Machine Design MCQs

Option A: 0.33

Option B: 0.4

Option C: 0.5

Option D: 0.55

Correct Answer: 0.5 ✔

Option A: acts when external load is applied

Option B: becomes zero when external load is removed

Option C: is independent of external loads

Option D: is always harmful

Correct Answer: is independent of external loads ✔

Option A: increases the fatigue strength

Option B: decreases the fatigue strength

Option C: has no influence on fatigue strength

Option D: alone has no influence on fatigue strength

Correct Answer: increases the fatigue strength ✔

Option A: surface

Option B: just below the surface

Option C: within the core

Option D: could occur anywhere

Correct Answer: none of the above ✔

Option A: finishing and polishing

Option B: shot-peening

Option C: decarburisation

Option D: electroplating

Correct Answer: shot-peening ✔

Option A: best method

Option B: extremely hazardous

Option C: has no effect as regards fatigue strength

Option D: cheapest method

Correct Answer: best method ✔

Option A: same

Option B: higher

Option C: lower

Option D: depends on other factors

Correct Answer: lower ✔

Option A: is greatly decreased by poor surface conditions

Option B: remains same irrespective of surface conditions

Option C: depends mainly on core composition

Option D: is dependent upon yield strength of material

Correct Answer: is greatly decreased by poor surface conditions ✔

Option A: 1 : l

Option B: 2:1

Option C: 3 : 2

Option D: 2 : 3

Correct Answer: 3 : 2 ✔

Option A: 2000-3000 kg/pm2

Option B: 3000-4000 kg/cm2

Option C: 4000-4500 kg/cm2

Option D: 7500-10,000 kg/cm2

Correct Answer: 4000-4500 kg/cm2 ✔

Option A: brittle when cold

Option B: brittle when hot

Option C: brittle under all conditions

Option D: ductile at high temperature

Correct Answer: brittle when hot ✔

Option A: brittle

Option B: ductile

Option C: elastic

Option D: plastic

Correct Answer: brittle ✔

Option A: Brinell

Option B: Rockwell

Option C: Vicker

Option D: Shore’s sceleroscope

Correct Answer: Brinell ✔

Option A: decreasing the cross-section area of’ bar

Option B: increasing the cross-section area of bar

Option C: remain unaffected with cross-section area

Option D: would depend upon other factors

Correct Answer: decreasing the cross-section area of’ bar ✔

Option A: be independent of ratio of mass of load W to mass of bar (y)

Option B: increase with increase in y

Option C: decrease with decrease in y

Option D: depend on other considerations

Correct Answer: be independent of ratio of mass of load W to mass of bar (y) ✔

Option A: variation in properties of material from point to point in a member

Option B: pitting at’points or areas at which loads on a member are applied

Option C: abrupt change of section

Option D: all of the above

Correct Answer: all of the above ✔

Option A: increases the seriousness of static load-ing stress concentration

Option B: lessens the seriousness of static load¬ing stress concentration

Option C: has no effect on it

Option D: depends on other considerations

Correct Answer: lessens the seriousness of static load¬ing stress concentration ✔

Option A: electroplating

Option B: polishing

Option C: coating

Option D: shot peening

Correct Answer: shot peening ✔

Option A: ductile materials

Option B: brittle materials

Option C: equally serious in both cases

Option D: depends on other factors

Correct Answer: ductile materials ✔

Option A: cold working

Option B: shot peening

Option C: grinding and lapping surface

Option D: hot working

Correct Answer: hot working ✔

Option A: metal strength by cycling

Option B: metal hardness by surface treatment

Option C: metal resistance to corrosion by coating

Option D: fatigue limit by overstressing the metal by successively increasing loadings

Correct Answer: fatigue limit by overstressing the metal by successively increasing loadings ✔

Option A: 10°

Option B: 20°

Option C: 30°

Option D: 45°

Correct Answer: 45° ✔

Option A: static load

Option B: dynamic load

Option C: impact load

Option D: static as well as dynamic load

Correct Answer: completely reversed load ✔

Option A: 40°

Option B: 122°

Option C: 136°

Option D: 152°

Correct Answer: 136° ✔

Option A: straining

Option B: fatigue

Option C: creep

Option D: sudden loading

Correct Answer: fatigue ✔

Option A: very serious in brittle materials and less serious in ductile materials

Option B: very serious in ductile materials and less serious in brittle materials

Option C: equally serious in both types of materials

Option D: seriousness would depend on other factors

Correct Answer: equally serious in both types of materials ✔

Option A: very serious in brittle materials and less serious in ductile materials

Option B: very serious in ductile materials and less serious in brittle materials

Option C: equally serious in both types of materials

Option D: seriousness would depend on other factors

Correct Answer: very serious in brittle materials and less serious in ductile materials ✔

Option A: cold working

Option B: shot peening

Option C: surface decarburisation

Option D: under-stressing

Correct Answer: surface decarburisation ✔

Option A: dynamic loading

Option B: static loading

Option C: combined static and dynamic loading

Option D: completely reversed loading

Correct Answer: completely reversed loading ✔

Option A: ductile materials

Option B: brittle materials

Option C: equally serious in both cases

Option D: depends on other factors

Correct Answer: brittle materials ✔

Option A: same in both cases

Option B: 2 times more

Option C: 3 times more

Option D: 4 times more

Correct Answer: 3 times more ✔

Option A: more

Option B: less

Option C: same

Option D: more or less depending on quantum of load

Correct Answer: more ✔

Option A: determining brittleness

Option B: protecting metal against corrosion

Option C: protecting metal against wear and tear

Option D: experimental stress analysis

Correct Answer: experimental stress analysis ✔

Option A: to decrease length

Option B: to increase length

Option C: unaffected by length

Option D: other factors would decide same

Correct Answer: to increase length ✔

Option A: combined loading

Option B: fatigue

Option C: thermal stresses

Option D: wear and tear

Correct Answer: shock loading ✔

Option A: vpE

Option B: vVvF

Option C: WpE/2

Option D: IvHpE

Correct Answer: vpE ✔

Option A: brittle

Option B: ductile

Option C: elastic

Option D: plastic

Correct Answer: ductile ✔

Option A: elasticity

Option B: endurance

Option C: strength

Option D: toughness

Correct Answer: toughness ✔