When running TWO centrifugal Pumps in parallel, Flow rate "Q" is increased.
The size of solid particle contaminants in hydraulic systems is measured in:
Which of the following statements is False about hydraulic jacks/tensioning tools?
In case of tankers, the speed of cargo pumps is reduced while stripping, why?
The process of depositing chromium on to steel surfaces by diffusion coating is known as:
F.O. transfer pump was working efficiently, but it stopped taking suction suddenly. There is a sounding of 6.0 m in the F.O. deep tank. The suction pressure gauge was renewed recently and is showing a positive pressure when pump is running, but Pump is not transferring any F.O. What is the most probable cause?
The purpose of an evaporator in the domestic refrigeration system is to
Which of the following types of damages are metal seatings of a valve subject to? Choose the correct alternative.
In a Parallel-Gate type valve the sealing between the valve and the disc is provided by:
You have seen and operated several valves onboard ships. All the butterfly valve operation handles are operated by a locking arrangement because:
When centrifugal pump is used to pump a liquid of higher specific gravity the pump Power will
The process of depositing zinc on steel surfaces by diffusion coating is known as
Which of the following is a true statement? (Choose more than one option if true)
A thin layer of electrolyte trapped in a small pits on a metal surface, and remaining stagnant over a period of time, may cause
The attached vacuum pump of a ballast pump operates on the principle of a:
The crank web deflection readings of a diesel engine would be erroneous in which of the following conditions?
Your ship has an OWS and reciprocating bilge pump of capacity 2.0 m3 /hr. It takes about 12 hours to pump out the complete bilge tank through OWS. The ship is going to dry-dock and Chief Engineer is recommending company to install a centrifugal pump of 10 m3 capacity which will take the same space and can pump out the bilge tank only in 2.5 hrs. The company should:
Which of the following types of boiler burners have maximum turn down ratio? (Y-jet, 20:1)
Which of the following option gives you the correct sequence of the metals in decreasing order of preferential corrosion when all of them are bonded and immersed in an electrolyte?
In a positive displacement reciprocating pump, the use of the accumulator is to?
You have started pumping out a Fore peak tank. The ballast pump is running showing a low discharge pressure but a positive suction pressure, Chief Engineer asks you to throttle the discharge valve to increase the back pressure on the pump. Why do you require to do the same?
Aluminum being lower than zinc in galvanic series provides lesser protection to steel compared to the zinc coating. Which one of the following is a true statement?
Which of the following is NOT a true statement?
By which of the following is the attached vacuum pump of a ballast pump is driven?
Which of the group of method are used for priming of centrifugal pumps onboard ships?
Which of the following instruments measures propeller drop?
Pump Start but Motor gets overloaded or Trip on overload
You have overhauled a centrifugal pump and while assembling forgot to install the o-ring between the sleeve (provided in way of gland packing) and the shaft. What impact does this have?
You must have used reinforced rubber joints. The reinforcement is normally provided using non-asbestos fibres. The reinforcement is provided because
A ball valve was found leaking in service. Upon inspection it was found that the PTFE seat had worn out and was renewed. The valve stopped leaking in closed condition. How do think a ball valve provides perfect sealing?
You are pumping out sludge to a shore facility using your sludge pump. You find that the discharge rate of pump is very slow and suction filter is getting clogged frequently. What is the best alternative to counteract the problem?
It has been reported that Engine room bilge pump was unable to take suction from Fwd. (P) bilge well while it taking suction efficiently from Fwd.(S) & aft bilge wells. What could be the most probable cause?
A drain cooler is provided with S.W. cooling. What is the best way to increase the temperature of condensate draining to the hotwell?
When A/E stand by FO heater in use M/E is running the heater fuel inlet v/v open slowly
Corrosion protection of steel surfaces by zinc coating can be carried out only at temperatures below 65 Deg. C. For higher temperatures:
After cleaning the sea chest filter you have placed the filter in the body and tightened the cover. Which one of the following is the best alternative?
Bronze is an alloy typically consisting of:
Which of the following is an important requirement for proper functioning of sacrificial anode system:-
In which of the following types of refractory failure, softening of the refractory bricks takes place due to presence of sodium/vanadium in fuel?
Most steam traps respond well to cleaning. But when a thermodynamic trap fails to operate after cleaning, the next course of action should be
Impingement corrosion is a
Motor stator winding badly contaminated by dirt, oil and grease should be cleaned by:
Which of the following valves cannot prevent backflow of liquid in a pipeline?
Which of the following is NOT a correct point for sampling of system lube oil for on board or shore analysis?
Which of the following statements is False about cleanliness of electric motors?
High tensile steels are:
Normally so called ‘single screw pumps’ are used as sludge pumps in engine room. What is the correct technical name of these pumps?
A refrigerant compressor will run continuously when there is
Which one of the following is a type of corrosion
Which of the following can lead to premature failure of roller bearings?
Which of the following can be done to reduce the cold corrosion of Main Engine cylinder liners using high sulphur fuel oil:-