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Objective Questions

Latest JKPSC AE Mechanical Exam Question (Objective Questions), MCQ in English

Subjects : Mechanical

Question Bank JKPSC Assistant Engineer (Mechanical) Exam - English

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Mechanical

Question 1Single Answer

If a submerged body displaced from its equilibrium position, returns to its original position, it is called __________.

A
thermal equilibrium
B
neutral equilibrium
C
unstable equilibrium
D
stable equilibrium

Question 2Single Answer

In a flow measurement, a venturi meter is preferred over an orifice plate because _____.

A
energy of head loss is less
B
It is cheaper
C
pressure drop is more
D
space is limited

Question 3Single Answer

Pitot tube measures ______.

A
dynamic pressure of a moving stream
B
guage pressure
C
temperature of moving water
D
pressure difference between two fluids

Question 4Single Answer

Which of the following is not a property of an ideal fluid ?

A
flow is irrotational
B
it has no viscosity
C
it has viscosity
D
it is incompressible

Question 5Single Answer

Nozzle used in steam turbines convert ________.

A
enthalpy of steam into work
B
enthalpy of steam into kinetic energy
C
enthalpy of steam into pressure energy
D
pressure energy into work

Question 6Single Answer

Which of the following assumptions is the most relevant in air-standard cycle analysis ?

A
All the processes within the cycle are irreversible
B
Working fluid is a fixed mass
C
Specific heat of air changes during the cycle
D
Cycle is assumed to be an open cycle

Question 7Single Answer

The modern Francis turbine is a ___________flow turbine .

A
tangential
B
axial
C
radial
D
mixed

Question 8Single Answer

Variation of stress with strain rate for a Newtonian fluid is ______ .

A
hyperbolic
B
linear
C
elliptical
D
parabolic

Question 9Single Answer

Which of the following is NOT a part of refrigeration systems ?

A
Turbine
B
Evaporator
C
Compressor
D
Condenser

Question 10Single Answer

Which of the following is NOT an intensive property ?

A
Temperature
B
Total volume
C
Pressure
D
Density

Question 11Single Answer

Which of the following does NOT represent a unit of viscosity ?

A
Stoke
B
Poise
C
m²/sec
D
N-m/sec

Question 12Single Answer

__________ in the fuel is oxidised during knocking .

A
Hydrocarbon
B
Phosphorous
C
Water
D
Coal

Question 13Single Answer

_________ is defined as the ability of a material to resist deformation under action of an external load .

A
Stiffness
B
Resilience
C
Brittleness
D
Toughness

Question 14Single Answer

Draught is produced in locomotive boilers by which of the following components ?

A
Locomotive
B
Steam jet
C
Centrifugal fan
D
Chimney

Question 15Single Answer

For a steady flow, the value of all fluid properties at any fixed point _________ .

A
do not change with location
B
change with time
C
change with location
D
do not change with time

Question 16Single Answer

For a floating body, if the metacentre is below the centre of gravity, then the body is said to be __________ equilibrium .

A
thermal
B
stable
C
unstable
D
neutral

Question 17Single Answer

________ is useful for measuring flow of a conducting fluid .

A
Orifice meter
B
Rotameter
C
Vane meter
D
Electro-magnetic flow meter

Question 18Single Answer

A two- stroke engine consists of ________ port (s)

A
Three
B
Four
C
One
D
Two

Question 19Single Answer

Air Cooling is mostly preferred for _________ .

A
heavy truck
B
buses
C
moto cycles
D
multi-utility vehicles

Question 20Single Answer

_______ valves are provided in reciprocating compressors .

A
Simply supported
B
Solenoid
C
Plate
D
Poppet

Question 21Single Answer

Benson boiler have ______ water drum (s)

A
One
B
Zero
C
Three
D
Two

Question 22Single Answer

_________ is used for pumping water into a boilers .

A
Economiser
B
Duplex pump
C
Feed pump
D
Rotor

Question 23Single Answer

The function of a carburetor in internal combustion engines is :

A
to control fuel alone
B
to cool exhaust gases
C
to maintain air-fuel ratio
D
to control air alone

Question 24Single Answer

The device which transfers energy from the ______ to _____ the is known as hydraulic turbine .

A
atmosphere; fluid
B
rotor; fluid
C
fluid; rotor
D
fluid; atmosphere

Question 25Single Answer

The flash chamber in the single stage VCR cycle serves to ________ .

A
decrease the compression ratio
B
increase the refrigerating effect
C
increase the compression ratio
D
decrease the refrigerating effect

Question 26Single Answer

Define thermodynamics .

A
It is a science which deals with the relation between heat, work and properties of systems
B
It is a science which deals with work done
C
It deals with dynamics under thermal conditions
D
It is science which deals with the relation between work and properties

Question 27Single Answer

Which of the following statements is correct about a Benson boiler ?

