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
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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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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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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Heat transfer is?
A. a point function
B. a path function
C. a transfer function
D. none of the above
Right Answer: B. a path function
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Which among the following engines is NOT the type of aircraft gas turbine which works on jet propulsion cycle?
A. turbojet
B. turbofan
C. turboprop
D. none of the above
Right Answer: D. none of the above
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Newton’s law of viscosity relates?
A. Shear stress and rate of angular deformation in a fluid
B. Yield shear stress, rate of angular deformation and viscosity
C. Pressure, velocity and viscosity
D. Shear stress, temperature, viscosity and velocity
E. Pressure, vicosity and rate of angular deformation
Right Answer: Shear stress and rate of angular deformation in a fluid
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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 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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Alcohol is used in manometers because?
A. It provides a suitable meniscus for the inclined tube
B. Its density being less can provide longer length for a pressure difference, thus more accuracy can be obtained
C. (A) and (B) above
D. Cheap and easily availale
E. Its vapour pressure is low
Right Answer: (A) and (B) above
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What is the purpose of using a gear box?
A. To increase torque
B. To increase speed
C. Converts single input speed into multiple output speeds
D. All of the above
Right Answer: D. All of the above
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The increase of temperature?
A. Increases the viscosity of a fluid
B. Decreases the viscoisty of a fluid
C. Decreases the viscosity of a gas
D. Increases the viscosity of a gas
E. None of the above
Right Answer: B & D
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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 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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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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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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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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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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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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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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An object having 20 kg mass weighs 19.60 kg on a spring type balance. The value of ‘g’ in m/sec2 for the place is?
A. 1000
B. 9.8
C. 9.9
D. 10.2
E. 10.1
Right Answer: 9.9
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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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What is the entropy of the system at equilibrium state?
A. Zero
B. Minimum
C. Maximum
D. constant but not maximum
Right Answer: C. Maximum
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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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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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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 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 acceleration has a nonzero value in uniform flow?
A. Local acceleration
B. Convective acceleration
C. Both local as well as convective acceleration
D. unpredictable
Right Answer: A. Local acceleration
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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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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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What will be the sound power level, if a machine generates 20 W power?
A. 124 dB
B. 133 dB
C. 150 dB
D. 200 dB
Right Answer: B. 133 dB
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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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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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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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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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Identify the incorrect statement. Apparent shear forces?
A. Can never occur in frictionless fluid regardless of its motion
B. Can never occur when the fluid is at rest
C. Depend upon cohesive forces
D. Depend upon molecular interchange of momentum
E. May occur owing to cohesion when the fluid is at rest
Right Answer: May occur owing to cohesion when the fluid is at rest
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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 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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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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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 of the following construction equipments have highest noise level?
A. Compressors
B. Generators
C. Pneumatic wrenches
D. Pumps
Right Answer: C. Pneumatic wrenches
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The function of _________ is to convert high kinetic energy of gases into pressure energy.
A. impeller
B. diffuser
C. casing
D. None of the above
Right Answer: B. diffuser
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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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According to Joule’s law, the internal energy of a perfect gas is the function of absolute?
A. Density
B. Pressure
C. Temperature
D. Volume
Right Answer: C. Temperature
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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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When the thickness of an insulation is greater than the critical thickness of insulation, then the heat transfer rate of insulated pipe?
A. will be more than the heat transfer rate from the same pipe without insulation
B. will be less than the heat transfer rate from the same pipe without insulation
C. will become equal to the heat transfer rate from the same pipe without insulation
D. none of the above
Right Answer: B. will be less than the heat transfer rate from the same pipe without insulation
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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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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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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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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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Deformation per unit length is called as?
A. Strain
B. Stress
C. Modulus of elasticity
D. None of the above
Right Answer: A. Strain
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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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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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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 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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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 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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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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What are bulk loads?
A. Lump of material
B. Single rigid mass
C. Homogeneous particles
D. Heterogeneous particles
Right Answer: B. Single rigid mass
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Which of the following is a machine shaft?
A. Line shaft
B. Counter shaft
C. Crankshaft
D. All of the above
Right Answer: C. Crankshaft
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The ratio of actual mass flow rate (ṁa) to ideal mass flow rate (ṁi) is called as?
A. nozzle coefficient
B. coefficient of nozzle friction
C. coefficient of discharge
D. coefficient of mass
Right Answer: C. coefficient of discharge
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The process of bevelling sharp ends of a workpiece is called as?
A. knurling
B. grooving
C. facing
D. chamfering
Right Answer: D. chamfering
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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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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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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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When frequency ratio (ω/ωn) is greater than unity, phase angle decreases as?
A. damping factor increases
B. damping factor decreases
C. Both a and b
D. None of the above
Right Answer: A. damping factor increases
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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 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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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 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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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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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 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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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 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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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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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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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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A liquid compressed in a cylinder has a volume of 1 litre at 1 MN/m2 and a volume of 995 cu-cm at 2 MN / m2. The bulk modulus of elasticity would be?
A. 200 Mpa
B. Mpa
C. 5 Mpa
D. 10 Mpa
E. 20 Mpa
Right Answer: 200 Mpa
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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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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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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 type of bearings are known as anti friction bearings?
A. Sliding contact bearings
B. Rolling contact bearings
C. Both a and b
D. None of the above
Right Answer: B. Rolling contact bearings
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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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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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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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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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Cylindrical roller bearings have greater?
A. axial load carrying capacity
B. thrust load carrying capacity
C. radial load carrying capacity
D. All of the above
Right Answer: C. radial load carrying capacity
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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
Total 0 Votes:
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0
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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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0
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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
Total 2 Votes:
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2
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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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0
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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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0
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Which of the following phases of designing of heat exchangers does designer consider corrosive nature of the fluid in?
A. The thermal analysis
B. The mechanical design
C. The design for manufacture
D. none of the above
Right Answer: B. The mechanical design
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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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0
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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
Total 0 Votes:
0
0
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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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0
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Gas turbines are suitable for aircraft propulsion because?
A. gas turbines are light weight
B. gas turbines are compact in size
C. gas turbines have a high power-to-weight ratio
D. all of the above
Right Answer: D. all of the above
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0
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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
Total 1 Votes:
0
1
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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
Total 0 Votes:
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0
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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
Total 0 Votes:
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0
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