Engineering Mechanics Multiple Choice Questions And Answers for download free pdf

10.1. The unit of force in S.I. units is
(a) kilogram
(b) newton
(c) watt
(d) dyne
(e) joule.

Ans: b

10.2. The unit of work or energy in S.I. units is
(a) newton
(b) pascal
(c) kilogram metre
(d) watt
(e) joule.

Ans: e

10.3. The unit of power in S.I. units is
(a) newton metre
(b) watt
(c) joule
(d) kilogram metre/sec.
(e) pascal per sec.

Ans: b

10.4. Forces are called concurrent when their lines of action meet in
(a) one point      
(b) two points
(c) plane
(d) perpendicular planes
(e) different planes.
Ans: a

10.5. Forces are called coplanar when all of them acting on body lie in
(a) one point      
(b) one plane
(c) different planes
(d) perpendicular planes
(e) different points.
Ans: b

10.6. A force acting on a body may
(a) introduce internal stresses
(b) balance the other forces acting on it
(c) retard its motion
(d) change its motion
(e) all of the above.
Ans: e

10.7. Which is the correct statement about law of polygon of forces ?
(a) if any number of forces acting at a point can be represented by the sides
of a polygon taken in order, then the forces are in equilibrium
(b) if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equi¬librium
(c) if a polygon representing forces acting at a point is closed then forces are in equilibrium
(d) if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium
(e) none of the above.
Ans: d

10.8. Effect of a force on a body depends upon
(a) magnitude
(b) direction
(c) position or line of action
(d) all of the above
(e) none of the above.
Ans: d

10.9. If a number of forces act simultaneously on
a particle, it is possible
(a) not a replace them by a single force
(b) to replace them by a single force
(c) to replace them by a single force through C.G.
(d) to replace them by a couple
(e) to replace them by a couple and a force.
Ans: b

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Hydraulic and Fluid Machines Multiple Choice Questions and Answers for freshers

8.1. Fluid is a substance that
(a) cannot be subjected to shear forces
(b) always expands until it fills any con-tainer
(c) has the same shear stress.at a point regardless of its motion
(d) cannot remain at rest under action of any shear force
(e) flows.

Ans: d

8.2. Fluid is a substance which offers no resistance to change of
(a) pressure
(b) flow
(c) shape
(d) volume
(e) temperature.

Ans: c

8.3. Practical fluids
(a) are viscous
(b) possess surface tension
(c) are compressible
(d) possess all the above properties
(e) possess none of the above properties.

Ans: d

8.4. In a static fluid
(a) resistance to shear stress is small
(b) fluid pressure is zero
(c) linear deformation is small
(d) only normal stresses can exist
(e) viscosity is nil.

Ans: d

8.5.     A fluid is said to be ideal, if it is
(a) incompressible
(b) inviscous
(c) viscous and incompressible
(d) inviscous and compressible
(e) inviscous and incompressible.
Ans: e

8.6.     An ideal flow of any fluid must fulfill the following
(a) Newton's law of motion
(b) Newton's law of viscosity
(c) Pascal' law
(d) Continuity equation
(e) Boundary layer theory.
Ans: d

8.7. If no resistance is encountered by displacement, such a substance is known as
(a) fluid
(b) water
(c) gas
(d) perfect solid
(e) ideal fluid.
Ans: e

8.8. The volumetric change of the fluid caused by a resistance is known as
(a) volumetric strain
(b) volumetric index
(c) compressibility
(d) adhesion
(e) cohesion.
Ans: c

8.9. Liquids
(a) cannot be compressed
(b) occupy definite volume
(c) are not affected by change in pressure and temperature
(GO are not viscous
(e) none of the above.
Ans: e

8.10. Density of water is maximum at
(a) 0°C
(b) 0°K
(c) 4°C
(d) 100°C
(e) 20°C.
Ans: c

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Engineering Materials - Mechanical Engineering Multiple Choice Questions and Answers for Competitive exams

1.    Ductility of a material can be defined as
(a)    ability to undergo large permanent deformations in compression
(b)    ability to recover its original form
(c)    ability to undergo large permanent deformations in tension
(d)    all of the above
(e)    none of the above.

Ans: c

2.    Malleability of a material can be defined as
(a)    ability to undergo large  permanent deformations in compression
(b)    ability to recover its original form
(c)    ability to  undergo large permanent deformations in tension
(d)    all of the above
(e)    none of the above.

Ans: a

3.    In compression, a prism of brittle material will break
(a)     by forming a bulge (l>) by shearing along oblique plane
(c)    in direction perpend cular to application of load
(d)    by crushing into thousands of pieces
(e)    none of the above.

Ans: b

4.    The ability of a material to resist softening at high temperature is known as
(a) creep   
(b) hot tempering
(c) hot hardness  
(d) fatigue
(e) super hardening.

