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
Rankine-Gordon’s empirical formula is applicable for?
A. long column
B. short column
C. Both a and b
D. All of these
Right Answer: C. Both a and b
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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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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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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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What is quality assurance?
A. Quality assurance deals with activities which prove that products and services meet the required quality standard
B. Quality assurance deals with activities which aim at customers satisfaction
C. Quality assurance deals with controlling the quality of products by inspection
D. All of the above
Right Answer: A. Quality assurance deals with activities which prove that products and services meet the required quality standard
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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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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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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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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 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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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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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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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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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 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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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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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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If a relief valve has reliability of 0.989, how many failures are expected in testing 1000 such relief valves?
A. 111
B. 100
C. 10
D. 11
Right Answer: D. 11
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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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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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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 amount of heat transferred to convert unit mass of solid to vapour or vice versa is called as?
A. latent heat of vaporization
B. latent heat of fusion
C. latent heat of sublimation
D. specific heat
Right Answer: C. latent heat of sublimation
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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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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 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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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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The PLC is used in?
A. machine tools
B. automated assembly equipment
C. moulding and extrusion machines
D. all of the above
Right Answer: D. all of the above
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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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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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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 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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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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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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An isobaric process, has constant?
A. Density
B. Pressure
C. Temperature
D. Volume
Right Answer: B. Pressure
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1 atm pressure is equivalent to?
A. 1.01315 x 105 N/m2
B. 700 mm Hg
C. 1.0133 x 105 kg/m-sec2
D. 1.0133 x 106 kg/cm-sec2
E. Any of the above
Right Answer: Any of the above
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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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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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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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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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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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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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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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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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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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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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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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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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The reheat cycle allows steam power plant?
A. to use higher pressure ratio
B. to maintain required quality of steam at the exit of the turbine
C. to increase the turbine work
D. all of the above
Right Answer: D. all of the above
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The 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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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 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 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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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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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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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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Which of the following assumptions are made in torsion theory?
A. Shaft is perfectly straight
B. Material of the shaft is heterogeneous
C. Twist cannot be uniform along the length of the shaft
D. All of the above
Right Answer: A. Shaft is perfectly straight
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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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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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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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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 primary function of mechanism?
A. Power transmission
B. Power absorption
C. Force transmission
D. Motion transmission
Right Answer: D. Motion transmission
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Large sized and heavy shell-and-tube heat exchangers are suitable for?
A. automotive applications
B. aircraft applications
C. marine applications
D. none of the above
Right Answer: D. none of the above
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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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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 thermometric property in the Kelvin scale is?
A. Temperature (T)
B. Work energy (W)
C. Heat energy (Q)
D. all of the above
Right Answer: C. Heat energy (Q)
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What is a free-shaft turbine?
A. the separate turbine which is used only to run compressor
B. the separate turbine which is placed on another shaft on which the compressor is not run
C. the separate turbine which is used only to run condenser
D. all of the above
Right Answer: B. the separate turbine which is placed on another shaft on which the compressor is not run
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The 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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Which type of chips form while machining of brittle materials?
A. continuous chipsq
B. discontinuous chips
C. Built-up chips
D. all of the above with some proportion
Right Answer: B. discontinuous chips
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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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Which flat belt drive system has two pulleys mounted on driven shaft and one pulley on driving shaft?
A. Multiple belt drive
B. Cone pulley drive
C. Fast and loose pulley drive
D. None of the above
Right Answer: C. Fast and loose pulley drive
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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 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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Which material cannot be used to manufacture shafts?
A. Plain carbon steels
B. Cast iron
C. Both a and b
D. None of the above
Right Answer: B. Cast iron
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The 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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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 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 welding process by Metal Inert-Gas (MIG) welding is?
A. slower than the welding process by Tungsten Inert-Gas (TIG) welding
B. faster than the welding process by Tungsten Inert-Gas (TIG) welding
C. at same speed as the welding process by Tungsten Inert-Gas (TIG) welding
D. at unpredictable speed
Right Answer: B. faster than the welding process by Tungsten Inert-Gas (TIG) welding
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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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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 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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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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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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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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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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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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Shear stress energy theory is called as?
A. distortion theory
B. Von Mises theory
C. Both a and b
D. None of the above
Right Answer: C. Both a and b
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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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Rotary displacement pumps are suitable for handling?
A. oils
B. gritty liquids
C. both oils as well as gritty liquids
D. None of the above
Right Answer: A. oils
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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 formula is used to calculate mass moment of inertia (IG) of a circular rim about the axis through centre of gravity?
A. mr2/2
B. mr2/12
C. mr2/4
D. mr2
Right Answer: D. mr2
Total 1 Votes:
0
1
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Which of the following can be considered as more compact efficient heat exchanger?
A. Car radiators
B. Stirling engine regenerator
C. Ceramic regenerator in gas turbine
D. none of the above
Right Answer: B. Stirling engine regenerator
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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
Total 1 Votes:
0
1
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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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Which of the following is α – β brass?
A. Admiralty brass
B. Brazing brass
C. Cartridge brass
D. All of the above
Right Answer: B. Brazing brass
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0
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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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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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Why are shear connectors used?
A. Interconnect planks
B. To avoid sliding between planks
C. Both a and b
D. None of the above
Right Answer: C. Both a and b
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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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0
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Which of the following is an example of constant mass manufacturing process?
A. Rolling
B. Turning
C. Broaching
D. Sawing
Right Answer: A. Rolling
Total 1 Votes:
1
0
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In an isolated system, ________ can be transferred between the system and its surrounding.
A. Only enrgy
B. Only mass
C. Both energy and mass
D. Neither energy and mass
Right Answer: D. Neither energy and mass
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