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 natural convection, the Nusselt number (Nu) depends on?
A. Pr and Re
B. Gr and Re
C. Gr and Pr
D. none of the above
Right Answer: C. Gr and Pr
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The dynamic viscosity of most of the gases with rise in gas temperature?
A. Increases
B. Increases as ?T
C. Increses inversely as ?T
D. Decreases
E. Does not change significantly
Right Answer: Increases
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The maximum tangential stress σt = (σx sin 2θ)/2 is maximum if, θ is equal to?
A. 45o
B. 90o
C. 270o
D. All of the above
Right Answer: A. 45o
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Mechanical working processes are performed on metals?
A. to achieve optimum mechanical properties in the metal
B. to improve the mechanical strength of the metal
C. to make metal dense
D. all of the above
Right Answer: D. all 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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In an isolated system, ________ can be transferred between the system and its surrounding.
A. Only enrgy
B. Only mass
C. Both energy and mass
D. Neither energy and mass
Right Answer: D. Neither energy and mass
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Low-torque high-speed motors are used in?
A. cranes
B. fans
C. winches
D. all of the above
Right Answer: B. fans
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Which of the following condition is correct for natural convection?
A. (Gr / Re2) = 1
B. (Gr / Re2) << 1
C. (Gr / Re2) >> 1
D. none of the above
Right Answer: C. (Gr / Re2) >> 1
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Which casting process has no size and shape limits?
A. Sand casting
B. Shell-mould casting
C. Plaster-mould casting
D. none of the above
Right Answer: A. Sand casting
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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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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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Pressure drop in pipes, occurs due to?
A. frictional resistance
B. load
C. flow pattern
D. none of the above
Right Answer: A. frictional resistance
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A perfect gas?
A. Has zero viscosity
B. Has constant viscosity
C. Satisfies the relation PV = mRT
D. Is incompressible
E. None of the above
Right Answer: Satisfies the relation PV = mRT
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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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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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Casting replica used to make the cavity is called as?
A. Mould
B. Pattern
C. Cope
D. None of the above
Right Answer: B. Pattern
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The pressure in millimetres of mercury gauge, equivalent to 68 mm H2O plus 54.4 mm manometer fluid, sp. Gr. 2.5 is?
A. 10
B. 12.5
C. 15.5
D. 17.5
E. 20
Right Answer: 15.5
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A barometer is used to measure?
A. Very low pressures
B. Very high pressures
C. Pressure differeuce between two points
D. Pressure of fluid in a pipe line
E. Atmospheric pressure
Right Answer: Atmospheric pressure
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Which of the following is a type of low-torque high-speed motor?
A. radial piston motors
B. axial piston motors
C. bent axis motor
D. gear motor
Right Answer: D. gear motor
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Which of the following centrifugal pumps has higher specific speed than the others?
A. Axial flow
B. Radial flow
C. Mixed flow
D. All have same specific speed
Right Answer: A. Axial flow
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Which material cannot be used to manufacture shafts?
A. Plain carbon steels
B. Cast iron
C. Both a and b
D. None of the above
Right Answer: B. Cast iron
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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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For designing ductile materials, which of the following theories is/are used?
A. Maximum shear stress theory
B. Shear strain energy theory
C. Both a and b
D. None of the above
Right Answer: C. Both a and b
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When a venturimeter is used in an inclined position, it will show?
A. Sale reading
B. More reading
C. Less reading
D. Depends on vescosity of fluid
E. None of the above
Right Answer:Sale reading
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A fluid is a substance that?
A. Always expands until it fills any container
B. Has the same shear stress at a point regardless of its motion
C. Cannot remain at rest under action of any sher force
D. Cannot be subjected to shear forces
E. Is practically incompressible
Right Answer: Has the same shear stress at a point regardless of its motion
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The quality of vapour at the exit of nozzle ___________ due to nozzle friction.
A. increases
B. decreases
C. does not change
D. unpredictable
Right Answer: A. increases
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In an isothermal atmosphere?
A. Pressure decreases linearly with elevation
B. Pressure is constant all over
C. Pressure varies in the same way as density
D. Pressure increases directly as the square of height
E. Pressure varies exponentially with density
Right Answer: Pressure varies in the same way as density
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Which of the following is tested for parallelism between trajectory and a plane?
A. plane is on a component which moves
B. plane is on a component which does not moves
C. Both a and b
D. None of the above
Right Answer: C. Both a and b
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The thickness of layer material removed in one pass of workpiece under the cutter is called as?
A. single pass cut
B. depth of cut
C. width of cut
D. face cut
Right Answer: B. depth of cut
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The ability of the moulding sand to withstand the heat of melt without showing any sign of softening is called as?
A. strength or cohesiveness
B. refractiveness
C. collapsibility
D. adhesiveness
Right Answer: B. refractiveness
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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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In roller bearings which type of rolling elements are used?
A. Cylindrical rollers
B. Taper rollers
C. Spherical rollers
D. All of the above
Right Answer: D. All of the above
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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 the entropy change when the system is at stable equilibrium state?
