- Sierra College
- Mechanical Engineering
- Mechanical Engineering 7
- Mechanical Comprehension
Last Modified: 2011-07-13
An induction clutch is a magnetic clutch.
Mechanical advantage can be calculated as Length of Effort Arm ÷ Length of Resistance Arm. MA = 8 ÷ 2 = 4.
To determine the answer, multiply the number of teeth Gear 1 has (D) and the number of revolutions it makes (R). Divide that number by the number of teeth Gear 2 has (d) to determine the number of revolutions Gear 2 makes (r). Because the gears are proportional, this formula will show you the ratio of teeth to revolutions.
r = DR/d
r = (25 × 10)/15
r = 250⁄15, or 1610⁄15, or 162⁄3
Machine springs are usually made of steel although sometimes they’re made of brass or other metal alloys.
Clutches connect and disconnect parts, so they’re a type of coupling.
A single block-and-fall is called a runner.
Gears with their teeth together in mesh turn in opposite directions. Gear A turns Gear B in the opposite direction (right), and Gear B turns Gear C in the opposite direction (left).
The formula for determining power is Power = Work ÷ Time.
A simple pulley gives no mechanical advantage, although it does make work easier by spreading out the work needed over several tries. So the mechanical advantage is 1.
You can calculate psi as Pressure = Force÷Area. So, in this problem, P = 200÷10 = 20.
The formula to determine mechanical advantage of an incline plane is Length of Ramp ÷Height of Ramp=Weight of Object ÷Effort. Plugging in the numbers gives you:
6 ÷ 3 = 200 ÷ E
6E = 600
E = 100
Thicknesses to a few thousandths of an inch. Micrometers measure very small but not microscopic objects.
Objects rubbing together produce friction.
“Normal” atmospheric pressure is 14.7 psi.
Torsion springs coil or uncoil and produce a twisting action, not a direct pull.
To move a heavy object a few feet in height, the incline plane is the most efficient device (of those listed) to use.
Water expands when it freezes, possibly damaging engine components.
A yellow flame on a gas furnace indicates:
The fuel-air mixture is too rich.
A yellow flame indicates too much fuel or not enough air. More air should be allowed to enter and mix with the gas. Thus, the fuel-air mixture is too rich.
A blue flame indicates too much air or not enough fuel. More fuel should be allowed to enter and mix with the air. Thus, the fuel-air mixture is too lean.
The float measures the water level in the tank. If the tank overflows, the float is probably defective.
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