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
Which among the following is the basic air standard cycle for all modern gas turbine plants?
A. Brayton cycle
B. Rankine cycle
C. Otto cycle
D. Diesel cycle
Right Answer: A. Brayton cycle
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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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Which of the following errors are also known as cumulative errors?
A. Random errors
B. Systematic errors
C. Gross errors
D. System interaction errors
Right Answer: B. Systematic errors
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The device which place the workpiece in the same position, in jig and fixture, cycle after cycle is called as?
A. placing device
B. fixing device
C. locating device
D. positioning device
Right Answer: C. locating device
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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 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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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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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 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 of the following is not a reason to design and redesign a product?
A. Optimum design
B. Innovation
C. Appearance
D. None of the above
Right Answer: D. None of the above
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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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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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Strain energy stored in a uniform bar is given as?
A. (σ E/ 2A)
B. (σ L/ 2AE)
C. (σ2 AL/ 4E)
D. (σ2 AL/ 2E)
Right Answer: D. (σ2 AL/ 2E)
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How is the arrangement of pistons in piston pumps?
A. axially
B. radially
C. Both a and b
D. None of the above
Right Answer: C. Both a and b
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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 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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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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When the angle between surface tension with the liquid (θ) is greater than 90o, the liquid becomes?
A. flat
B. concave upward
C. convex upward
D. unpredictable
Right Answer: C. convex upward
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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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What effect does pitch error have on nut and bolt?
A. Major diameter of nut decreases and effective diameter of bolt increases
B. Effective diameter of nut decreases and effective diameter of bolt increases
C. Effective diameter of nut increases and effective diameter of bolt decreases
D. None of the above
Right Answer: B. Effective diameter of nut decreases and effective diameter of bolt increases
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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 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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What is the relation between absorptivity (α), reflectivity (ρ) and transmissivity (τ) for gray body?
A. ρ + α + τ =1
B. α + τ =1
C. ρ + τ =1
D. ρ + α =1
Right Answer: D. ρ + α =1
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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 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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The upper critical Reynolds number is?
A. Important from a design view point
B. The number at which turbulent flow changes to laminar flow
C. About 2000 D. Not more than 2000
E. Of no practical importance in pipe flow problems
Right Answer: About 2000 D. Not more than 2000
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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 is a not a surface finishing process?
A. Honing
B. Buffing
C. Lapping
D. Turning
Right Answer: D. Turning
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What is a syphon?
A. A long bend pipe used to carry water from a reservoir at a higher level to another reservoir at a lower level when two reservoirs are separated by a hill
B. A long bend pipe used to carry water from a reservoir at a lower level to another reservoir at a higher level with some work input when two reservoirs are separated by a hill
C. A long bend pipe used to carry water from one reservoir to another reservoir when two reservoirs are at same elevation
D. Unpredictable
Right Answer: A. A long bend pipe used to carry water from a reservoir at a higher level to another reservoir at a lower level when two reservoirs are separated by a hill
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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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ength of mercury column at a place at an altitude will vary with respect to that at ground in a?
A. Linear relation
B. Hyperbolic relation
C. Parabolic relation
D. Will remain constant
E. First slowly and then steeply
Right Answer: First slowly and then steeply
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Which characteristic of material is used in forging process?
A. characteristics of elasticity of material
B. characteristics of ductility of material
C. characteristics of plasticity of material
D. none of the above
Right Answer: C. characteristics of plasticity of material
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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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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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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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Which plastic materials contain strong cross linkings in their molecular structure?
A. Thermoplastic materials
B. Thermosetting materials
C. Both a and b
D. None of the above
Right Answer: B. Thermosetting materials
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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 fixtures are used for machining parts which must have machined details evenly spaced?
A. Profile fixtures
B. Duplex fixtures
C. Indexing fixtures
D. None of the above
Right Answer: C. Indexing fixtures
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When is the condensate flow almost always laminar?
A. when condensation occurs on a horizontal tube
B. when condensation occurs on a vertical bank of horizontal tubes
C. when condensation occurs on a vertical tube
D. when condensation occurs on a bunch of vertical tubes
Right Answer: A. when condensation occurs on a horizontal tube
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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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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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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 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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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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The Reynolds number for pipe flow is given by?
A. VD/v
B. VD
C. VD ? /
D. VD /
E. None of the above
Right Answer: VD ? /
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A simple pitot tube is used to measure?
A. The pressure in a static fluid
B. The velocity in a flowing stream
C. The total pressure
D. The dynamic pressure
E. The undistributed fluid pressure
Right Answer: The velocity in a flowing stream
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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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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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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 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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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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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 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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Calculate fatigue stress concentration factor, when theoretical stress concentration factor is 1.62 and notch sensitivity is equal to 0.9?
A. 1.558
B. 3.358
C. 1.162
D. None of the abvove
Right Answer: A.1.558
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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 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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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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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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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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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 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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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 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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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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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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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 material which holds the fine grains of abrasive material in grinding wheel is called as?
A. Compound
B. Bond
C. Hold
D. None of the above
Right Answer: B. Bond
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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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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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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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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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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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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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Jigs and fixtures are?
A. machining tools
B. precision tools
C. Both a and b
D. None of the above
Right Answer: B. precision tools
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The substance which is homogeneous and invariable in chemical composition throughout its mass is called as?
A. ideal substance
B. pure substance
C. solid substance
D. none of the above
Right Answer: B. pure substance
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What is 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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he process of creating mechanisms and shapes of mechanical elements for a machine to get the desired output for a given input is called as?
A. analysis
B. innovation
C. synthesis
D. designing
Right Answer: C. synthesis
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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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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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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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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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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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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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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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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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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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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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The pressure in millimetres of mercury gauge, equivalent to 68 mm H2O plus 54.4 mm manometer fluid, sp. Gr. 2.5 is?
A. 10
B. 12.5
C. 15.5
D. 17.5
E. 20
Right Answer: 15.5
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Ratio of two spindle speeds is constant in _________ progression.
A. Arithmetic
B. Geometric
C. Harmonic
D. None of the above
Right Answer: B. Geometric
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Which 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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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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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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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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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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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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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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Mercury is suitable for manometers because?
A. It has high density
B. It can be easily seen in tube
C. It does not stick to tube walls
D. It moves easily
E. It is generally not used in manometers
Right Answer: It is generally not used in manometers
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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 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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Friction factor for laminar flow is given by?
A. (Re /64)
B. (64 / Re)
C. (Re / 16)
D. (16 / Re)
Right Answer: B. (64 / Re)
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