A. the entropy change will be positive
B. the entropy change will be negative
C. the entropy change will be zero
D. cannot say
Right Answer: C. the entropy change will be zero
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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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PMM2 is the machine which violates?
A. Kelvin-Planck statement
B. Clausius statement
C. Both a and b
D. None of the above
Right Answer: C. Both a and b
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The upper critical Reynolds number is?
A. Important from a design view point
B. The number at which turbulent flow changes to laminar flow
C. About 2000 D. Not more than 2000
E. Of no practical importance in pipe flow problems
Right Answer: About 2000 D. Not more than 2000
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The Reynolds number for pipe flow is given by?
A. VD/v
B. VD
C. VD ? /
D. VD /
E. None of the above
Right Answer: VD ? /
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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 systems generate more energy when used in industrial applications?
A. hydraulic systems
B. pneumatic systems
C. both systems generate same energy
D. cannot say
Right Answer: A. hydraulic systems
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A liquid compressed in a cylinder has a volume of 1 litre at 1 MN/m2 and a volume of 995 cu-cm at 2 MN / m2. The bulk modulus of elasticity would be?
A. 200 Mpa
B. Mpa
C. 5 Mpa
D. 10 Mpa
E. 20 Mpa
Right Answer: 200 Mpa
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Line joining Syt (yield strength of the material) on mean stress axis and Se (endurance limit of the component) on stress amplitude axis is called as?
A. Goodman line
B. Soderberg line
C. Gerber line
D. None of the above
Right Answer: B. Soderberg line
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Which of the following materials is/are used to make an angle gauge block?
A. Hardening tool steel
B. Nickel
C. Tungsten carbide
D. All of the above
Right Answer: D. All of the above
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Which among the following is not considered when reference standards are used in the field of mechanical vibration and shock, monitoring and analysis of machines?
A. Terminology
B. Method of setting
C. Methods of measurement
D. None of the above
Right Answer: D. None of the above
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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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Which fixtures are used for machining parts which must have machined details evenly spaced?
A. Profile fixtures
B. Duplex fixtures
C. Indexing fixtures
D. None of the above
Right Answer: C. Indexing fixtures
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Which of the following ergonomic factors are encountered in engineering applications?
A. Thermal radiations
B. Lubrication failure
C. Fatigue
D. Corrosion
Right Answer: C. Fatigue
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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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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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In design process, which step is followed after defining the problem?
A. Analysis
B. Synthesis
C. Optimization
D. Evaluation
Right Answer: B. Synthesis
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What is the formula for thermal capacitance?
A. (Change in heat stored) / (Change in heat transfer rate)
B. (Change in heat stored) / (Change in thermal resistance)
C. (Change in heat stored) / (Change in temperature)
D. Unpredictable
Right Answer: C. (Change in heat stored) / (Change in temperature)
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Select the quantity in the following that is not a dimensionless parameter?
A. Pressure coefficient
B. Froude number
C. Darcy weisbach friction factor
D. Kinematic viscosity
E. Weber number
Right Answer: Kinematic viscosity
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The velocity of a fluid particle at the centre of the pipe section is?
A. Maximum
B. Minimum
C. Average
D. r.m.s.
E. Logarithmic average.
Right Answer: Maximum
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The sum of components of shear forces in the direction of flow of fluid is called as?
A. shear drag
B. friction drag
C. skin drag
D. all of the above
Right Answer: D. all of the above
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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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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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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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What is the ratio of isentropic work to Euler work in an centrifugal compressor called?
A. Work coefficient
B. Velocity coefficient
C. Pressure coefficient
D. Flow coefficient
Right Answer: C. Pressure coefficient
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Which of the following vibrations are classified according to magnitude of actuating force?
A. Torsional vibrations
B. Deterministic vibrations
C. Transverse vibrations
D. All of the above
Right Answer: B. Deterministic vibrations
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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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Ratio of two spindle speeds is constant in _________ progression.
A. Arithmetic
B. Geometric
C. Harmonic
D. None of the above
Right Answer: B. Geometric
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Which of the following is NOT a type of positive displacement pumps?
A. Reciprocating pump
B. Rotary displacement pump
C. Centrifugal pump
D. None of the above
Right Answer: C. Centrifugal pump
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What is the correct formula for absolute pressure?
A. Pabs = Patm – Pgauge
B. Pabs = Pvacuum – Patm
C. Pabs = Pvacuum + Patm
D. Pabs = Patm+ Pgauge
Right Answer: D. Pabs = Patm+ Pgauge
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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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Cam ring of unbalanced vane pump is?
A. Round
B. Elliptical
C. Both a and b
D. None of these
Right Answer: A. Round
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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 method is used for stability analysis?
A. Nyquisit criteria
B. Root locus method
C. Routh Hurwitz criteria
D. All of the above
Right Answer: D. All of the above
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Which of the following materials is/are used for Electrical Discharge Machining (EDM) process?
A. Brass
B. Copper
C. Graphite
D. All of the above
Right Answer: D. All of the above
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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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What is the ratio of amplitude of response to that of the input called?
A. Response
B. Gain
C. Phase
D. Frequency
Right Answer: B. Gain
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Which of the following is not a part of carriage of the centre lathe?
