Mechanical engineering is the discipline that applies engineering, physics, and materials science principles to design, analyze, manufacture, and maintain mechanical systems. It is one of the oldest and broadest of the engineering disciplines. Mechanical Engineering is the branch of engineering concerned primarily with the industrial application of mechanics and with the production of tools, machinery, and their products.The mechanical engineering field requires an understanding of core areas including mechanics, dynamics, thermodynamics, materials science, structural analysis, and electricity. In addition to these core principles, mechanical engineers use tools such as computer-aided design , and product life cycle management to design and analyze manufacturing plants, industrial equipment and machinery, heating and cooling systems, transport systems, aircraft, watercraft, robotics, medical devices, weapons, and others. It is the branch of engineering that involves the design, production, and operation of machinery. Just follow the Mcqs online quiz being dispatched over here with respect to your preparation for entry admission test NTS PPSC OTS PTS and missllenous job exams simultaneously.
Here we have large collection of Mechanical Engineering Mcqs for all Students and jobs test preparation purpose. These Mechanical Engineering Mcqs will be updated on daily basis and added more multiple choice question about Mechanical Engineering frequently.You can prepare your Mechanical Engineering Subject for different classes like 9th class, 10th class ,11th class 12th class exams, Entry Test like MCAT NTS ,OTS ,PTS ,BTS, GTS, Jobs Test,Recruitment Test like PPSC CSS FPSC SPSC KPPSC and interviews here.
Mechanical Engineering Mcqs Online With Answers for NTS PPSC Entry Test Classes
In which circuits, relay of low voltage and low current is used to make open or close contact?
A. high voltage and high current circuit
B. low voltage and low current circuit
C. high voltage and low current circuit
D. low voltage and low current circuit
Right Answer: A. high voltage and high current circuit
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What are the dimensions of force?
A. [M L T – 2 ]
B. [M L T – 1 ]
C. [M L 2 T – 2 ]
D. [M L 2 T 2 ]
Right Answer: A. [M L T – 2 ]
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Which of the following protects penstock due to sudden variation of flow or velocity of water?
A. Anchors
B. Forebays
C. Trash rack
D. Surge Tank
Right Answer: D. Surge Tank
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Friction factor for laminar flow is given by?
A. (Re /64)
B. (64 / Re)
C. (Re / 16)
D. (16 / Re)
Right Answer: B. (64 / Re)
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At the maximum inversion temperature in the graph of isenthalpic or joule-kelvin expansion of a gas, the value of Joule-Kelvin coefficient is?
A. negative
B. positive
C. zero
D. positive, negative or zero depends upon initial temperature
Right Answer: C. zero
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A pilot tube is used for the measurement of?
A. Pressure
B. Velocity
C. Viscosity
D. Surface tension
E. Flow rate
Right Answer: Velocity
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Which energy is used to transmit power in hydrostatic system?
A. pressure energy
B. kinetic energy
C. potential energy
D. All of the abvove
Right Answer: A. pressure energy
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Which type of monitoring system uses stroboscope to measure speed of the machine?
A. Portable condition monitoring system
B. Basic condition monitoring system
C. Computer based condition monitoring system
D. None of the above
Right Answer: B. Basic condition monitoring system
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According to Joule’s law, the internal energy of a perfect gas is the function of absolute?
A. Density
B. Pressure
C. Temperature
D. Volume
Right Answer: C. Temperature
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When is the condensate flow almost always laminar?
A. when condensation occurs on a horizontal tube
B. when condensation occurs on a vertical bank of horizontal tubes
C. when condensation occurs on a vertical tube
D. when condensation occurs on a bunch of vertical tubes
Right Answer: A. when condensation occurs on a horizontal tube
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What is the entropy of the system at equilibrium state?
A. Zero
B. Minimum
C. Maximum
D. constant but not maximum
Right Answer: C. Maximum
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Which of the following instruments is used to measure base pitch of a gear in base tangent method?
A. Gear tooth vernier caliper
B. David Brown tangent caliper
C. David Brown tangent comparator
D. David Brown tangent micrometer
Right Answer: B. David Brown tangent comparator
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Which acceleration has a nonzero value in uniform flow?
A. Local acceleration
B. Convective acceleration
C. Both local as well as convective acceleration
D. unpredictable
Right Answer: A. Local acceleration
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In a steady, ideal flow of an incompressible fluid, total energy at any point of the fluid is always constant. This theorem is known as?
A. Euler’s theorem
B. Navier-stockes theorem
C. Reynold’s theorem
D. Bernoulli’s theorem
Right Answer: D. Bernoulli’s theorem
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The feedwater heater in which the extracted steam and feedwater are allowed to mix and both leave the heater at the same temperature, is called as?