A
Air is sent through the same direction
B
There is no recirculation of water
C
Steam is sent out in multiple directions
D
Flue gases pass only in one direction

Question 28Single Answer

Within a refrigeration system, the expansion valve is incorporated between the ________ .

A
Super-heater and sub-cooler
B
compressor and condenser
C
evaporator and compressor
D
condenser and evaporator

Question 29Single Answer

The reversed ______ cycle employed for passenger aircraft systems .

A
Carnot
B
Atkinson
C
Ericsson
D
Brayton

Question 30Single Answer

Fusible plug in a steam boiler is placed ______ .

A
below the water level indicator
B
at he crown of the furnace
C
at the fire grate of the boiler
D
near the manhole

Question 31Single Answer

Aqua ammonia solution used in a vapour absorption refrigeration system is a solution of ammonia in ________ .

A
CF₃
B
LiBr
C
H₂O₂
D
H₂O

Question 32Single Answer

Coated electrodes are used in ______ .

A
gas tungsten arc welding
B
submerged arc welding
C
tungsten insert gas welding
D
shielded metal arc welding

Question 33Single Answer

Where is air cycle refrigeration commonly used ?

A
Domestic refrigerator
B
Cold storage
C
Aircraft conditioning
D
Car air conditioning

Question 34Single Answer

________, is not a water tube boiler .

A
Benson boiler
B
Babcock-Wilcox boiler
C
Stirling boiler
D
Scotch marine

Question 35Single Answer

Stoke is another unit of -

A
kinematic viscosityy
B
velocity gradient
C
Shear stress
D
dynamic viscosit

Question 36Single Answer

For a refrigerating machine, capacity is expressed as ______ .

A
the lowest temperature attained
B
inside volume of the cabinet
C
gross weight of the machine
D
rate of heat extraction from the space being cooled

Question 37Single Answer

The value of quality or dryness fraction of a substance in saturated liquid-vapor mixture is ________ .

A
1
B
2
C
Zero
D
between Zero and 1

Question 38Single Answer

Uniform flow is the type of flow where in velocity at any given time ________- with respect to space .

A
Decreases
B
Does not change
C
Increases
D
Changes

Question 39Single Answer

______ falls under the category of a water tube boiler .

A
Locomotive boiler
B
Lancashire boiler
C
Cornish boiler
D
LaMont boiler

Question 40Single Answer

Chaplets are used in ________ .

A
forging
B
casting
C
welding
D
extrusion

Question 41Single Answer

Which of the following is NOT a unit of pressure ?

A
Pa
B
Bar
C
N/m²
D
Joule

Question 42Single Answer

What was the first refrigerant used in continuous refrigeration system ?

A
Ammonia
B
Water
C
Air
D
Carbon dioxide

Question 43Single Answer

For a 2 m deep swimming pool, pressure difference between the top and the bottom of the pool is ________ kPa .

A
22
B
19.6
C
11
D
12

Question 44Single Answer

Pressure measurement is done by ____. by measuring heat loss from a heated wire .

A
A pirani gauge
B
a manometer
C
a barometer
D
an orifice meter

Question 45Single Answer

In the Rankine cycle, the fluid which enters the boiler is :

A
water
B
steam
C
mercury
D
oxygen

Question 46Single Answer

Percentage elongating measured during tensile testing indicates _____ .

A
malleability
B
fatigue strength
C
creep
D
ductility

Question 47Single Answer

For a given centrifugal pump, discharge varies _______ with speed .

A
fifth power of
B
linearly
C
inversely
D
square root of

Question 48Single Answer

Foaming is a phenomenon that occurs in the boiler feed water due to _____ .

A
nitrogen peroxide
B
manganese
C
sodium chloride
D
oil

Question 49Single Answer

Compounding of a steam turbine is done to ______ .

A
balance the rotor
B
reduce the rotor speed
C
reduce the blade friction
D
connect the shaft

Question 50Single Answer

Any change in entropy could be achieved by changing______ .

A
velocity
B
heat
C
acceleration
D
mass

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Mechanical

Question 51Single Answer

Smoke emitting from a lighted cigarette represents ________ .

A
point
B
pathline
C
streakline
D
streamline

Question 52Single Answer

The splash system is NOT used to lubricate _______ .

A
tappets
B
camshafts
C
gear teeth and roller bearings
D
piston rings

Question 53Single Answer

A dead weight tester is used widely for ______ .

A
producing high pressures
B
accurate measurement of loads
C
calibration of another equipment
D
testing magnitude of the given weight

Question 54Single Answer

_______ CANNOT be classified as inversion (s) of a single-slider crank mechanism .

A
Elliptical trammel
B
Whitworth quick-return mechanism
C
Oscillating cylinder engine
D
Crank and slotted-lever mechanism

Question 55Single Answer

Which of the following is NOT a part of Rankine cycle ?

