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
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 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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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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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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The critical radius of a hollow sphere having thermal conductivity k and ho as convecting heat transfer coefficient of outer fluid is given by?
A. ho / k
B. k / ho
C. 2k / ho
D. ho / 2k
Right Answer: C. 2k / ho
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The shear stress velocity gradient relation of the Newtonian fluids is?
A. Linear
B. Parabolic
C. Hyperbolic
D. Involutic
E. There is no such relation
Right Answer: Linear
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What is the head of water available at turbine inlet in hydro-electric power plant called?
A. head race
B. tail race
C. gross head
D. net head
Right Answer: D. net head
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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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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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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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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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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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Angle of swash plate in axial piston pump is adjusted by?
A. compensator
B. yoke
C. Both a and b
D. None of these
Right Answer: C. Both a and b
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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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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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Shear stress energy theory is called as?
A. distortion theory
B. Von Mises theory
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 methods can be used to control the noise level at source?
A. Changing design process
B. Using sound enclosures
C. Controlling vibration
D. All of the above
Right Answer: D. All of the above
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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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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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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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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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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 type of tolerance does a slip gauge have?
A. Unilateral tolerance
B. Bilateral tolerance
C. Both a and b
D. None of the above
Right Answer: B. Bilateral tolerance
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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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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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A hydrometer is used to determine?
A. Relative humidity
B. Buoyancy force
C. Specific gravity of liquids
D. Viscosity of liquids
E. Surface tension
Right Answer: Specific gravity of liquids
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According to Taylor’s principle which type of gauge checks both size and geometric features?
A. Go gauge
B. No go gauge
C. Both a and b
D. None of the above
Right Answer: A. Go gauge
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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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In working condition of turbojet engine, velocity of air entering the engine is?
A. higher than the velocity of exhaust gases leaving the engine
B. lower than the velocity of exhaust gases leaving the engine
C. equal to the velocity of exhaust gases leaving the engine
D. cannot say
Right Answer: B. lower than the velocity of exhaust gases leaving the engine
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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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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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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 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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If welds are designed with in-plane eccentric load, then eccentric load can be replaced by?
A. parallel force
B. twisting moment
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 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 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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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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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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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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What are the minimum number of kinematic pairs required in a kinematic chain?
A. 2 kinematic pairs
B. 3 kinematic pairs
C. 4 kinematic pairs
D. None of the above
Right Answer: C. 4 kinematic pairs
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In the metal cutting process, when the compression limit of the metal in front of the cutting tool has been exceeded then it is separated from workpiece and flows?
A. elastically
B. plastically
C. rigidly
D. none of the above
Right Answer: B. plastically
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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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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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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 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 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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The vertical component of pressure force on a submerged curved surface is equal to?
A. Its horizontal component
B. The force on a vertical projection of the curved surface
C. The product of pressure at centroid and surface area
D. The weight of liquid vertically above the curved surface
E. None of the above
Right Answer: The weight of liquid vertically above the curved surface
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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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Which force causes vanes to come out of the rotor slots?
A. centripetal force
B. centrifugal force
C. friction force
D. none of the above
Right Answer: A. centripetal force
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SI unit of viscosity is?
A. 10 times poise
B. 9.81 times poise
C. 1/9.81 times poise
D. Equal to poise
E. None of the above
Right Answer: 10 times poise
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Which flat belt drive system has two pulleys mounted on driven shaft and one pulley on driving shaft?
A. Multiple belt drive
B. Cone pulley drive
C. Fast and loose pulley drive
D. None of the above
Right Answer: C. Fast and loose pulley drive
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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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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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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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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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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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A hydro-electric site has a head of 100 m and an average discharge of 10m3/s. Assume 92% efficiency, for a greater speed of 6000 rpm, the specific speed of turbine would be?
A. 600
B. 1000
C. 1500
D. 1900
E. None of the above
Right Answer: 600
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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 process in which no heat transfer takes place through boundaries is called as?
A. isothermal process
B. adiabatic process
C. isochoric process
D. none of the above
Right Answer: B. adiabatic process
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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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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 type of frequency measuring instrument has multiple reeds of different natural frequency to measure vibrations?
A. Fullarton tachometer
B. Frahm Tachometer
C. Both a and b
D. None of the above
Right Answer: B. Frahm Tachometer
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The continuity equation?
A. Expresses relationship between hydraulic parameters of flow
B. Expresses the relation between work and energy
C. Is based on Bernoulli’s theorem
D. Is a relation for the momentum per unit volume for two points on a stream line
E. Relates the mass rate of flow along a stream line
Right Answer: Relates the mass rate of flow along a stream line
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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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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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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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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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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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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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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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Knife Line Attack is a type of?
A. bimetal corrosion
B. intergranular corrosion
C. localized corrosion
D. uniform corrosion
Right Answer: B. intergranular corrosion
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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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The angle between side cutting edge and end cutting edge is called as?
A. approach angle
B. nose angle
C. side relief angle
D. end relief angle
Right Answer: B. nose angle
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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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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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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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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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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 isentropic flow, the temperature?
A. Cannot exceed the reservoir temperature
B. Cannot drop and then increase again downstream
C. Is independent of Mach number
D. Is a function of Mach number only
E. Remains constant in a duct flow
Right Answer: Cannot exceed the reservoir temperature
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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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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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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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Magnitude of eddy viscosity for laminar flow is?
A. Less than zero
B. Zero
C. Greater than zero
D. Unpredictable
Right Answer: B. Zero
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What is quality assurance?
A. Quality assurance deals with activities which prove that products and services meet the required quality standard
B. Quality assurance deals with activities which aim at customers satisfaction
C. Quality assurance deals with controlling the quality of products by inspection
D. All of the above
Right Answer: A. Quality assurance deals with activities which prove that products and services meet the required quality standard
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Why are mechanical springs used?
A. To apply force
B. To store energy
C. To measure force
D. All of the above
Right Answer: D. All of the above
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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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A stationary body immersed in a river has a maximum pressure of 69 Kpa exerted on it at a distance of 5.4 m below the free surface. What velocity of river could be expected ?
A. 9 m/sec
B. 5.4 m/sec
C. 3.82 m/sec
D. 5.67 m/s
E. None of the above
Right Answer: 5.67 m/s
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The moisture content lines in psychrometric chart are also called as?
A. relative humidity lines
B. specific humidity lines
C. Both a and b
D. none of the above
Right Answer: B. specific humidity lines
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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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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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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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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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The hydraulic system is?
A. less precise than pneumatic system
B. more precise than pneumatic system
C. both hydraulic and pneumatic systems are same on basis of precision
D. None of the above
Right Answer: B. more precise than pneumatic system
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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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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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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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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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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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Assume that a reversible heat engine is operating between a source at T1 and a sink at T2. If T2 decreases, the efficiency of the heat engine?
A. decreases
B. increases
C. remains constant
D. none of the above
Right Answer: B. increases
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1 lb/in2 pressure is equivalent to?
A. 144 lb/ft2
B. 6.8046 x 10-2
C. 6.8947 x 103 kg/m-sec2
D. 0.06895 bar
E. Any of the above
Right Answer: Any of the above
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