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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
power = work/time
B
P=w/t
C
P=F/t
D
P=(F x D)/ t
2) What is the English unit for power?
A
horsepower
B
newton x meter
C
watt
D
foot x pound
3) What is the SI unit for power?
A
newton x meter
B
horsepower
C
foot x pound
D
watt
4) What is the formula for power in a rotational system?
A
P= theta / t
B
P = (T x (theta))/ t
C
P= T/t
D
P=T/ theta
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
25 newton meters/sec
B
50 hp
C
12.5 watts
D
25 j/s
7) If you have 50 hp in and 25 hp out, what is yoru efficiency?
A
100%
B
200%
C
50%
D
25%
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)(3) / 4
C
(200) / (4)(3)
D
(200)(4) / 3
9) Who was the first person to use power as a technical principle?
A
Alessandro Volta
B
George Simon Ohm
C
James Watt
D
Andre Marie Ampere
10) Power is the rate of doing _________.
A
distance
B
work
C
force
D
resistance
*select an answer for all questions
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