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
Calculate the cutting speed of drilling operation when diameter of drill is 10 mm and rotational speed of drill is 200 r.p.m.?
A. 6.283 m/min
B. 3.142 m/min
C. 8.362 m/min
D. 10.216 m/min
Right Answer: A. 6.283 m/min
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Vaneless diffusers are suitable for?
A. only low pressure rise
B. only high pressure rise
C. both low as well as high pressure rise
D. None of the above
Right Answer: A. only low pressure rise
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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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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 NOT a type of heat exchanger?
A. Recuperator
B. Regenerator
C. Mixer
D. none of the above
Right Answer: D. none of the above
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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 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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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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Which of the following is a property of bulk load?
A. Hardness
B. Cake forming tendency
C. Suspension part
D. Weight
Right Answer: B. Cake forming tendency
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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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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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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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Which of the following ergonomic factors are encountered in engineering applications?
A. Thermal radiations
B. Lubrication failure
C. Fatigue
D. Corrosion
Right Answer: C. Fatigue
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Low-torque high-speed motors are used in?
A. cranes
B. fans
C. winches
D. all of the above
Right Answer: B. fans
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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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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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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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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 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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Heat pump is used ?
A. to transform low grade rejected heat into high temperature heat source
B. to transform high grade rejected heat into low temperature heat sink
C. Both a and b
D. None of the above
Right Answer: B. to transform high grade rejected heat into low temperature heat sink
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The layer above the laminar sublayer with some turbulence and still having importance of viscous action is called as?
A. sub-sublayer
B. turbulent layer
C. buffer layer
D. none of the above
Right Answer: C. buffer layer
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Which of the following is not a part of carriage of the centre lathe?
A. Tool post
B. Apron
C. Compound rest
D. Gear box controls
Right Answer: D. Gear box controls
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The surface of the single point cutting tool on which the chips formed in cutting operation slide is called as?
A. flank
B. heel
C. face
D. shank
Right Answer: C. face
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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
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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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To predict failure in design components which failure criteria is not assumed, when mean stress and stress amplitude are nonzero?
A. Goodman criterion
B. Soderberg criteria
C. Gerber criteria
D. None of the above
Right Answer: D. None of the above
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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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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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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 an ideal fluid?
A. A fluid which has no viscosity
B. A fluid which is incompressible
C. A fluid which has no surface tension
D. All of the above
Right Answer: D. All of the above
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Which of the following errors are also known as cumulative errors?
A. Random errors
B. Systematic errors
C. Gross errors
D. System interaction errors
Right Answer: B. Systematic errors
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The 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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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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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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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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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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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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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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Which type of earplugs contain silicon rubber and a fixing agent?
A. Semi insert protectors
B. Custom moulded earplugs
C. Pre-fabricated earplugs
D. Canal caps
Right Answer: B. Custom moulded earplugs
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Which among the following is the fundamental equation of S.H.M.?
A. x + (k / m) x =0
B. x + ω2x =0
C. x + (k/ m)2 x =0
D. x2 + ωx2 =0
Right Answer: D. x2 + ωx2 =0
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The process of lowering the temperature of a liquid below its freezing point is known as?
A. supercooling
B. undercooling
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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The radiation heat exchange between two bodies depends upon?
A. the views of two surfaces with each other
B. the medium between the two bodies
C. emitting and absorbing characteristics of the bodies
D. all of the above
Right Answer: D. all of the above
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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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Several machine tools can be controlled by a central computer in?
A. NC (Numerical Control) machine tool
B. CNC (Computer Numerical Control) machine tool
C. DNC (Direct Numerical Control) machine tool
D. CCNC (Central-Computer Numerical Control) machine tool
Right Answer: C. DNC (Direct Numerical Control) machine tool
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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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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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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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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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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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Select the quantity in the following that is not a dimensionless parameter?
A. Pressure coefficient
B. Froude number
C. Darcy weisbach friction factor
D. Kinematic viscosity
E. Weber number
Right Answer: Kinematic viscosity
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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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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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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 material which holds the fine grains of abrasive material in grinding wheel is called as?
A. Compound
B. Bond
C. Hold
D. None of the above
Right Answer: B. Bond
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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 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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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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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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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 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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Hardness of a material enables it to resist?
A. abrasion
B. penetration
C. plastic deformation
D. all of the above
Right Answer: D. All of the above
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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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What is the pH value of water permissible for boiler?
A. 0
B. 7
C. slightly less than 7
D. slightly more than 7
Right Answer: D. slightly more than 7
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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 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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When two vapor cycles are coupled in series and heat rejected by one is absorbed by another, the cycle is called as?
A. Dual vapour cycle
B. Binary vapour cycle
C. Coupled vapour cycle
D. none of the above
Right Answer: B. Binary vapour cycle
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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 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 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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PMM2 is the machine which violates?
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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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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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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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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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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What is the reason for using unconventional or advanced machining processes?
A. Complex surfaces
B. High accuracy and surface finish
C. High strength alloys
D. All of the above
Right Answer: D. All of the above
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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 is a hydraulic cylinder based on application?
A. welded
B. bolted
C. ram
D. all of the above
Right Answer: C. ram
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In which power transmitting drive polygon effect is observed?
A. Belt drive
B. Chain drive
C. Both a and b
D. None of these
Right Answer: B. Chain drive
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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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Friction factor for laminar flow is given by?
A. (Re /64)
B. (64 / Re)
C. (Re / 16)
D. (16 / Re)
Right Answer: B. (64 / Re)
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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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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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A simple pitot tube is used to measure?
A. The pressure in a static fluid
B. The velocity in a flowing stream
C. The total pressure
D. The dynamic pressure
E. The undistributed fluid pressure
Right Answer: The velocity in a flowing stream
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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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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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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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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 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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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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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
Total 1 Votes:
0
1
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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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The ability of the moulding sand to withstand the heat of melt without showing any sign of softening is called as?
A. strength or cohesiveness
B. refractiveness
C. collapsibility
D. adhesiveness
Right Answer: B. refractiveness
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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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1
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In which type of turbine, the runner needs to be run full of water?
A. Impulse turbine
B. Reaction turbine
C. Both a and b
D. None of the above
Right Answer: B. Reaction turbine
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1
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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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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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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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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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