CHEMCO exit exam questions and answers — Set 6

1. Normally what is the discharge capacity of Framo portable pumps?

• A. 150 cubic meter per hour
• B. 100 cubic meter per hour
• C. 70 cubic meter per hour
• D. 200 cubic meter per hour

2. In a centrifugal pump:

• A. The discharge side has a negative pressure.
• B. The fluid moves in a direction opposite to the impeller.
• C. The fluid moves in the same direction as the impeller.
• D. The width of the discharge pipeline decreases outwards.

3. Where is cofferdam in Framo pumps?

• A. On the cargo pump side of the seal
• B. On the hydraulic motor side of the seal
• C. On both pump and motor side of the seal
• D. Not on the pump end or the motor end

4. Bernoulli’s principle states that:

• A. pressure (P) x height (H) is a constant
• B. height (H) x velocity (V) is a constant
• C. pressure (P) x velocity (V) is a constant
• D. pressure (P) x density (D) is a constant

5. How the speed of the portable pump can be varied?

• A. Portable pump speed cannot be varied
• B. Using the flow control valve of the main cargo pump
• C. By varying the speed of the feed pump
• D. The portable pump is always rigged with its own flow control valve which is used for speed variation

6. What kind of pumps can move extremely thick fluids like sludge without clogging ?

• A. Rotary vane pumps
• B. Reciprocating pumps
• C. Deep well pumps
• D. Screw pumps

7. What is the pressure of the hydraulic oil in the inlet side for running the hydraulic motor?

• A. Around 50 Bar
• B. Around 170 bar
• C. Around 100 bar
• D. Around 25 bar

8. The reciprocating pump creates a suction effect when there is a

• A. decrease in pressure
• B. increase in pressure
• C. no change in pressure
• D. decrease or an increase in pressure

9. What happens within the hull girder due to the development of bending moment due to stresses on hull are the following: find a statement that provides structural strength to the hull girder

• A. A bending stress is developed at every transverse section of the hull.
• B. The universal expression for bending stress is:bending stress = (bendingmoment)/(section modulus)
• C. Maximum bending moment at the midship means that the bending stress at the midships will be the maximum, and hence the deciding factor for the design.
• D. The bending stress at the midship is kept within safe limits by designing the midship section with a sufficient section modulus.

10. When doing an enclosed space rescue, the person in charge must co- ordinate the rescue:

• A. From inside the space
• B. From the Bridge
• C. From outside the space
• D. From the Engine Control Room

11. Select the correct statement.

• A. A tanker with a defective oil discharge monitoring and control system may undertake one ballast voyage before proceeding to a repair port, under certain circumstances.
• B. A tanker with a defective oil discharge monitoring and control system cannot undertake a ballast voyage.
• C. A tanker with a defective oil discharge monitoring and control system need only repair the system before the next annual MARPOL survey of the IOPP Certificate.
• D. A tanker with a defective oil discharge monitoring and control system may undertake one ballast voyage and one loaded voyage before proceeding to a repair port, provided permission is taken from the relevant authority.

12. Control of Entry into Enclosed Spaces; identify the most important statement which is a key measure to safe entry

• A. Prior to entry into an enclosed space, a risk assessment should be completed to identify the potential hazards and to determine the safeguards to be adopted.
• B. The safe working practice should be documented and approved by the responsible officer before being countersigned by the master, who confirms that the practice is safe and in compliance with the ship’s Safety Management System.
• C. The permit, or other enabling document, should be sighted and completed by the person entering the space, prior to entry.
• D. The controls required for safe entry vary with the task being performed and the potential hazards identified during the risk assessment.

13. Lung inflammation will cause:

• A. Breathlessness and drowsiness
• B. Breathlessness and confusion
• C. Breathlessness and a dry cough
• D. Breathlessness and slurred speech

14. The Convention that allows States to intervene in a pollution incident at sea is the

• A. MARPOL Convention
• B. SOLAS Convention
• C. CLC Convention
• D. Intervention Convention

15. Emergency alarm signals are provided on tankers in case of the following; which one of these alarms will be of major importance on a double-hull tankship with empty ballast tanks?

• A. High concentration of toxic or flammable vapors
• B. A discharge in engine-room or pumproom
• C. When level of oxygen in inert gas entering tanks exceeds 5%
• D. High level of oil residues in overboard discharge

16. While in port, if a fire occurs on board ship, support available from the shore includes the following; which one, in your opinion, makes the most important distinction for a shipboard fire?

• A. Assistance from the fire brigade – experienced manpower and firefighting equipment.
• B. Medical services of shore hospitals including ambulances with stretchers and paramedics in attendance, helicopters, etc.
• C. Transportation for evacuating personnel from ship that are non-essential for firefighting.
• D. Catering services where ship’s resources are restricted by the fire.

