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Take this paper as a timed mock test. Review your answers after you submit.
Read the paper at your pace. Open an explanation when you need it.
While deaerating the steam, when water is heated to 100∘ C, another steam is introduced known as............... .
scorching steam
pegging steam
charging steam
monochrome steam
Correct answer
scorching steam
Identify the measuring set-up shown in the following figure.
Pitot tube
Diaphragm gauge
Bernoulli's tube
Switch gauge
Correct answer
Pitot tube
Identify the cycle on the basis of its P-h diagram.
Stirling cycle
Vapour compression refrigerant cycle
Brayton cycle
Mollier cycle
Correct answer
Stirling cycle
Assertion (A): While tensile testing of gold, necking phenomenon occurred.
Reason (R): Gold is a brittle material.
A is true but R is false
Both A and R are true
A is false but R is true
Both A and R are false
Correct answer
A is true but R is false
Thermo-siphon type of IC engine cooling system _________ .
does not use a pump for water circulation
uses a condenser for cooling
uses grease as working fluid
uses a compressor for water circulation
Correct answer
does not use a pump for water circulation
Identify Point A in the given figure.
Triple point
Saturation point
Critical point
Superheated point
Correct answer
Triple point
Identify the correct pair from the following.
Otto cycle → Petrol engines
Diesel engines → Electric vehicles
Carnot cycle → Compressors
Brayton cycle → Chillers
Correct answer
Otto cycle → Petrol engines
Which of the following statements related to the efficiency of a roots blower is correct?
It is a ratio of actual work done to ideal work done.
It is a ratio of actual volume to ideal volume required.
It is a ratio of ideal volume to actual volume required.
It is a ratio of isentropic work done to actual work done.
Correct answer
It is a ratio of actual work done to ideal work done.
Which of the following is NOT a safety valve used in a boiler?
Pin safety valve
Dead weight safety valve
Lever safety valve
Spring loaded safety valve
Correct answer
Pin safety valve
Match the columns.
A-2; B-3; C-1
A-2; B-1; C-3
A-1; B-3; C-2
A-3; B-1; C-2
Correct answer
A-2; B-3; C-1
Identify the correct pair from the following.
Secondary refrigerant → R12
Secondary refrigerant → R1150
Secondary refrigerant → Brine
Secondary refrigerant → R11
Correct answer
Secondary refrigerant → R12
Relative density is also termed as ______.
buoyancy
floatability
acceleration
specific gravity
Correct answer
buoyancy
Tensile forces on the arms of a flywheel are due to the ______.
kinetic forces
lateral deviation
longitudinal variation
centrifugal forces
Correct answer
kinetic forces
Which of the following statements is correct with respect to the Cochran boiler?
It has high rate of steam generation
It requires high floor area
High room head is required for its installation due to the vertical design
It has high initial installation cost
Correct answer
It has high rate of steam generation
Coefficient of performance for vapour compression refrigeration is _____ proportional to evaporator temperature and ______ proportional to condenser temperature.
inversely, inversely
directly, directly
directly, inversely
inversely, directly
Correct answer
inversely, inversely
Identify the correct pair in terms of type of process and the temperatures they are carried out from the following options.
Brazing → Below 300∘ C
Soldering → Above 1500∘ C
Brazing → Above 1500∘ C
Soldering → Below 300∘ C
Correct answer
Brazing → Below 300∘ C
Calculate the depth of the centre of pressure for the following body submerged in water.
h/4
h/3
h
h/2
Correct answer
h/4
Identify the correct option based on the following statements pertaining to steam.
A: At a given pressure, the capacity of superheated steam to do work will be comparatively higher.
B: Dryness fraction is a term related to quality of steam.
C: Wet steam does not exist.
Both A and B are true
Only C is true
Only A is true
Both A and C are true
Correct answer
Both A and B are true
Steam tables are available either on _____ or ______ basis.
temperature, velocity
pressure, dryness
pressure, temperature
velocity, dryness
Correct answer
temperature, velocity
Natural draught for exhaust gases is provided during the working of a steam generator by ________.
feed valves
chimneys
conductors
compressors
Correct answer
feed valves
Match the given stages of the valve timing diagram for four-stroke petrol engines with their respective positions.
| Column A (Stages) | Column B (Position) |
|---|---|
| A. Exhaust valve opens | 1. 10°-20° before top dead centre |
| B. Exhaust valve closes | 2. 30°-50° before bottom dead centre |
| C. Inlet valve opens | 3. 10°-15° after top dead centre |
A-3; B-1; C-2
A-2; B-3; C-1
A-2; B-1; C-3
A-1; B-3; C-2
Correct answer
A-3; B-1; C-2
Which of the following statements is correct with respect to definition of sensible heat factor?
