Quiz - Gears & Variable Speed Drives Flashcards Preview

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Flashcards in Quiz - Gears & Variable Speed Drives Deck (31):
1


The distance from the centre of one tooth to the centre of the next tooth, measured along the pitch circle, is called...
a) diametral pitch
b) pitch diameter
c) circular pitch
d) outside diameter


c) circular pitch

2


With an internal spur gear and pinion drive, the shaft centre lines are.....
a) compounding
b) crossing over at 90 degrees
c) intersecting at 90 degrees
d) parallel


d) parallel

3


The input gear of the train has 32 teeth turning at 32rpm; it is connected to the 24 tooth output gear through a 16 tooth idler. What is the end result?
a) speed reduction, rotation change
b) speed increase, rotation change
c) speed reduction, no change in rotation
d) speed increase, no change in rotation


d) speed increase, no change in rotation

4


Angular bevel gears are also known as...
a) mitre
b) spiral bevel
c) straight bevel
d) zerol


c) straight bevel

5


Mitre gears have.....
a) the same number of teeth
b) shafts that cross over at 90 degrees
c) spiral cut teeth
d) varying ratios


a) the same number of teeth

6


The worm and worm wheel gears.....
a) have low sliding action
b) are of opposite hand
c) have parallel shafts
d) are of the same hand


d) are of the same hand

7


Of the following variable speed drives, which one would require a heat exchanger?
a) scoop tube
b) torque converter
c) variable speed chain drive
d) wet disc


d) wet disc

8


A compound gear reducer will have a minimum of.....
a) 2 shafts
b) 3 shafts
c) 4 shafts
d) 5 shafts


b) 3 shafts

9


The tie rod should be kept as near as possible to a _____ line running from the output shaft to the point of attachment.
a) 80°
b) 180°
c) 60°
d) 90°


d) 90°

10


The distance that one tooth on the worm advances in one turn is the.....
a) lead
b) pitch
c) pressure angle
d) helix angle


a) lead

11


Gears that have no effect on gear or speed ratios in a gear train are.....
a) pinion gears
b) idler gears
c) spur gears
d) internal gears


b) idler gears

12


Of the following, which one would best describe a mitre gear box?
a) shafts intersecting at 45° and same # of teeth
b) shafts intersecting at 45° and a different # of teeth
c) shafts intersecting at 90° and same # of teeth
d) shafts intersecting at 90° and a different # of teeth


c) shafts intersecting at 90° and same # of teeth

13


To obtain the greatest area of tooth contact in a worm and worm gear, use.....
a) non throated gear set
b) single throated gear set
c) double throated gear set
d) four start non throated gear set


c) double throated gear set

14


On a worm, the lead is equal to.....
a) the pitch
b) the pitch times number of starts on the worm
c) the pitch times the ratio of the gears
d) the pitch times the # of teeth on the worm wheel


b) the pitch times number of starts on the worm

15


To obtain backlash readings we could use.....
a) the bump check
b) a dial indicator
c) Prussian blue
d) a torque wrench


b) a dial indicator

16


Which of the following types of gears does not produce axial thrust on the shaft?
a) double helical
b) hypoid
c) spiral bevel
d) worm and worm wheel


b) hypoid

17


A non-throated single start worm gear set, has.....
a) the strongest tooth mesh
b) higher contact pressures than a similar sized double throated worm and gear
c) the highest gear ratios
d) the most teeth in mesh


b) higher contact pressures than a similar sized double throated worm and gear

18

The diametral pitch of a gear is.....
a) the circular pitch times number of teeth
b) the distance from one tooth to the next, measured along the pitch line
c) the number of teeth per inch of pitch diameter
d) the ratio of number of teeth to pitch circle


c) the number of teeth per inch of pitch diameter

19


The clearance between mating teeth of gears at the pitch line is called the.....
a) backlash
b) clearance
c) circular pitch
d) diametral pitch


a) backlash

20


The ratio through a single reduction worm gear set is determined by the number of.....
a) starts on the worm
b) teeth on worm divided by number of teeth on gear
c) teeth on gear times number of starts on the worm
d) teeth on gear divided by number of starts on the worm


d) teeth on gear divided by number of starts on the worm

21


The mesh pattern on a non-throated worm reducer is changed by.....
a) increasing input rpm
b) removing the backlash
c) adding or removing shims on the worm shaft bearing end caps
d) adding or removing shims on the worm wheel bearing end caps


d) adding or removing shims on the worm wheel bearing end caps

22


The output speed of a reducer is determined by.....
a) size of the input shaft
b) input and the type of the gears
c) input speed and the gear ratio
d) horsepower rating


c) input speed and the gear ratio

23


The direction of axial thrust in a parallel shaft helical gear set depends upon.....
a) direction of rotation
b) helix angle
c) shaft speed
d) sliding action


a) direction of rotation

24


When referring to a gear tooth, the working depth consists of.....
a) addendum plus dedendum
b) whole depth mines dedendum
c) addendum plus dedendum minus clearance
d) whole depth plus clearance


c) addendum plus dedendum minus clearance

25


Standard gears are available in 14.5° and 20°, these refer to.....
a) the helix angle
b) the crown angle
c) the pressure angle
d) the tapered bore


c) the pressure angle

26


Variable speed belt drives change speed based on the principle of.....
a) varying belt lengths
b) varying belt width
c) varying input speed
d) varying effective sheave diameters


d) varying effective sheave diameters

27


The metal chain variable speed drive is also known as.....
a) positive infinitely variable
b) post internally viable
c) primary internally variable
d) progressively independently variable


a) positive infinitely variable

28


To adjust the speed of a variable speed belt drive, you.....
a) make adjustments when running
b) make adjustments when stopped
c) change to a longer or shorter belt
d) adjust the motor speed using a V.F.D.


a) make adjustments when running

29


In order for helical gears to have parallel shafts they must.....
a) be opposite hands
b) be the same hands
c) have unequal pressure angles
d) have unequal helix angles


a) be opposite hands

30


Of the following, which one will allow for a straddle mounted pinion gear?
a) straight bevel
b) spiral bevel
c) hypoid
d) zerol bevel


c) hypoid

31


The input on a compound gear reducer has a 10 tooth gear driving a 50 tooth gear; the final reduction has an 8 tooth gear driving a 32 tooth output gear, what is the total reduction?
a) 1.5:1
b) 9:1
c) 18:1
d) 20:1


d) 20:1