CWEA Mechanical Technologist Grade 3
Study Guide Comprehensive Resource To Help You Ace
2026-2027 Exams Includes Frequently Tested Questions
With ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
Instant Download Pdf
1. What is a pump?
A. A device used to compress gases only
B. A device that moves solids by gravity
C. A device that moves a fluid by mechanical action
D. A container used for storing liquids
Correct Answer: C. A device that moves a fluid by mechanical action
2. What does the term arc length refer to in arc welding?
A. Length of the welding rod
B. Distance between electrode holder and ground clamp
C. Distance from the end of the electrode to the work surface
D. Length of the weld bead
Correct Answer: C. Distance from the end of the electrode to the work
surface
3. In DC straight polarity (stick welding), what is correct?
A. Work negative, electrode positive
B. Work positive, electrode negative
C. Both positive
D. Both negative
Correct Answer: B. Work positive, electrode negative
4. What safety precaution is required when chipping slag after stick welding?
A. Turn off welding machine
B. Wear rubber gloves
C. Protect against flying debris
, D. Cool weld with water
Correct Answer: C. Protect against flying debris
5. The tungsten electrode used in TIG welding is:
A. Consumable filler metal
B. Non-consumable electrode
C. Used only for aluminum
D. Used as grounding rod
Correct Answer: B. Non-consumable electrode
6. What shielding gas is commonly used for penetrating welds on steel in MIG
welding?
A. Oxygen
B. Argon only
C. Carbon dioxide
D. Nitrogen
Correct Answer: C. Carbon dioxide
7. When plasma cutting, what air quality is required?
A. Moist air
B. Heated air
C. Clean, dry air
D. Compressed nitrogen only
Correct Answer: C. Clean, dry air
8. What is pressure head?
A. Flow rate of water
B. Energy in water due to pressure
C. Height of pump
D. Pipe friction loss
Correct Answer: B. Energy in water due to pressure
9. What is the most common cause of bearing failure?
A. Overheating
B. Contamination entering the bearing
C. Excess lubrication
, D. High RPM
Correct Answer: B. Contamination entering the bearing
10.A pump that becomes noisy and vibratory is most likely experiencing:
A. Overheating
B. Cavitation
C. Low voltage
D. Air lock
Correct Answer: B. Cavitation
11.An air compressor delivering below capacity is most likely caused by:
A. High pressure
B. Worn or broken valves
C. Loose wiring
D. Over lubrication
Correct Answer: B. Worn or broken valves
12.Friction is defined as:
A. Pressure loss in pipes
B. Resistance of motion between surfaces in contact
C. Heat produced by motors
D. Electrical resistance
Correct Answer: B. Resistance of motion between surfaces in contact
13.Cavitation in a centrifugal pump is usually caused by restriction of:
A. Discharge piping
B. Suction piping
C. Electrical supply
D. Motor bearings
Correct Answer: B. Suction piping
14.A centrifugal pump that sounds like it is pumping rocks is:
A. Overloaded
B. Air bound
C. Cavitating
D. Running dry
Correct Answer: C. Cavitating
, 15.Which pump type always requires priming?
A. Gear pump
B. Diaphragm pump
C. Centrifugal pump
D. Piston pump
Correct Answer: C. Centrifugal pump
16.What two factors define rated pump capacity?
A. Voltage and amperage
B. Gallons per minute and pressure head
C. Pipe size and flow
D. Horsepower and RPM
Correct Answer: B. Gallons per minute and pressure head
17.Closing the discharge valve on a centrifugal pump will:
A. Increase motor amps
B. Decrease motor amps
C. Stop the motor
D. Increase flow
Correct Answer: B. Decrease motor amps
18.What commonly trips a circuit breaker on a centrifugal sewage pump?
A. Low voltage
B. Cavitation
C. Debris binding the pump
D. Air in discharge line
Correct Answer: C. Debris binding the pump
19.A worn impeller will cause energy use to:
A. Decrease
B. Stay the same
C. Increase
D. Stop
Correct Answer: C. Increase
20.What is an advantage of a split mechanical seal?
