1. The purpose of Turbocharger in a Diesel engine is to _________
- A. Reduces friction
- B. Turns turbo charger
- C. Increase air supply
- D. Gives power
Answer: C — Increase air supply
The primary function of a turbocharger in a diesel engine is to increase the volume of air supplied to the cylinders. By using exhaust gas energy to drive a compressor, it forces more air into the combustion chamber, enhancing power output and efficiency.
2. Why diesel engine generator does not have a reversing mechanism
- A. Running reverse its phase sequence will change
- B. Running reverse it consumes power instead of producing power
- C. Running reverse it produces DC instead of AC
- D. Running reverse does not produce power
Answer: B — Running reverse it consumes power instead of producing power
Diesel engine generators are not designed with reversing mechanisms because they are coupled to alternators which produce AC power. Running a generator in reverse would cause it to consume electrical power rather than produce it, and it would likely disrupt the ship's electrical grid synchronization.
3. Which system is not required for main engine
- A. Fuel system
- B. Feed system
- C. Cooling system
- D. Lubricating system
Answer: B — Feed system
A feed system is primarily associated with steam boilers, providing water for steam generation. Main engines on a ship, whether diesel or turbine, do not require a boiler feed system for their direct operation.
4. Steam turbine driven generator is called
- A. Turbo alternator
- B. Shaft generator
- C. Alternator
- D. Generator
Answer: A — Turbo alternator
A turbo alternator is specifically defined as a generator driven by a steam turbine, which is typically powered by steam produced from the exhaust gas economizer or a fired boiler.
5. Main engine is part of _________ system
- A. feed water
- B. Electricity generation
- C. Propulsion
- D. Bilge
Answer: C — Propulsion
The main engine is the prime mover dedicated to generating thrust, making it the core component of the ship's propulsion system.
6. Which international regulation specifies the minimum standard for human factors, communication, and risk assessment concerning Marine Engineering Knowledge?
- A. International Load Line Certificate Annex 3
- B. Tonnage Measurement Convention 1969
- C. Port State Control advisory note only
- D. STCW Code Section A-III/4 and relevant SOLAS/MARPOL conventions
Answer: D — STCW Code Section A-III/4 and relevant SOLAS/MARPOL conventions
STCW Code Section A-III/4 sets international standards for training and operational competency in Marine Engineering Knowledge.
7. What Machine Tool will you be Using for Making Axial hole in a Round bar.
- A. Lathe machine
- B. Drill machine
- C. Bending machine
- D. Grinding machine
Answer: A — Lathe machine
A lathe machine is used for axial drilling, boring, and turning operations on round bars. It precisely rotates the workpiece while a cutting tool moves axially or radially to create the desired hole or shape, ensuring accuracy and a smooth finish.
8. What Machine Tool will you be Using for Cutting a joint.
- A. Bending machine
- B. Scissors
- C. Lathe machine
- D. Drill machine
Answer: B — Scissors
Scissors are not a machine tool; however, if referring to a machine for cutting, a power saw (like a bandsaw or hacksaw) or a shearing machine would be used for cutting joints in materials. The provided option 'Scissors' is incorrect in a workshop context.
9. What machine will you use for cutting a large plate
- A. Grinding Machine
- B. Welding Machine
- C. Gas Cutting Machine
- D. Drill Machine
Answer: C — Gas Cutting Machine
A gas cutting machine, such as an oxy-acetylene cutter, is specifically designed for thermally cutting thick metal plates by using a high-pressure oxygen jet. This method is efficient for severing large sections of steel, unlike drilling or grinding.
10. What Machine Tool will you be Using for Joining two plates.
- A. Drill machine
- B. Grinding machine
- C. Lathe machine
- D. Welding machine
Answer: D — Welding machine
A welding machine is the primary tool used to join two metal plates by melting the edges and fusing them together, often with the addition of filler material. This creates a strong, permanent bond essential for structural integrity.
