OB7

Question 1

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

Answer 1

B

Question 2

The pitch dia. of a V belt sheave is ___ the outside dia.
equal to
greater than
less than
wider than

Answer 2

C

Question 3

Among conventional V belts the narrowest is designated ___ and the widest designated ___
1;10
A;E
A;Z
A1;E4

Answer 3

B

Question 4

The advantage of using a group belt instead of multiple is that the group is
less expensive
more durable
more flexible
more uniform

Answer 4

D

Question 5

Because of their moveable side flanges, spring loaded adjustable sheaves require
fixed-center drive machinery
frequent adjustment
lubrication
timing belts

Answer 5

C

Question 6

Among the advantage of chain drives over belt drives is the fact chain drives
are more efficient
are quieter
can connect sprockets on shafts at 90 degree
tolerate more misalignment

Answer 6

A

Question 7

Roller chains include the following parts
bearings, pin links, rollers, contoured teeth
bushing, bearings, pin teeth, roller links
guide teeth, guide links, pin links, roller links
roller links, pin links, rollers, bushings

Answer 7

D

Question 8

Offset roller chains differs from standard roller chains in that the sidebars are ___ on one end of each link
closer together
elongated
heavier
missing

Answer 8

A

Question 9

A chain sprocket with a hub on both sides is a Type ___ sprocket. A sprocket with a hub on only one side is a Type ___ sprocket
A;B
B;A
C;B
B;C

Answer 9

C

Question 10

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

Answer 10

B

Question 11

The working depth of a gear is the distance a gear tooth
extends into the space between the teeth of the mating surface
penetrates the arc of the pitch circle of the mating gear
rises from the root of the gear
spans along the pitch circle

Answer 11

A

Question 12

calculate the diametrical pitch of the gear below
1.57
2.00
2.04
2.26

Answer 12

C

Question 13

The advantages of helical gears over spur gears include
double cutting action
side thrust
smooth action
variable gear ratio

Answer 13

C

Question 14

Herringbone gears differ from double cut helical gears in that they
lower helix angles
no gap between the two sets of teeth
produce no side thrust
run at higher speeds

Answer 14

B

Question 15

The axial pitch of a warm 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

Answer 15

B

Question 16

The main purpose of a miter-gear box is to change the ___ its gear ration is typically about ___ to one
direction of motion; one
power delivered; two
power ratio; ten
speed of shaft; two

Answer 16

A

Question 17

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

Answer 17

A

Question 18

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

Answer 18

C

Question 19

The service factor for a gear drive depends in part on the
duty cycle
gear ratio
overload capacity
thermal power rating

Answer 19

A

Question 20

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

Answer 20

D

Question 21

The most important factors in selecting an adjustable speed drive include the units
cost, energy consumption, and speed range
maintenance req., max power, size
max power, speed required, and speed range
speed response, reliability, and size

Answer 21

C

Question 22

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
further apart, increases
up, increases

Answer 22

C

Question 23

An adjustable speed drive can be controlled by a
crank mechanism, spring, or microprocessor
gear mechanism, electric motor, or pneumatic piston
electric relay, flexible shaft, or spring
pneumatic piston, microprocessor, or flexible shaft

Answer 23

B

Question 24

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

Answer 24

C

Question 25

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

Answer 25

B

Question 26

To align a new motor with existing pump using the reverse indicator method, mount the indicator on the coupling flange located on the ___ shafts. Each indicator takes readings from the flanges mounted on the ___ shafts both, same both, opposite motor, same only one, opposite

Answer 26

B

Question 27

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

Answer 27

C

Question 28

To a align a new motor with an existing pump using the face rim indicator method, you mount the indicator on the coupling flange located on the ___ shafts. Each dial indicator takes readings from the flanges mounted on the ___ shafts both, same both, opposite motor, same only one, opposite

Answer 28

D

Question 29

When aligning two machines joined by a long shaft, you use ___ dial indicators, which you mount on ___ one, connecting shafts one, one coupling flange only two, one coupling flange and the connecting shaft two, opposite coupling flanges

Answer 29

D

Question 30

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 easier, faster, more accurate more accurate aligning and shims are not required

Answer 30

C

Question 31

The two major classifications of jaw couplings are the ___ jaw couplings block and spider flexible and rigid spider and tapered square faced and tapared

Answer 31

B

Question 32

The advantages of a chain coupling include the fact that the chain breaks to protect against overload can be replaced without disconnecting the coupling hubs can compensate for significant misalignment can be in either direction

Answer 32

B

Question 33

If an overload occurs in a machine driven by a shear pin coupling the bushings bend coupling flanges break coupling flanges split pins break

Answer 33

D

Question 34

The special features of limited end float couplings include the extension spacer fixed hub floating hub thrust plate

Answer 34

D

Question 35

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

Answer 35

D

Question 36

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

Answer 36

A

Question 37

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

Answer 37

C

Question 38

An overrunning clutch is useful in equipment where the driven machine might need to run both forward and backward run faster that the motor start under heavy load stop without warning

Answer 38

B

Question 39

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

Answer 39

A

Question 40

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

Answer 40

D