MILLWRIGHT LEVEL 3 LATEST EXAMS SCRIPT
QUESTIONS AND ANSWERS SURE A+
✔✔What is the Region of Instability? - ✔✔Basically, the fan attempts to generate airflow
and in turn causes the system pressure to increase. Consequently this reduces the
generated airflow. Air flow decreases, so does the system pressure and the fan
responds by creating more airflow. This cyclic behaviour sounds like the fan is
breathing.
✔✔Connecting fans in parallel creates more flow, connecting them in the series creates
more ________ ? - ✔✔Pressure
✔✔What is the name of the circular collection chamber mounted around the fan wheel
of a centrifugal fan? - ✔✔A scroll
✔✔What are two ways of placing bearings on a shaft in relationship to the fan wheel? -
✔✔The wheel can be mounted between the bearings, or the wheel can be mounted
overhung on the shaft.
✔✔What are four key components of a conveyor system? - ✔✔Belts, idlers
Idlers
Take up devices
Loading and unloading devices
, ✔✔What is the purpose of a tripper? - ✔✔A tripper allows the discharge of material at
any point along the length of the conveyor.
✔✔What is required to permit the conveyor to operate efficiently with a constant load? -
✔✔A constant uniform feed. Feeder belts are a lot wider than regular conveyor belts
and tend to be flat. The belt may have a raised edge to prevent side spillage.
✔✔What are the three main components of a conventional multi-ply belt? - ✔✔The Top
cover, the Carcass, and the Bottom cover (pulley cover). Other components include the
Ply, Wrap, Fill, Friction, Skim coat, and Breaker fabric.
✔✔What is the portion of the belt that carries the load and tension? - ✔✔The Carcass
✔✔What are three types of joining methods for belts? - ✔✔Mechanical fasteners, cold
self splicing, hot vulcanized splicing.
✔✔What type of fastener would be best suited for small repairs or tears to a belt? -
✔✔A bolted plate (double plate)
✔✔How much belt strength does hot vulcanizing retain? - ✔✔About 85-90%
✔✔What type of pulley is required with a steel core belt? - ✔✔Smooth pulley
✔✔What type of pulley is used to prevent material buildup between belt and pulley? -
✔✔A self cleaning pulley or wing pulley
✔✔What is a pintle chain and what classes do they come in? - ✔✔Each link is a one
piece casting of malleable iron with both barrel and side bars. The sidebars are offset
from the barrel to the width greater than that of the barrel. It comes in 400 and 700
series, the latter being a longer pitch, heavier duty chain used for conveying.
✔✔What is an H-class mill chain, and what range of pitches are commonly used? -
✔✔This is the same design as the pintle, but it has heavier construction and flanged
wearing shoes cast onto the bottom surface for applications with abrasive materials.
The pitch generally ranges from 1.654 inches to 4 inches.
✔✔What pitches are commonly found on a drag or refuse chain? - ✔✔5 to 12 inches. It
is commonly used in the lumber, cement, and Pulp and Paper Industries where it
conveys sawdust or hog fuel.
✔✔What is a detachable chain and what is its application? - ✔✔This chain is one of the
simplest chain drives because it requires no special tools to assemble or disassemble.
QUESTIONS AND ANSWERS SURE A+
✔✔What is the Region of Instability? - ✔✔Basically, the fan attempts to generate airflow
and in turn causes the system pressure to increase. Consequently this reduces the
generated airflow. Air flow decreases, so does the system pressure and the fan
responds by creating more airflow. This cyclic behaviour sounds like the fan is
breathing.
✔✔Connecting fans in parallel creates more flow, connecting them in the series creates
more ________ ? - ✔✔Pressure
✔✔What is the name of the circular collection chamber mounted around the fan wheel
of a centrifugal fan? - ✔✔A scroll
✔✔What are two ways of placing bearings on a shaft in relationship to the fan wheel? -
✔✔The wheel can be mounted between the bearings, or the wheel can be mounted
overhung on the shaft.
✔✔What are four key components of a conveyor system? - ✔✔Belts, idlers
Idlers
Take up devices
Loading and unloading devices
, ✔✔What is the purpose of a tripper? - ✔✔A tripper allows the discharge of material at
any point along the length of the conveyor.
✔✔What is required to permit the conveyor to operate efficiently with a constant load? -
✔✔A constant uniform feed. Feeder belts are a lot wider than regular conveyor belts
and tend to be flat. The belt may have a raised edge to prevent side spillage.
✔✔What are the three main components of a conventional multi-ply belt? - ✔✔The Top
cover, the Carcass, and the Bottom cover (pulley cover). Other components include the
Ply, Wrap, Fill, Friction, Skim coat, and Breaker fabric.
✔✔What is the portion of the belt that carries the load and tension? - ✔✔The Carcass
✔✔What are three types of joining methods for belts? - ✔✔Mechanical fasteners, cold
self splicing, hot vulcanized splicing.
✔✔What type of fastener would be best suited for small repairs or tears to a belt? -
✔✔A bolted plate (double plate)
✔✔How much belt strength does hot vulcanizing retain? - ✔✔About 85-90%
✔✔What type of pulley is required with a steel core belt? - ✔✔Smooth pulley
✔✔What type of pulley is used to prevent material buildup between belt and pulley? -
✔✔A self cleaning pulley or wing pulley
✔✔What is a pintle chain and what classes do they come in? - ✔✔Each link is a one
piece casting of malleable iron with both barrel and side bars. The sidebars are offset
from the barrel to the width greater than that of the barrel. It comes in 400 and 700
series, the latter being a longer pitch, heavier duty chain used for conveying.
✔✔What is an H-class mill chain, and what range of pitches are commonly used? -
✔✔This is the same design as the pintle, but it has heavier construction and flanged
wearing shoes cast onto the bottom surface for applications with abrasive materials.
The pitch generally ranges from 1.654 inches to 4 inches.
✔✔What pitches are commonly found on a drag or refuse chain? - ✔✔5 to 12 inches. It
is commonly used in the lumber, cement, and Pulp and Paper Industries where it
conveys sawdust or hog fuel.
✔✔What is a detachable chain and what is its application? - ✔✔This chain is one of the
simplest chain drives because it requires no special tools to assemble or disassemble.
