MCQs Competitive Mechanical Engineering – Machine Design MCQs Latest
This post is comprising of latest “Machine Design MCQs Latest – Competitive Machine Design MCQs “. Here you’ll get latest mechanical engineering mcqs for written test, interview with answers. If you want to improve your knowledge regarding mechanical engineering then read these mcqs of Design of Steel Structures.
Latest Mechanical Engineering MCQs
By practicing these MCQs of Mechanical Engineering MCQs – Machine Design Mcqs, an individual for exams performs better than before. This post comprising of mechanical engineering objective questions and answers related to “Machine Design Mcqs“. As wise people believe “Perfect Practice make a Man Perfect”. It is therefore practice these mcqs of mechanical engineering to approach the success. Tab this page to check “Latest Machine Design Mcqs” for the preparation of competitive mcqs, FPSC mcqs, PPSC mcqs, SPSC mcqs, KPPSC mcqs, AJKPSC mcqs, BPSC mcqs, NTS mcqs, PTS mcqs, OTS mcqs, Atomic Energy mcqs, Pak Army mcqs, Pak Navy mcqs, CTS mcqs, ETEA mcqs and others.
Latest Machine Design Mcqs
The most occurred mcqs of Machine Design in past papers. Past papers of Machine Design Mcqs. Past papers of Machine Design Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Machine Design Mcqs. The Important series of Machine Design Mcqs are given below:
The property of a material which enables it to resist fracture due to high impact loads is known as__________________?
A. endurance
B. elasticity
C. strength
D. toughness
E. resilience
Guest’s theory of failure is applicable for following type of materials_________________?
A. elastic
B. ductile
C. brittle
D. plastic
E. tough
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. WpE/2
C. vVvF
D. IvHpE
E. none of the above,
where E = modulus of elasticity and p = mass density
Resilience of a material is important, when it is subjected to________________?
A. combined loading
B. thermal stresses
C. fatigue
D. wear and tear
E. shock loading
Other method of reducing shock load in the above case can be_________________?
A. unaffected by length
B. to increase length
C. to decrease length
D. other factors would decide same
E. none of the above
Brittle coating technique is used for_________________?
A. protecting metal against corrosion
B. determining brittleness
C. protecting metal against wear and tear
D. experimental stress analysis
E. non-destructive testing of metals
The endurance limit of a material with finished surface in comparison to rough surface is_________________?
A. more
B. same
C. less
D. more or less depending on quantum of load
E. unpredictable
The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be_________________?
A. same in both cases
B. 4 times more
C. 3 times more
D. 2 times more
E. unpredictable
Stress concentration in static loading is more serious in__________________?
A. depends on other factors
B. brittle materials
C. equally serious in both cases
D. ductile materials
E. unpredictable
Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to________________?
A. static loading
B. dynamic loading
C. combined static and dynamic loading
D. completely reversed loading
E. all of the above
Which of the following is not correct procedure to increase the fatigue limit_______________?
A. shot peening
B. cold working
C. surface decarburisation
D. under-stressing
E. all of the above
Stress concentration in static loading is_________________?
Which is correct statement ?
A. very serious in brittle materials and less serious in ductile materials
B. very serious in ductile materials and less serious in brittle materials
C. seriousness would depend on other factors
D. equally serious in both types of materials
E. none of the above
Stress concentration in cyclic loading is____________________?
Which is correct statement ?
A. very serious in brittle materials and less serious in ductile materials
B. seriousness would depend on other factors
C. equally serious in both types of materials
D. very serious in ductile materials and less serious in brittle materials
E. none of the above
If a material fails below its yield point, failure would be due to___________________?
A. creep
B. fatigue
C. straining
D. sudden loading
E. impact loading
In Vicker’s hardness testing, the pyramid indentor apex is__________________?
A. 122°
B. 40°
C. 136°
D. 152°
E. 161°.
In testing a material for endurance strength, it is subjected to_______________________?
A. dynamic load
B. static load
C. impact load
D. static as well as dynamic load
E. completely reversed load
The notch angle of the Izod impact test specimen is________________?
A. 20°
B. 10°
C. 30°
D. 45°
E. 60°.
Coaxing is the procedure of increasing__________________?
A. metal hardness by surface treatment
B. metal strength by cycling
C. metal resistance to corrosion by coating
D. fatigue limit by overstressing the metal by successively increasing loadings
E. none of the above
Fatigue strength can be increased by__________________?
A. shot peening
B. cold working
C. grinding and lapping surface
D. hot working
E. using gradual changes of section
Stress concentration in cyclic loading is more serious in__________________?
