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6.1 Power In A Mechanical System
Test Description: Power section one
Instructions: Answer all questions to get your test result.
1) Which of the following is not a formula for power?
A
P=F/t
B
P=(F x D)/ t
C
power = work/time
D
P=w/t
2) What is the English unit for power?
A
watt
B
newton x meter
C
horsepower
D
foot x pound
3) What is the SI unit for power?
A
foot x pound
B
newton x meter
C
watt
D
horsepower
4) What is the formula for power in a rotational system?
A
P= theta / t
B
P= T/t
C
P=T/ theta
D
P = (T x (theta))/ t
5) One horsepower is equal to how many watts?
A
823
B
134
C
746
D
550
6) 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
7) If you have 50 hp in and 25 hp out, what is yoru efficiency?
A
25%
B
100%
C
50%
D
200%
8) 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
(4)(3) / 200
B
(200) / (4)(3)
C
(200)(4) / 3
D
(200)(3) / 4
9) Who was the first person to use power as a technical principle?
A
George Simon Ohm
B
Andre Marie Ampere
C
James Watt
D
Alessandro Volta
10) Power is the rate of doing _________.
A
distance
B
force
C
work
D
resistance
*select an answer for all questions
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