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.
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Mechanical Engineering Mcqs Online With Answers for NTS PPSC Entry Test Classes
Mechanical Engineering
Mechanical Engineering Mcqs with Answers Solved
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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To predict failure in design components which failure criteria is not assumed, when mean stress and stress amplitude are nonzero?
A. Goodman criterion
B. Soderberg criteria
C. Gerber criteria
D. None of the above
Right Answer: D. None of the above
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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 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 of the following is a hydraulic cylinder based on application?
A. welded
B. bolted
C. ram
D. all of the above
Right Answer: C. ram
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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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Waterfall method is observed in?
A. product design and development
B. quality circle
C. brain storming
D. flow chart
Right Answer: A. product design and development
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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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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 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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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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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 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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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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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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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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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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Which device used to separate condensate from the steam without letting steam escape?
A. condenser
B. steam valve
C. steam trap
D. none of the above
Right Answer: C. steam trap
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If (Vw1 u1 – Vw2 u2), then machine is called as?
A. compressor
B. turbine
C. pump
D. all of the above
Right Answer: B. turbine
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Which surface can be best described as a radiation shield?
A. the surface which has very high absorptivity
B. the surface which has very high transmissivity
C. the surface which has very high reflectivity
D. none of the above
Right Answer: C. the surface which has very high reflectivity
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A model of casting, constructed to use for forming a mould in damp sand, is called as?
A. sand construction
B. pattern
C. cover
D. none of the above
Right Answer: A. pattern
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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 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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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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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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An ideal flow of any fluid must fulfil the following?
A. Newton’s law of viscosity
B. Newton’s law of motion
C. Boundary layer theory
D. Pascals law
E. Continuity equation
Right Answer: Continuity equation
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Large sized and heavy shell-and-tube heat exchangers are suitable for?
A. automotive applications
B. aircraft applications
C. marine applications
D. none of the above
Right Answer: D. none of the above
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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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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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If a pump gives higher flow rate to the valve then, pressure drop in the valve?
A. Increases
B. Decreases
C. Remain same
D. None of the above
Right Answer: A. Increases
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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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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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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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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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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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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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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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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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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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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 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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Head loss hf due to friction is given by?
A. 4 ƒ l v2 / g d
B. 4 f2 l ν / 2 g d
C. 2 ƒ l v 2 / 2 g d
D. 4 ƒ l v2 / 2 g d
Right Answer: D. 4 ƒ l v2 / 2 g d
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Calculate the cutting speed of drilling operation when diameter of drill is 10 mm and rotational speed of drill is 200 r.p.m.?
A. 6.283 m/min
B. 3.142 m/min
C. 8.362 m/min
D. 10.216 m/min
Right Answer: A. 6.283 m/min
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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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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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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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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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The aim of Just-In-Time manufacturing principle is to eliminate?
A. time wastage
B. labour wastage
C. cost of excessive inventory
D. all of the above
Right Answer: D. all of the above
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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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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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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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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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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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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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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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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 dryness fraction (x) on saturated vapour line?
A. x = 0
B. x = 1
C. x = 0.9
D. x = 0.5
Right Answer: B. x = 1
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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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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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The plastic materials which do not undergo chemical change when heated are?
A. Thermoplasts
B. Thermosets
C. Both a and b
D. None of these
Right Answer: A. Thermoplasts
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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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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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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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Heat pump is used ?
A. to transform low grade rejected heat into high temperature heat source
B. to transform high grade rejected heat into low temperature heat sink
C. Both a and b
D. None of the above
Right Answer: B. to transform high grade rejected heat into low temperature heat sink
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The resultant hydrostatic force acts through a point known as?
A. Centre of gravity
B. Centre of buoyancy
C. Centre of Pressure
D. None of the above
Right Answer: Centre of Pressure
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Which type of mechanism is used in shaper machine?
A. Indexing mechanism
B. Four-bar chain mechanism
C. Quick return mechanism
D. None of the above
Right Answer: C. Quick return mechanism
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The units of surface tension are?
A. Same as units of force
B. Energy/unit area
C. Force/unit area
D. It is dimensionless
E. None of the above
Right Answer: Energy/unit area
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At the state of perfect order (W = 1) of pure crystalline substance, how is the zero entropy defined?
A. entropy at 0 °C temperature
B. entropy at absolute zero temperature
C. entropy at the freezing point of the substance
D. none of the above
Right Answer: B. entropy at absolute zero temperature
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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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A closed feedwater heater system?
A. has high heat transfer capacity
B. requires pump at each heater to handle the large feedwater stream
C. requires only single pump regardless of the number of heaters
D. does not require any pump as the extracted steam and feedwater are not allowed to mix
Right Answer: C. requires only single pump regardless of the number of heaters
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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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What is a gray body?
A. a body of which the monochromatic emissivity (ε) is different wavelengths
B. a body of which the monochromatic emissivity (ε) is constant for the entire wavelength spectrum
C. a body of which the monochromatic emissivity (ε) is maximum for longest wavelength
D. none of the above
Right Answer: B. a body of which the monochromatic emissivity (ε) is constant for the entire wavelength spectrum
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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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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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What is the ratio of the actual work absorbed by an axial flow compressor to the theoretical work called?
A. Work input factor
B. Workdone factor
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 is a type of untuned vibration absorber?
A. Houdaille damper
B. Torsional vibration absorber
C. Centrifugal pendulum absorber
D. All of the above
Right Answer: A. Houdaille damper
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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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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 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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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 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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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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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 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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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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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 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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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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The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at the point, is called as?
A. path line
B. streak line
C. filament line
D. stream line
Right Answer: D. stream line
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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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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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The rate at which the solar energy reaching the earth’s atmosphere is called as?
A. solar constant
B. radiation constant
C. electromagnetic constant
D. atmospheric constant
Right Answer: A. solar constant
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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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The process of filling the liquid into the suction pipe and pump casing upto the level of delivery valve is called as?
A. filling
B. pumping
C. priming
D. leveling
Right Answer: D. priming
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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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Factor of safety is the ratio of?
A. working stress and ultimate strength
B. yield strength and endurance strength
C. ultimate strength and yield strength
D. yield strength and working stress
Right Answer: D. yield strength and working stress
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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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The region at which the Joule-Kelvin coefficient is negative is called as?
A. cooling region
B. heating region
C. negative region
D. positive region
Right Answer: B. heating region
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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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