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
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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In turbofan engine, fan is used?
A. to compress the inlet air more efficiently
B. to increase the total thrust of the engine
C. Both a and b
D. None of the above
Right Answer: B. to increase the total thrust of the engine
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What are the dimensions of force?
A. [M L T – 2 ] B. [M L T – 1 ] C. [M L 2 T – 2 ] D. [M L 2 T 2 ]
Right Answer: A. [M L T – 2 ]
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Which of the following methods can be used to reduce excitation level at the source?
A. Lubrication of joints
B. Balancing inertia forces
C. Both a and b
D. None of the above
Right Answer: C. Both a and b
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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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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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A bent axis piston pump has?
A. pump axis bent
B. cylinder block which is inclined at an angle to the drive shaft
C. Both a and b
D. None of the above
Right Answer: B. cylinder block which is inclined at an angle to the drive shaft
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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 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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What is the correct formula for the total emissive power of the gray body (Eg)?
A. (Eg) = ε σ T4
B. (Eg) = ε T4
C. (Eg) = (1/ε) σ T4
D. none of the above
Right Answer: (Eg) = ε σ T4
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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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An ideal fluid is?
A. Similar to a perfect gas
B. Frictionless and incompressible
C. One which obeys Newton’s law of viscosity
D. One which satisfies continuity equation
E. One which flows through pipes with least friction
Right Answer: Frictionless and incompressible
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If a relief valve has reliability of 0.989, how many failures are expected in testing 1000 such relief valves?
A. 111
B. 100
C. 10
D. 11
Right Answer: D. 11
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Which 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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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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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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How many strokes does a single piston pump need to discharge oil?
A. one stroke
B. two strokes
C. three strokes
D. None of the above
Right Answer: C. three strokes
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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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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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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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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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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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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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Four piezometer openings in the same cross-section of a cast iron pipe indicate the following pressure for simultaneous reading: 43, 42.6, 42.4 37 mm Hg. What value should be taken for the pressure?
A. 41.5
B. 43
C. 37
D. 42.67
E. None of the above
Right Answer: 42.67
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Which of the following processes is used for surface finishing?
A. Shaping
B. Broaching
C. Lapping
D. All of the above
Right Answer: C. Lapping
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Which 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 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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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 gas-refrigeration system is?
A. more heavy and bulky than the vapour compression cycle
B. less heavy and bulky than the vapour compression cycle
C. same in construction with the vapour compression cycle
D. none of the above
Right Answer: B. less heavy and bulky than the vapour compression cycle
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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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Which of the following characteristics does not affect the properties of plastics?
A. Their molecular structure
B. Their degree of polymerization
C. Both a and b
D. None of the above
Right Answer: D. None of the above
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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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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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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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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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Rankine-Gordon’s empirical formula is applicable for?
A. long column
B. short column
C. Both a and b
D. All of these
Right Answer: C. Both a and b
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The device which is used to remove workpiece from close-fitting locators, after the workpiece has been removed is called as?
A. remover
B. ejector
C. escaper
D. blocker
Right Answer: B. blocker
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The buoyancy forces which give rise to the natural convection are called as?
A. convection forces
B. fluid forces
C. body forces
D. none of the above
Right Answer: C. body forces
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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 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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Which type of screw fasteners are threaded through out its length?
A. Cap screws
B. Set screws
C. Studs
D. Tap bolt
Right Answer: B. Set screws
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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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A rotameter is a device used to measure?
A. Velocity of fluid in pipes
B. Velocity of gauges
C. Vortex flow
D. Flow of fluids
E. Density of fluids
Right Answer: Flow of fluids
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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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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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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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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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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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Which type of body is an airfoil?
A. streamline body
B. wave body
C. bluff body
D. induced body
Right Answer: A. streamline body
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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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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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The body whose surface does not coincide with the streamline when places in a flow is called as?
A. streamline body
B. wave body
C. bluff body
D. induced body
Right Answer: C. bluff body
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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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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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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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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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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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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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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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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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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 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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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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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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A pilot tube is used for the measurement of?
A. Pressure
B. Velocity
C. Viscosity
D. Surface tension
E. Flow rate
Right Answer: Velocity
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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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Which of the following is NOT a type of heat exchanger?
A. Recuperator
B. Regenerator
C. Mixer
D. none of the above
Right Answer: D. none 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 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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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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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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Rotary displacement pumps are suitable for handling?
A. oils
B. gritty liquids
C. both oils as well as gritty liquids
D. None of the above
Right Answer: A. oils
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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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The welding process by Metal Inert-Gas (MIG) welding is?
A. slower than the welding process by Tungsten Inert-Gas (TIG) welding
B. faster than the welding process by Tungsten Inert-Gas (TIG) welding
C. at same speed as the welding process by Tungsten Inert-Gas (TIG) welding
D. at unpredictable speed
Right Answer: B. faster than the welding process by Tungsten Inert-Gas (TIG) welding
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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 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 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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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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What is the load stress factor for cast iron gear pair if BHN = 300?
A. 1.89 N/mm2
B. 1.62 N/mm2
C. 1.44 N/mm2
D. 1.413 N/mm2
Right Answer: A. 1.89 N/mm2
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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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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 method is calculated considering geometric average of ordinates?
A. Centre line average method
B. Peak to valley height method
C. Root mean square method
D. All of the above
Right Answer: C. Root mean square method
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Which type of stress is induced in a screw thread ?
A. Torsional shear stress
B. Buckling load
C. Bearing pressure
D. All of the above
Right Answer: C. Bearing pressure
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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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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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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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The bulk modulus of elasticity?
A. Is independent of temperature
B. Increases with the pressure
C. Is independent of pressure and viscosity
D. Is larger when the fluid is more compressible
E. None of the above
Right Answer: Is independent of pressure and viscosity
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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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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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The thermocouple circuit which is used to measure temperature works on?
A. Seebeck effect
B. Peltier effect
C. Thomson effect
D. none of the above
Right Answer: A. Seebeck effect
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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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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 critical depth on a channel is given by?
A. h = v2/g
B. h = v2/2g
C. h = v/2g
D. h = 2v/g
E. h = v/g
Right Answer: h = v2/g
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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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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 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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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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1 N/m2 pressure is equivalent to?
A. 1 pascal
B. 10-5 bar
C. 10-2 kg/m sec2
D. 7.5 x 10-3 mm Hg
E. Any of the above
Right Answer: Any of the above
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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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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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