USS Blue Ridge (LCC-19) Enlisted Surface
Warfare Specialist (ESWS) Practice Examination
2026–2027 | Comprehensive 200-Question
Practice Test with Answers & Rationales| Free Pdf
Access.
Engineering Department
1. What is the classification of the Main Reduction Gear (MRG) on the
USS Blue Ridge?
A. Single reduction, single helical, locked train
B. Double reduction, double helical, articulated, non-lock train
C. Double reduction, single helical, articulated, locked train
D. Single reduction, double helical, non-articulated, non-lock train
Correct Answer: B
Explanation: The Main Reduction Gear (MRG) is a critical component of the
ship's propulsion system, designed to reduce the high-speed rotation of the
turbines to an efficient speed for the propeller shafts. It is classified as a
double reduction, double helical, articulated, non-lock train unit.
2. How many line shaft bearings support the main engine shaft on the
USS Blue Ridge?
A. 2
B. 3
C. 4
D. 6
,Correct Answer: C
Explanation: The main engine shaft is supported along its length by line shaft
bearings, which maintain alignment and reduce vibration. The USS Blue
Ridge has four (4) such bearings for its main shaft.
3. What is the primary purpose of the main engine air ejectors?
A. To increase steam pressure for the main turbines.
B. To cool the main condenser.
C. To preheat condensate, remove air and non-condensable gases, and
create a vacuum in the main condenser.
D. To pump lube oil from the sump.
Correct Answer: C
Explanation: The primary function of the main engine air ejectors is to
remove air and other non-condensable gases from the main condenser. This
is essential for maintaining an efficient vacuum, which maximizes the
turbine's thermal efficiency. They also preheat the condensate as part of the
process.
4. What type of lube oil is used in the MRG sump?
A. 9250
B. 2190 TEP
C. MIL-PRF-17672
D. VG 46
Correct Answer: B
Explanation: The lube oil used in the Main Reduction Gear sump is 2190 TEP.
"TEP" stands for Turbine Extreme Pressure, which indicates the oil's
formulation to withstand the high pressures and temperatures found in the
gear system.
5. What are the two criteria for passing a visual lube oil test?
A. Warm and Cool
B. Clear and Bright
C. High and Low
D. Static and Dynamic
,Correct Answer: B
Explanation: A visual inspection of lube oil must meet two criteria: "Clear"
means no visible particles are observed, and "Bright" means there is no free
water present and the sample is not cloudy or hazy. The test is passed if both
conditions are met.
6. What is the total fresh water capacity of the USS Blue Ridge?
A. 123,152 gallons
B. 100,000 gallons
C. 250,000 gallons
D. 75,000 gallons
Correct Answer: A
Explanation: The USS Blue Ridge carries a total fresh water capacity of
123,152 gallons. This potable water is used for a variety of purposes,
including drinking, cooking, and auxiliary systems.
7. What type of air conditioning system is onboard the USS Blue
Ridge?
A. 150-ton reciprocating
B. 250-ton centrifugal York International R-236FA
C. 300-ton screw-type
D. 150-ton centrifugal
Correct Answer: B
Explanation: The ship uses a 250-ton centrifugal air conditioning system
manufactured by York International, which uses R-236FA refrigerant. This is a
large system responsible for cooling vital spaces and crew berthing.
8. What are the three functions of the Pre-Rotation Vane (PRV) in the
A/C plant?
A. Control speed, monitor temperature, and start the compressor.
B. Maintain chilled water outlet temperature, limit motor loading, and
restrict backward refrigerant flow.
C. Pump refrigerant, control pressure, and manage condenser water.
D. Filter air, regulate humidity, and circulate chilled water.
, Correct Answer: B
Explanation: The Pre-Rotation Vanes (PRV) have three main functions in the
centrifugal chiller: 1) Maintaining the desired chilled water outlet
temperature, 2) Limiting motor loading to the desired amperage, and 3)
Restricting backward refrigerant flow on shutdown to prevent damage.
Deck Department
9. What type of anchor does the USS Blue Ridge have?
A. Danforth
B. Navy Standard Stockless
C. Balanced Fluke
D. Mushroom
Correct Answer: B
Explanation: The USS Blue Ridge uses a Navy Standard Stockless anchor. This
design is common on large naval vessels due to its reliability and self-stowing
capability in the hawsepipe.
10. What is the weight of the USS Blue Ridge's anchor?
A. 15,000 lbs
B. 22,500 lbs
C. 30,000 lbs
D. 45,000 lbs
Correct Answer: B
Explanation: The anchor for the USS Blue Ridge is a substantial piece of
equipment, weighing in at 22,500 lbs.
