HYDRAULIC MACHINES - Mechanical Engineering Multiple choice Questions Answers

HYDRAULIC MACHINES

Mechanical Engineering Multiple choice Questions Answers

“HYDRAULIC MACHINES”

Mechanical Engineering MCQS

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HYDRAULIC MACHINES Questions Answers

1. Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of
   (a) high initial and maintenance cost
   (b) lower discharge
   (c) lower speed of operation
   (d) necessity of air vessel
   (e) all of the above.
   Ans: a


2. In a centrifugal pump casing, the flow of water leaving the impeller, is
   (a) rectilinear flow
   (b) radial flow
   (c) free vortex motion
   (d) forced vortex
   (e) none of the above.
   Ans: c


3. Head developed by a centrifugal pump depends on
   (a) impeller diameter
   (b) speed
   (c) fluid density
   (d) type of casing
   (e) (a) and (b) above.
   Ans: e


4. For starting an axial flow pump, its delivery valve should be
   (a) closed
   (b) open
   (c) depends on starting condition and flow desired
   (d) could be either open or closed
   (e) partly open and partly closed.
   Ans: b


5. The efficiency of a centrifugal pump is maximum when its blades are
   (a) straight
   (b) bent forward
   (c) bent backward
   (d) bent forward first and then backward
   (e) bent backward first and then forward.
   Ans: c

 

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HEAT TRANSFER - Mechanical Engineering Multiple choice Questions Answers

HEAT TRANSFER

Mechanical Engineering Multiple choice Questions Answers

“HEAT TRANSFER”

Mechanical Engineering MCQS

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HEAT TRANSFER Questions Answers

 

1. Unit of thermal conductivity in M.K.S. units is
(a) kcal/kg m2 °C
(b) kcal-m/hr m2 °C
(c) kcal/hr m2 °C
(d) kcal-m/hr °C
(e) kcal-m/m2 °C.
Ans: b

2. Unit of thermal conductivity in S.I. units is
(a) J/m2 sec
(b) J/m °K sec
(c) W/m °K
(d) (a) and (c) above
(e) (b) and (c) above.
Ans: e

3. Thermal conductivity of solid metals with rise in temperature normally
(a) increases
(b) decreases
(c) remains constant
(d) may increase or decrease depending on temperature
(e) unpredictable.
Ans: b

4. Thermal conductivity of non-metallic amorphous solids with decrease in temperature
(a) increases
(b) decreases
(c) remains constant
(d) may increase or decrease depending on temperature
(e) unpredictable.
Ans: b

5. Heat transfer takes place as per –
(a) zeroth law of thermodynamics
(b) first law of thermodynamic
(c) second law of the thermodynamics
(d) Kirchoff’s law (e) Stefan’s law.
Ans: c

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120. A grey body is one whose absorptivity
(a) varies with temperature
(b) varies with the wave length of incident ray
(c) varies with both
(d) does not vary with temperature and wave length of the incident ray
(e) there is no such criterion.
Ans: d

 

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FLUID MECHANICS - Mechanical Engineering Multiple choice Questions Answers

fluid mechanics objective type questions and answers pdf 

FLUID MECHANICS

Mechanical Engineering Multiple choice Questions Answers

fluid mechanics objective questions

fluid mechanics mcq pdf 

“FLUID MECHANICS”

Mechanical Engineering MCQS

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FLUID MECHANICS Questions Answers

1. Fluid is a substance that
(a) cannot be subjected to shear forces
(b) always expands until it fills any container
(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

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

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

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

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251. For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal
(a) ratio of inertial force to force due to viscosity
(b) ratio of inertial force to force due to gravitation
(c) ratio of inertial force to force due to surface tension
(d) all the four ratios of inertial force to force due to viscosity, gravitation, sur-face tension, and elasticity
Ans: d

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ENGINEERING MATERIALS - Mechanical Engineering Multiple choice Questions Answers

engineering materials objective type questions 

ENGINEERING MATERIALS

Mechanical Engineering Multiple choice Questions Answers

“ENGINEERING MATERIALS”

Mechanical Engineering MCQS

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ENGINEERING MATERIALS Questions Answers

 

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 perpendicular 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) superhardening.
   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

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195. Lead is poured into the joint between two pipes. These pipes may be made of
(a) cast iron
(b) vitrified clay
(c) asbestos cement
(d) concrete
(e) mild steel.
Ans: a

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PRODUCTION TECHNOLOGY - Mechanical Engineering Multiple choice Questions Answers

production technology objective questions

PRODUCTION TECHNOLOGY 

 Mechanical Engineering Multiple choice Questions Answers

“PRODUCTION TECHNOLOGY”

Mechanical Engineering MCQS

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PRODUCTION TECHNOLOGY Questions Answers

1. Work study is concerned with
(a) improving present method and finding standard time
(b) motivation of workers
(c) improving production capability
(d) improving production planning and control
(e) all of the above.
Ans: a

2. Basic tool in work study is
(a) graph paper
(b) process chart
(c) planning chart
(d) stop watch
(e) analytical mind.
Ans: d

3. What does symbol ‘O’ imply in work study
(a) operation
(b) inspection
(c) transport
(d) delay/temporary storage
(e) none of the above.
Ans: a

4. What does symbol ‘D’ imply in work study
(a) inspection
(b) transport
(c) delay/temporary storage
(d) permanent storage
(e) none of the above.
Ans: c

