# 6.1 Power In A Mechanical System: Question Preview (ID: 12609)

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**Which of the following is not a formula for power?**

a) power = work/time

b) P=w/t

c) P=(F x D)/ t

d) P=F/t

**What is the English unit for power?**

a) foot x pound

b) newton x meter

c) watt

d) horsepower

**What is the SI unit for power?**

a) foot x pound

b) newton x meter

c) watt

d) horsepower

**What is the formula for power in a rotational system?**

a) P = (T x (theta))/ t

b) P= T/t

c) P= theta / t

d) P=T/ theta

**One horsepower is equal to how many watts?**

a) 550

b) 134

c) 746

d) 823

**A force of 25 Newtons is needed to keep a piston moving at a speed of 0.5 m/sec. The power of the piston is...**

a) 12.5 watts

b) 25 j/s

c) 50 hp

d) 25 newton meters/sec

**If you have 50 hp in and 25 hp out, what is yoru efficiency?**

a) 25%

b) 50%

c) 100%

d) 200%

**A hydraulic cylinder lifts a steel casting in a manufacturing plant. The casting weighs 200 pounds and is raised 3 feet in 4 seconds at a constant speed. What is the horsepower?**

a) (200)(3) / 4

b) (200)(4) / 3

c) (4)(3) / 200

d) (200) / (4)(3)

**Who was the first person to use power as a technical principle?**

a) Alessandro Volta

b) Andre Marie Ampere

c) George Simon Ohm

d) James Watt

**Power is the rate of doing _________.**

a) force

b) work

c) resistance

d) distance

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