The most common cause of failure in jaw clutches is
A.) age
B.) excessive water
C.) inadequate lubrication
D.) jaw breakage
D.) jaw breakage
V-belt sheaves, shafts, and gears can all be used as
A.) actuators
B.) engagers
C.) flexible couplings
D.) takeoff members
D.) takeoff members
Localized wear on clutch friction surfaces often indicates
A.) excessive vibration
B.) leaked lubricant
C.) misalignment
D.) overheating
C.) misalignment
Frequent slippage of a brake or clutch is usually an indication of
A.) leaked lubricant
B.) misalignment
C.) overloading
D.) shock loading
C.) overloading
Chatter is usually caused by?
A.) Accumutated dust on friction surfaces
B.) improper installation
C.) Loose or faulty actuating devices
D.) slippage of friction surfaces
C.) loose or faulty actuating devices
Friction clutches use one or more discs to
A.) dissipate heat
B.) increase RPM
C.) reduce capacity to size ratio
D.) transmit torque to the load
D.) transmit torque to the load
Rapid wear between the friction surfaces by an electric brake or clutch is usually the result of?
A.) dirt and dust
B.) lack of lubrication
C.) overheating
D.) shaft misalignment
C.) overheating
When the slip speed of a clutch drops to zero, the maximum torque the clutch can exert
A.) decreases
B.) does not change
C.) drops to zero
D.) increases
D.) increases
The capacity of a clutch to dissipate heat depends on its size and?
A.) armature speed
B.) pickup torque
C.) response time
D.) spiking voltage
A.) amature speed
If a brake or clutch falls to engage property, the first thing to check is the?
A.) burnishing of its friction surfaces
B.) contact of its armature and rotor
C.) field coil and wiring
D.) voltage supply to the field coil
D.) voltage supply to the field coil
At ___ output speed, the flanges on the input shaft of an adjustable-speed drive are ___ .
A.) maximum, closest together
B.) maximum, farther apart
C.) minimum, closest together
D.) minimum, in contact
A.) maximum, closest together
The best protection against unwanted heat in an enclosed drive is a(n)?
A.) layer of fiberglass
B.) outdoor location
C.) small fan
D.) steel baffle
D.) steel baffle
When test-running an adjustable-speed drive under no-load conditions, it is necessary to operate the drive
A.) for at least two hours
B.) only at its highest speed
C.) only at its lowest speed
D.) through its full speed range
D.) through its full speed range
If you find ridges in a drive’s sheave fianges on an adjustable speed drive, you should?
A.) realign the sheaves
B.) replace the drive belt
C.) replace the flanges
D.) sand or polish the ridges away
D.) sand or polish the ridges away
In an enclosed drive, high temperatures usually result from (a)?
A.) broken drive belt
B.) faulty bearing seals
C.) oil seepage
D.) overloading the shaft bearings
D.) overloading the shaft bearings
The amount of slip between a turbine and its impeller is normally a difference of ___ to ___ percent at full load
A.) 3 to 5
B.) 8 to 10
C.) 15 to 20
D.) 25 to 50
A.) 3 to 5
A condition called a “stall load” can occur in a fluid coupling when the impeller ___ and the turbine ____.
A.) does not rotate, does not rotate
B.) does not rotate, rotates
C.) rotates, does not rotate
D.) rotates, rotates
C.) rotates, does not rotate
Overheating in a fluid coupling is usually caused by?
A.) high-temperature surroundings
B.) soft starting
C.) too much slip
D.) vibration
C.) too much slip
A polyphase torque converter has ___ stator(s) that ____.
A.) one, does not rotate
B.) one, rotates
C.) two or more, do not rotate
D.) two or more, rotate
D.) two or more, rotate
If you find seals that are hard and cracked when you are inspecting a coupling, you should?
A.) add more fluid to the reservoir
B.) decrease the load
C.) replace them
D.) do nothing - this condition is normal
C.) replace them
An enclosed gear drive’s thermal capacity is usually expressed in?
A.) degrees Celsius
B.) degrees Fahrenheit
C.) horsepower
D.) volts
C.) horsepower
When you need to change the speed of a load shaft you should select a drive with a(n)?
A.) adjustable speed belt
B.) fluid coupling
C.) right angle drive shafts
D.) two flexible couplings
A.) adjustable speed belt
The major cause of drive fallure is?
A.) improper lubrication
B.) misaligned shafts
C.) overheating
D.) overloading the drive
A.) improper lubrication
If an overload occurs in a drive system that is equipped with a spring-operated overload device the
A.) motor will stop
B.) pin will shear
C.) sprocket will slip
D.) torque will continue
C.) sprocket will slip