A. ductile materials
B. equally serious in both cases
C. brittle materials
D. depends on other factors
E. unpredictable
The fatigue life of a part can be improved by_____________________?
A. polishing
B. electroplating
C. coating
D. shot peening
E. heat treating
Plastic flow in ductile materials_____________________?
A. increases the seriousness of static load-ing stress concentration
B. lessens the seriousness of static load¬ing stress concentration
C. depends on other considerations
D. has no effect on it
E. none of the above
Stress concentration is caused due to_____________________?
A. variation in properties of material from point to point in a member
B. abrupt change of section
C. pitting at’points or areas at which loads on a member are applied
D. all of the above
E. none of the above
If a load W is applied instantaneously on a bar; then the stress induced in bar will___________________?
A. be independent of ratio of mass of load W to mass of bar (y)
B. decrease with decrease in y
C. increase with increase in y
D. depend on other considerations
E. none of the above
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. remain unaffected with cross-section area
C. increasing the cross-section area of bar
D. would depend upon other factors
E. none of the above
Tensile strength of a mild steel specimen can be roughly predicted from following hardness test_________________?
A. Brinell
B. Vicker
C. Rockwell
D. Shore’s sceleroscope
E. none of the above
Engineering Materials Mcqs
Rankine’s theory of failure is applicable for following type of materials___________________?
A. brittle
B. elastic
C. ductile
D. plastic
E. tough
A hot short metal is_________________?
A. brittle under all conditions
B. brittle when hot
C. brittle when cold
D. ductile at high temperature
E. hard when hot
The permissible stress for carbon steel under static loading is generally taken as__________________?
A. 3000-4000 kg/cm2
B. 2000-3000 kg/pm2
C. 4000-4500 kg/cm2
D. 7500-10,000 kg/cm2
E. 10,000-15,000 kg/cm2
The ultimate strength of steel in tension in comparison to shear is in the ratio of__________________?
A. 2:1
B. 1 : l
C. 3 : 2
D. 2 : 3
E. 1 : 2
The fatigue limit of a material____________________?
A. is greatly decreased by poor surface conditions
B. depends mainly on core composition
C. remains same irrespective of surface conditions
D. is dependent upon yield strength of material
E. none of the above
Yield point in fatigue loading as compared to static loading is__________________?
A. higher
B. same
C. lower
D. depends on other factors
E. none of the above
The building up of worn and uridersized parts, subjected to repeated loads by electroplating is_____________________?
A. best method
B. cheapest method
C. has no effect as regards fatigue strength
D. extremely hazardous
E. all of the above
Which process will increase the fatigue duration of parts ?
A. decarburisation
B. shot-peening
C. finishing and polishing
D. electroplating
E. all of the above”.
Hydraulic Mechanics Mcqs
In nitrated parts, the origins of the fatigue cracks will occur at__________________?
A. just below the surface
B. surface
C. within the core
D. could occur anywhere
E. none of the above
Cold working________________?
A. increases the fatigue strength
B. has no influence on fatigue strength
C. decreases the fatigue strength
D. alone has no influence on fatigue strength
E. none of the above
Residual stress in materials_________________?
A. is always harmful
B. becomes zero when external load is removed
C. is independent of external loads
D. acts when external load is applied
E. is always beneficial
The ratio of endurance limit in shear to the endurance limit in flexure is__________________________?
A. 0.33
B. 0.5
C. 0.4
D. 0.55
E. 0.6
Resistance to fatigue of a material is measured by________________?
A. coefficient of elasticity
B. Young’s modulus
C. elastic limit
D. ultimate tensile strength
E. endurance limit
For steel, the ultimate strength in shear as compared to ultimate strength in tension is ___________________?
A. same
B. 1/3
C. 1/2
D. 1/4
E. 2/3
At low temperatures (say 75°C) the notched-bar impact value of steel____________________?
A. depends on heat treatment carried out
B. decreases markedly
C. remains same
D. increases markedly
E. none of the above
The crest diameter of a screw thread is same as _____________________?
A. major diameter
B. pitch diameter
C. minor diameter
D. core diameter
E. none of the above
Maximum principal stress theory is applicable for_____________________?
A. elastic materials
B. brittle materials
C. ductile materials
D. all of the above
E. none of the above
A stud________________________?
A. has a head on one end and a nut fitted to the other
B. has head at one end and other end fits into a tapped hole in the other part to be joined
C. has both the ends threaded
D. requires locking nuts
E. has pointed threads
A tap bolt_____________________?