A
Pump
B
Compressor
C
Boiler
D
Turbine

Question 56Single Answer

A power plant that uses a gas turbine followed by a steam turbine for necessary power generation is known as __________ cycle power plant .

A
combined
B
bottom
C
generation
D
topping

Question 57Single Answer

In the context of properties of steel, which of the following statement is highly relevant ?

A
Presence of carbon contents imparts strength to iron
B
Presence of carbon does not influence the heat-treatment process
C
Presence of manganese decreases strength.
D
Presence of sulphide improves corrosion resistance

Question 58Single Answer

Those pumps employed for mud related work have ______ type of impeller .

A
an open
B
a two-side shrouded
C
a double-suction
D
a one-side shrouded

Question 59Single Answer

If the oil viscosity increased, then the wear loss _________ .

A
increases
B
becomes zero
C
decreases
D
remains the same

Question 60Single Answer

Impact load is an example of :

A
uniform load
B
static load
C
dynamic load
D
fatigue load

Question 61Single Answer

Internal energy associated with kinetic energy of molecules is ______ .

A
latent energy
B
nuclear energy
C
sensible energy
D
chemical energy

Question 62Single Answer

A capillary tube is employed in a refrigeration cycle to _______ .

A
produce a cooling effect
B
control temperature of the refrigerated space
C
reduce pressure of the refrigerant
D
control flow of the refrigerant

Question 63Single Answer

The Babcock-Wilcox boiler is classified as a water tube boiler because :

A
it has a large reservoir of water at the bottom
B
water passes around the tubes having hot gases
C
water heater is mounted on the boiler itself
D
water passes through the tube and hot gases around

Question 64Single Answer

Otto cycle of a car engine consists of :

A
two isochore and two reversible adiabatic cycles
B
four adiabatic cycles
C
one isochore cycle only
D
one adiabatic cycle only

Question 65Single Answer

When hot air exhausting from the turbine is used to heat up the compressor exit flow, it is knows as _______ .

A
regeneration
B
re-evaporating
C
intercooling
D
intracooling

Question 66Single Answer

If the specific gravity of oil is 0.7, then its density in kg/m³ will be _______ .

A
700
B
7
C
70
D
7000

Question 67Single Answer

viscous forces are NOT available in _______ .

A
laminar flow
B
irrational flow
C
rotational flow
D
transitional flow

Question 68Single Answer

Which of the following is the most widely used fuel in boilers ?

A
Pulverised coal
B
Wood
C
Oil
D
Anthracite coal

Question 69Single Answer

If the relationship between shear stress of a fluid is NOT linear to the velocity gradient, then the fluid is :

A
a compressible fluid
B
a Newtonian fluid
C
a non-Newtonian fluid
D
an ideal fluid

Question 70Single Answer

In a Pelton wheel, jet ratio values are ________ .

A
More than 6
B
between 2 and 5
C
less than 1
D
less than or equal to 2

Question 71Single Answer

What is kinematic viscosity ?

A
It is the rate of change of shear stress
B
It is the ratio of dynamic viscosity to relative density
C
It is the ratio of dynamic viscosity to mass density
D
It is the rate of change of shear strain

Question 72Single Answer

The efficiency of an ideal diesel engine does NO directly depend on ______ .

A
the cut-off ratio
B
the compression ratio
C
the fluid pressure
D
the isentropic index

Question 73Single Answer

Which of the following equipment gives direct reading of fluid flow rates ?

A
Nutating disk flow meter
B
Hot wire anemometer
C
Rotameter
D
Orifice meter

Question 74Single Answer

The tendency of material to fracture without appreciable deformation is called ______ .

A
stiffness
B
plasticity
C
toughness
D
brittlensess

Question 75Single Answer

Lancashire boiler has ______ flue tube(s), whereas Cornish boiler has _____ flue tube (s) .

A
3 ; 2
B
2; 2
C
2; 1
D
1; 2

Question 76Single Answer

The maximum temperature in case of internal combustion engines is obtained at ______ .

A
end of the compression process
B
end of the expansion process
C
start of the compression process
D
start of the expansion process

Question 77Single Answer

The moisture content o steam at the turbine exit of a steam power plant operating on the Rankine cycle can be decreased by :

A
increasing boiler pressure
B
super cooling steam
C
decreasing boiler pressure
D
reheating steam

Question 78Single Answer

Which of the following is NOT a non-ferrous alloy ?

