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6 Month 6 > TPC 303.1 Power Transmission Equipment > Flashcards

TPC 303.1 Power Transmission Equipment Flashcards

1
Q

Which of the following factors affects the power transmitted by a belt?

Diameter of the driven sheave and length of the belt
Friction force applied by the belt and speed of the belt
Length and speed of the belt
Width of the belt and tension in the belt

A

Friction force applied by the belt and speed of the belt

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2
Q

Generally, the pitch diameter of a V-belt sheave is ______ the outside diameter

Equal to
Greater than
Less than
Wider than

A

Less than

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3
Q

Among conventional V belts, the narrowest is designated ______ and the widest is designated ______

1; 10
A; E
A; Z
A1; E4

A

A; E

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4
Q

The advantage of using a group belt instead of multiple belts is that the group is

Less expensive
More durable
More flexible
More uniform

A

More uniform

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5
Q

Because of their removable side flanges, spring–loaded adjustable sheaves require

Fixed-Center drive machinery
Frequent adjustment
Lubrication
Timing belt

A

Lubrication

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6
Q

Among the advantages of chain drives over belt drives is the fact that chain drives

Are more efficient
Are quieter
Can connect sprockets on shafts at 90°
Tolerate more misalignment

A

Are more efficient

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7
Q

Roller chains include the following parts:

Bearings, pin links, rollers, contoured teeth
Bushings, bearings, pin teeth, roller links
Guide teeth, guide links, pin links, roller links
Roller links, pin, links, rollers, bushings

A

Roller links, pin links, rollers, bushings

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8
Q

Offset roller chain differs from standard roller chain, and that the side bars are ______ on one end of each link

Closer together
Elongated
Heavier
Missing

A

Closer together

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9
Q

A chain sprocket with a hub on both sides is a type _____ sprocket. A sprocket with a hub on only one side as a type______ sprocket

A; B
B;A
C; B
B; C

A

C; B

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10
Q

When you install a roller chain, proper procedure includes

Installing the chain with a slight amount of slack on both sides
Installing the chain with tension on the driving side only
Installing the chain with tension on the non-driving side only
Moving one or both sprockets to draw the chain tight on both sides

A

Installing the chain with tension on the driving side only

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11
Q

The working depth of a gear is the distance a gear tooth

Extends into the space between the teeth of the mating gear
Penetrates the arc of the pitch circle of the mating gear
Rises from the root of the gear
Spans along the pitch circle

A

Extends into the space between the teeth of the mating gear

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12
Q

Calculate the diametral pitch of the gear described below

1.57
2.00
2.04
2.26

A

2.04

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13
Q

The advantages of helical gears over spur gears include

Double cutting action
Side thrust
Smooth action
Variable gear ratio

A

Smooth action

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14
Q

Herringbone gears differ from double-cut helical gears in that they (have)

Lower helix angles
No gap between the two sets of teeth
Produce no side thrust
Run at higher speeds

A

No gap between the two sets of teeth

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15
Q

The axial pitch of a worm gear is the linear distance

A tooth on the mating spur gear advances for each rotation of the worm
Between the screw threads
From one end of the worm thread to the other end
From the worm thread to a plane perpendicular to the worm centerline

A

Between the screw threads

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16
Q

The main purpose of a miter-gear box is to change the _____. It’s gear ratio is typically about ______ to one

Direction of motion; one
Power delivered; two
Power ratio; ten
Speed of a shaft; two

A

Direction of motion; one

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17
Q

The main steps in installing a new foot-mounted gear drive include

Aligning the equipment
Checking the gear ratio
Installing the right size gears
Measuring the motor speed

A

Aligning the equipment

18
Q

The mechanical power of a gear drive is based on the _____ of the gear drive

Size and torque limit
Speed and size
Speed and torque limit
Torque limit and gear ratio

A

Speed and torque limit

19
Q

The service factor for a gear drive depends in part on the

Duty cycle
Gear ratio
Overload capacity
Thermal power rating

A

Duty cycle

20
Q

In parallel-shaft gear drives, oil is commonly provided to the gears by means of

Gravity feed and reservoirs
Periodic maintenance
Reservoirs, wicks, and troughs
Splash lubrication, and pressurized feed

A

Splash lubrication and pressurized feed

21
Q

The most important factors in selecting an adjustable-speed drive include the unit’s____

Cost, energy consumption, and speed range
Maintenance requirements, maximum power, and size
Maximum power, speed required, and speed range
Speed response, reliability, and size

A

Maximum power, speed required, and speed range

22
Q

As you force together the flanges on the input sheave of an adjustable-speed belt drive while it is running, the flanges on the output sheave move ______ and the output shaft speed ______

Closer together; decreases
Down; decreases
Farther apart; increases
Up; increases

A

Farther apart; increases

23
Q

An adjustable–speed drive can be controlled by a(n)

Crank mechanism, spring, or microprocessor
Gear mechanism, electric motor, or pneumatic piston
Electric relay, flexible shaft, or spring
Pneumatic piston, microprocessor, or flexible shaft

A

Gear mechanism, electric motor, or pneumatic piston

24
Q

The belts used in adjustable-speed drives resemble ______ belts. In drives that use chain, the chain is similar to a ______ chain.