A. has a head on one end and a nut fitted to the other
B. has head at one end and other end fits into a tapped hole in the other part o be joined
C. has both the ends threaded
D. requires locking devices
E. has pointed threads
The included angle in unified of American National threads is___________________?
A. 60°
B. 47°
C. 55°
D. 29°
E. none of the above
Cap screws are___________________?
A. similar to’small size tap bolts except that a greater variety of shapes of heads are available
B. slotted for a screw driver and generally used with a nut
C. provided with detachable caps
D. used to prevent relative motion be-tween parts
E. similar to stud
The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be________________?
A. 8/2
B. 28
C. 48
D. 8/4
E. none of the above
Fluid Mechanics Mcqs
Set screws are_________________?
A. similar to small size tap bolts except that a greater variety of shapes of heads are available
B. similar to stud
C. used to prevent relative motion be-tween parts
D. slotted for a screw driver and generally used with a nut
E. none of the above
An alien bolt is___________________?
A. same as stud
B. self locking bolt
C. provided with hexagonal depression in head
D. used in high speed components
E. provided with countersunk head
Ball bearing type screws are found in following application_____________________?
A. aeroplane engines
B. screw jack
C. crane
D. steering mechanism
E. bench vice
The function of a washer is to___________________?
A. absorb shocks and vibrations
B. provide bearing area
C. provide cushioning effect
D. provide smooth surface in place of rough surface
E. act as a locking device
For applications involving high stresses in one direction only the following type of thread would be best suited______________________?
A. acme thread
B. ISO metric thread
C. square thread
D. buttress thread
E. British Association thread
Shear stress theory is applicable for____________________?
A. ductile fnaterials
B. elastic materials
C. brittle materials
D. all of the above
E. none of the above
The following type of nut is used with alien bolt____________________?
A. hexagonal nut
B. alien nut
C. slotted nut
D. castle nut
E. any one of the above
If d is the diameter of bolt hole then for a flanged pipe joint to be leak proof, the circumferential pitch of the bolts should be_________________?
A. 10VZtol5Vd
B. lOVZ
C. 15Vdto20VZ
D. 20Vdto30Vd
E. 30V5″to40Vd
A bolt___________________?
A. has a head on one end and a nut fitted to the other
B. has head at one end and other end fits into a tapped hole in the other part to be joined
C. is provided with pointed threads
D. has both the ends threaded
E. requires no nut
The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of____________?
A. 0.45
B. 0.25
C. 0.55
D. 0.65
E. 0.75
Which is correct statement ?
A. a member made of steel will generally be more rigid than a member of equal load-carrying ability made of cast iron
B. a member made of cast iron will generally be. more rigid than a member of equal load carrying ability made of steel
C. which one is rigid will depend on several other factors
D. both will be equally rigid
E. none of the above
A self locking screw has________________
A. coarse threads
B. fine threads
C. coefficient of friction > tangent of load angle
D. hole for inserting split pin
E. two nuts for locking
Machine screws are________________?
A. similar to small size tap bolts except that a greater variety of shapes of heads are available
B. slotted for a screw driver and generally used with a nut
C. similar to stud
D. used to prevent relative motion be-tween two parts
E. none of the above
The edges of a boiler plate are bevelled to an angle of______________?
A. 45°
B. 30°
C. 60°
D. 80°
E. 85°
In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia of rivet d should be equal to__________________?
A. 1.25 d
B. d
C. 1.5 d
D. 1.75 d
E. 2 d.
Transverse fillet welded joints are designed for________________?
A. tensile strength
B. shear strength
C. compressive strength
D. bending strength
E. torsional strength
The pitch of threads on a Jock nut in comparison to pitch of nut is_________________?
A. same
B. finer
C. coarser
D. very coarse
E. very fine
In order to obtain bolt of uniform strength____________________?
A. increase its length
B. increase shank diameter
C. drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread
D. tighten die bolt properly
E. all of the above
A key made from a cylindrical disc having segmental cross-section, is known as______________?
A. wood-ruff key
B. flat saddle key
C. feather key
D. gib head key
E. hollow saddle key
Fibrous fracture occurs in_____________?
A. ductile material
B. elastic material
C. brittle material
D. hard material
E. all of the above
Eye bolts are used for_________________?
A. locking devices *
B. foundation purposes
C. absorbing shock and vibrations
D. transmission of power
E. lifting and transportation of machines and cubicles
If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation_______________?
A. 124 d
B. 102 d
C. 138 d
D. 151 d
E. 168 d