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
Which of the following operations is/are performed on a lathe machine?
A. Spot-facing
B. Parting
C. Reaming
D. All of the above
Right Answer: B. Parting
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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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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 of the following methods can be used to reduce excitation level at the source?
A. Lubrication of joints
B. Balancing inertia forces
C. Both a and b
D. None of the above
Right Answer: C. Both a and b
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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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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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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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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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An ideal fluid is?
A. Similar to a perfect gas
B. Frictionless and incompressible
C. One which obeys Newton’s law of viscosity
D. One which satisfies continuity equation
E. One which flows through pipes with least friction
Right Answer: Frictionless and incompressible
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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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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 sum of components of shear forces in the direction of flow of fluid is called as?
A. shear drag
B. friction drag
C. skin drag
D. all of the above
Right Answer: D. all of the above
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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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2
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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 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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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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1
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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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1
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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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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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What is the correct formula for the total emissive power of the gray body (Eg)?
A. (Eg) = ε σ T4
B. (Eg) = ε T4
C. (Eg) = (1/ε) σ T4
D. none of the above
Right Answer: (Eg) = ε σ T4
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Which 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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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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Mechanical working processes are performed on metals?
A. to achieve optimum mechanical properties in the metal
B. to improve the mechanical strength of the metal
C. to make metal dense
D. all of the above
Right Answer: D. all of the above
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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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Absolute pressure is measured as?
A. Gauge pressure – Atmospheric pressure
B. Gauge pressure + Atmospheric pressure
C. Gauge pressure / Atmospheric pressure
D. none of the above
Right Answer: B. Gauge pressure + Atmospheric pressure
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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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Solid length for helical compression springs having square and ground ends is given as?
A. (n + 2)d
B. (n + 3)d
C. (n + 1)d
D. None of the above
Right Answer: A. (n + 2)d
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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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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 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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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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0
1
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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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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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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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0
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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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1
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Which of the following vibrometers have frequency ratio (ω/ωn) << 1?
A. Accelerometers
B. Velometers
C. Both a and b
D. None of the above
Right Answer: A. Accelerometers
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0
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Froude number is useful in calculations for?
A. Water hammer
B. Flow through pipes
C. Hydraulic jump
D. Surface tension force
E. Compressible flow problems
Right Answer: Hydraulic jump
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0
1
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Four piezometer openings in the same cross-section of a cast iron pipe indicate the following pressure for simultaneous reading: 43, 42.6, 42.4 37 mm Hg. What value should be taken for the pressure?
A. 41.5
B. 43
C. 37
D. 42.67
E. None of the above
Right Answer: 42.67
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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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Secondary force in reciprocating engine mechanism is caused due to?
A. S.H.M. of reciprocating parts
B. oscillation of reciprocating parts
C. obliquity of arrangement of reciprocating parts
D. all of the above
Right Answer: C. obliquity of arrangement of reciprocating parts
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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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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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How is the arrangement of pistons in piston pumps?
A. axially
B. radially
C. Both a and b
D. None of the above
Right Answer: C. Both a and b
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When the angle between surface tension with the liquid (θ) is greater than 90o, the liquid becomes?
A. flat
B. concave upward
C. convex upward
D. unpredictable
Right Answer: C. convex upward
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The resultant hydrostatic force acts through a point known as?
A. Centre of gravity
B. Centre of buoyancy
C. Centre of Pressure
D. None of the above
Right Answer: Centre of Pressure
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When a venturimeter is used in an inclined position, it will show?
A. Sale reading
B. More reading
C. Less reading
D. Depends on vescosity of fluid
E. None of the above
Right Answer:Sale reading
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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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1
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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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Magnitude of eddy viscosity for laminar flow is?
A. Less than zero
B. Zero
C. Greater than zero
D. Unpredictable
Right Answer: B. Zero
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1
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Head loss hf due to friction is given by?
A. 4 ƒ l v2 / g d
B. 4 f2 l ν / 2 g d
C. 2 ƒ l v 2 / 2 g d
D. 4 ƒ l v2 / 2 g d
Right Answer: D. 4 ƒ l v2 / 2 g d
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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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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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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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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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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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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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The ratio of actual whirl velocity to the ideal whirl velocity in the centrifugal compressor is called as?
A. velocity factor
B. slip factor
C. work factor
D. None of the above
Right Answer: B. slip factor
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Waterfall method is observed in?
A. product design and development
B. quality circle
C. brain storming
D. flow chart
Right Answer: A. product design and development
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A closed feedwater heater system?
A. has high heat transfer capacity
B. requires pump at each heater to handle the large feedwater stream
C. requires only single pump regardless of the number of heaters
D. does not require any pump as the extracted steam and feedwater are not allowed to mix
Right Answer: C. requires only single pump regardless of the number of heaters
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1
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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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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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1
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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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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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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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1
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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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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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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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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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Which of the following is an example of constant mass manufacturing process?
A. Rolling
B. Turning
C. Broaching
D. Sawing
Right Answer: A. Rolling
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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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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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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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1
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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 component of fluid velocity is responsible for transmission of power through rotodynamic machine?
A. Radial
B. Axial
C. Tangential
D. None of the above
Right Answer: D. Tangential
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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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Which method is used for stability analysis?
A. Nyquisit criteria
B. Root locus method
C. Routh Hurwitz criteria
D. All of the above
Right Answer: D. All of the above
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Which of the following systems generate more energy when used in industrial applications?
A. hydraulic systems
B. pneumatic systems
C. both systems generate same energy
D. cannot say
Right Answer: A. hydraulic systems
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1
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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 of the following is tested for parallelism between trajectory and a plane?
A. plane is on a component which moves
B. plane is on a component which does not moves
C. Both a and b
D. None of the above
Right Answer: C. Both a and b
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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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0
1
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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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Torsional pendulum is used to determine mass moment of inertia of?
A. Fly wheel
B. Riding bar
C. Both a and b
D. None of the above
Right Answer: A. Fly wheel
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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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0
1
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What is the ratio of maximum velocity to average velocity, when the fluid is passing through two parallel plates and flow is laminar?
A. 3/2
B. 2/3
C. 4/3
D. 3/4
Right Answer: D. 3/4
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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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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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According to Taylor’s principle which type of gauge checks both size and geometric features?
A. Go gauge
B. No go gauge
C. Both a and b
D. None of the above
Right Answer: A. Go gauge
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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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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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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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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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Determine logarithmic decrement, if the amplitude of a vibrating body reduces to 1/6th in two cycles.
A. 0.223
B. 0.8958
C. 0.3890
D. None of the above
Right Answer: B. 0.8958
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The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at the point, is called as?
A. path line
B. streak line
C. filament line
D. stream line
Right Answer: D. stream line
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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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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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A hydro-electric site has a head of 100 m and an average discharge of 10m3/s. Assume 92% efficiency, for a greater speed of 6000 rpm, the specific speed of turbine would be?
A. 600
B. 1000
C. 1500
D. 1900
E. None of the above
Right Answer: 600
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What is the product of sectional modulus and allowable bending stress called as?
A. Moment of inertia
B. Moment of rigidity
C. Moment of resistance
D. Radius of gyration
Right Answer: C. Moment of resistance
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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 is the ratio of the actual work absorbed by an axial flow compressor to the theoretical work called?
A. Work input factor
B. Workdone factor
C. Both a and b
D. None of the above
Right Answer: C. Both a and b
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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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