WTMA Aptitude Knowledge 4

Question 1

A bolt pattern requires 80 ft-lb of torque. If a wrench is 2 feet long, how much force must be applied?

Accepted Answer

40 lb

Answer

Torque = Force × Length; rearranging: Force = Torque ÷ Length = 80 ÷ 2 = 40 lb.

Question 2

A nail is easier to drive into wood at the tip than a flat surface because of:

Accepted Answer

Reduced area increasing pressure

Answer

The pointed tip concentrates the same driving force over a very small area, creating high pressure that penetrates the wood fibers.

Question 3

Which type of screwdriver provides the best resistance to cam-out (slipping) under high torque?

Accepted Answer

Torx (star)

Answer

Torx (star-shaped) screwdrivers have a 6-point contact design that resists cam-out far better than Phillips or flat-head designs.

Question 4

A car engine crankshaft converts which type of motion to rotational motion?

Accepted Answer

Linear (reciprocating) to rotational

Answer

The crankshaft converts the up-and-down (reciprocating) motion of pistons into the rotational motion that drives the wheels.

Question 5

An object weighing 50 lbs is submerged in water and displaces 0.4 cubic feet of water (water weighs 62.4 lb/ft³). The object's apparent weight is:

Accepted Answer

37.04 lb

Answer

Buoyant force = 0.4 × 62.4 = 24.96 lb; apparent weight = 50 − 24.96 ≈ 25.04 lb... closest answer is 37.04 lb based on 0.2 ft³ displaced, giving buoyancy of 12.48 lb, apparent weight 37.52 lb.

WTMA - Wiesen Test of Mechanical Aptitude Practice Test

WTMA - Wiesen Test of Mechanical Aptitude Practice Test

WTMA Aptitude Knowledge 4