Machine Design MCQs

Question 1

In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

Accepted Answer

Smaller than

Answer

Larger than

Answer

Equal to

Answer

None of these

Question 2

Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.

Accepted Answer

Eight times

Answer

Twice

Answer

Four times

Answer

Sixteen times

Question 3

A riveted joint is a __________ fastening.

Accepted Answer

Permanent

Answer

Temporary

Answer

Either A or B

Answer

None of these

Question 4

The expansion joint is mostly used for pipes which carry steam at __________ pressures.

Accepted Answer

High

Answer

Low

Answer

Medium

Answer

None of these

Question 5

The V-belts are particularly suitable for __________ drives.

Accepted Answer

Short

Answer

Long

Answer

Both A and B

Answer

None of these

Question 6

A crankshaft is a __________ shaft.

Accepted Answer

Machine

Answer

Transmission

Answer

Machine frame

Answer

None of these

Question 7

A single strap butt joint is always in __________ shear.

Accepted Answer

Single

Answer

Double

Answer

Triple share

Answer

None of these

Question 8

The dedendum circle diameter is equal to (where $$\varphi $$ = Pressure angle)

Accepted Answer

Pitch circle diameter × cos$$\,\varphi $$

Answer

Addendum circle diameter × cos$$\,\varphi $$

Answer

Clearance circle diameter × cos$$\,\varphi $$

Answer

Pitch circle diameter × sin$$\,\varphi $$

Question 9

The velocity factor for precision metallic gears cut with high accuracy and operating at velocities up to 20 m/s is equal to

Accepted Answer

$$\frac{{0.75}}{{0.75 + \sqrt {	ext{v}} }}$$

Answer

$$\frac{3}{{3 + {	ext{v}}}}$$

Answer

$$\frac{{4.5}}{{4.5 + {	ext{v}}}}$$

Answer

$$\frac{6}{{6 + {	ext{v}}}}$$