CWEA Mechanical Technologist
Grade 2 Exam Newest 2025- 2026
Update 200 Questions & 100% Correct
Answer
Most Tested Content Areas
• Pump operation, troubleshooting & calculations
• Bearings, lubrication & mechanical seals
• Hydraulic principles & flow formulas
• Preventive & predictive maintenance
• Motors, couplings & alignment
• Valve operation & applications
• Safety procedures (LOTO, confined space)
• Rigging & lifting practices
• Blueprint reading & symbols
• Wastewater mechanical system maintenance
,1. The device used to convert mechanical energy into hydraulic energy in a
wastewater system is a __________.
Pump
Explanation: A pump adds energy to a fluid, increasing pressure
and flow.
2. The formula used to calculate brake horsepower (BHP) is: BHP = (Flow ×
Head) ÷ (__________ × Efficiency).
3960
Explanation: 3960 is the conversion constant when flow is in GPM
and head is in feet.
3. The component that prevents leakage along a rotating shaft in a pump is
called a __________.
Mechanical seal
Explanation: Mechanical seals prevent fluid leakage where the
shaft exits the casing.
4. Excessive vibration in rotating equipment is most commonly caused by
misalignment or __________.
Imbalance
Explanation: Imbalance occurs when rotating mass is unevenly
distributed.
5. The process of securing energy sources before maintenance is known as
__________.
, Lockout/Tagout
Explanation: LOTO prevents accidental energization of equipment.
6. A bearing that supports radial loads using rolling elements is called a
__________ bearing.
Ball
Explanation: Ball bearings are designed primarily for radial loads.
7. The unit used to measure pressure in most wastewater mechanical systems
is __________.
PSI
Explanation: Pounds per square inch measures pressure.
8. Cavitation in a pump occurs when pressure drops below the liquid’s
__________ pressure.
Vapor
Explanation: When pressure falls below vapor pressure, bubbles
form and collapse.
9. The alignment method using two dial indicators measures both offset and
__________ misalignment.
Angular
Explanation: Angular misalignment occurs when shafts are not
parallel.
, 10.The purpose of a check valve is to prevent __________.
Backflow
Explanation: Check valves allow flow in only one direction.
11.The formula for velocity in a pipe is V = Q ÷ __________.
Area
Explanation: Velocity equals flow divided by cross-sectional area.
12.A lubricant’s primary purpose in bearings is to reduce __________.
Friction
Explanation: Lubrication minimizes metal-to-metal contact.
13.The most common material used for pump shafts is __________ steel.
Stainless
Explanation: Stainless steel resists corrosion in wastewater
environments.
14.The device used to safely lift heavy mechanical equipment is a __________
hoist.
Chain
Explanation: Chain hoists are commonly used in treatment
facilities.
15.A gate valve is primarily used for __________ service.
On/off
Explanation: Gate valves are not designed for throttling.
Grade 2 Exam Newest 2025- 2026
Update 200 Questions & 100% Correct
Answer
Most Tested Content Areas
• Pump operation, troubleshooting & calculations
• Bearings, lubrication & mechanical seals
• Hydraulic principles & flow formulas
• Preventive & predictive maintenance
• Motors, couplings & alignment
• Valve operation & applications
• Safety procedures (LOTO, confined space)
• Rigging & lifting practices
• Blueprint reading & symbols
• Wastewater mechanical system maintenance
,1. The device used to convert mechanical energy into hydraulic energy in a
wastewater system is a __________.
Pump
Explanation: A pump adds energy to a fluid, increasing pressure
and flow.
2. The formula used to calculate brake horsepower (BHP) is: BHP = (Flow ×
Head) ÷ (__________ × Efficiency).
3960
Explanation: 3960 is the conversion constant when flow is in GPM
and head is in feet.
3. The component that prevents leakage along a rotating shaft in a pump is
called a __________.
Mechanical seal
Explanation: Mechanical seals prevent fluid leakage where the
shaft exits the casing.
4. Excessive vibration in rotating equipment is most commonly caused by
misalignment or __________.
Imbalance
Explanation: Imbalance occurs when rotating mass is unevenly
distributed.
5. The process of securing energy sources before maintenance is known as
__________.
, Lockout/Tagout
Explanation: LOTO prevents accidental energization of equipment.
6. A bearing that supports radial loads using rolling elements is called a
__________ bearing.
Ball
Explanation: Ball bearings are designed primarily for radial loads.
7. The unit used to measure pressure in most wastewater mechanical systems
is __________.
PSI
Explanation: Pounds per square inch measures pressure.
8. Cavitation in a pump occurs when pressure drops below the liquid’s
__________ pressure.
Vapor
Explanation: When pressure falls below vapor pressure, bubbles
form and collapse.
9. The alignment method using two dial indicators measures both offset and
__________ misalignment.
Angular
Explanation: Angular misalignment occurs when shafts are not
parallel.
, 10.The purpose of a check valve is to prevent __________.
Backflow
Explanation: Check valves allow flow in only one direction.
11.The formula for velocity in a pipe is V = Q ÷ __________.
Area
Explanation: Velocity equals flow divided by cross-sectional area.
12.A lubricant’s primary purpose in bearings is to reduce __________.
Friction
Explanation: Lubrication minimizes metal-to-metal contact.
13.The most common material used for pump shafts is __________ steel.
Stainless
Explanation: Stainless steel resists corrosion in wastewater
environments.
14.The device used to safely lift heavy mechanical equipment is a __________
hoist.
Chain
Explanation: Chain hoists are commonly used in treatment
facilities.
15.A gate valve is primarily used for __________ service.
On/off
Explanation: Gate valves are not designed for throttling.