A. open type feedwater heater
B. contact type feedwater heater
C. both a and b
D. none of the above
Right Answer: both a and b
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The process of bevelling sharp ends of a workpiece is called as?
A. knurling
B. grooving
C. facing
D. chamfering
Right Answer: D. chamfering
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Determine velocity of sound in air at 50o.
A. 1002.5 m/s
B. 360.45 m/s
C. 350 m/s
D. None of the above
Right Answer: B. 360.45 m/s
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If a relief valve has reliability of 0.989, how many failures are expected in testing 1000 such relief valves?
A. 111
B. 100
C. 10
D. 11
Right Answer: D. 11
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Which of the following is a property of bulk load?
A. Hardness
B. Cake forming tendency
C. Suspension part
D. Weight
Right Answer: B. Cake forming tendency
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When the thickness of an insulation is greater than the critical thickness of insulation, then the heat transfer rate of insulated pipe?
A. will be more than the heat transfer rate from the same pipe without insulation
B. will be less than the heat transfer rate from the same pipe without insulation
C. will become equal to the heat transfer rate from the same pipe without insulation
D. none of the above
Right Answer: B. will be less than the heat transfer rate from the same pipe without insulation
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The volute pumps and vortex volute pumps are __________ pumps with _________ shaft.
A. multistage, horizontal
B. multistage, vertical
C. single stage, horizontal
D. single stage, vertical
Right Answer: C. single stage, horizontal
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What is the critical thickness of insulation for hollow cylinder?
A. a thickness of insulation at which heat transfer rate from cylinder is minimum
B. a thickness of insulation at which heat transfer rate from cylinder is maximum
C. a thickness of insulation at which heat transfer from cylinder does not change with change in outside temperature
D. none of the above
Right Answer: B. a thickness of insulation at which heat transfer rate from cylinder is maximum
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What is an ideal fluid?
A. A fluid which has no viscosity
B. A fluid which is incompressible
C. A fluid which has no surface tension
D. All of the above
Right Answer: D. All of the above
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Discharge capacity of the reciprocating pump is __________ that of the centrifugal pump.
A. higher than
B. lower than
C. same as
D. unpredictable
Right Answer: B. lower than
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1 N/m2 pressure is equivalent to?
A. 1 pascal
B. 10-5 bar
C. 10-2 kg/m sec2
D. 7.5 x 10-3 mm Hg
E. Any of the above
Right Answer: Any of the above
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The ratio of actual whirl velocity to the ideal whirl velocity in the centrifugal compressor is called as?
A. velocity factor
B. slip factor
C. work factor
D. None of the above
Right Answer: B. slip factor
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What is the effect of increasing flow coefficient (Φ) in an axial flow compressor on blade loading coefficient (Ψ)?
A. Blade loading coefficient (Ψ) increases
B. Blade loading coefficient (Ψ) decreases
C. Blade loading coefficient (Ψ) remains constant
D. Unpredictable
Right Answer: B. Blade loading coefficient (Ψ) decreases
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What is the function of cone pulley drive in lathe machines?
A. Drive the lead screw
B. Change the spindle speed
C. Drive the tail-stock
D. All of the above
Right Answer: B. Change the spindle speed
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The surface of the single point cutting tool on which the chips formed in cutting operation slide is called as?
A. flank
B. heel
C. face
D. shank
Right Answer: C. face
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Which pump is more suitable for an application where very high pressure is required to be developed at moderate discharge?
A. Reciprocating pump
B. Centrifugal pump
C. Turbine
D. None of the above
Right Answer: A. Reciprocating pump
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According to Archimede’s principle, if a body is immersed partially or fully in a fluid then the buoyancy force is _______ the weight of fluid displaced by the body.
A. equal to
B. less than
C. more than
D. unpredictable
Right Answer: A. equal to
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Which among the following engines is NOT the type of aircraft gas turbine which works on jet propulsion cycle?
A. turbojet
B. turbofan
C. turboprop
D. none of the above
Right Answer: D. none of the above
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If viscosity of fluid is more, the thickness of boundary layer is?
A. More
B. Less
C. Not affected by change in viscosity
D. Unpredictable
Right Answer: A. More
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Which of the following vibrometers have frequency ratio (ω/ωn) << 1?
A. Accelerometers
B. Velometers
C. Both a and b
D. None of the above
Right Answer: A. Accelerometers
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The normal stress is the same in all directions at a point in fluid?