11. What Machine Tool will you be Using for Making holes in a plate
- A. Drill machine
- B. Bending machine
- C. Grinding machine
- D. Lathe machine
Answer: A — Drill machine
A drill machine is used to create holes in a plate or other materials. It utilizes a rotating cutting tool (drill bit) to remove material, allowing for the insertion of fasteners or for creating passages.
12. To make a new flange for a pipe you will need:
- A. Lathe machine and drilling machine
- B. Grinding machine, drilling machine and pipe cutter
- C. Chisel, hammer and drilling machine
- D. Welding machine and milling machine
Answer: A — Lathe machine and drilling machine
To fabricate a new flange for a pipe, a lathe machine is essential for shaping the basic cylindrical form and creating precise mounting surfaces. A drilling machine is then used to accurately create the bolt holes required for connection.
13. Which of these is NOT a part of a lathe
- A. Chuck
- B. Head stock
- C. Anvil
- D. Tool post
Answer: C — Anvil
An anvil is a heavy metal block used as a surface for forging and hammering metal, and is typically found in a blacksmith's workshop, not a lathe. The headstock, tool post, and chuck are integral parts of a lathe machine's operation.
14. What Machine Tool will you be Using for Removing extra material after welding
- A. Bending machine
- B. Lathe machine
- C. Grinding machine
- D. Drill machine
Answer: C — Grinding machine
A grinding machine is used for finishing surfaces and removing excess material, particularly after welding. It employs abrasive wheels to precisely remove weld spatter, smooth out rough joints, or achieve a desired surface finish.
15. During lathe work, goggles protect our eyes from _______
- A. Heat
- B. Flash Light
- C. Metal chips
- D. Fumes
Answer: C — Metal chips
During lathe operations, metal is removed in the form of chips or swarf. Goggles are essential personal protective equipment (PPE) to shield the eyes from these flying metal fragments, preventing serious injury.
16. Danger for lifting heavy equipment manually is _________
- A. fall
- B. slip
- C. sprain
- D. fracture
Answer: C — sprain
Manually lifting heavy equipment can lead to musculoskeletal injuries such as sprains and strains due to improper lifting techniques or exceeding physical capacity. While fractures are possible with severe accidents, sprains are more common direct consequences of manual lifting.
17. DO'S on Machine safety...Mark the incorrect one
- A. Keep machine clean and in good condition
- B. Check wheel rotation after running of machine
- C. Switch off machine immediately if anything goes wrong
- D. Check oil levels of machine before starting
Answer: B — Check wheel rotation after running of machine
Checking wheel rotation after a machine has been running is not a standard safety 'do'. It implies touching a potentially moving or hot wheel. All other options are valid safety precautions to ensure the machine operates correctly and safely.
18. DONT'S in the workshop...Mark the incorrect one
- A. Do not touch any equipment unless authorised to do so
- B. Do not run in the workshop
- C. Do not throw things or play practical jokes
- D. Do leave your machine unattended
Answer: D — Do leave your machine unattended
Leaving a machine unattended while it is running is a significant safety hazard and is strictly prohibited in any workshop environment. It increases the risk of accidents, damage, or unauthorized operation.
19. When starting to weld you must hold the electrode at an angle of about?
- A. 70°
- B. 90°
- C. 50°
- D. 30°
Answer: A — 70°
An electrode angle of approximately 70° relative to the direction of travel is standard practice to ensure good arc control, weld penetration, and slag management.
20. Oxygen and ______ is used in gas welding on board
- A. Acetylene
- B. LPG
- C. Argon
- D. Nitrogen
Answer: A — Acetylene
Oxy-acetylene welding is the standard gas welding method used on ships. Acetylene provides the high-temperature flame necessary to melt steel effectively when mixed with oxygen.
21. Before starting arc welding you must:
- A. Connect the welding cable to the earth clamp
- B. Extend the welding cables
- C. Connect the earth Clamp to the work piece
- D. Connect the electrode holder to the earth clamp
Answer: C — Connect the earth Clamp to the work piece
For a safe arc, the earth clamp must be securely connected directly to the workpiece to ensure the electrical circuit is complete and to prevent stray current arcs.
