ASVAB Mechanical Comprehension Practice Test 487240 Results

Your Results Global Average
Questions 5 5
Correct 0 2.94
Score 0% 59%

Review

1 What is the power output of a 2 hp engine that's 70% efficient?
40% Answer Correctly
192.5 \( \frac{ft⋅lb}{s} \)
256.7 \( \frac{ft⋅lb}{s} \)
770 \( \frac{ft⋅lb}{s} \)
35 \( \frac{ft⋅lb}{s} \)
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 \( \frac{ft⋅lb}{s} \), Pi becomes 2 hp x 550 \( \frac{ft⋅lb}{s} \) = 1100 \( \frac{ft⋅lb}{s} \)
\( P_{o} = \frac{E \times P_{i}}{100} = \frac{70 \times 1100 \frac{ft⋅lb}{s}}{100} \) \( = \frac{77000 \frac{ft⋅lb}{s}}{100} \) = 770 \( \frac{ft⋅lb}{s} \)
2

Specific gravity is a comparison of the density of an object with the density of:

57% Answer Correctly

oil

carbon

water

air
Solution

Specific gravity is the ratio of the density of equal volumes of a substance and water and is measured by a hyrdometer.

3

Force of friction due to kinetic friction is __________ the force of friction due to static friction.

40% Answer Correctly

the same as

opposite

higher than

lower than
Solution

The formula for force of friction (Ff) is the same whether kinetic or static friction applies: Ff = μFN. To distinguish between kinetic and static friction, μk and μs are often used in place of μ.

4

Which of the following is not a type of bridge?

74% Answer Correctly

arch

truss

cable

block
Solution

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

5

Which of these is the formula for force?

77% Answer Correctly

F = m/a

F = a/m

F = am2

F = ma
Solution

Newton's Second Law of Motion states that "The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object." This Law describes the linear relationship between mass and acceleration when it comes to force and leads to the formula F = ma or force equals mass multiplied by rate of acceleration.