pulleys in a hydraulic lift are-
A)
fixed, fixed
B)
moveable, fixed
C)
moveable, moveable
D)
semi-movable, moveable
Option B is correct: moveable, fixed.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
Multi-stage centrifugal pumps are used to obtain-
A)
High discharge
B)
High head
C)
Pumping of viscous fluids
D)
High head and high discharge
Option B is correct: High head.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
What is the principle of equipment selection in terms of material handling?
A)
For planning the material handling process to make handling work easy and simple
B)
use gravity force for transporting material
C)
select handling equipments as per the quantity and type of load
D)
by eliminating unnecessary movement of material and equipment
Option C is correct: select handling equipments as per the quantity and type of load.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
Francis, Kaplan and propeller turbines fall under the category of-
A)
Impulse turbine
B)
Reaction turbines
C)
Axial flow turbines
D)
Mixed flow turbines
Option B is correct: Reaction turbines.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
If requirement of Net Positive Suction Head (NPSH) of a centrifugal pump is not satisfied-
A)
Pump will not develop head
B)
Pump will be cavitated
C)
pump efficiency will be low
D)
no flow will take place
Option B is correct: Pump will be cavitated.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
Grinding operation is used for-
A)
removing material
B)
shaping
C)
dressing
D)
finishing
Option D is correct: finishing.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
Break-even analysis shows profit when-
A)
sales revenue > total cost (i.e. fixed cost + variable cost)
B)
sales revenue = total cost (i.e. fixed cost + variable cost)
C)
sales revenue < total cost (i.e. fixed cost + variable cost)
D)
variable cost < fixed cost
Option A is correct: sales revenue > total cost (i.e. fixed cost + variable cost).
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
The function of a governor is to-
A)
store energy and give up whenever required
B)
regulate the speed during one cycle of a prime mover
C)
decrease variation of speed
D)
adjust variation of speed by varying the input to the engine
Option D is correct: adjust variation of speed by varying the input to the engine.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
Role of pump testing is-
A)
To measure pressure, flow rates and speeds
B)
To measure input and output power
C)
To measure noise emissions, strength levels and vibrations
D)
All of the above
Option D is correct: All of the above.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
Gas turbines for power generation are normally used-
A)
to supply based load requirements
B)
to supply peak load requirements
C)
to enable starting of thermal power plant
D)
when other sources of power fail
Option B is correct: to supply peak load requirements.
Departmental (other) • 2024 • Engineering Paper-II (Mechanical Engineer Under Electrical Wing)
A turbine pump is basically a centrifugal pump equipped additionally with-
A)
adjustable blades
B)
backward curved blades
C)
vaned diffusion casing
D)
inlet guide blades
Option D is correct: inlet guide blades.
