Machine Design MCQs

Question 1

The centre distance between two meshing involute gears is equal to

Accepted Answer

$$\frac{{{	ext{Sum of base circle radii}}}}{{\cos \varphi }}$$

Answer

$$\frac{{{	ext{Difference of base circle radii}}}}{{\cos \varphi }}$$

Answer

$$\frac{{{	ext{Sum of pitch circle radii}}}}{{\cos \varphi }}$$

Answer

$$\frac{{{	ext{Difference of pitch circle radii}}}}{{\cos \varphi }}$$

Question 2

The helix angle for single helical gears ranges from

Accepted Answer

20° to 35°

Answer

10° to 15°

Answer

15° to 20°

Answer

35° to 50°

Question 3

The strap end of a connecting rod of steam engine is joined by

Accepted Answer

Gib of cotter joint

Answer

Sleeve and cotter joint

Answer

Spigot socket cotter joint

Answer

Knuckle joint

Question 4

In thrust bearings, the load acts

Accepted Answer

Along the axis of rotation

Answer

Parallel to the axis of rotation

Answer

Perpendicular to the axis of rotation

Answer

In any direction

Question 5

For steel, the ultimate strength in shear as compared to ultimate strength in tension is

Accepted Answer

$$\frac{2}{3}$$

Answer

$$\frac{1}{2}$$

Answer

$$\frac{1}{3}$$

Answer

$$\frac{1}{4}$$

Question 6

Failure of a material is called fatigue when it fails

Accepted Answer

Below the yield point

Answer

At the elastic limit

Answer

Below the elastic limit

Answer

At the yield point

Question 7

The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to

Accepted Answer

Make M/I constant throughout the length of the leaf

Answer

Obtain variable moment of inertia (I) in each leaf

Answer

Permit each leaf to act as an overhanging beam

Answer

Have variable bending moment (M) in each leaf

Question 8

The taper on a rectangular sunk key is

Accepted Answer

1 in 100

Answer

1 in 16

Answer

1 in 32

Answer

1 in 48

Question 9

The standard length of the shaft is

Accepted Answer

All of these

Answer

6 m

Answer

5 m

Answer

7 m