A. Regardless of the motion of one fluid layer relative to an adjacent layer
B. When there is no motion of one fluid layer relative to an adjacent layer
C. Only when the fluid is frictionless
D. Only when fluid is frictionless and incompressible
E. Only when the fluid has zero viscosity and is at rest
Right Answer: When there is no motion of one fluid layer relative to an adjacent layer
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The foundation of the centre lathe is called as?
A. carriage
B. tray
C. base
D. bed
Right Answer: D. bed
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A simple pitot tube is used to measure?
A. The pressure in a static fluid
B. The velocity in a flowing stream
C. The total pressure
D. The dynamic pressure
E. The undistributed fluid pressure
Right Answer: The velocity in a flowing stream
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Determine logarithmic decrement, if the amplitude of a vibrating body reduces to 1/6th in two cycles.
A. 0.223
B. 0.8958
C. 0.3890
D. None of the above
Right Answer: B. 0.8958
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The amount of heat transferred to convert unit mass of solid to vapour or vice versa is called as?
A. latent heat of vaporization
B. latent heat of fusion
C. latent heat of sublimation
D. specific heat
Right Answer: C. latent heat of sublimation
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Which property of the fluid offers resistance to deformation under the action of shear force?
A. density
B. viscosity
C. permeability
D. specific gravity
Right Answer: B. viscosity
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The critical depth on a channel is given by?
A. h = v2/g
B. h = v2/2g
C. h = v/2g
D. h = 2v/g
E. h = v/g
Right Answer: h = v2/g
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Which type of key consists of two square tapered keys placed 90o apart?
A. Tangent key
B. Kennedy key
C. Saddle key
D. Woodruff key
Right Answer: B. Kennedy key
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Select the statement which is correct?
A. Standard atmospheric pressure is 1 kg/cm2
B. A barometer reads the difference between load and standard atmospheric pressure
C. Standard atmospheric pressure is the mean local atmospheric pressure at sea level
D. Local atmospheric pressure is always below standard atmospheric pressure
E. Local atmospheric pressure depends upon the elevation of the locality only
Right Answer: Standard atmospheric pressure is the mean local atmospheric pressure at sea level
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The compressor in the vapour compression system is replaced by?
A. an absorber
B. a generator
C. an absorber-generator
D. none of the above
Right Answer: C. an absorber-generator
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Strain energy stored in a uniform bar is given as?
A. (σ E/ 2A)
B. (σ L/ 2AE)
C. (σ2 AL/ 4E)
D. (σ2 AL/ 2E)
Right Answer: D. (σ2 AL/ 2E)
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An object having 20 kg mass weighs 19.60 kg on a spring type balance. The value of ‘g’ in m/sec2 for the place is?
A. 1000
B. 9.8
C. 9.9
D. 10.2
E. 10.1
Right Answer: 9.9
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Which design consideration deals with appearance of the product?
A. Ergonomics
B. Aesthetics
C. System design
D. Creative design
Right Answer: B. Aesthetics
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Which cycle is more suitable for the reciprocating engines?
A. Brayton cycle
B. Rankine cycle
C. Otto cycle
D. All of the above are similarly efficient for same capacity
Right Answer: C. Otto cycle
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An ideal fluid is?
A. Similar to a perfect gas
B. Frictionless and incompressible
C. One which obeys Newton’s law of viscosity
D. One which satisfies continuity equation
E. One which flows through pipes with least friction
Right Answer: Frictionless and incompressible
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Beam engine mechanism is an example of?
A. double crank mechanism
B. double lever mechanism
C. crank and lever mechanism
D. none of the above
Right Answer: C. crank and lever mechanism
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Micro-controllers are ________________ than the PLCs.
A. bulky and expensive
B. bulky but cheaper
C. portable and cheaper
D. portable but expensive
Right Answer: C. portable and cheaper
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The radiation pyrometers work on the principle of?
A. Newton’s law
B. Stefan Boltzmann’s law
C. Zeroth law
D. None of the above
Right Answer: B. Stefan Boltzmann’s law
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Which of the following factors increases hardenability of a metal?
A. Alloying elements
B. Fine grain size
C. Very high carbon content in steel
D. All of the above
Right Answer: A. Alloying elements
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2
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The ratio of actual mass flow rate (ṁa) to ideal mass flow rate (ṁi) is called as?
A. nozzle coefficient
B. coefficient of nozzle friction
C. coefficient of discharge
D. coefficient of mass
Right Answer: C. coefficient of discharge
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Square root of the ratio of inertia force to elastic force is called as?