Ans: c

5. Mild steel belongs  to the following category
(a)    low carbon steel
(b)     medium carbon steel
(c)    high carbon steel
(d)    alloy steel
(e)     special steel.
Ans: a

6.    The ultimate tensile strength of low carbon steel by working at a high strain rate will
(a)    decrease
(b)    increase
(c)    remain constant
(d)    first increase and then decrease
(e)    first decrease and then increase.
Ans: b

7.    Slow plastic defoliation of metals under a constant stress is known as
(a)    creep
(b)    fatigue
(c)    endurance
(d)    plastic deformation
(e)    non-plastic deformation.
Ans: a

8.    The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to l00°C will
(a)     increase   
(b)     decrease
(c)    remain same
(d)    first increase and then decrease
(e)    show unpredictable behavior.
Ans: a

9.    The number of electrons in 1 cm3 of metal would be of the order of
(a) 1010   
(b)TO16
(c) 1022   
(d) 1040
(e) 1052
Ans: c

10.    Stress relaxation is- the phenomenon
(a)    in which parts are not loaded
(b)    in which stress remains constant on increasing load
(c)    in which deformation tends to loosen the joint and produces a stress reduced
(d)    stress reduces on increasing load
(e)    none of the above.
Ans: c

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Machine Design - Mechanical Engineering Multiple Choice Questions and Answers for Compitations exams

1.    The ultimate strength of steel in tension in comparison to shear is in the ratio of
(a) 1 : l   
(b) 2:1
(c) 3 : 2   
(d) 2 : 3
(e) 1 : 2

Ans: c

2.    The pci Tnissible stress for carbon steel under static loading is generally taken as
(a)    2000-3000 kg/pm2
(b)    3000-4000 kg/cm2
(c)    4000-J500 kg/cm2
(d)    7500-10,000 kg/cm2
(e)    10,000-15,000 kg/cm2.

Ans: c

3.    The property of a material which enables it to resist fracture due to high impact loads is known as
(a) elasticity   
(b) endurance
(c) strength   
(d) toughness
(e) resilience.

Ans: d

4.    A hot short metal is
(a)    brittle when cold
(b)    brittle when hot
(c)    brittle under all conditions
(d)    ductile at high temperature
(e)    hard when hot.

Ans: b

5.    Guest's theory of failure is applicable for following type of materials
(a) brittle   
(b) ductile
(c) elastic   
(d) plastic
(e) tough.
Ans: b

6.    Rankine's theory of failure is applicable for following type of materials
(a) brittle   
(b) ductile
(c) elastic   
(d) plastic
(e) tough.
Ans: a

7.    If an unsupported uniform cross sectional elastic bar is subjected to a longitudinal impact from a rigid bob moving with velocity v, then a compressive wave of intensity sc is propagated through the bar as follows
(a) vpE   
(b) vVvF
(c) WpE/2   
(d) IvHpE
(e) none of the above, where E = modulus of elasticity and p = mass density.
Ans: a

8.    Tensile strength of a mild steel specimen can be roughly predicted from following hardness test
(a)     Brinell   
(b)     Rockwell
(c)    Vicker
(d)    Shore's sceleroscope
(e)    none of the above.
 Ans: a

9.    Resilience of a material is important, when it is subjected to
(a)    combined loading
(b)    fatigue   
(c)     thermal stresses
(d)     wear and tear
(e)     shock loading.
Ans: e

10.    In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by
(a)    decreasing  the cross-section area of' bar
(b)    increasing the cross-section area of bar
(c)    remain unaffected with cross-section area
(d)    would depend upon other factors
(e)    none of the above.
Ans: a

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Steam Boilers, Engines, Nozzles and Turbines - Mechanical Engineering Multiple choice questions and Answers for Compitative exams

1.    For water, at pressures below atmospheric,
(a)    melting point rises slightly and boiling point drops markedly
(b)    melting point rises markedly and boiling point drops markedly
(c)    melting point drops slightly and boiling point drops markedly
(d)    melting point drops slightly and boiling point drops slightly
(e)    none of the above.

Ans: a

2.    At very low temperature, the melting and boiling temperatures become equal. This temperature is
(a) 373°K   
(b) 273.16°K
(c) 303°K   
(d) 0°K.
(e) 300°K.

Ans: b

3.    The critical pressure at which latent heat of vaporization is zero is
(a)    225.65 kgf/cm2
(b)    273 kgf/cm2    
(c)     100 kgf/cm2
(d)    1 kgf/cm2   
(e)   - 1 kgf/cm2.

Ans: a

4.    The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is
(a)     less   
(b)     more
(c)    equal
(d)    may be less or more depending on temperature
(e)    unpredictable.
Ans: a

5.    The saturation temperature of steam with increase in pressure increases
(a)    linearly
(b)    rapidly first and then slowly
(c)    slowly first and then rapidly
(d)    inversely
(e)     none of the above.
Ans: b

6.    Carbonisation of coal is the process of
(a)    pulverising coal in inert atmosphere
(b)    heating wood in a limited supply of air at temperatures below 300°C
(c)    strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
(d)    binding the pulverised coal into brickettes
(e)    enriching carbon in the coal.
Ans: c

7.    Coke is produced by
(a)    pulverising coal in inert atmosphere
(b)    heating wood in a limited supply of air at temperatures below 300GC
(c)    strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
(d)    binding the pulverised coal into bricketts
(e)    enriching carbon in the coal.
Ans: c

