CWEA CERTIFICATION MECHANICAL TECHNOLOGIST GRADE
1 EXAM STUDY GUIDE QUESTIONS WITH COMPLETE
SOLUTIONS
Which welding process is most commonly used for small pipe maintenance welding? --
Answer ✔✔ Oxyacetylene gas welding
What types of jobs would you need Shielded metal-arc welding for? -- Answer ✔✔
Constructing pipelines, tanks, industrial construction, structures
What types of jobs do you need Gas metal-arc welding for? -- Answer ✔✔ Deep groove
welding, automotive repair, manufacturing heavy equipment
What types of jobs do you use Gas tungsten-arc welding for? -- Answer ✔✔ Thin
sections of stainless steel and other precise jobs dealing with dissimilar metals
What is wet stacking and how can it be prevented? -- Answer ✔✔ It is unburned fuel
collecting in the exhaust due to light or no load conditions.
To check flywheel face turnout, where should the dial indicator be positioned? --
Answer ✔✔ The base on the well housing and the pointer on the flywheel face.
,What issues arise with excessive flywheel face turnout? -- Answer ✔✔ Excessive runout
can lead to uneven pressure distribution on the clutch disc, affecting its performance.
Runout causes additional friction and drag, leading to clutch slippage, poor release, and
difficulty shifting gears.
If a 38-tooth gear running at 360 rpm is driving another gear at 144 rpm, what is the
number of teeth on the driven gear? -- Answer ✔✔ 95
Solution: driver Gear x Driver RPM=Driven Gear x Driven RPM38 x 360 = N x
14413,680 = 144N13, = 144N / 14495 = N(95 Tooth Gear
What equation would you use to figure out the rpm of a Gear Driver? -- Answer ✔✔
Gear Driver (number of teeth) x Driver RPM = Driven Gear (number of teeth) x
Driven RPM
Does a sealed ball bearing need to be lubricated? -- Answer ✔✔ It does not need to be
lubricated under normal use
A DAFT is an acronym meaning......... -- Answer ✔✔ Dissolved Air Flotation Thickener
What is the governing agency that permits odor control systems? -- Answer ✔✔
AQMD - Air Quality Management District
At what pressure rating should you use a blower instead of a fan? -- Answer ✔✔ 7 psi
What is the difference between a blower and a fan? -- Answer ✔✔ The main difference
between a blower and a fan is that a fan is an electrical device that moves air, whereas a
blower is a mechanical device that consists of a fan and channels the air from the fan to
a specific location or point. Fans circulate air around an entire room or a large area,
while blowers generate a concentrated, high-pressure airflow aimed at specific
directions or through confined spaces. Another difference is that fans primarily focus on
, producing high-volume airflow at low pressure, while blowers are designed to force air
through targeted areas
What is a globe valve used for? -- Answer ✔✔ Regulate fluid flow, can be throttled up of
down or shut off flow completely
What type of valve is unsuitable for high-pressure flow? -- Answer ✔✔ A needle valve
What is a gate valve used for? -- Answer ✔✔ Gate valves are among the most common
sorts of valves and taps you will find in most pipeline applications for stopping and
starting fluid flow
What is a needle valve used for? -- Answer ✔✔ A needle valve is a type of valve that
uses a tapered needle to control the flow of fluid. It is often used in applications where
precise control of the flow rate is required, such as in laboratory and industrial settings.
The unique feature of the valve is the structure of a small plunger with the shape of a
needle. The plunger features a small handle to operate in the easy and precise operation
of the valve.
Learn more:
What is a ball valve used for? -- Answer ✔✔ A ball valve consists of a hollow,
perforated, and pivoting ball. When the hole through the middle of the ball aligns with
the flow inlet, the valve is open, allowing fluid to pass through. To close the valve, the
ball is pivoted 90 degrees by the valve handle, blocking the flow.
A Sodium hypochlorite tank is full at 23,000 gallons. It's current level is at 1,200 gallons.