5. What does symbol ‘V’ employ in work study
(a) operation
(b) inspection
(c) delay/ temporary Storage
(d) permanent storage
(e) none of the above.
Ans: d

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89. Graphical method, simplex method, and transportation method are concerned with
(a) break-even analysis
(b) value analysis
(c) linear programming
(d) queing theory
(e) tnaterial handling.
Ans: c

90. Which one of the following represents a group incentive plan ?
(a) Scanlon Plan
(b) Rowan Plan
(c) Bedaux Plan
(d) Taylor Differential Piece Rate System
(e) Halsey Premium Plan.
Ans: a

PRODUCTION TECHNOLOGY Multiple choice Questions and Answers :-

91. In the Halsey 50-50 plan, the following are rewarded more
(a) past good workers
(b) past poor workers
(c) past average workers
(d) all of the above
(e) none of the above.
Ans: b

92. In the Halsey system of wage incentive plan, a worker is
(a) paid as per efficiency
(b) ensured of minimum wages
(c) not paid any bonus till his efficiency
(d) never a loser
(e) induced to do more work.
Ans: b

 

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179. Pessimistic time is
(a) the maximum time which an activity might require
(b) the average time required for a job
(c) the most probable time considering all conditions
(d) the minimum time in which an activity can possibly be accomplished
(e) the earliest finish.
Ans: a

180. In PERT analysis, critical path is obtained by joining events having
(a) +ve slack
(b) -ve slack
(c) zero sldck
(d) dummy activities
(e) critical activities.
Ans: c

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I.C. Engines - Mechanical Engineering Multiple choice Questions Answers

ic engine objective questions

I.C. Engines

Mechanical Engineering Multiple choice Questions Answers

“I.C. Engines”

Mechanical Engineering MCQS

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I.C. Engines Questions Answers

1. The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft
(a)     1/2
(b)     1
(c)     2
(d)     4
(e)     8.
Ans: c

2. In a diesel engine, the fuel is ignited by
(a)     spark
(b)     injected fuel
(c) heat resulting from compressing air that is supplied for combustion
(d) ignition
(e) combustion chamber.
Ans: c

3. Scavenging air in diesel engine means
(a) air used for combustion sent under pres-sure
(b) forced air for cooling cylinder
(c) burnt air containing products of combustion
(d) air used for forcing burnt gases out of engine's cylinder during the exhaust period
(e) air fuel mixture.
Ans: d

4. Supercharging is the process of
(a) supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere
(b) providing forced cooling air
(c) injecting excess fuel for raising more load
(d) supplying compressed air to remove combustion products fully
(e) raising exhaust pressure.
Ans: a

5. Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ?
(a)     yes
(b)     no
(c) to some extent
(d) unpredictable
(e) depends on other factors.
Ans: b

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249. Method of governing used in diesel engine is
(a) quantity governing
(b) quality governing
(c) combined governing
(d) partial governing
(e) nit and miss governing.

250. An engine has a normal speed of 960 r.p.m. and no load speed of 1000 r.p.m. The speed droop of governor will be about
(a) 2%
(b) 4%
(c) 8%
(d)±4%
(e) 1%.

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MACHINE DESIGN - Mechanical Engineering Multiple choice Questions Answers

machine design objective questions

MACHINE DESIGN

Mechanical Engineering Multiple choice Questions Answers

“MACHINE DESIGN”

Mechanical Engineering MCQS

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MACHINE DESIGN Questions Answers

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 permissible stress for carbon steel under static loading is generally taken as
(a) 2000-3000 kg/pm2
(b) 3000-4000 kg/cm2
(c) 4000-4500 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

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140. The shock absorbing capacity of a bolt can be increased by
(a) tightening it properly
(b) increasing shank diameter
(c) grinding the shank
(d) using washer
(e) making shank diameter equal to core diameter of thread.
Ans: e

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COMPRESSORS, GAS TURBINES and JET ENGINES – Mechanical Engineering Multiple choice Questions Answers

"COMPRESSORS, GAS TURBINES and JET ENGINES"

Mechanical Engineering Multiple choice Questions Answers

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COMPRESSORS GAS TURBINES and JET ENGINES Questions Answers

1. Free air is the air at

(a) atmospheric conditions at any specific location

(b) 20°C and 1 kg/cm2 and relative humidity of 36%

(c) 0°C and standard atmospheric conditions

(d) 15°C and 1 kg/cm2

(e) 25°C, 1 kg/cm2 and relative humidity of 50%.

Ans: a

 

2. Standard air is the air at

(a) atmospheric conditions at any specific location

(b) 20°C and 1 kg/cm2 and relative humidity 36%

(c) 0°C and standard atmospheric conditions

(d) 15°C and 1 kg/cm2

(e) 25°C, 1 kg/cm2 and RH of 60%.

Ans: b

 

3. 1 m of air at atmospheric condition weighs approximately

(a) 0.5 kg

(b) 1.0 kg

(c) 1.3 kg

(d) 2.2 kg

(e) 3.2 kg.

Ans: c

 

 

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227. The compression ratio in a jet engine varies proportional to

(a) speed

(b) speed

(c) altitude

(d) Vspeed

(e) does not Vary.

Ans: b

 

228. The efficiency of jet engine is

(a) higher at ground

(b) higher at high altitudes

(c) same at all altitudes

(d) higher at high speed

(e) lower at low speed.

Ans: b

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