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
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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Newton’s law of viscosity relates?
A. Shear stress and rate of angular deformation in a fluid
B. Yield shear stress, rate of angular deformation and viscosity
C. Pressure, velocity and viscosity
D. Shear stress, temperature, viscosity and velocity
E. Pressure, vicosity and rate of angular deformation
Right Answer: Shear stress and rate of angular deformation in a fluid
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Which type of bearings are known as anti friction bearings?
A. Sliding contact bearings
B. Rolling contact bearings
C. Both a and b
D. None of the above
Right Answer: B. Rolling contact bearings
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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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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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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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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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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 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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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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1 atm pressure is equivalent to?
A. 1.01315 x 105 N/m2
B. 700 mm Hg
C. 1.0133 x 105 kg/m-sec2
D. 1.0133 x 106 kg/cm-sec2
E. Any of the above
Right Answer: Any of the above
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What are bulk loads?
A. Lump of material
B. Single rigid mass
C. Homogeneous particles
D. Heterogeneous particles
Right Answer: B. Single rigid mass
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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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What is sensible cooling of air?
A. the cooling in which sensible heat of air is removed in order to reduce temperature
B. the cooling in which temperature of air is reduced without changing in its moisture content
C. both a and b
D. none of the above
Right Answer: C. both a and b
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he process of joining two pieces of metal with a different fusible metal applied in a molten state is called as?
A. welding
B. soldering
C. Both a and b
D. None of the above
Right Answer: B. soldering
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The application factor depends on?
A. prime mover
B. hours of operation per day
C. machine driven
D. all of the above
Right Answer: D. all of the above
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In which of these applications Bernoulli’s principle is widely used?
A. design of blowers
B. design of aircraft wings
C. design of propellers
D. All of the above
Right Answer: D. All of the above
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Mercury is generally used in barometer because?
A. Of higher density due to which the height of barmeter will be small
B. It has practically zero vapour pressure
C. It shines and can be easily read
D. It does not stick to the tube walls
E. All above
Right Answer:Of higher density due to which the height of barmeter will be small
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What is the process, in which the metal is caused to flow through a restricted orifice to create an extremely elongated strip of uniform and comparatively smaller cross-sectional area, called?
A. Rolling
B. Extrusion
C. Drawing
D. Spinning
Right Answer: B. Extrusion
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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 equation of continuity of flow is applicable when?
A. The flow is one dimensional
B. The flow is steady
C. The flow is compressive
D. The velocity is uniform over the cross section
E. None of the above
Right Answer: None of the above
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If pressure ratio in Brayton cycle increases?
A. the efficiency of the cycle increases
B. the efficiency of the cycle decreases
C. there is no any effect on the efficiency of the cycle
D. cannot say
Right Answer: A. the efficiency of the cycle increases
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Which of the following is used as an accessory in hydraulic power unit?
A. pumps
B. valves
C. motor
D. reservoir
Right Answer: D. reservoir
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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 foundation of the centre lathe is called as?
A. carriage
B. tray
C. base
D. bed
Right Answer: D. bed
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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 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 dew point temperature is less than the wet bulb temperature for?
A. saturated air
B. unsaturated air
C. both saturated and unsaturated air
D. none of the above
Right Answer: B. unsaturated air
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Which of the following is/are characteristic/s of mechatronic products and systems?
A.Functional interaction between mechanical, electronic and information technologies
B. Spacial interaction of subsystems in one physical unit
C. Intelligence related to the control functions of the mechatronics system
D. All of the above
Right Answer: D. All of the above
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The Weber number is the ratio of?
A. Inertial forces to surface tension force
B. Intertial forces to viscous forces
C. Elastic forces to pressure forces
D. Viscous forces to gravity
E. Elastic forces to gravity
Right Answer: Inertial forces to surface tension force
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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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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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Adding an additive to water glycol fluids improves?
A. flammability
B. viscosity
C. oxidation
D. all of the above
Right Answer: B. viscosity
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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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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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What is the product of sectional modulus and allowable bending stress called as?
A. Moment of inertia
B. Moment of rigidity
C. Moment of resistance
D. Radius of gyration
Right Answer: C. Moment of resistance
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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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The units of dynamic viscosity are?
A. Newton-sec/m2
B. Newton/m2-sec
C. kg-sec/m
D. kg m2/sec
E. m2/sec
Right Answer: Newton-sec/m2
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What is the relation between thermodynamic probability (W) and entropy?
A. thermodynamic probability increases with entropy
B. thermodynamic probability decreases with entropy
C. thermodynamic probability does not change with change in with entropy
D. none of the above
Right Answer: A. thermodynamic probability increases with entropy
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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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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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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 phases of designing of heat exchangers does designer consider corrosive nature of the fluid in?
A. The thermal analysis
B. The mechanical design
C. The design for manufacture
D. none of the above
Right Answer: B. The mechanical design
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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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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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Solid length for helical compression springs having square and ground ends is given as?
A. (n + 2)d
B. (n + 3)d
C. (n + 1)d
D. None of the above
Right Answer: A. (n + 2)d
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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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Which type of chips form while machining of brittle materials?
A. continuous chipsq
B. discontinuous chips
C. Built-up chips
D. all of the above with some proportion
Right Answer: B. discontinuous chips
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Which of the following is a not a surface finishing process?
