ASVAB Mechanical Comprehension Practice Test 381110 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.31
Score	0%	66%

Review

1 How much work can a 1 hp engine do in 8 seconds?

52% Answer Correctly

	0 ft⋅lb
	2 ft⋅lb
	4400 ft⋅lb
	8 ft⋅lb

Solution

Horsepower (hp) is a common measure of power output for complex machines. By definition, a 1 hp machine does 550 ft⋅lb of work in 1 second: 1 hp = 550 ft⋅lb/s. Substituting the variables for this problem gives us:
\( W = 1 hp \times 550 \frac{ft⋅lb}{s} \times 8s = 4400 ft⋅lb \)

The mechanical advantage of a block and tackle is equal to which of the following?

69% Answer Correctly

	the number of connecting ropes
	the number of loads
	the number of input forces
	the number of pulleys

Solution

Two or more pulleys used together constitute a block and tackle which, unlike a fixed pulley, does impart mechanical advantage as a function of the number of pulleys that make up the arrangement. So, for example, a block and tackle with three pulleys would have a mechanical advantage of three.

3 If A = 2 ft. and the green box weighs 45 lbs. what is the torque acting on the A side of this lever?

75% Answer Correctly

	90 ft⋅lb
	0 ft⋅lb
	45 ft⋅lb
	180 ft⋅lb

Solution

For a lever, torque is weight x distance from the fulcrum which, in this case, is: 45 ft. x 2 lbs. = 90 ft⋅lb

4 What's the mechanical advantage of a wedge that's 3 inches wide and 24 inches long?

83% Answer Correctly

	2
	24
	11
	8

Solution

The mechanical advantage (MA) of a wedge is its length divided by its thickness:

MA = \( \frac{l}{t} \) = \( \frac{24 in.}{3 in.} \) = 8

The science that deals with motion and the forces that produce motion is called which of the following?

57% Answer Correctly

	aeronautics
	physics
	mechanics
	engineering

Solution

Mechanics deals with motion and the forces that produce motion.