How many gallons will the delivery driver need to add in order to bring it to 70%
capacity? -- Answer ✔✔ 14,900 gallons need to be added to the tank in order for it to
be 70% full
What is 100 degrees Celsius in Fahrenheit? -- Answer ✔✔ 212 degrees Fahrenheit
1 EXAM STUDY GUIDE QUESTIONS WITH COMPLETE
SOLUTIONS
Which welding process is most commonly used for small pipe maintenance welding? --
Answer ✔✔ Oxyacetylene gas welding
What types of jobs would you need Shielded metal-arc welding for? -- Answer ✔✔
Constructing pipelines, tanks, industrial construction, structures
What types of jobs do you need Gas metal-arc welding for? -- Answer ✔✔ Deep groove
welding, automotive repair, manufacturing heavy equipment
What types of jobs do you use Gas tungsten-arc welding for? -- Answer ✔✔ Thin
sections of stainless steel and other precise jobs dealing with dissimilar metals
What is wet stacking and how can it be prevented? -- Answer ✔✔ It is unburned fuel
collecting in the exhaust due to light or no load conditions.
To check flywheel face turnout, where should the dial indicator be positioned? --
Answer ✔✔ The base on the well housing and the pointer on the flywheel face.
,What issues arise with excessive flywheel face turnout? -- Answer ✔✔ Excessive runout
can lead to uneven pressure distribution on the clutch disc, affecting its performance.
Runout causes additional friction and drag, leading to clutch slippage, poor release, and
difficulty shifting gears.
If a 38-tooth gear running at 360 rpm is driving another gear at 144 rpm, what is the
number of teeth on the driven gear? -- Answer ✔✔ 95
Solution: driver Gear x Driver RPM=Driven Gear x Driven RPM38 x 360 = N x
14413,680 = 144N13, = 144N / 14495 = N(95 Tooth Gear
What equation would you use to figure out the rpm of a Gear Driver? -- Answer ✔✔
Gear Driver (number of teeth) x Driver RPM = Driven Gear (number of teeth) x
Driven RPM
Does a sealed ball bearing need to be lubricated? -- Answer ✔✔ It does not need to be
lubricated under normal use
A DAFT is an acronym meaning......... -- Answer ✔✔ Dissolved Air Flotation Thickener
What is the governing agency that permits odor control systems? -- Answer ✔✔
AQMD - Air Quality Management District
At what pressure rating should you use a blower instead of a fan? -- Answer ✔✔ 7 psi
What is the difference between a blower and a fan? -- Answer ✔✔ The main difference
between a blower and a fan is that a fan is an electrical device that moves air, whereas a
blower is a mechanical device that consists of a fan and channels the air from the fan to
a specific location or point. Fans circulate air around an entire room or a large area,
while blowers generate a concentrated, high-pressure airflow aimed at specific
directions or through confined spaces. Another difference is that fans primarily focus on
, producing high-volume airflow at low pressure, while blowers are designed to force air
through targeted areas
What is a globe valve used for? -- Answer ✔✔ Regulate fluid flow, can be throttled up of
down or shut off flow completely
What type of valve is unsuitable for high-pressure flow? -- Answer ✔✔ A needle valve
What is a gate valve used for? -- Answer ✔✔ Gate valves are among the most common
sorts of valves and taps you will find in most pipeline applications for stopping and
starting fluid flow
What is a needle valve used for? -- Answer ✔✔ A needle valve is a type of valve that
uses a tapered needle to control the flow of fluid. It is often used in applications where
precise control of the flow rate is required, such as in laboratory and industrial settings.
The unique feature of the valve is the structure of a small plunger with the shape of a
needle. The plunger features a small handle to operate in the easy and precise operation
of the valve.
Learn more:
What is a ball valve used for? -- Answer ✔✔ A ball valve consists of a hollow,
perforated, and pivoting ball. When the hole through the middle of the ball aligns with
the flow inlet, the valve is open, allowing fluid to pass through. To close the valve, the
ball is pivoted 90 degrees by the valve handle, blocking the flow.
A Sodium hypochlorite tank is full at 23,000 gallons. It's current level is at 1,200 gallons.
How many gallons will the delivery driver need to add in order to bring it to 70%
capacity? -- Answer ✔✔ 14,900 gallons need to be added to the tank in order for it to
be 70% full
What is 100 degrees Celsius in Fahrenheit? -- Answer ✔✔ 212 degrees Fahrenheit