A. Cheaper operation
Study Guide Comprehensive Resource To Help You Ace
2026-2027 Exams Includes Frequently Tested Questions
With ELABORATED 100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
Instant Download Pdf
1. What is a pump?
A. A device used to compress gases only
B. A device that moves solids by gravity
C. A device that moves a fluid by mechanical action
D. A container used for storing liquids
Correct Answer: C. A device that moves a fluid by mechanical action
2. What does the term arc length refer to in arc welding?
A. Length of the welding rod
B. Distance between electrode holder and ground clamp
C. Distance from the end of the electrode to the work surface
D. Length of the weld bead
Correct Answer: C. Distance from the end of the electrode to the work
surface
3. In DC straight polarity (stick welding), what is correct?
A. Work negative, electrode positive
B. Work positive, electrode negative
C. Both positive
D. Both negative
Correct Answer: B. Work positive, electrode negative
4. What safety precaution is required when chipping slag after stick welding?
A. Turn off welding machine
B. Wear rubber gloves
C. Protect against flying debris
, D. Cool weld with water
Correct Answer: C. Protect against flying debris
5. The tungsten electrode used in TIG welding is:
A. Consumable filler metal
B. Non-consumable electrode
C. Used only for aluminum
D. Used as grounding rod
Correct Answer: B. Non-consumable electrode
6. What shielding gas is commonly used for penetrating welds on steel in MIG
welding?
A. Oxygen
B. Argon only
C. Carbon dioxide
D. Nitrogen
Correct Answer: C. Carbon dioxide
7. When plasma cutting, what air quality is required?
A. Moist air
B. Heated air
C. Clean, dry air
D. Compressed nitrogen only
Correct Answer: C. Clean, dry air
8. What is pressure head?
A. Flow rate of water
B. Energy in water due to pressure
C. Height of pump
D. Pipe friction loss
Correct Answer: B. Energy in water due to pressure
9. What is the most common cause of bearing failure?
A. Overheating
B. Contamination entering the bearing
C. Excess lubrication
, D. High RPM
Correct Answer: B. Contamination entering the bearing
10.A pump that becomes noisy and vibratory is most likely experiencing:
A. Overheating
B. Cavitation
C. Low voltage
D. Air lock
Correct Answer: B. Cavitation
11.An air compressor delivering below capacity is most likely caused by:
A. High pressure
B. Worn or broken valves
C. Loose wiring
D. Over lubrication
Correct Answer: B. Worn or broken valves
12.Friction is defined as:
A. Pressure loss in pipes
B. Resistance of motion between surfaces in contact
C. Heat produced by motors
D. Electrical resistance
Correct Answer: B. Resistance of motion between surfaces in contact
13.Cavitation in a centrifugal pump is usually caused by restriction of:
A. Discharge piping
B. Suction piping
C. Electrical supply
D. Motor bearings
Correct Answer: B. Suction piping
14.A centrifugal pump that sounds like it is pumping rocks is:
A. Overloaded
B. Air bound
C. Cavitating
D. Running dry
Correct Answer: C. Cavitating
, 15.Which pump type always requires priming?
A. Gear pump
B. Diaphragm pump
C. Centrifugal pump
D. Piston pump
Correct Answer: C. Centrifugal pump
16.What two factors define rated pump capacity?
A. Voltage and amperage
B. Gallons per minute and pressure head
C. Pipe size and flow
D. Horsepower and RPM
Correct Answer: B. Gallons per minute and pressure head
17.Closing the discharge valve on a centrifugal pump will:
A. Increase motor amps
B. Decrease motor amps
C. Stop the motor
D. Increase flow
Correct Answer: B. Decrease motor amps
18.What commonly trips a circuit breaker on a centrifugal sewage pump?
A. Low voltage
B. Cavitation
C. Debris binding the pump
D. Air in discharge line
Correct Answer: C. Debris binding the pump
19.A worn impeller will cause energy use to:
A. Decrease
B. Stay the same
C. Increase
D. Stop
Correct Answer: C. Increase
20.What is an advantage of a split mechanical seal?
A. Cheaper operation