A. Mach’s Number
B. Cauchy’s Number
C. Both a and b
D. None of the above
Right Answer: C. Both a and b
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The layer above the laminar sublayer with some turbulence and still having importance of viscous action is called as?
A. sub-sublayer
B. turbulent layer
C. buffer layer
D. none of the above
Right Answer: C. buffer layer
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Which component of fluid velocity is responsible for transmission of power through rotodynamic machine?
A. Radial
B. Axial
C. Tangential
D. None of the above
Right Answer: D. Tangential
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The gates of aerofoil section in between the outer and inner ring of guide wheel are called as?
A. guide gates
B. guide vanes
C. scrolling gates
D. scrolling vanes
Right Answer: B. guide vanes
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The function of _________ is to convert high kinetic energy of gases into pressure energy.
A. impeller
B. diffuser
C. casing
D. None of the above
Right Answer: B. diffuser
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Which of the following is α – β brass?
A. Admiralty brass
B. Brazing brass
C. Cartridge brass
D. All of the above
Right Answer: B. Brazing brass
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Which of the following components are inspected by a Tool maker’s microscope?
A. gauges
B. screw threads
C. dies and fixtures
D. all of the above
Right Answer: D. all of the above
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What is the purpose of using a gear box?
A. To increase torque
B. To increase speed
C. Converts single input speed into multiple output speeds
D. All of the above
Right Answer: D. All of the above
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If a barometer carries wter instead of mercury, the height of column for a pressure equivalent to 75 cm of mercury will be?
A. 1020 cm
B. 1000 cm
C. 1034 cm
D. 1040 cm
E. 1050 cm
Right Answer: 1020 cm
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A mercury water manometer indicates a gauge difference of 400 mm. The difference in pressure, measured in metres of water, is?
A. 0.4
B. 0.8
C. 1088
D. 5.44
E. None of the above
Right Answer: 5.44
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In which power transmitting drive polygon effect is observed?
A. Belt drive
B. Chain drive
C. Both a and b
D. None of these
Right Answer: B. Chain drive
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Which of the following is/are example/s of direct contact type heat exchanger?
A. jet condenser
B. desuperheater
C. cooling tower
D. all of the above
Right Answer: D. all of the above
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The resonant frequency of a mass-spring system depends upon?
A. stiffness
B. surface density
C. depth of air space
D. all of the above
Right Answer: D. all of the above
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What does the boring mean?
A. a process of making a hole in an object
B. a process of enlarging a hole which is already in an object
C. a process of finishing an existing hole very smoothly and accurately in size
D. None of the above
Right Answer: B. a process of enlarging a hole which is already in an object
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Which type of earplugs contain silicon rubber and a fixing agent?
A. Semi insert protectors
B. Custom moulded earplugs
C. Pre-fabricated earplugs
D. Canal caps
Right Answer: B. Custom moulded earplugs
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Total amount of energy in the universe is?
A. Increasing
B. Decreasing
C. Constant
D. None of the above
Right Answer: C. Constant
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What is the ratio of maximum velocity to average velocity, when the fluid is passing through two parallel plates and flow is laminar?
A. 3/2
B. 2/3
C. 4/3
D. 3/4
Right Answer: D. 3/4
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The horizontal component of force on a curved surface is equal to the?
A. Weight of liquid vertically above the curved surface
B. Weight of liquid retained by the curved surface
C. Product of pressure at its centroid and area
D. Force on a projection of the curved surface into a vertical plane
E. Scalar sum of all elemented horizontal components
Right Answer: Force on a projection of the curved surface into a vertical plane
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The depth of oil having specific gravity 0.6 to produce a pressure of 3.6 kg/cm2 will be?
A. 40 m of oil
B. 36 m of oil
C. 50 m of oil
D. 60 m of oil
E. 120 m of oil
Right Answer: 60 m of oil
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Which body transmits force with negligible deformation?
A. Elastic body
B. Resistant body
C. Deforming body
D. All of the above
Right Answer: B. Resistant body
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An isobaric process, has constant?
A. Density
B. Pressure
C. Temperature
D. Volume
Right Answer: B. Pressure
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1 mm Hg pressure is equivalent to?
A. 1.333 x 102 N/m2
B. 1.333 x 10-3 bar
C. 1.3158 x 10-3 atm
D. 1.332 x 102 kg/m-sec2
E. Any of the above
Right Answer: Any of the above
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Deformation per unit length is called as?
A. Strain
B. Stress
C. Modulus of elasticity
D. None of the above
Right Answer: A. Strain
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What is the pH value of water permissible for boiler?
A. 0
B. 7
C. slightly less than 7
D. slightly more than 7
Right Answer: D. slightly more than 7
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The noise level generated by domestic air conditioner ranges between?
