Machine Design MCQs

Question 1

The strength of a riveted joint is equal to

Accepted Answer

Least value of Pt, Ps and Pc

Answer

Tearing strength of plate (Pt)

Answer

Shearing strength of rivet (Ps)

Answer

Crushing strength of rivet (Pc)

Question 2

In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing

Accepted Answer

Becomes minimum at an optimum speed and then increases with further increase in speed

Answer

Remains constant at all speeds

Answer

Is minimum at zero speed and increases monotonically with increase in speed

Answer

Is maximum at zero speed and decreases monotonically with increase in speed

Question 3

When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the

Accepted Answer

Sum of the initial tension and external load applied

Answer

Initial tension

Answer

External load applied

Answer

Initial tension or external load, whichever is greater

Question 4

When the connected members are very yielding (soft gasket) as compared to the bolt, then the resultant load on the bolt will be equal to the

Accepted Answer

Sum of the initial tension and external load applied

Answer

Initial tension

Answer

External load applied

Answer

Initial tension or external load, whichever is greater

Question 5

When the bolt is very yielding as compared to the connected members, then the resultant load on the bolt will be equal to the

Accepted Answer

Initial tension or external load, whichever is greater

Answer

Initial tension

Answer

External load applied

Answer

Sum of the initial tension and external load applied

Question 6

In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to

Accepted Answer

Increase the key length

Answer

Increase the key depth

Answer

Increase the key width

Answer

Decrease the key length

Question 7

An imaginary circle which by pure rolling action gives the same motion as the actual gear, is called

Accepted Answer

Pitch circle

Answer

Addendum circle

Answer

Dedendum circle

Answer

Clearance circle

Question 8

According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

Accepted Answer

70 to 83%

Answer

45 to 60%

Answer

63 to 70%

Answer

80 to 90%

Question 9

In a marine flange coupling, the thickness of flange is taken as

Accepted Answer

$$\frac{{	ext{d}}}{3}$$

Answer

$$\frac{{	ext{d}}}{2}$$

Answer

$$\frac{{3{	ext{d}}}}{4}$$

Answer

$$\frac{{	ext{d}}}{4}$$