Title: M4L2 Quiz
Course: WIND 100WH Introduction to Wind Energy > Section: WIND 100WH Introduction to Wind Energy

Q: The image above is a _______________________.
- tapered plain bearing
- helical bearing
- ball bearing
- needle bearing
- None of the above
A: None of the above

Q: The space between gear teeth is called _______________ and it must be compensated for to prevent control loops from interpreting it as a position problem. It increases as the gears wear.
- backlash
- counter lash
- countersink
- tooth distance
A: backlash

Q: A tapered roller bearing is built at a small angle to prevent friction from axial, but not radial forces.
- True
- False
A: False

Q: An ordinary bearing may be as simple as a bushing, which are simple devices made of special metals, separated from the other surfaces usually by a lubricant.
- True
- False
A: True

Q: The axis is the observed line about which the bearing and components rotate.
- True
- False
A: True

Q: A ___________ roller bearing has two separate roller rows on the single race; they are designed to withstand more weight than a regular roller bearing.
- double-row
- tapered type
- dual-acting
- double faced
A: double-row

Q: A/n ____________ is similar to a tapered roller bearing, but has a greater taper angle. They’re designed to absorb thrust loads pushing against it. A very large ____________ is what larger nacelles rest upon and is called the yaw bearing.
- thrust bearing
- plain bearing
- planar bearing
- axial roller
A: thrust bearing

Q: Torque and velocity together are what “powers” a gearbox’s input shaft. For a reduction-type gearbox, ________ is decreased and torque is __________ at the output shaft.
- Velocity; increased
- Torque; increased
- Velocity; decreased
- Torque; decreased
A: Velocity; increased

Q: If a gearbox with a gear ratio of 15:4 has its driven shaft (input shaft) coupled to a shaft running at 300 rpm, its output speed would be 4/15 of 300, which is equal to ________________.
- 80 rpm
- 88 rpm
- 40 rpm
- 300 rpm
A: 80 rpm

Q: A helical gear is a gear that overcomes fatiguing forces, mainly axial thrust, by having its teeth straight rather than diagonal.
- True
- False
A: False

Q: Bearings are often housed in pillow blocks, cassettes, and are sometimes pressed into position.
- True
- False
A: True

Q: If a gearbox has a gear ratio of 3.6:17 it is a reduction-type gearbox.
- True
- False
A: True

Q: A worm gear could be used to change high-speed, low-torque rotation into low-speed, high-torque rotation. This would be a type of reduction gearbox.
- True
- False
A: True

Q: Gear backlash could be measured with a feeler gauge.
- True
- False
A: True

Q: The bearing above would be ideal for very heavy, often static loads.
- True
- False
A: False

Q: A hand press, such as an arbor press, is used to push smaller bearings into their housings.
- True
- False
A: True

Q: The clearance of a gear is the distance between __________.
- gear two’s base and the other gear’s tooth surface
- gear one’s base and the other gear’s tooth surface
- the center-to-center distance minus the sum of the root radii for each gear
- All of the above
A: All of the above

Q: There should be a clearance of _____________ between gears with a center-to-center distance of 76.25mm. Given gear one has a root diameter of 50mm and gear two has a root diameter of 100mm.
- 1.25mm
- 2mm
- 10mm
- 1/16 inches
- None of the above
A: 1.25mm

Q: If a gearbox’s input shaft is to endure 30 foot-pounds of torque at 500 rpm what should its minimum Horsepower be?
- 3
- .5
- 1.5
- 2.25
A: 3

Q: ___________________ act as greasing points for the bearing. They provide an attachment point for grease gun nozzle to attach to. A grease gun forces grease in through the ____________________’s check valve, thus re-lubricating components.
- Grease-sert (grease insert)
- Grease bypass
- Grease spot
- Lubrication inspection glass
A: Grease-sert (grease insert)

Q: Since planetary gears use many gears, they have a much needed high gear ratio and also create less stress on their individual gears, however they have a great need for maintenance.
- True
- False
A: True

Q: Planetary gears are used for speed/torque conversion. Planetary gearboxes are a part of a large wind turbine’s various motor-drive systems (yaw and pitch) and also the larger rotor gearbox.
- True
- False
A: True

Q: The bearing above should be used for ______________________________________.
- absorbing axial and radial forces, such as a wheel
- absorbing radial forces, such as a propeller or turbine shaft
- absorbing great axial forces, such as a heavily weighted spindle
- none of the above
A: absorbing axial and radial forces, such as a wheel

Q: A worm gear should ____________ be used to change low-speed, high-torque rotation into high-speed, high-torque rotation.
- never
- always
- sometimes
- only
A: never

Q: An ideal gearbox has no internal friction and therefore would be 100% efficient. However, this is not ever the case, as gearboxes have internal losses due to friction and heat. When solving equations for power output, this must be considered as a type of _____________.
- coefficient
- value
- counter measure
- efficiency gain
A: coefficient

Q: A simple gearbox has an input gear with 45 teeth, which drives an output gear with 165 teeth. What is the overall gear ratio? What is the speed (in rpm) of the output shaft, if the input shaft is turning at 330 rpm? The gearbox must be rated near __________ Horsepower if the output shaft is to turn with 80 ft-lbs of torque.
- 11:3, 30, ½ H.P.
- 11:3, 1/3, 0.2 H.P.
- 11:3, 30, 100 H.P.
- 11:3, 1/3, 20 H.P.
A: 11:3, 30, ½ H.P.

Q: To change an oscillating (back and forth) linear motion into an oscillating rotational motion a spur and rack gear would be used.
- True
- False
A: True

Q: The image above is a _______________________.
- roller bearing
- ball bearing
- tube roller
- barrel bearing
A: roller bearing

Q: The __________ force is the force acting on the bearing surfaces.
- radial
- concentric
- net
- backlash
A: radial

Q: Gearboxes have a rated torque for the input and outputs shafts, and also an overall power rating, (usually in Horsepower in the U.S.)
- True
- False
A: True