A. 38 dB to 70 dB
B. 35 dB to 52 dB
C. 62 dB to 88 dB
D. 50 dB to 60 dB
Right Answer: D. 50 dB to 60 dB
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What is the advantage of multiple piston pump?
A. multiple piston pump do not have pulsating flow
B. multiple piston pump have pulsating flow which is required
C. Both a and b
D. None of these
Right Answer: A. multiple piston pump do not have pulsating flow
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The sum of partial volumes of all gases in a mixture is equal to?
A. less than the total volume of the mixture
B. the total volume of the mixture
C. more than the total volume of the mixture
D. cannot predict
Right Answer: B. the total volume of the mixture
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The horizontal line in psychrometric chart joining the change of state of air represents?
A. humidification
B. sensible cooling or heating
C. sensible cooling or heating with humidification
D. sensible cooling or heating with dehumidification
Right Answer: B. sensible cooling or heating
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Absolute pressure is measured as?
A. Gauge pressure – Atmospheric pressure
B. Gauge pressure + Atmospheric pressure
C. Gauge pressure / Atmospheric pressure
D. none of the above
Right Answer: B. Gauge pressure + Atmospheric pressure
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What is the Wahl’s factor if spring index is 6?
A. 1.477
B. 0.995
C. 1.252
D. None of the above
Right Answer: C. 1.252
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Cylindrical roller bearings have greater?
A. axial load carrying capacity
B. thrust load carrying capacity
C. radial load carrying capacity
D. All of the above
Right Answer: C. radial load carrying capacity
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Which of the following errors are also known as cumulative errors?
A. Random errors
B. Systematic errors
C. Gross errors
D. System interaction errors
Right Answer: B. Systematic errors
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Which of the following is a machine shaft?
A. Line shaft
B. Counter shaft
C. Crankshaft
D. All of the above
Right Answer: C. Crankshaft
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The rotation of gears in internal gear pump takes place in?
A. same direction
B. different direction
C. Both a and b
D. None of these
Right Answer: A. same direction
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Which of the following assumptions are made in torsion theory?
A. Shaft is perfectly straight
B. Material of the shaft is heterogeneous
C. Twist cannot be uniform along the length of the shaft
D. All of the above
Right Answer: A. Shaft is perfectly straight
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Energy is not conserved but destroyed in the process. What is the reason behind this?
A. reversibility
B. irreversibility
C. both reversibility and irreversibility
D. none of the above
Right Answer: B. irreversibility
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Which of the following processes is used for surface finishing?
A. Shaping
B. Broaching
C. Lapping
D. All of the above
Right Answer: C. Lapping
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Which of the following activities or operations is not related to manufacturing?
A. Product design and development
B. Inventory control
C. Quality assurance
D. None of the above
Right Answer: D. None of the above
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Which of the following quantities has the dimensions [M0 L0 T 0]?
A. Density
B. Starin
C. Stress
D. Strain Rate
Right Answer: B. Strain
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0
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The rate of radiant flux between two black bodies is analogous to?
A. resistance in electrical system
B. voltage in electrical system
C. current in electrical system
D. none of the above
Right Answer: C. current in electrical system
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The radiation heat exchange between two bodies depends upon?
A. the views of two surfaces with each other
B. the medium between the two bodies
C. emitting and absorbing characteristics of the bodies
D. all of the above
Right Answer: D. all of the above
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The buoyancy forces which give rise to the natural convection are called as?
A. convection forces
B. fluid forces
C. body forces
D. none of the above
Right Answer: C. body forces
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What is runaway speed of the runner of Pelton wheel?
A. maximum unsafe speed of the runner due to sudden increase in load on turbine
B. minimum safe speed of the runner due to sudden increase in load on turbine
C. maximum unsafe speed of the runner due to sudden decrease in load on turbine
D. minimum safe speed of the runner due to sudden decrease in load on turbine
Right Answer: C. maximum unsafe speed of the runner due to sudden decrease in load on turbine
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The device which place the workpiece in the same position, in jig and fixture, cycle after cycle is called as?
A. placing device
B. fixing device
C. locating device
D. positioning device
Right Answer: C. locating device
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0
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Which quality management program is related to the maintenance of plants and equipments?
A. Environmental management systems
B. Fault tree analysis
C. Failure mode effect analysis
D. Total productive maintenance
Right Answer: D. Total productive maintenance
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The body whose surface does not coincide with the streamline when places in a flow is called as?
A. streamline body
B. wave body
C. bluff body
D. induced body
Right Answer: C. bluff body
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