A. Honing
B. Buffing
C. Lapping
D. Turning
Right Answer: D. Turning
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The flow of water in a pipe of diameter 3000 mm can be measured by?
A. Venturimeter
B. Rotameter
C. Nozzle
D. Pitot tube
E. Orifice plate
Right Answer: Pitot tube
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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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Heat transfer is?
A. a point function
B. a path function
C. a transfer function
D. none of the above
Right Answer: B. a path function
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Which among the following is the fundamental equation of S.H.M.?
A. x + (k / m) x =0
B. x + ω2x =0
C. x + (k/ m)2 x =0
D. x2 + ωx2 =0
Right Answer: D. x2 + ωx2 =0
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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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In four stroke cycle engine, cycle is completed in?
A. two strokes of the piston
B. two revolutions of the crankshaft
C. three strokes of the piston
D. four revolutions of the crankshaft
Right Answer: B. two revolutions of the crankshaft
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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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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 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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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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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 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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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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How is the incident radiation absorbed by a gas layer?
A. A gas layer absorbs incident radiation slowly
B. A gas layer absorbs incident radiation rapidly
C. doesn’t matter
D. unpredictable
Right Answer: A. A gas layer absorbs incident radiation slowly
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An ideal flow of any liquid must fulfil?
A. Newton’s second law of motion
B. Bernulli’s theorem
C. The Newton’s law of viscosity
D. Law of conservation of energy
E. Countinuity equation
Right Answer: Countinuity equation
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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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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 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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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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The passage of uniformly varying cross-section in which the kinetic energy of steam increases at the expense of its pressure is called as?
A. steam turbine
B. steam nozzle
C. steam area
D. all of the above
Right Answer: B. steam nozzle
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What is the ratio of the buoyancy force to the viscous force acting on a fluid called?
A. Prandtl number (Pr)
B. Reynolds number (Re)
C. Nusselt number (Nu)
D. Grashof number (Gr)
Right Answer: D. Grashof number (Gr)
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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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Density in terms of viscosity is?
A. Kinematic viscosity/Dynamic viscosity
B. Dynamic viscosity/Kinematic viscosity
C. Kinematic viscosity x dynamic viscosity
D. Any of the above
E. None of the above
Right Answer: Dynamic viscosity/Kinematic viscosity
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The reheat cycle allows steam power plant?
A. to use higher pressure ratio
B. to maintain required quality of steam at the exit of the turbine
C. to increase the turbine work
D. all of the above
Right Answer: D. all of the above
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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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he materials such as lead and barium, which are added with polymers to minimize the effect of heat, sunlight and ozone are called as?
A. binders
B. blenders
C. stabilisers
D. fillers
Right Answer: C. stabilisers
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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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In turbofan engine, the bypass ratio is the ratio of?
A. total mass flow rate of exhaust stream to the mass flow rate of stream from turbine exhaust
B. total mass flow rate of exhaust stream to the mass flow rate of stream from fan exhaust
C. the mass flow rate of stream from turbine exhaust to the mass flow rate of stream from fan exhaust
D. the mass flow rate of stream from fan exhaust to the mass flow rate of stream from turbine exhaust
Right Answer: D. the mass flow rate of stream from fan exhaust to the mass flow rate of stream from turbine exhaust
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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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In a flowing fluid, a particle may possess?
A. Inertial energy
B. Pressure energy
C. Kinetic energy
D. Elevation or gravitation potential energy
E. All the above
Right Answer: All the above
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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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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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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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Gas welding is a type of?
A. constant mass process
B. material removal process
C. material addition process
D. none of the above
Right Answer: C. material addition process
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Froude number is useful in calculations for?
A. Water hammer
B. Flow through pipes
C. Hydraulic jump
D. Surface tension force
E. Compressible flow problems
Right Answer: Hydraulic jump
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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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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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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 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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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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Which of the following is an example of constant mass manufacturing process?
A. Rolling
B. Turning
C. Broaching
D. Sawing
Right Answer: A. Rolling
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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 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 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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The vapour absorption refrigeration system is?
A. more noisy than the vapour compression refrigeration system
B. more silent than the vapour compression refrigeration system
C. equally noisy as the vapour compression refrigeration system
D. it depends upon plant capacity
Right Answer: B. more silent than the vapour compression refrigeration system
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Several machine tools can be controlled by a central computer in?
A. NC (Numerical Control) machine tool
B. CNC (Computer Numerical Control) machine tool
C. DNC (Direct Numerical Control) machine tool
D. CCNC (Central-Computer Numerical Control) machine tool
Right Answer: C. DNC (Direct Numerical Control) machine tool
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What is the correct formula for The Biot number?
A. hl/k
B. k/hl
C. l/hk
D. hk/l
Right Answer: A. hl/k
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What is the maximum angle between cylinder block and shaft axis?
A. 30o
B. 50o
C. 45o
D. all of the above
Right Answer: A. 30o
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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
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Which of the following is the reference pressure often referred to as threshold of hearing at 1000 Hz?
A. 5 x 10-5 N/m2
B. 3 x 10-5 N/m2
C. 2 x 10-5 N/m2
D. None of the above
Right Answer: C. 2 x 10-5 N/m2
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