It is a ratio of sensible heat to total heat of the system.
It is a ratio of total heat to usable heat of the system.
It is a ratio of total heat to sensible heat of the system.
It is a ratio of total heat to available heat of the system.
Correct answer
It is a ratio of sensible heat to total heat of the system.
Identify the correct expression from the following options.
Brake power = Indicated power + Friction power
Brake power = Indicated power / Friction power
Brake power = Indicated power * Friction power
Brake power = Indicated power - Friction power
Correct answer
Brake power = Indicated power + Friction power
________ is a vertical boiler.
Cochran boiler
Locomotive boiler
Babcock and Wilcox boiler
Lancashire boiler
Correct answer
Cochran boiler
________ is also known as the principle of transmission of fluid pressure.
Buoyancy law
Pascal's law
Newton's law
Archimedes' principle
Correct answer
Buoyancy law
Match the columns.
| Column A (Compressor) | Column B (Feature) |
|---|---|
| A. Screw compressor | 1. Compressor and motor operate on same shaft |
| B. Hermetically sealed compressor | 2. Uses piston assembly |
| C. Reciprocating compressor | 3. Rotary type |
A-3; B-1; C-2
A-2; B-3; C-1
A-2; B-1; C-3
A-1; B-3; C-2
Correct answer
A-3; B-1; C-2
Identify the part of the flywheel indicated as 'A' in the following figure.
Hub
Frame
Spoke
Rim
Correct answer
Hub
According to the Darcy-Weisbach equation for flow through pipe, head loss due to friction is inversely proportional to which of the following pipe parameters?
Diameter of the pipe
Material type of the pipe
Colour of the pipe
Weight of the pipe
Correct answer
Diameter of the pipe
Identify the correct statement with respect to centrifugal pumps.
Forward curved vanes can handle high flow rates.
Forward curved vanes have concave side of curvature facing direction of fluid flow.
In radial vanes, the fluid does not flow radially outward/inward from centre of rotation.
Backward curved vanes can handle high flow rates.
Correct answer
Forward curved vanes can handle high flow rates.
The temperature at which liquid droplets just appear when moist air is cooled continuously is called ______.
flash point temperature
fire temperature
pour point temperature
dew point temperature
Correct answer
flash point temperature
Statements:
A) SI engine does not consist of a spark plug.
B) CI engine does not consist of a spark plug.
Both statements are true
Statement B is true but Statement A is false
Both statements are false
Statement A is true but Statement B is false
Correct answer
Both statements are true
Match column A with column
| Column A (Boiler) | Column B (Pressure) |
|---|---|
| A. Cochran boiler | 1. Medium pressure |
| B. Babcock and Wilcox boiler | 2. Low pressure |
| C. Locomotive | 3. High pressure boilers |
A-2; B-3; C-1
A-1; B-2; C-3
A-2; B-1; C-3
A-1; B-3; C-2
Correct answer
A-2; B-3; C-1
Barometric pressure is also known as _______.
fluid pressure
volumetric pressure
atmospheric pressure
density
Correct answer
fluid pressure
Which of the following Statements is/are correct:
A) Mechanical efficiency of a single-cylinder four-stroke engine is the ratio of brake power to indicated power.
B) Volumetric efficiency of SI engine is generally less than 30%.
C) Volumetric efficiency of CI engine is generally less than 30%.
Only Statement C
Only Statement A
Only Statement B
Only Statements B and C
Correct answer
Only Statement C
Two types of radiators used for IC engine systems are _____ and _______ .
tubular core type, cellular core type
tubular core type, reciprocating core type
reciprocating core type, rotating core type
rotating core type, cellular core type
Correct answer
tubular core type, cellular core type
Which of the following efficiencies is NOT related to turbines?
Mechanical efficiency
Hydraulic efficiency
Machine efficiency
Volumetric efficiency
Correct answer
Mechanical efficiency
Assertion (A): Hot tea kept in a thermos flask remains hot for a longer duration.
Reason (R): A thermos flask is an example of a closed system.
Both A and R are true
A is false but R is true
Both A and R are false
A is true but R is false
Correct answer
Both A and R are true
Identify the INCORRECT statement from the following options.
Stainless steels are a type of alloy steels.
Stainless steel contains chromium.
Stainless steels are a type of non-ferrous steels.
Stainless steels are resistant to corrosion.