Conveyor; roller
Flat; conveyor
Timing; leaf
V; silent

A

Timing; leaf

25
Q

To align a new motor with an existing pump using the reverse indicator method, you mount the dial indicator(s) on the coupling flange(s) located on (the)_____ shaft(s). Each dial indicator takes readings from the flange(s) mounted on (the)______ shafts

Both;same
Both;opposite
Motor;same
Only one; opposite

A

Both; opposite

26
Q

When aligning three machines, you can align two of them to the third, unless doing so would require

Aligning them to a new reference line
Lowering one machine and raising the other
Lowering one or both below the support base
Raising one machine and lowering the other

A

Lower one or both below the support base

27
Q

To align a new motor with an existing pump using the face-rim indicator method, you mount the dial indicator(s) on the coupling flange(s) located on (the) _____shaft(s). Each dial indicator takes readings from the flange(s) mounted on (the) _____ shaft(s).

Both; same
Both; opposite
Motor; same
Only one; opposite

A

Only one; opposite

28
Q

When aligning two machines joined by a long shaft, you use ______ dial indicators, which you mount on (the) _______

One; connecting shaft
One; one coupling flange only
Two; one coupling flange, and the connecting shaft
Two; opposite coupling flanges

A

Two; opposite coupling flanges

29
Q

What are the advantages of laser alignment equipment over dial indicators?

Alignment is automatic and more accurate
Can be used while the equipment is running, resulting in faster alignment
Easier, faster, more accurate alignment
More accurate alignment and shims are not required

A

Easier, faster, more accurate alignment

30
Q

The two major classifications of jaw couplings are the ______ jaw couplings.

Block and spider
Flexible and rigid
Spider and tapered
Square-faced and tapered

A

Flexible and rigid

31
Q

The advantages of a chain coupling include the fact that the chain

Breaks to protect against overloads
Can be replaced without disconnecting the coupling hubs
Can compensate for significant misalignment of the shafts
Can run in either direction

A

Can be replaced without disconnecting the coupling hubs

32
Q

If an overload occurs in a machine driven by a shear-pin coupling, the

Bushings bend
Coupling Flanges brake
Coupling flanges slip
Pins break

A

Pins break

33
Q

The special features of limited-end-float couplings include the

Extension spacer
Fixed hub
Floating hub
Thrust plate

A

Thrust plate

34
Q

Spacer couplings provide certain advantages over ordinary couplings, including the fact that they_____

Add torsion and vibration damping to the coupling
Are designed to slip if an overload occurs
Are useful if the driven decide cannot be located near the driving motor
Simplify the process of disconnecting a driving shaft from the driven shaft

A

Simplify the process of disconnecting a driving shaft from the driven shaft

35
Q

The purpose of a clutch include

Allowing one device to either be connected to another or to run independently
Compensating for misalignment
Controlling the speed of the driven machine
Permanently joining the shafts of two machines

A

Allowing one device to either be connected to another or to run independently

36
Q

When a friction clutch operates, a _____forces the______.

Set of wedges; plates together or apart
Set of wedges; shafts into alignment
Shifting device; plates together or apart
Shifting device; shafts into alignment

A

Shifting device; plates together or apart

37
Q

An overrunning clutch is useful in equipment where the driven machine might need to

Run both forward and backward
Run faster than the motor
Start under heavy load
Stop without warning

A

Run faster than the motor

38
Q

An electric clutch should be used with a load that must

Start and stop frequently
Start only in an emergency
Start and stop only rarely
Run for several minutes and then stop for an hour or more

A

Start and stop frequently

39
Q

In a single-impeller fluid clutch, motion is directly transmitted from the drive shaft in which sequence?

Clutch housing, fluid, impeller
Fluid, impeller, clutch housing
Impeller, clutch housing, fluid
Impeller, fluid, clutch housing

A

Impeller, fluid, clutch housing

40
Q

In a roller-type adjustable-speed drive, the rollers have a ______ shape. Changes in speed are accomplished by changing the ______ of the rollers.

Conical; angle
Conical; axial position
Cylindrical; angle
Cylindrical; axial position

A

Conical; axial position

6 Month 6 (8 decks)

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