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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