Correct answer
Stainless steels are a type of alloy steels.
Velocity potential function is a/an _______ .
infinite quantity
vector quantity
elemental quantity
scalar quantity
Correct answer
infinite quantity
Identify whether the given statements are true or false.
Statements:
A) In a double acting compressor, suction and expansion take place in two different strokes.
B) In single acting compressors, both suction and expansion stroke take place in two different strokes.
Both statements are false
Statement B is true but Statement A is false
Statement A is true but Statement B is false
Both statements are true
Correct answer
Both statements are false
Which of the following is NOT a minor energy (head) loss?
Loss due to enlargement
Loss due to obstruction in pipe
Loss due to friction
Loss due to contraction
Correct answer
Loss due to enlargement
The graphical representation of transformation of 1 kg of ice into 1 kg of superheated steam at constant pressure is known as □( ) .
u-v diagram
h-s diagram
p-v diagram
t-h diagram
Correct answer
u-v diagram
Loss of head occurring due to bend in pipe during fluid flow is considered as _______.
minor loss
resultant loss
recording loss
major loss
Correct answer
minor loss
Identify the correct statement with reference to definition of coefficient of discharge for a steam nozzle.
Ratio of actual discharge to theoretical discharge.
Ratio of total discharge to leaked discharge.
Ratio of theoretical discharge to total discharge.
Ratio of theoretical discharge to actual discharge.
Correct answer
Ratio of actual discharge to theoretical discharge.
The work of a compressor in a vapour compression refrigeration system is to _______.
increase the volume of the refrigerant at constant entropy
increase the temperature of the refrigerant at constant entropy
increase the pressure of the refrigerant at constant entropy
increase the velocity of the refrigerant at constant entropy
Correct answer
increase the volume of the refrigerant at constant entropy
Which of the following statements based on the given figure is/are correct?
Statements:
A) Point Y represents rupture strength.
B) Point E represents elastic limit.
C) Point P represents proportional limit.
Only Statements B and C
Only Statement A
Only Statement C
Only Statement B
Correct answer
Only Statements B and C
An oil of specific gravity 0.9 flows through a 0.1 m diameter pipe under a pressure of 100 kPa. The centre line of the pipe is 5 m above the datum line, and the total energy with respect to the datum is 0.04 kJ/N. Then the discharge of the oil through the pipe in litre per second is
170
340
85
677
Correct answer
170
In a rotameter, the float position indicates ______.
weight
viscosity
density
flow rate
Correct answer
weight
In case of liquids, _______ can be seen as cohesive forces between molecules of liquid.
adaptability
transferability
permeability
viscosity
Correct answer
adaptability
Identify point A in the following figure.
Critical point
Triple point
Saturation point
Superheated point
Correct answer
Critical point
Archimedes' principle discusses _______.
viscosity
illuminance
potency
buoyancy
Correct answer
viscosity
The value of static friction is between ______ and limiting friction.
10
0
15
5
Correct answer
10
In order to grind material with high tensile strength _____ abrasive is predominantly used on abrasive wheels.
aluminium oxide
sodium chloride
manganese
copper
Correct answer
aluminium oxide
Based on the following P-V and T-s diagrams, identify the IC engine cycle.
Brayton cycle
Diesel cycle
Otto cycle
Stirling cycle
Correct answer
Brayton cycle
Match column A with column B.
| Column A (Law of Thermodynamics) | Column B (Concept) |
|---|---|
| A. Zeroth law | 1. Conservation of energy |
| B. First law | 2. Entropy |
| C. Second law | 3. Thermal equilibrium |
A-2; B-1; C-3
A-1; B-3; C-2
A-3; B-1; C-2
A-2; B-3; C-1
Correct answer
A-2; B-1; C-3
A ______ is provided to remove the water from a steam-water mixture in a boiler.
lever valve
pin check
fusible plug
steam trap
Correct answer
lever valve
Calculate the depth of centre of pressure for the following body (circular plate) submerged in water (where D is diameter and G is centre of gravity).
D/2
D/3
5D/8
5D/4
Correct answer
D/2
Statements:
A) Work done by a system on its surroundings is treated as a negative quantity.
B) Energy transfer as heat to a system from its surroundings is treated as a positive quantity.
Both A and B are true
A is true but B is false
A is false but B is true
Both A and B are false
Correct answer
Both A and B are true
Which of the following is NOT a type of lathe machine?
Turret lathe
Tool room lathe
Boiler room lathe
Bench lathe
Correct answer
Turret lathe
Which of the following is a 100% reaction turbine?