17. Typical Locations for High Sensitivity to Fatigue Failure The following areas are considered to be prone to fatigue failure on double hull oil tankers: which one is the most common

• A. Side shell area below the load and ballast waterlines. These areas are subjected to the highest cycle loading through the ship’s life due to the passage of waves along the side of the ship.
• B. Deck plating at connection to primary supporting members.
• C. Connection between transverse bulkheads to the upper and lower bulkhead stools.
• D. Connection between lower hopper sloping plating and inner bottom plating.

18. Safeguards for Enclosed Space Entry; Before allowing access to the space, the responsible officer should ensure, amongst other things, that: identify the most important of all the elements

• A. The personal protective equipment to be used by people entering the enclosed space must be prescribed.
• B. Approved safety torches.
• C. Approved UHF radio.
• D. Personal gas detector or an area gas detector and alarm.

19. In case of a collision, the following, amongst other steps are considered as a general plan of action; which one will be a priority in case of an underwater hull damage?

• A. Assessing possible pollution due to rupture of fuel and or cargo (oil or chemical) tanks;
• B. Taking corrective action to minimize the quantum of pollution; reporting the incident.
• C. Assembling the emergency party.
• D. Preparing for or implementing fire-fighting measures (in the event of a fire).

20. The Medical First Aid Guide is published by the:

• A. International Maritime Organisation
• B. World Health Organisation
• C. United Nations
• D. International Labour Organisation

21. Find a statement that in your opinion, is the most critical in a grounding incident?

• A. Grounding can cause loss of human life.
• B. Grounding can cause harmful environmental impact, especially in the case where large tanker ships are involved.
• C. Grounding can cause financial consequences to local communities close to the accident.
• D. Grounding can cause financial consequences to ship- owners, due to ship loss or penalties.

22. Safeguards for Enclosed Space Entry; Before allowing access to the space, the responsible officer should ensure, amongst other things, that: identify the most important of all the elements

• A. A rescue harness, complete with lifeline, is ready for immediate use at the entrance to the space.
• B. Fully charged safety torch is ready for immediate use at the entrance to the space.
• C. A responsible member of the crew is in constant attendance outside the enclosed space, in the immediate vicinity of the entrance and in direct contact with a responsible officer.
• D. These persons should be trained in the actions to be taken in the event of an emergency.

23. Statements on Boiler: identify a statement that supports the use of a watertube boiler with a superheater in many tanker vessels?

• A. The boiler on a tanker vessel is equally important as the main propulsion engines
• B. On a large oil tanker, the fuel consumption in the boiler could be as high as 2/3rd of the engines.
• C. Without having steam at superheated condition, you may not be able to operate the cargo pump turbines efficiently and safely
• D. Without having steam, you may not be able to maintain the oil temperatures correctly within the cargo tanks for discharging.

24. Which function is NOT provided by the scrubber of an inert gas system?

• A. Cools the inert gas.
• B. Removes particulate matter like soot.
• C. Maintains gas pressure in the tanks.
• D. Removes chemical impurities from the gas.

25. Introducing inert gas into a tank already inert with the object of further reducing the oxygen or hydrocarbon content to prevent combustion if air enters the tank is called

• A. purging
• B. gas freeing
• C. gas dispersion
• D. bonding

26. Typically nitrogen contained in inert gas generated from boiler flue gas, at the scrubber outlet is

• A. 50%
• B. 60%
• C. 70%
• D. 83%

27. Which statement about inert gas pressures in a cargo tank is TRUE?

• A. The pressures of the inert gas in the tank may create excessive pressure at the pump while discharging.
• B. Gas pressures should be maintained at the highest permissible level throughout the discharging process.
• C. High gas pressures may cause pyrophoric oxidation in the tank.
• D. High gas pressures may cause loss of suction when stripping.

28. The purpose of the deck seal in an inert gas system is to prevent

• A. flammable vapors from entering machinery space
• B. flue gas escaping to atmosphere
• C. inert gas escaping to atmosphere
• D. air entering inert gas system

29. After the initial cleaning of flue gas in an inert gas system the gas is passed through what device for final cleaning?

• A. Scrubber
• B. Demister
• C. Deck water seal
• D. Final filter

30. The "flammable limits" of an atmosphere are the

• A. two temperatures between which an atmosphere will self ignite
• B. upper and lower percentage of vapor concentrations in an atmosphere which will burn if an ignition source is present
• C. upper and lower pressures between which an atmosphere will not burn
• D. two temperatures between which an atmosphere will burn if an ignition source is present