Free Printable Efficiency Practice

1.

What equation should you use to determine the efficiency of a machine?

a)

$\%Eff=\frac{work_{out}}{work_{in}}\cdot100$

b)

$work_{out}=\frac{\%Eff\cdot work_{in}}{100}$

c)

$work_{in}=\frac{work_{out}\cdot100}{\%Eff}$

2.

What equation should you use to determine the work input to a machine?

a)

$\%Eff=\frac{work_{out}}{work_{in}}\cdot100$

b)

$work_{out}=\frac{\%Eff\cdot work_{in}}{100}$

c)

$work_{in}=\frac{work_{out}\cdot100}{\%Eff}$

3.

What equation should you use to determine the work output of a machine?

a)

$\%Eff=\frac{work_{out}}{work_{in}}\cdot100$

b)

$work_{out}=\frac{\%Eff\cdot work_{in}}{100}$

c)

$work_{in}=\frac{work_{out}\cdot100}{\%Eff}$

4.

When you solve for work output, what unit should you use for your answer?

a)

joules (J)

b)

newtons (N)

c)

percent (%)

5.

When you solve for efficiency, what unit should you use for your answer?

a)

joules (J)

b)

newtons (N)

c)

percent (%)

6.

When you solve for work input, what unit should you use for your answer?

a)

joules (J)

b)

newtons (N)

c)

percent (%)

7.

Which of the following would be the correct way to report a machine's efficiency?

a)

60 J

b)

60

c)

60%

8.

Which of the following would be the correct way to report a machine's work output?

a)

60 J

b)

60

c)

60%

9.

You input 100 J of work to a machine that gives 50 J of work output. What is the machine's efficiency?

a)

150%

b)

50%

c)

2%

d)

5000%

10.

You solve a problem and find that you have machine with 150% efficiency. Can your answer be correct?

a)

No, the answer is wrong.

b)

Yes, the answer can be right.

c)

Not enough information to tell.

Efficiency Practice

Total questions: 10

Worksheet time: 5mins

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