Mechanical Engineering Archives

4081. Which of the following statements regarding laws governing the friction between dry surfaces are correct?

The friction force is dependent on the materials of the contact surfaces.

The friction force is directly proportional to the normal force.

The friction force is independent of me area of contact.

all of the above

✅ The correct answer is option D.

4082. The uniform pressure theory gives a higher frictional torque than the uniform wear theory.

Agree

Disagree

✅ The correct answer is option A.

4083. There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is

Jan-24

1-Aug

Apr-15

✅ The correct answer is option A.

4084. In a __________ , the molten metal is poured and allowed to solidify while the mould is revolving.

die casting method

slush casting method

permanent mould casting method

centrifugal casting me

✅ The correct answer is option D.

4085. In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.

equal to

twice

three times

four times

✅ The correct answer is option D.

4086. The Poisson’s ratio for steel varies from

0.23 to 0.27

0.27 to 0.30

0.31 to 0.34

0.32 to 0.42

✅ The correct answer is option B.

4087. Tool life is measured by the

number of pieces machined between tool sharpenings

time the tool is in contact with the job

volume of material removed between tool sharpenings

all of the above

✅ The correct answer is option D.

4088. A column of length (l) with both ends fixed may be considered as equivalent to a column of length __________ with one end fixed and the other end free.

l/8

l/4

l/2

✅ The correct answer is option B.

4089. A column of length (l) with both ends fixed may be considered as equivalent to a column of length __________ with both ends hinged.

l/8

l/4

l/2

✅ The correct answer is option C.

4090. In a leaf spring, the deflection at the centre is

✅ The correct answer is option C.