Turbocharger most preferred
Correct method of greasing a centrifugal pump bearing is:
The difference between the discharges of a centrifugal pump n reciprocating pump the discharge of centrifugal pump is ----------while that if reciprocating is ---------
Which type of valve is not rotating type....
Refer cooling tubes act as self-cooling & expansion by
It is given that engine room bilge pump has suction manifold on which 3 valves are located. One valve for the 3 engine room bilge wells suction, another one for Bilge tank suction and the third one is for sea water suction. It is found that the Bilge pump is unable to take suction from any of the bilge wells, but is able to take suction efficiently from Bilge tank. What is the most probable cause?
As the amount of moisture in the air increases, the difference between the dry bulb and wet bulb temperatures will……
Which of the following used in boiler treatment is an oxygen scavenging
Pump Start but Motor get overloaded or Trip on overload.
In which of the following types of refractory failure, softening of the refractory bricks takes place due to presence of sodium/vanadium in fuel?
MECHANICAL SEALS ARE NOT USED IN
Rudder is locked at an angle & can be moved by manual change-
Why should combustion blowers left running for while after firing a boiler?
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?
If dew point increases what happens to wet bulb temp and dry bulb temp?
Dezincification of brass can be prevented by introduction of additives like
Purifier is not rotating with desired rpm, reason?
A ball valve is found leaking in service and needs to be overhauled. What type of repairs can be carried out?
Function of a de-superheater is to.
Which of the following valve is liable to open or close under pressure of fluid, if not locked in position?
The dew point is reached when the wet bulb temperature is
The water from discharge side of the centrifugal pump is supplied as sealing water to the stuffing box for the pump shaft at:
Pump driven clutch type attached vacuum pumps are commonly used for priming ballast pumps and emergency fire pumps. What is the factor which clutches the vacuum pump clutch to the pump clutch during start of the pump?
When securing a centrifugal distillate pump, which of the listed steps should be carried out FIRST?
Increasing the rotational speed of a cargo pump the pump flow rate will:
Salinity of distilled water produced depends upon _
centrifugal pump will typically give you a low flow rate at a lower pressure, where a piston pump will give you more pressure and higher flow rate. Is the statement correct?
The main disadvantages of a reciprocating pump over a Gear pump is that:
Chromium is a nobler metal when compared to that of steel. In some marine applications Chromium is electroplated to the steel surfaces. Why?
What type of tubes used in Air comp cooler?
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 function of an accumulator on the discharge side of a reciprocating bilge pump is to:
Which of the following would be the correct way(s) of using a torque wrench?
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?
Which of the following valves cannot prevent backflow of liquid in a pipeline?
The gland packing of centrifugal pump should have
Emergency steering testing
After your overhaul a centrifugal pump is not rotating what may be the possible cause:
Centrifugal pumps cannot handle air and require priming. But you are aware that centrifugal which on the same principal can handle air very well. Which two properties of air are responsible because of which the centrifugal pumps cannot handle air:-
Pump driven clutch type attached vacuum pumps are commonly used for priming ballast pumps and emergency fire pump. What is the factor which de-clutches the vacuum pump from the pump clutch?
The most important control measure to prevent boiler tube failure is:
Change in volume in closed cooling system is achieved by
Principle of fire fighting onboard is
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?
U R responsible for daily transfers of engine room bilges. U follow the sequences aft –fwd (P)-fwd(s) bilge well n u have never experienced a problem but 5/E started the transfer n first transferred forward (s) bilge well n without any problem n u join him later u find that bilge pump is not taking suction fr f(p) n aft bilge well n then u have checked everything is normal. What is the cause?
Which of the following is a correct point for sampling of system lube oil for on board or shore analysis?
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?
Copper tubing is used in refrigerant system because