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 .
A
4
B
2
C
3
D
1
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
Question 101Single Answer
What happens when a fluid is at rest ?
A
There is no shear component
B
Internal deformation is considerable
C
Fluid element will not be subjected to normal and shear component
D
Frictional force is present
Question 102Single Answer
What is the unit of surface tension ?
A
kg/m
B
N/m
C
N-m
D
N
Question 103Single Answer
Which of the following does NOT result in poor performance of boilers ?
A
Surface fouling
B
Poor combustion
C
Boiler mounting
D
Poor water quality
Question 104Single Answer
In the context of fluid mechanics, which of the following statements is INCORRECT ?
A
Fluid continues in motion under the application of shear stress
B
Fluid does not deform continuously under shear stress
C
Fluid cannot sustain any shear stress when at rest
D
Fluid deforms under very small shear stress
Question 105Single Answer
A centrifugal pump :
A
flow is radially outwards in this pump
B
fluid gain is through constant head
C
flow is tangential in this pump
D
works on the same principle as that of a Francis turbine
Question 106Single Answer
A fusible plug must be used primarily for safety purposes in which of the following types of boilers ?
A
Oil-fired boiler
B
High – pressure boiler
C
Fire-tube boiler
D
Marine type boiler
Question 107Single Answer
The Rankine cycle is an ideal cycle for vapour power plants because :
A
it does not allow isentropic expansion
B
steam is not condensed in the condenser
C
it includes reversible processes
D
water enters the pump at unsaturated state
Question 108Single Answer
A continuity equation for two dimensional compressible flow is given by
A
B
C
D
Question 109Single Answer
A single stage impulse turbine is also known as :
A
Curtis stage turbine
B
reaction turbine
C
De Laval turbine
D
Rateau turbine
Question 110Single Answer
Which of the following statements is more relevant ?
A
In kinematics of fluid flow, pressure is a vector field
B
In the Largrangian approach, a fluid particle of fixed mass is considered
C
Fluid kinematics deals with the action of the forces in producing or changing motion of fluid
D
In the Eluerian method, control volume approach is not used
Question 111Single Answer
The refrigerant used in the VCR based refrigerant cycle rejects heat in .............
A
the expansion value
B
the evaporator
C
the condenser
D
the compressor
Question 112Single Answer
Select the most appropriate definition of a turbine from the following statement :
A
Turbine is a fluid machine
B
It is device in which kinetic energy held by a fluid is converted to mechanical energy of a rotating member
C
It is a device where potential energy is transferred to a fluid
D
It is a device where mechanical energy from moving parts is transferred to a fluid
Question 113Single Answer
In the context of aircraft refrigeration cycle, what is temperature of air at the exit of cooling turbine in the absence of moisture condensation ?
A
Saturated temperature
B
Dry air rated temperature (DART)
C
Super-saturated temperature
D
Dry air temperature (DAT)
Question 114Single Answer
Fans and blowers of turbo mechines :
A
a higher static pressure will prevail
B
spiral casing decreases the static pressure
C
deliver air at a higher desired velocity
D
deliver air at a lower mass flow rate
Question 115Single Answer
Which of the following characteristics of a centrifugal pump is vital ?
A
Slip will decrease with the increase in flow rater
B
Fluid is considered to have friction while flowing inside the pump
C
Fluid moves normal to the blade
D
There will be no whirl component of velocity at the entry to impeller
Question 116Single Answer
For a single cylinder four-stroke oil engine, indicated power is 15 kW, calorific value of fuel is 40000 kJ/kg and fuel consumed is 0.001 kg/s. What will be the indicated thermal efficiency ?
A
40%
B
37.5%
C
62.5%
D
75%
Question 117Single Answer
In air standard cycle analysis of IC engines, which of the following statements is correct ?
A
Specific heats (Cp, Cv) of air vary with temperature
B
There will be a sudden change in chemical equilibrium of the working fluid
C
There are not intake or exhaust processes
D
Compression and expansion processes are considered as irreversible
Question 118Single Answer
What is a dilatants ?
A
It is a fluid with suspended colour pigments
B
It is a shear thickening fluid
C
It is a fluid that sustains shear stress without any deformation
D
It is a shear thinning fluid
Question 119Single Answer
Boilers in the Rankine cycle are used :
A
to allow expansion of steam
B
to store working fluid
C
for steam generation
D
to maintain heat in the process
Question 120Single Answer
Normal volume generated by the working piston when travelling from one dead centre to the next is called ...........
A
clearance volume
B
swept volume
C
total volume
D
stroke volume
Question 121Single Answer
Which of the following is an inferential type of flow meter ?
A
Purge flow regulator
B
Rotameter
C
Laser doppler
D
magnetic flowmeter
Question 122Single Answer
Which of the following statements is correct with reference to perpentual motion machines of the first kind ?
A
it violatates the second law of thermodynamics
B
It is a reversible process
C
It produces heat without receiving work input
D
It produces work without receiving heat
Question 123Single Answer
With respect to head loss of flowing fluid, select the most appropriate statement :
A
Energy loss is not caused by change in velocity
B
Increase in velocity in a flow induces large scale turbulence
C
Energy los is not due to formation of eddies
D
Portion of energy loss will not be dissipated as heat
Question 124Single Answer
According to IBR regulations, boilers exceeding ......... need regular inspection and certification :
A
capacity of more than 15 litres
B
capacity of more than 5 gallons
C
capacity lesser than 5 gallons
D
capacity of more than 50 gallons
Question 125Single Answer
While loading ........... material undergoes fracture after large amount of deformation :
A
isotropic
B
plastic
C
brittle
D
ductile
Question 126Single Answer
Which of the following statement is relevant ?