Hero's turbine
Rateau turbine
Curtis turbine
De-Laval turbine
Correct answer
Hero's turbine
Given in the options are terminologies related to the valve timing diagram of an IC engine and their full forms. Identify the full form that is correctly paired with its short form.
FVO → First valve operation
TDC → Top dead centre
BDC → Burden dead core
IVC → Intake valve corrosion
Correct answer
FVO → First valve operation
In ______ compressors, the compressor and the motor work on the same shaft and are housed in the same casing.
hermetically sealed
common cased
ergonomically tabulated
hydrophobically crafted
Correct answer
hermetically sealed
Refer to the given figure which shows Power (P) versus Discharge (Q) for a centrifugal pump and match the columns accordingly.
| Column A (Curve) | Column B (Type of vane) |
|---|---|
| A. Curve B | 1. Forward vane |
| B. Curve A | 2. Backward vane |
| C. Curve C | 3. Radial vane |
A-2; B-3; C-1
A-1; B-2; C-3
A-1; B-3; C-2
A-3; B-1; C-2
Correct answer
A-2; B-3; C-1
Cochran boiler is a ______ and _____ type of boiler.
fire tube; vertical; low pressure
fire tube; horizontal; low pressure
water tube; horizontal; high pressure
water tube; vertical; high pressure
Correct answer
fire tube; vertical; low pressure
Which of the following fuels is LEAST/NEVER used in a boiler?
Gas
Mercury
Oil
Coal
Correct answer
Gas
Identify the correct option based on the following statements.
A: Refrigerant should be affected by moisture.
B: Refrigerants should be non-toxic.
C: Refrigerants should be non-corrosive.
Only B and C are true
Only A and C are true
All A, B and C are true
Both A and B are true
Correct answer
Only B and C are true
Bernoulli's equation is applied on ______.
tachometer
manometer
sine bar
orifice meter
Correct answer
tachometer
Match column A with column B.
| Column A (Property) | Column B (Definition) |
|---|---|
| A. Flash point | 1. Temperature at which vapours are given off from oil |
| B. Pour point | 2. Temperature at which lubricant is able to flow |
| C. Fire point | 3. Temperature at which oil catches fire |
A-1; B-2; C-3
A-2; B-3; C-1
A-2; B-1; C-3
A-3; B-1; C-2
Correct answer
A-1; B-2; C-3
Identify the correct statement with respect to hydroelectric power plant.
Net head is the water level before tail race.
Net head or effective head is the head available at the inlet of the turbine.
Gross head is the effective head after the water is delivered.
Gross head is the water level before head race.
Correct answer
Net head is the water level before tail race.
Identify the correct option based on the given statements. A: Clearance ratio for a single stage reciprocating compressor is the ratio of clearance volume to swept volume. B: Clearance ratio for single stage reciprocating compressor is generally in the range of 2 to 10%.
Both A and B are false
A is true, but B is false
Both A and B are true
A is false, but B is true
Correct answer
Both A and B are false
Coefficient of friction depends on ______ .
Density of the fluid
Surface roughness
Colour of the fluid
Weight of the fluid
Correct answer
Density of the fluid
In a glass tube with water flowing, a liquid dye with the same specific weight is introduced. The resulting dye filament pattern is observed as shown in the figure. Identify the type of flow from the following options.
Laminar flow
Recoil flow
Transient flow
Turbulent flow
Correct answer
Laminar flow
Identify the correct pair in terms of type of welding and the electrode used from the following options.
Tungsten electrode → TIG welding
Aluminium electrode → Laser welding
Monel electrode → Friction stir welding
Titanium electrode → Friction welding
Correct answer
Tungsten electrode → TIG welding
_______ is a part of gas turbine fuel injector.
Plug
Screw gauge
Gun
Vaporiser
Correct answer
Plug
Which of the following is NOT a type of cam when classified according to follower movement?
Dwell-Rise-Dwell-Return-Dwell
Rise-Rise-Rise
Rise-Return-Rise
Dwell-Rise-Return-Dwell
Correct answer
Dwell-Rise-Dwell-Return-Dwell
Identify the flow shown in the following figure.
Turbulent flow
Laminar flow
Recoil flow
Transient flow
Correct answer
Turbulent flow
Which of the following is NOT an assumption made for Euler's equation of motion?
Frictional losses are zero
Velocity of flow varies across the cross section
Fluid is non-viscous
Fluid is incompressible
Correct answer
Frictional losses are zero
Which of the following is NOT a component used in steam generation?
