Real Time Strength of Materials Questions with Answers PDF
1.Define: Column and strut.
A column is a long vertical slender bar or vertical member, subjected to an axial compressive load and fixed rigidly at both ends.
A strut is a slender bar or a member in an y position other than vertical, subjected to a compressive load and fixed rigidly or hinged or pin jointed at one or both the ends.
2. What are the types of column failure?
a. Crushing failure:
The column will reach a stage, when it will be subjected to the ultimate crushing stress, beyond this the column will fail by crushing The load corresponding to the crushing stress is called crushing load. This type of failure occurs in short column.
b. Buckling failure:
This kind of failure is due to lateral deflection of the column. The load at which the column just buckles is called buckling load or crippling load or critical load. This type of failure occurs in long column
3. What is slenderness ratio (buckling factor)? What is its relevance in column?
It is th e ratio of effective length of column to the least radius of gyration of the cross sectional ends of the column.
Slenderness ratio = l eff / r
l eff = effective length of column
r = least radius of gyration
Slenderness ratio is used to differentiate the type of column.Strength of the column depends upon the slenderness ratio,it is increased the compressive strength the column decrease as the tendency to buckle is increased.
4. Can anybody please provide any link to calculate force required to bend a metal sheet into pipe? or describe how is it calculated?
It depends upon the thickness of sheet and required diameter to be formed from the sheet.
5. A bearing designated as 6205 , what is it’s bore diameter:
Generally for bearing bore diameter is 5 times the last number in its designation i.e. for designation 6205, Bore diameter should be 25
6. Where half nut is use
the half hut is use in lathe .in this half nut mechanism is engaged during the thread cutting operation.and it connect carriage and lead screw.it having 2 portion one half is fixed and one movable.
7. Why the rail in form of I-beam?
It’s flexural rigidity is high and it’s cross section consume low metal.
8. Aluminium foil used for cooking food and storage has one shiny surface and one dull surface. Which surface side be on the outside when the food wrapped for baking and freezing respectively.
Shiny side, shiny side
Dull side, dull side
Shiny side, dull side
Dull side, shiny side
Answer:
Dull side, Shiny side
Reason:
The shiny surface of foil loses heat through radiation much faster than the dull surface.
When the food baked shiny surface kept inside, so the heat kept inside and not to leave.
When the food freeze shiny surface kept outside, so the loss of heat radiated faster which keeps the food in cool.
9. What is difference between pressure and stress?
When the force or load acting on the fluid (pneumatic or hydraulic) per unit area is known as PRESSURE.. its purely subjected to fluids……..
when the force or load acting on the object (solid) within the elastic limit of an object create internal resistance to resist the apply load. that internal resistance is known as STRAIN for per unit area of that object.. Its mainly subjected to solids…
10. Is there any rake angle in blade? which used to shave the beard ?
it consists of negative rake angle.
11. Stress strain diagram for fluid
Parallel line horizontal to stress axis
12. What’s the range of poisons ratio of a stable material?
Theoretical values are — -1 to 0.5
Practical values are — 0 to 0.5
13. Why 220 V A.C. is more dangerous than 220 V D.C
The D.C. attracts
Peak voltage for A.C. is much larger
The body offers less resistance to A.C.
Due to some other reasons
Answer:
Peak voltage for A.C. is much larger
Reason:
D.C. = 220 volt
A.C. = 1.414 x 220 volt
14. What is the difference between limit of proportionality and elastic limit
Up to the limit of proportionality stress is directly proportional to strain,follows hooks law,elastic limit is limit for elasticity of material.
=> Also Read Strength of Materials MCQsA strut is a slender bar or a member in an y position other than vertical, subjected to a compressive load and fixed rigidly or hinged or pin jointed at one or both the ends.
2. What are the types of column failure?
a. Crushing failure:
The column will reach a stage, when it will be subjected to the ultimate crushing stress, beyond this the column will fail by crushing The load corresponding to the crushing stress is called crushing load. This type of failure occurs in short column.
b. Buckling failure:
This kind of failure is due to lateral deflection of the column. The load at which the column just buckles is called buckling load or crippling load or critical load. This type of failure occurs in long column
It is th e ratio of effective length of column to the least radius of gyration of the cross sectional ends of the column.
Slenderness ratio = l eff / r
l eff = effective length of column
r = least radius of gyration
Slenderness ratio is used to differentiate the type of column.Strength of the column depends upon the slenderness ratio,it is increased the compressive strength the column decrease as the tendency to buckle is increased.
4. Can anybody please provide any link to calculate force required to bend a metal sheet into pipe? or describe how is it calculated?
It depends upon the thickness of sheet and required diameter to be formed from the sheet.
5. A bearing designated as 6205 , what is it’s bore diameter:
Generally for bearing bore diameter is 5 times the last number in its designation i.e. for designation 6205, Bore diameter should be 25
6. Where half nut is use
the half hut is use in lathe .in this half nut mechanism is engaged during the thread cutting operation.and it connect carriage and lead screw.it having 2 portion one half is fixed and one movable.
7. Why the rail in form of I-beam?
It’s flexural rigidity is high and it’s cross section consume low metal.
8. Aluminium foil used for cooking food and storage has one shiny surface and one dull surface. Which surface side be on the outside when the food wrapped for baking and freezing respectively.
Shiny side, shiny side
Dull side, dull side
Shiny side, dull side
Dull side, shiny side
Answer:
Dull side, Shiny side
Reason:
The shiny surface of foil loses heat through radiation much faster than the dull surface.
When the food baked shiny surface kept inside, so the heat kept inside and not to leave.
When the food freeze shiny surface kept outside, so the loss of heat radiated faster which keeps the food in cool.
9. What is difference between pressure and stress?
When the force or load acting on the fluid (pneumatic or hydraulic) per unit area is known as PRESSURE.. its purely subjected to fluids……..
when the force or load acting on the object (solid) within the elastic limit of an object create internal resistance to resist the apply load. that internal resistance is known as STRAIN for per unit area of that object.. Its mainly subjected to solids…
10. Is there any rake angle in blade? which used to shave the beard ?
it consists of negative rake angle.
11. Stress strain diagram for fluid
Parallel line horizontal to stress axis
12. What’s the range of poisons ratio of a stable material?
Theoretical values are — -1 to 0.5
Practical values are — 0 to 0.5
13. Why 220 V A.C. is more dangerous than 220 V D.C
The D.C. attracts
Peak voltage for A.C. is much larger
The body offers less resistance to A.C.
Due to some other reasons
Answer:
Peak voltage for A.C. is much larger
Reason:
D.C. = 220 volt
A.C. = 1.414 x 220 volt
14. What is the difference between limit of proportionality and elastic limit
Up to the limit of proportionality stress is directly proportional to strain,follows hooks law,elastic limit is limit for elasticity of material.
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