A
Fluid deforms continuously under the action of shear stress of even veloy low magnitude
B
Fluid deforms under constant shear stress
C
Fluid can sustain shear stress when at rest
D
fluid does not deform continuously under the action of shear stress
Question 127Single Answer
The specific gravity of water at standard atmospheric conditions is :
A
greater than 1
B
less than Zero
C
1
D
Zero
Question 128Single Answer
Which of the following pair is NOT an example of a lower pair ?
A
Prismatic pair
B
Helical and cylindrical pair
C
revolute pair
D
Rollin ball on a flat surface
Question 129Single Answer
A thermoelectric refrigeration system requires :
A
low voltage DC input
B
high voltage Dc input
C
high voltage AC input
D
low voltage AC input
Question 130Single Answer
For a carburising flame, the flow of ............... is kept higher :
A
argon
B
nitrogen
C
oxygen
D
acetylene
Question 131Single Answer
At sea level, under normal conditions, what is the atmospheric pressure ?
A
101.32 kPa
B
100.043 kPa
C
100.1 kPa
D
104.13 kPa
Question 132Single Answer
The fourth stage of the compression ignition process is :
A
burning on the expansion stroke
B
ignition delay periodtion
C
period of controlled combustion
D
period of rapid of uncontrolled combus
Question 133Single Answer
Which of the following is the best example of a thixotropic fluid ?
A
Tooth paste
B
Minerals in suspension
C
Fly ash
D
Printing ink
Question 134Single Answer
One ton of refrigeration is equal to ............... kW .
A
5
B
2.5
C
3.5
D
1
Question 135Single Answer
lithium bromide is used as an absorbent in .........
A
vapour compression refrigeration
B
vapour absorption refrigeration
C
steam jet refrigeration
D
Electrolux refrigerators
Question 136Single Answer
A member of length 200 mm and diameter 25 mm is subjected to a tensile load of 20 kN. The final length of the member is found to be 220 mm. The percentage increase in the length of the member is :
A
2 %
B
1 %
C
5 %
D
10 %
Question 137Single Answer
An appurtenance whose length generally does NOT exceed three times of its diameter is called ........... .
A
a non-return valve
B
a diffuser
C
an orifice
D
a mouthpiece
Question 138Single Answer
Which refrigeration system is driven by low grade energy ?
A
Gas cycle refrigeration
B
Steam jet refrigeration
C
Vortex tube systems
D
Thermo-electric refrigeration
Question 139Single Answer
What is radiant heating in the context of boilers ?
A
Heating process carried out using radiation effect
B
Heating done on radial tubes
C
Saturated steam is re-circulated and superheated
D
Heating done on external walls only by reflecting radiant energy
Question 140Single Answer
When water is about to vapurise it is called ?
A
super-heated vapour
B
saturated vapour
C
sub-cooled liquid
D
sub-cooled liquid
Question 141Single Answer
Which is the most practical fluid for the Rankine cycle ?
A
Fuel
B
Air
C
Air-fuel mixture
D
Water
Question 142Single Answer
Heat and work both are :
A
point and path function
B
path functions
C
point functions
D
state functions
Question 143Single Answer
why do engines need to be cooled ?
A
To regulate mass transfer
B
To reduce ignition temperature
C
To avoid pre-ignition and knocking
D
To improve compression volume
Question 144Single Answer
............. is the ability of steel to resist stresses that are reversal in nature :
A
Impact strength
B
Fatigue strength
C
Toughness
D
Hardness
Question 145Single Answer
Which of the following is NOT a water-tube boiler ?
A
Stirling boiler
B
Cornish boiler
C
Loeffler boiler
D
LaMont boiler
Question 146Single Answer
Inter cooling in multistage compression reduces ...........
A
the work input to compressor
B
the volume of free air delivered
C
the pressure of air at delivery
D
the index of compression
Question 147Single Answer
With respect to reaction turbines, which of teh following statements is relevant ?
A
Guide
B
Water does not flow through a scroll casing
C
Governing of reaction turbines is done by altering position of the guide vanes
D
Flow rate cannot be controlled b changing the gate openings to the runner
Question 148Single Answer
Which of the following statements is INCORRECT with respect to water tube boilers ?
A
They are suitable for high steam pressure
B
They are suitable for large gas flows
C
They cannot handle high steam pressure
D
They are smaller and lesser in weight
Question 149Single Answer
Identify the complete and correct statement of the first law of thermodynamics :
A
During a process, extracting work without supplying heat, while sacrificing the energy of the system
B
Difference between the heat and work interactions during a pokes, which is property of the system
C
When a closed system executes a complete cycle, the sum of heat interactions is equal to the sum of work interactions
D
When a system undergoes a cycle, the integral of heat is equal to the integral of work
Question 150Single Answer
Which of the following is NOT a maintenance method of a boiler ?
