ASVAB Mechanical Comprehension Practice Test 92996 Results

	Your Results	Global Average
Questions	5	5
Correct	0	2.96
Score	0%	59%

Review

1 What is the power output of a 4 hp engine that's 95% efficient?

39% Answer Correctly

	2090 \( \frac{ft⋅lb}{s} \)
	0 \( \frac{ft⋅lb}{s} \)
	23 \( \frac{ft⋅lb}{s} \)
	4180 \( \frac{ft⋅lb}{s} \)

Solution

\( Efficiency = \frac{Power_{out}}{Power_{in}} \times 100 \)
Solving for power out: \( P_{o} = \frac{E \times P_{i}}{100} \)
Knowing that 1 hp = 550 \( \frac{ft⋅lb}{s} \), P_i becomes 4 hp x 550 \( \frac{ft⋅lb}{s} \) = 2200 \( \frac{ft⋅lb}{s} \)
\( P_{o} = \frac{E \times P_{i}}{100} = \frac{95 \times 2200 \frac{ft⋅lb}{s}}{100} \) \( = \frac{209000 \frac{ft⋅lb}{s}}{100} \) = 2090 \( \frac{ft⋅lb}{s} \)

Collinear forces:

72% Answer Correctly

	pass through a common point
	are unrelated to each other
	act in a common plane
	act along the same line of action

Solution

Collinear forces act along the same line of action, concurrent forces pass through a common point and coplanar forces act in a common plane.

Which of the following is not a type of bridge?

74% Answer Correctly

	cable
	truss
	arch
	block

Solution

The six basic bridge forms are beam, truss, arch, cantilever, cable, and suspension.

A truck is using a rope to pull a car. Tension in the rope is greatest in which of the following places?

50% Answer Correctly

	in the middle
	near the truck
	tension is equal in all parts of the rope
	near the car

Solution

Tension is a force that stretches or elongates something. When a cable or rope is used to pull an object, for example, it stretches internally as it accepts the weight that it's moving. Although tension is often treated as applying equally to all parts of a material, it's greater at the places where the material is under the most stress.

The work done by the sum of all forces acting on a particle equals the change in the kinetic energy of the particle. This defines which of the following?

60% Answer Correctly

	Pascal's law
	conservation of mechanical energy
	mechanical advantage
	work-energy theorem

Solution

The work-energy theorem states that the work done by the sum of all forces acting on a particle equals the change in the kinetic energy of the particle. Simply put, work imparts kinetic energy to the matter upon which the work is being done.