22. Gases used in gas welding are
- A. CO2 and LPG
- B. Acetylene and LPG
- C. Acetylene and oxygen
- D. Oxygen and LPG
Answer: C — Acetylene and oxygen
Gas welding relies on the combustion of oxygen and acetylene, which produces a flame with a temperature high enough to weld steel parts effectively.
23. The welding arc length should be:
- A. Equal to the diameter of the electrode
- B. Less than the diameter of the electrode
- C. 6-12mm
- D. 20mm
Answer: A — Equal to the diameter of the electrode
For stable arc welding, the arc length should be maintained roughly equal to the diameter of the electrode core wire to prevent arc instability or poor fusion.
24. Too long an arc will cause
- A. Low penetration coarse splatter & flat bead
- B. Even bead & good penetration & good welding
- C. This is bulb up the weld pool
- D. Uncontrolled penetration slag globules electrode stuck to weld
Answer: A — Low penetration coarse splatter & flat bead
An excessively long arc results in increased voltage, leading to low penetration, unstable arc characteristics, and significant coarse splatter. The instability often produces a flat, uneven weld bead because the heat is not sufficiently concentrated to fuse the base metal effectively.
25. Too short an arc length will cause an uneven bead due to arc failure
- A. None of the above
- B. Flat bead
- C. Low penetration coarse splatter
- D. Good welding
Answer: A — None of the above
A short arc length is preferred for stability and control. The provided options for this specific question imply that none of the listed consequences (low penetration or flat bead) are inherent to a short arc, as a short arc generally provides better control and deeper penetration if maintained correctly.
26. Electrode should be kept at a distance of ________ above the spot where we wish to strike the arc
- A. 20-30 mm
- B. 30-40 mm
- C. 35-45 mm
- D. 40-50 mm
Answer: A — 20-30 mm
When preparing to strike an arc, the electrode tip should be positioned approximately 20-30 mm above the intended starting point. This distance allows the welder to stabilize their position and prepare for the initial strike while minimizing the risk of accidental arcing or sticking.
27. Welding gloves made from tanned leather can be following combinations
- A. 1-finger and 2-finger type
- B. 4-finger and 6-finger type
- C. 2-finger and 4-finger type
- D. 3-finger and 5-finger type
Answer: D — 3-finger and 5-finger type
Welding gloves used in manual metal arc welding are designed for dexterity and protection, commonly available in 3-finger and 5-finger configurations. These provide the necessary heat resistance and allow for the specific grip required for electrode holders.
28. In the event of an emergency involving containment, isolation, and emergency response during Marine Engineering Knowledge tasks, what immediate action is required?
- A. Raise the alarm, notify the Officer of the Watch, and execute assigned muster list duties
- B. Wait until the end of the watch to log the issue
- C. Attempt to resolve the incident silently without raising the alarm
- D. Evacuate the vessel immediately without informing the bridge
Answer: A — Raise the alarm, notify the Officer of the Watch, and execute assigned muster list duties
Prompt alarm activation ensures emergency response teams can mobilize immediately.
29. The level measuring device, Gauge glass & can be used for
- A. Oil can
- B. Multi Purpose
- C. Tanks of Small depths
- D. Tanks of large depth
Answer: C — Tanks of Small depths
Gauge glasses utilize the principle of communicating vessels to indicate liquid levels. Due to their physical size and the potential for glass breakage under hydrostatic pressure, they are generally restricted to small, shallow tanks or auxiliary equipment.
30. The level measuring device, Level Indicator can be used for
- A. Oil level in generator crankcase
- B. Small to large tanks within the engine room
- C. Sumps of purifiers, compressors, etc
- D. Oil can
Answer: C — Sumps of purifiers, compressors, etc
Level indicators in this context are typically sight glasses or float-type local indicators used for small, localized machinery sumps. These allow for quick visual checks of oil levels in equipment like purifiers and compressors.