Evaporator
Governor
Boiler
Superheater
Correct answer
Evaporator
Which of the following is NOT a type of clutch?
Cone clutch
Dry clutch
Cycloid clutch
Plate clutch
Correct answer
Cone clutch
Which of the following options is NOT true about viscosity?
It is caused by friction within a fluid.
Its unit is N-s/m^2.
It is the same as specific gravity.
It is defined as the fluid's resistance to deformation at a given flow.
Correct answer
It is caused by friction within a fluid.
Which of the following is true for stage efficiency for the steam turbines?
It is the product of blade efficiency and nozzle efficiency.
It is the addition of blade efficiency and nozzle efficiency.
It is the ratio of blade efficiency to nozzle efficiency.
It is the square of blade efficiency.
Correct answer
It is the product of blade efficiency and nozzle efficiency.
For which of the instrument out of given below, the coefficient of discharge is minimum?
Venturimeter
Orifice meter
Pirani gauge
Nozzle meter
Correct answer
Venturimeter
Statements:
A: Condenser is a component of the refrigeration cycle.
B: Throttling device is not a component of the refrigeration cycle.
C: A compressor is a device of the refrigeration cycle.
Only B and C are true
Only A and C are true
Both A and B are true
All A, B and C are true
Correct answer
Only B and C are true
Negative gauge pressure is also known as _______.
barometric pressure
atmospheric pressure
vacuum pressure
mercury pressure
Correct answer
barometric pressure
Identify the correct statement with respect to air standard cycle assumptions.
Water is a working fluid.
All processes in power cycles are internally irreversible.
Air is considered an ideal gas.
Steam is supplied at lower temperatures.
Correct answer
Water is a working fluid.
_______ is done for keeping the steam turbine speed fairly same in-spite of load.
Positioning
Steering
Parting
Governing
Correct answer
Positioning
Which of the following is NOT a classification of orifices?
Free discharging orifices
Drowned orifices
Submerged orifices
Blocked orifices
Correct answer
Free discharging orifices
Identify the correct pair on basis of types of components.
Venturimeter → Volume fan
Casing → Volute casing
Motor → Friction blades
Piston → Forward flow
Correct answer
Venturimeter → Volume fan
An air preheater is essentially a/an ______.
heat exchanger
cooler
expander
chiller
Correct answer
heat exchanger
Identify the thermodynamic device shown here.
Refrigerator
Condenser
Compressor
Boiler
Correct answer
Refrigerator
Statements:
A) A refrigerant should have high boiling point.
B) A refrigerant should have high latent heat value.
C) A refrigerant should have low freezing point.
All A,B and C
Only A and C
Only B and C
Both A and B
Correct answer
All A,B and C
Which of the following is NOT a type of boiler on the basis of its position?
Prone position boiler
Horizontal boiler
Inclined boiler
Vertical boiler
Correct answer
Prone position boiler
The efficiency of Carnot cycle is expressed as ______.
ratio of work done to amount of heat given
ratio of volume compressed to amount of heat given
ratio of work supplied to amount of work done
ratio of work done to pressure released
Correct answer
ratio of work done to amount of heat given
In ______ water flows parallel to the axis of the rotation of shaft.
old Francis turbine
Francis turbine
Kaplan turbine
Pelton wheel
Correct answer
old Francis turbine
Calculate the depth of centre of pressure for the following body submerged in water.
(2h)/3
(4h)/3
h/3
(5h)/3
Correct answer
(2h)/3
Assertion (A): Steam turbines operate at fairly the same speed regardless of the load due to governing.
Reason (R): Throttle governing is often done in small steam turbines.
A is true but R is false
Both A and R are true
Both A and R are false
A is false but R is true
Correct answer
A is true but R is false
Which of the following turbines is correctly paired with its type?
Mixed flow turbine → Francis turbine
Radial flow turbine → Kaplan turbine
Reaction turbine → Pelton wheel turbine
Inward flow turbine → Fourneyron turbine
Correct answer
Mixed flow turbine → Francis turbine
Which of the following processes DOES NOT constitute in the Carnot cycle?
Reversible Isothermal Heat Addition
Reversible Adiabatic Expansion
Reversible Isobaric Condensation
Reversible Isothermal Heat Rejection
Correct answer
Reversible Isothermal Heat Addition
The SI unit of couple is:
Kg-S
N-S
Pa-m
N-m
Correct answer
Kg-S
Identify the pressure indicated by C in the following figure.
Vacuum pressure
Absolute pressure
Gauge pressure
Barometric pressure
Correct answer
Vacuum pressure
100 questions in the full paper