# 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? |
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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? |
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a) foot x pound | b) newton x meter | c) watt | d) horsepower | |

What is the SI unit for power? |
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a) foot x pound | b) newton x meter | c) watt | d) horsepower | |

What is the formula for power in a rotational system? |
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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? |
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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... |
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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? |
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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? |
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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? |
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a) Alessandro Volta | b) Andre Marie Ampere | c) George Simon Ohm | d) James Watt | |

Power is the rate of doing _________. |
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a) force | b) work | c) resistance | d) distance | |

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