Machine Design MCQs

Question 1

According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by

Accepted Answer

Equating tearing resistance of the plate to the crushing resistance of the rivets

Answer

Equating tearing resistance of the plate to the shearing resistance of the rivets

Answer

Equating shearing resistance to the crushing resistance of the rivets

Answer

None of the above

Question 2

According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by

Accepted Answer

Equating shearing resistance to the crushing resistance of the rivets

Answer

Equating tearing resistance of the plate to the shearing resistance of the rivets

Answer

Equating tearing resistance of the plate to the crushing resistance of the rivets

Answer

None of the above

Question 3

I.S. specifies following total number of grades of tolerances

Accepted Answer

18

Answer

16

Answer

20

Answer

22

Question 4

When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt)

Accepted Answer

d

Answer

0.5 d

Answer

0.75 d

Answer

1.25 d

Question 5

The function of cutting oil when threading a pipe is to

Accepted Answer

All of the above

Answer

Provide cooling action

Answer

Lubricate the dies

Answer

Help removes chips

Question 6

The dedendum is the radial distance from the

Accepted Answer

Pitch circle to the bottom of a tooth

Answer

Pitch circle to the top of a tooth

Answer

Top of a tooth to the bottom of a tooth

Answer

Addendum circle to the clearance circle

Question 7

If threads on a bolt are left hand, threads on nut will be

Accepted Answer

Left hand with same pitch

Answer

Right hand with same pitch

Answer

Could be left or right hand

Answer

Right hand with fine pitch

Question 8

If a load W is applied instantaneously on a bar; Then the stress induced in bar will

Accepted Answer

Be independent of ratio of mass of load W to mass of bar (y)

Answer

Increase with increase in y

Answer

Decrease with decrease in y

Answer

Depend on other considerations

Question 9

Plastic flow in ductile materials

Accepted Answer

Lessens the seriousness of static loading stress concentration

Answer

Increases the seriousness of static loading stress concentration

Answer

Has no effect on it

Answer

Depends on other considerations