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Mechanical Engineering Mcqs Online With Answers
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
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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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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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 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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Heat in thermal system is analogous to __________ in electrical energy.
A. current
B. potential difference
C. resistance
D. charge
Right Answer: D. charge
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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 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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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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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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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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Why are mechanical springs used?
A. To apply force
B. To store energy
C. To measure force
D. All of the above
Right Answer: D. All of the above
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Which among the following is the value of static deflection (δ) for a fixed beam with central point load?
A. (Wl3) /(192 EI)
B. (Wl2) /(192 EI)
C. (Wl3) /(384 EI)
D. None of the above
Right Answer: A. (Wl3) /(192 EI)
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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 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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What is the advantage of multiple piston pump?
A. multiple piston pump do not have pulsating flow
B. multiple piston pump have pulsating flow which is required
C. Both a and b
D. None of these
Right Answer: A. multiple piston pump do not have pulsating flow
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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 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 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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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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The gates of aerofoil section in between the outer and inner ring of guide wheel are called as?
A. guide gates
B. guide vanes
C. scrolling gates
D. scrolling vanes
Right Answer: B. guide vanes
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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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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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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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he materials such as lead and barium, which are added with polymers to minimize the effect of heat, sunlight and ozone are called as?
A. binders
B. blenders
C. stabilisers
D. fillers
Right Answer: C. stabilisers
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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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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 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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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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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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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 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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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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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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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 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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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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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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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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The component of acceleration due to change in the direction of velocity vector is called as?
A. direction acceleration
B. tangential acceleration
C. normal acceleration
D. cannot say
Right Answer: D. normal acceleration
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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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What is the head of water available at turbine inlet in hydro-electric power plant called?
A. head race
B. tail race
C. gross head
D. net head
Right Answer: D. net head
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What is used as an intercooler in multistage compression of vapour compression refrigeration system?
A. water
B. air
C. refrigerant itself
D. none of the above
Right Answer: C. refrigerant itself
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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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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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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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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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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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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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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 natural convection, the Nusselt number (Nu) depends on?
A. Pr and Re
B. Gr and Re
C. Gr and Pr
D. none of the above
Right Answer: C. Gr and Pr
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What does the boring mean?
A. a process of making a hole in an object
B. a process of enlarging a hole which is already in an object
C. a process of finishing an existing hole very smoothly and accurately in size
D. None of the above
Right Answer: B. a process of enlarging a hole which is already in an object
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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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Beam engine mechanism is an example of?
A. double crank mechanism
B. double lever mechanism
C. crank and lever mechanism
D. none of the above
Right Answer: C. crank and lever mechanism
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What is the ratio of isentropic work to Euler work in an centrifugal compressor called?
A. Work coefficient
B. Velocity coefficient
C. Pressure coefficient
D. Flow coefficient
Right Answer: C. Pressure coefficient
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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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The process of chamfering the entrance of a drilled hole is known as?
A. counter-boring
B. counter-sinking
C. counter-fillet
D. trepanning
Right Answer: B. counter-sinking
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Casting replica used to make the cavity is called as?
A. Mould
B. Pattern
C. Cope
D. None of the above
Right Answer: B. Pattern
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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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The normal stress is the same in all directions at a point in fluid?
A. Regardless of the motion of one fluid layer relative to an adjacent layer
B. When there is no motion of one fluid layer relative to an adjacent layer
C. Only when the fluid is frictionless
D. Only when fluid is frictionless and incompressible
E. Only when the fluid has zero viscosity and is at rest
Right Answer: When there is no motion of one fluid layer relative to an adjacent layer
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he process of joining two pieces of metal with a different fusible metal applied in a molten state is called as?
A. welding
B. soldering
C. Both a and b
D. None of the above
Right Answer: B. soldering
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Which design consideration deals with appearance of the product?
A. Ergonomics
B. Aesthetics
C. System design
D. Creative design
Right Answer: B. Aesthetics
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Angle of swash plate in axial piston pump is adjusted by?
A. compensator
B. yoke
C. Both a and b
D. None of these
Right Answer: C. Both a and b
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What are the minimum number of kinematic pairs required in a kinematic chain?
A. 2 kinematic pairs
B. 3 kinematic pairs
C. 4 kinematic pairs
D. None of the above
Right Answer: C. 4 kinematic pairs
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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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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 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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The horizontal component of force on a curved surface is equal to the?
A. Weight of liquid vertically above the curved surface
B. Weight of liquid retained by the curved surface
C. Product of pressure at its centroid and area
D. Force on a projection of the curved surface into a vertical plane
E. Scalar sum of all elemented horizontal components
Right Answer: Force on a projection of the curved surface into a vertical plane
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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 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 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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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 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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The units of dynamic viscosity are?
A. Newton-sec/m2
B. Newton/m2-sec
C. kg-sec/m
D. kg m2/sec
E. m2/sec
Right Answer: Newton-sec/m2
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A perfect gas?
A. Has zero viscosity
B. Has constant viscosity
C. Satisfies the relation PV = mRT
D. Is incompressible
E. None of the above
Right Answer: Satisfies the relation PV = mRT
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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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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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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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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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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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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 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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Which force causes vanes to come out of the rotor slots?
A. centripetal force
B. centrifugal force
C. friction force
D. none of the above
Right Answer: A. centripetal force
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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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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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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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The shear stress velocity gradient relation of the Newtonian fluids is?
A. Linear
B. Parabolic
C. Hyperbolic
D. Involutic
E. There is no such relation
Right Answer: Linear
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One poise is equivalent to?
A. 360 kg/m-hr
B. 1 dyne sec/cm2
C. 1/98.1 kgf sec/m2
D. 10-1 kg/m-sec
E. Any of the above
Right Answer: Any of the above
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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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At the critical radius of insulation of a hollow sphere, the heat transfer will be?
A. minimum
B. maximum
C. does not change
D. unpredictable
Right Answer: B. maximum
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Which type of key consists of two square tapered keys placed 90o apart?
A. Tangent key
B. Kennedy key
C. Saddle key
D. Woodruff key
Right Answer: B. Kennedy key
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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 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 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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Adding an additive to water glycol fluids improves?
A. flammability
B. viscosity
C. oxidation
D. all of the above
Right Answer: B. viscosity
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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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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 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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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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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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