A. Tool post
B. Apron
C. Compound rest
D. Gear box controls
Right Answer: D. Gear box controls
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When two vapor cycles are coupled in series and heat rejected by one is absorbed by another, the cycle is called as?
A. Dual vapour cycle
B. Binary vapour cycle
C. Coupled vapour cycle
D. none of the above
Right Answer: B. Binary vapour cycle
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The density of air at 10?C and 1 Mpa abs in SI units is?
A. 12.31
B. 1.231
C. 118.4
D. 65
E. None of the above
Right Answer: 12.31
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Which of the following energy conversion devices convert heat into work?
A. Electrical generators
B. I. C engines
C. Condensers
D. All of these
Right Answer: B. I. C engines
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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 units of kinematic viscosity are?
A. kg/m2-sec
B. kg sec/m2
C. m/kg sec
D. m2/sec
E. m kg/sec.
Right Answer: m2/sec
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The hydrostatic law states that rate of increase of pressure in a vertical direction is equal to?
A. Density of the fluid
B. Specific weight of the fluid
C. Weight of the fluid
D. None of the above
Right Answer: Specific weight of the fluid
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Alcohol is used in manometers because?
A. It provides a suitable meniscus for the inclined tube
B. Its density being less can provide longer length for a pressure difference, thus more accuracy can be obtained
C. (A) and (B) above
D. Cheap and easily availale
E. Its vapour pressure is low
Right Answer: (A) and (B) above
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What is the reason for using unconventional or advanced machining processes?
A. Complex surfaces
B. High accuracy and surface finish
C. High strength alloys
D. All of the above
Right Answer: D. All of the above
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The thermometric property in the Kelvin scale is?
A. Temperature (T)
B. Work energy (W)
C. Heat energy (Q)
D. all of the above
Right Answer: C. Heat energy (Q)
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What causes infant mortality in mechanical equipments?
A. Design errors
B. Manufacturing defects
C. Installation defects
D. All of the above
Right Answer: D. All of the above
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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 method gives accurate results when effective diameter is measured without considering the thread angle?
A. Two wire method
B. Three wire method
C. Best wire size
D. All the above
Right Answer: C. Best wire size
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Torsional pendulum is used to determine mass moment of inertia of?
A. Fly wheel
B. Riding bar
C. Both a and b
D. None of the above
Right Answer: A. Fly wheel
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Inter molecular cohesive force in the fluids is?
A. less than that of the solids
B. more than that of the solids
C. equal to that of the solids
D. unpredictable
Right Answer: A. less than that of the solids
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Modulus of resilience is the ratio of?
A. minimum strain energy and unit volume
B. maximum stress energy and unit volume
C. proof resilience and unit volume
D. resilience and unit area
Right Answer: C. proof resilience and unit volume
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Shape factor is also called as?
A. view factor
B. geometry factor
C. configuration factor
D. all of the above
Right Answer: D. all of the above
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Why are rigid couplings used?
A. To connect diesel engine and generator
B. To connect eccentric shafts
C. To connect electric motor to pump
D. None of the above
Right Answer: C. To connect electric motor to pump
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Which of the following is a power transmitting element?
A. Nuts and bolts
B. Sprockets and chains
C. Axles
D. All of the above
Right Answer: B. Sprockets and chains
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Secondary force in reciprocating engine mechanism is caused due to?
A. S.H.M. of reciprocating parts
B. oscillation of reciprocating parts
C. obliquity of arrangement of reciprocating parts
D. all of the above
Right Answer: C. obliquity of arrangement of reciprocating parts
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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
Total 0 Votes:
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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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The process of lowering the temperature of a liquid below its freezing point is known as?
A. supercooling
B. undercooling
C. Both a and b
D. None of the above
Right Answer: C. Both a and b
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What is a free-shaft turbine?
A. the separate turbine which is used only to run compressor
B. the separate turbine which is placed on another shaft on which the compressor is not run
C. the separate turbine which is used only to run condenser
D. all of the above
Right Answer: B. the separate turbine which is placed on another shaft on which the compressor is not run
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Which type of vibrations are also known as transient vibrations?
A. Undamped vibrations
B. Damped vibrations
C. Torsional vibrations
D. Transverse vibrations
Right Answer: B. Damped vibrations
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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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Which of the following can be considered as more compact efficient heat exchanger?
A. Car radiators
B. Stirling engine regenerator
C. Ceramic regenerator in gas turbine
D. none of the above
Right Answer: B. Stirling engine regenerator
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The motion of a system executing harmonic motion with one natural frequency is known as?
A. principal mode of vibration
B. natural mode of vibration
C. Both a and b
D. None of the above
Right Answer: C. Both a and b
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The substance which is homogeneous and invariable in chemical composition throughout its mass is called as?
A. ideal substance
B. pure substance
C. solid substance
D. none of the above
Right Answer: B. pure substance
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What is used as an intercooler in multistage compression of vapour compression refrigeration system?
A. water
B. air
C. refrigerant itself
D. none of the above
Right Answer: C. refrigerant itself
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