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. 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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Which type of monitoring system uses stroboscope to measure speed of the machine?
A. Portable condition monitoring system
B. Basic condition monitoring system
C. Computer based condition monitoring system
D. None of the above
Right Answer: B. Basic condition monitoring system
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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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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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Factor of safety is the ratio of?
A. working stress and ultimate strength
B. yield strength and endurance strength
C. ultimate strength and yield strength
D. yield strength and working stress
Right Answer: D. yield strength and working stress
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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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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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Which pump is more suitable for an application where very high pressure is required to be developed at moderate discharge?
A. Reciprocating pump
B. Centrifugal pump
C. Turbine
D. None of the above
Right Answer: A. Reciprocating pump
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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 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 vapour absorption refrigeration system is?
A. more noisy than the vapour compression refrigeration system
B. more silent than the vapour compression refrigeration system
C. equally noisy as the vapour compression refrigeration system
D. it depends upon plant capacity
Right Answer: B. more silent than the vapour compression refrigeration system
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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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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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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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Which factors are considered while designing a axial piston pump?
A. use of swash plate
B. application in open loop or closed loop circuit
C. design of bent axis piston pump
D. All of the above
Right Answer: D. All of the above
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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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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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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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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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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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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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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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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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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 passage of uniformly varying cross-section in which the kinetic energy of steam increases at the expense of its pressure is called as?
A. steam turbine
B. steam nozzle
C. steam area
D. all of the above
Right Answer: B. steam nozzle
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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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Which of the following energy conversion devices convert heat into work?
A. Electrical generators
B. I. C engines
C. Condensers
D. All of these
Right Answer: B. I. C engines
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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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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 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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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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The noise level generated by domestic air conditioner ranges between?
A. 38 dB to 70 dB
B. 35 dB to 52 dB
C. 62 dB to 88 dB
D. 50 dB to 60 dB
Right Answer: D. 50 dB to 60 dB
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Energy is not conserved but destroyed in the process. What is the reason behind this?
A. reversibility
B. irreversibility
C. both reversibility and irreversibility
D. none of the above
Right Answer: B. irreversibility
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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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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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In binary vapour cycle, the cycle which is operated in high pressure ratio is called as?
A. bottoming cycle
B. topping cycle
C. upper cycle
D. pressure cycle
Right Answer: B. topping cycle
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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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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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Which of the following quantities has the dimensions [M0 L0 T 0]?
A. Density
B. Starin
C. Stress
D. Strain Rate
Right Answer: B. Strain
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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 construction equipments have highest noise level?
A. Compressors
B. Generators
C. Pneumatic wrenches
D. Pumps
Right Answer: C. Pneumatic wrenches
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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 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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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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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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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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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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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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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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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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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 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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Select the statement which is correct?
A. Standard atmospheric pressure is 1 kg/cm2
B. A barometer reads the difference between load and standard atmospheric pressure
C. Standard atmospheric pressure is the mean local atmospheric pressure at sea level
D. Local atmospheric pressure is always below standard atmospheric pressure
E. Local atmospheric pressure depends upon the elevation of the locality only
Right Answer: Standard atmospheric pressure is the mean local atmospheric pressure at sea level
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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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A mercury water manometer indicates a gauge difference of 400 mm. The difference in pressure, measured in metres of water, is?
A. 0.4
B. 0.8
C. 1088
D. 5.44
E. None of the above
Right Answer: 5.44
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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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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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What is the ratio of amplitude of response to that of the input called?
A. Response
B. Gain
C. Phase
D. Frequency
Right Answer: B. Gain
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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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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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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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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 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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Which of the following is a type of low-torque high-speed motor?
A. radial piston motors
B. axial piston motors
C. bent axis motor
D. gear motor
Right Answer: D. gear motor
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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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The rotation of gears in internal gear pump takes place in?
A. same direction
B. different direction
C. Both a and b
D. None of these
Right Answer: A. same direction
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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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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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In a steady, ideal flow of an incompressible fluid, total energy at any point of the fluid is always constant. This theorem is known as?
A. Euler’s theorem
B. Navier-stockes theorem
C. Reynold’s theorem
D. Bernoulli’s theorem
Right Answer: D. Bernoulli’s theorem
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In which circuits, relay of low voltage and low current is used to make open or close contact?
A. high voltage and high current circuit
B. low voltage and low current circuit
C. high voltage and low current circuit
D. low voltage and low current circuit
Right Answer: A. high voltage and high current circuit
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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 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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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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Which of the following factors increases hardenability of a metal?
A. Alloying elements
B. Fine grain size
C. Very high carbon content in steel
D. All of the above
Right Answer: A. Alloying elements
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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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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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The hydrostatic law states that rate of increase of pressure in a vertical direction is equal to?
A. Density of the fluid
B. Specific weight of the fluid
C. Weight of the fluid
D. None of the above
Right Answer: Specific weight of the fluid
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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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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 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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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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At the maximum inversion temperature in the graph of isenthalpic or joule-kelvin expansion of a gas, the value of Joule-Kelvin coefficient is?
A. negative
B. positive
C. zero
D. positive, negative or zero depends upon initial temperature
Right Answer: C. zero
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How is the incident radiation absorbed by a gas layer?
A. A gas layer absorbs incident radiation slowly
B. A gas layer absorbs incident radiation rapidly
C. doesn’t matter
D. unpredictable
Right Answer: A. A gas layer absorbs incident radiation slowly
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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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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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Scientific management is a systematic approach to manage the enterprise on the basis of?
A. observation
B. experimentation
C. rational decisions
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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What is the critical thickness of insulation for hollow cylinder?
A. a thickness of insulation at which heat transfer rate from cylinder is minimum
B. a thickness of insulation at which heat transfer rate from cylinder is maximum
C. a thickness of insulation at which heat transfer from cylinder does not change with change in outside temperature
D. none of the above
Right Answer: B. a thickness of insulation at which heat transfer rate from cylinder is maximum
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If a barometer carries wter instead of mercury, the height of column for a pressure equivalent to 75 cm of mercury will be?
A. 1020 cm
B. 1000 cm
C. 1034 cm
D. 1040 cm
E. 1050 cm
Right Answer: 1020 cm
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Energy stored in a body within an elastic limit is called as?
A. resilience
B. strain energy
C. Both a and b
D. None of the above
Right Answer: C. Both a and b
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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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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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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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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 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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An ideal flow of any liquid must fulfil?
A. Newton’s second law of motion
B. Bernulli’s theorem
C. The Newton’s law of viscosity
D. Law of conservation of energy
E. Countinuity equation
Right Answer: Countinuity equation
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What is the effect of increasing flow coefficient (Φ) in an axial flow compressor on blade loading coefficient (Ψ)?
A. Blade loading coefficient (Ψ) increases
B. Blade loading coefficient (Ψ) decreases
C. Blade loading coefficient (Ψ) remains constant
D. Unpredictable
Right Answer: B. Blade loading coefficient (Ψ) decreases
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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 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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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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