A
Stainless steel
B
Magnesium
C
Titanium
D
Aluminium

Question 79Single Answer

The flow is volute casing outside the rotating impeller of a centrifugal pump is :

A
forced vortex flow
B
radial flow
C
free vortex flow
D
axial flow

Question 80Single Answer

The compression ratio in ideal air standard cycles is the ratio of :

A
minimum pressure to maximum pressure
B
minimum volume to maximum volume
C
maximum pressure to minimum pressure
D
maximum volume to minimum volume

Question 81Single Answer

Two stroke engine consist of a combined process of _____ in a single stroke .

A
compression and expansion
B
suction and compression
C
suction and expansion
D
suction and exhaust

Question 82Single Answer

The density of fluid does NOT affect the working of ______ .

A
an electro-magnetic flow meter
B
a nozzle meter
C
a rotameter
D
an orifice meter

Question 83Single Answer

Which of the following processes is NOT part of an ideal Otto cycle ?

A
Isentropic expansion
B
Heat addition at constant volume
C
Isentropic compression
D
Heat addition at constant pressure

Question 84Single Answer

In which of the following types of compressors are the motor and compressor enclosed in the same housing ?

A
Open-type compressor
B
Hermetic compressor
C
Reciprocating compressor
D
Axial flow type compressor

Question 85Single Answer

An oil of specific gravity 0.7 is stored in a closed tank up to a height of 2m. What will be the gauge pressure at the bottom of the tank ?

A
0.14 MPa
B
1.4 MPa
C
0.014 MPa
D
14 MPa

Question 86Single Answer

If there is no change in pressure at any point of the system with time, then the system is said to be in :

A
chemical equilibrium
B
mechanical equilibrium
C
Phase equilibrium
D
thermal equilibrium

Question 87Single Answer

If Valve of dryness fraction is 0, it indicates that working fluid is at ______ .

A
Compressed liquid
B
Saturated liquid
C
saturated vapour
D
supreheated vapour

Question 88Single Answer

In the context of roto-dynamic machines, which of the following statements is correct ?

A
There will be a relative motion between the rotor vanes and the fluid
B
Linear momentum is the normal to the stator
C
Linear momentum is the direction normal to the rotor
D
While flowing through the stator. linear momentum changes

Question 89Single Answer

When two elements of a pair are connected such that they can only turn about a fixed axis of another element, they are called _______ .

A
a turning pair
B
a screw pair
C
a spherical pair
D
a sliding pair

Question 90Single Answer

In high-speed aircrafts flying at high altitudes, why is cooling of the cabin required even temperature outside is very low ?

A
Since outside pressure is very high
B
Due to absence of solar radiation
C
To improve fuel efficiency
D
Due to large internal heat generation

Question 91Single Answer

Fusible plug is generally made up of an alloy (gunmetal) which consists of copper, tin and _______ .

A
cast iron
B
zinc
C
aluminium
D
manganese

Question 92Single Answer

In the context of laminar flow, which of the following statement sis the most appropriate ?

A
Laminar flow is observed in high viscous fluids at low velocity
B
There will be an exchange of momentum from fluid particles of one layer of another layer
C
Flow is always through small tanks
D
Particles move in turbulent order

Question 93Single Answer

Which of the following statements is more relevant in the context ?

A
If center of gravity is below the centre of buoyancy, the body is unstable
B
Metacentric height is positive in case of unstable equilibrium
C
The centre of buoyancy in a submerged boy remains
D
When the body is fully submerged, shape of he displaced fluid alters when the body is tilted

Question 94Single Answer

Determinate the COP (coefficient of performance) of a heat pump if the rate of heat rejected is 360 kJ/min and power supplied is 2 kW .

Question 95Single Answer

Define free-body diagram

A
A figure that represent external forces acting on a body
B
A diagram that represents internal forces acting on a body
C
A free-hand sketch representing a body
D
A diagram that only represents moments acting on a body

Question 96Single Answer

A ball and socket joint is an example of a ________pair .

A
turning
B
screw
C
rolling
D
spherical

Question 97Single Answer

From among the given options, Poisson's ration is the highest for :

A
iron
B
wood
C
copper
D
rubber

Question 98Single Answer

What is ductility in steel ?

A
Ratio of ultimate stress to yield stress
B
Stress at yield stress
C
Amount of strain a material can withstand before fracture
D
Ratio of change in length to original length

Question 99Single Answer

If the gauge pressure of air in a cylinder is 250 kPa, then it's absolute pressure will be _______ .

A
50 kPa
B
150 kPa
C
350 kPa
D
450 kPa

Question 100Single Answer

Flow velocity at the throat of a converging-diverging nozzle is ______, when designed for maximum discharge .

A
Supersonic
B
Sonic
C
Sub-sonic
D
Hypersonic

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Latest JKPSC AE Mechanical Exam Question (Objective Questions), MCQ in English

Mechanical

JKPSC AE Mechanical Exam Online Question Bank Package

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