8.    Heating of dry steam above saturation temperature is known as
(a) enthalpy   
(b) superheating
(c) supersaturation
(d) latent heat
(e) super tempering.
Ans: b

9.    Superheating of steam is done at
(a)    constant volume
(b)    constant temperature
(c)    constant pressure
(d)    constant entropy
(e)    constant enthaply.
Ans: c

10.    1 kg.m is equal to
(a) 9.81 Joules      
(b) All Joules
(c) 427 Joules       
(d) 102 Joules
(e) 539 Joules.
Ans: a

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Nuclear Power Plants - Mechanical Engineering Multiple Choice Questions and Answers for Compitative exams

1.    The efficiency of a nuclear power plant in comparison to a conventional thermal power plant is
(a)     same   
(b)     more
(c)    less
(d)    may be less or mote depending on size
(e)    unpredictable.

Ans: c

2.    Isotopes of same elements have
(a)    same atomic number and different masses
(b)    same chemical properties but different atomic numbers
(c)    different masses and different atomic numbers
(d)    different chemical properties and same atomic numbers
(e)    same  chemical  properties and same atomic numbers.

Ans: b

3.    Atomic number of an element in the periodic table represents the numbers of
(a)    protons in the nucleus
(b)    electrons in me nucleus
(c)    neutrons in the nucleus
(d)    electrons in the atom
(e)    neutrons in the atom.

Ans: a

4.    The mass number of a substance represents the sum of total number of
(a)    protons and neutrons in an atom
(b)    protons and electrons in an atom
(c)    neutrons and electrons in an atom
(d)    protons and neutrons in a nucleus
(e)    protons and electrons in a nucleus.
Ans: d

5.    Which is not identical for an atom and an isotope
(a) mass number   
(b) atomic number
(c) chemical properties
(d) position in periodic table
(e) all of the above.
Ans: a

6.    Amongst the following, the fissionable materials are
(a) U233andPu239
(b) U23iandPu233
(c) U235andPu235
(d) U238andPu239
(e) U243andPu235
Ans: a

6.    A nuclear unit becoming critical means
(a)    it is generating power to rated capacity
(b)    it is capable of generating much more than rated capacity
(c)    there is danger of nuclear spread
(d)     chain reaction that causes automatic splitting of the fuel nuclei has been established
(e)     it generates no heat.
Ans: d

7.    Moderator in nuclear plants is used to
(a)    reduce temperature
(b)    extract heat from nuclear reaction
(c)    control the reaction
(d)    cause collision with the fast moving neutrons to reduce their speed
(e)    moderate the radioactive pollution.
Ans: d

8.    The most commonly used moderator in nuclear plants is
(a)    heavy water
(b)    concrete and bricks
(c)    graphite and concrete
(d)    deuterium   
(e)     graphite.
Ans: e

9.    The nuclear energy is measured as
(a) MeV   
(b) curie
(c) farads   
(d) MW
(e) kWhr.
Ans: a

10.    The total energy released in fission of U is
(a) 5 MeV   
(b) 10 MeV
(c) 199 MeV   
(d) 168 MeV
(e) 11 MeV.
Ans: c

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Thermodynamics - Mechanical Engineering Multiple Choice Questions and Answers for Compitative exams

1.    Which of the following variables controls the physical properties of a perfect gas
(a) pressure
(b) temperature
(c) volume   
(d) all of the above
(e) atomic mass.

Ans: d

2.    Which qf the following laws is applicable for the behavior of a perfect gas
(a) Boyle's law     
(b) Charles'law
(c) Gay-Lussac law
(d) all of the above
(e) Joule's law.

Ans: d

3.    The unit of temperature in S.I. units is
(a) Centigrade      
(b) Celsius
(c) Fahrenheit       
(d) Kelvin
(e) Rankine.
Ans: d

4.    The unit of mass in S.I. units is
(a) kilogram   
(b) gram
(c) tonne                
(d) quintal
(e) newton.
Ans: a

5.    The unit of time in S.I. units is
(a) second   
(b) minute
(c) hour                
(d) day
(e) year.
Ans: a

6.    The unit of length in S.I. units is
(a) meter   
(b) centimeter
(c) kilometer        
(d) millimeter.
Ans: a

7.    The unit of energy in S.I. units is
(a) watt   
(b) joule
(c) joule/s   
(d) joule/m
(e) joule m.
Ans: b

8.    According to GayLussac law for a perfect gas, the absolute pressure of given mass varies directly as
(a)     temperature     
(b)     absolute
(c)    absolute temperature, if volume is kept constant
(d)    volume, if temperature is kept constant
(e)    remains constant,if volume and temperature are kept constant.
Ans: c

9.    An ideal gas as compared to a real gas at very high pressure occupies
(a)     more volume   
(b)     less volume
(c)    same volume
(d)    unpredictable behavior
(e)    no such correlation.
Ans: a

10.    General gas equation is
(a) PV=nRT       
(b) PV=mRT
(d) PV = C
(c) PV=KiRT
(e) Cp-Cv = Wj
Ans: b

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