11. What is the length of a standard shot of anchor chain?
A. 10 fathoms
B. 12 fathoms
C. 15 fathoms
D. 20 fathoms
Warfare Specialist (ESWS) Practice Examination
2026–2027 | Comprehensive 200-Question
Practice Test with Answers & Rationales| Free Pdf
Access.
Engineering Department
1. What is the classification of the Main Reduction Gear (MRG) on the
USS Blue Ridge?
A. Single reduction, single helical, locked train
B. Double reduction, double helical, articulated, non-lock train
C. Double reduction, single helical, articulated, locked train
D. Single reduction, double helical, non-articulated, non-lock train
Correct Answer: B
Explanation: The Main Reduction Gear (MRG) is a critical component of the
ship's propulsion system, designed to reduce the high-speed rotation of the
turbines to an efficient speed for the propeller shafts. It is classified as a
double reduction, double helical, articulated, non-lock train unit.
2. How many line shaft bearings support the main engine shaft on the
USS Blue Ridge?
A. 2
B. 3
C. 4
D. 6
,Correct Answer: C
Explanation: The main engine shaft is supported along its length by line shaft
bearings, which maintain alignment and reduce vibration. The USS Blue
Ridge has four (4) such bearings for its main shaft.
3. What is the primary purpose of the main engine air ejectors?
A. To increase steam pressure for the main turbines.
B. To cool the main condenser.
C. To preheat condensate, remove air and non-condensable gases, and
create a vacuum in the main condenser.
D. To pump lube oil from the sump.
Correct Answer: C
Explanation: The primary function of the main engine air ejectors is to
remove air and other non-condensable gases from the main condenser. This
is essential for maintaining an efficient vacuum, which maximizes the
turbine's thermal efficiency. They also preheat the condensate as part of the
process.
4. What type of lube oil is used in the MRG sump?
A. 9250
B. 2190 TEP
C. MIL-PRF-17672
D. VG 46
Correct Answer: B
Explanation: The lube oil used in the Main Reduction Gear sump is 2190 TEP.
"TEP" stands for Turbine Extreme Pressure, which indicates the oil's
formulation to withstand the high pressures and temperatures found in the
gear system.
5. What are the two criteria for passing a visual lube oil test?
A. Warm and Cool
B. Clear and Bright
C. High and Low
D. Static and Dynamic
,Correct Answer: B
Explanation: A visual inspection of lube oil must meet two criteria: "Clear"
means no visible particles are observed, and "Bright" means there is no free
water present and the sample is not cloudy or hazy. The test is passed if both
conditions are met.
6. What is the total fresh water capacity of the USS Blue Ridge?
A. 123,152 gallons
B. 100,000 gallons
C. 250,000 gallons
D. 75,000 gallons
Correct Answer: A
Explanation: The USS Blue Ridge carries a total fresh water capacity of
123,152 gallons. This potable water is used for a variety of purposes,
including drinking, cooking, and auxiliary systems.
7. What type of air conditioning system is onboard the USS Blue
Ridge?
A. 150-ton reciprocating
B. 250-ton centrifugal York International R-236FA
C. 300-ton screw-type
D. 150-ton centrifugal
Correct Answer: B
Explanation: The ship uses a 250-ton centrifugal air conditioning system
manufactured by York International, which uses R-236FA refrigerant. This is a
large system responsible for cooling vital spaces and crew berthing.
8. What are the three functions of the Pre-Rotation Vane (PRV) in the
A/C plant?
A. Control speed, monitor temperature, and start the compressor.
B. Maintain chilled water outlet temperature, limit motor loading, and
restrict backward refrigerant flow.
C. Pump refrigerant, control pressure, and manage condenser water.
D. Filter air, regulate humidity, and circulate chilled water.
, Correct Answer: B
Explanation: The Pre-Rotation Vanes (PRV) have three main functions in the
centrifugal chiller: 1) Maintaining the desired chilled water outlet
temperature, 2) Limiting motor loading to the desired amperage, and 3)
Restricting backward refrigerant flow on shutdown to prevent damage.
Deck Department
9. What type of anchor does the USS Blue Ridge have?
A. Danforth
B. Navy Standard Stockless
C. Balanced Fluke
D. Mushroom
Correct Answer: B
Explanation: The USS Blue Ridge uses a Navy Standard Stockless anchor. This
design is common on large naval vessels due to its reliability and self-stowing
capability in the hawsepipe.
10. What is the weight of the USS Blue Ridge's anchor?
A. 15,000 lbs
B. 22,500 lbs
C. 30,000 lbs
D. 45,000 lbs
Correct Answer: B
Explanation: The anchor for the USS Blue Ridge is a substantial piece of
equipment, weighing in at 22,500 lbs.
11. What is the length of a standard shot of anchor chain?
A. 10 fathoms
B. 12 fathoms
C. 15 fathoms
D. 20 fathoms
