COMPETENCE 1

50問 • 2年前

Peter j Zuniega

通報

問題一覧

1. Which steam plant watch operating condition will require priority attention over the other conditions listed?

Low water level main boiler

The watch engineer finds the refrigeration compressor has blown the shaft seal. In this situation, he should _

secure the compressor at once and close the suction and discharge valves

What is the proper way of storing an oxygen and acetylene cylinders?

Horizontal with the cylinder caps screw on

What is the main reason that auxiliary steam is normally attemporated before entering the feed heater of a flash evaporator?

To reduce the rate of scale formation on heating surfaces

If the temperature is a hot air manifold were found to be 122⁰F, what will be the equivalent reading on the centigrade scale?

50⁰C

Which of the listed fuel oil ignition methods are commonly found on automatically fired auxiliary boilers aboard merchant vessels?

A high energy electric spark

What maybe the cause of injection lag in a diesel engine?

The diesel fuel used having a high viscosity

A lube oil filter can be used to remove most contaminants from lube oil. What contaminant will remain in the lube oil after filtering?

Fuel/Diesel oil

Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes. What is the governor characteristic used to accomplish this?

compensation

What might be the cause of excessive vibration of an automatically fired auxiliary boiler?

combustion pulses

A pneumercator is an instrument used to indicate _____.

Tank fluid level

What reading will be obtained if we use a dry uncoated sounding rod or tape to measure the depth of water in a reserve feed water tank?

Very inaccurate

If the temperature in a hot air manifold were found to be 122oF, what will be the equivalent reading on the centigrade scale?

50⁰C

Which of the listed fuel oil ignition methods are commonly found on automatically fired auxiliary boilers aboard merchant vessels?

A high energy electric spark

What maybe the cause of injection lag in a diesel engine?

The diesel fuel used having a high viscosity.

A lube oil filter can be used to remove most contaminants from lube oil. What contaminant will remain in the lube oil after filtering?

Fuel/Diesel oil

Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes. What is the governor characteristic used to accomplish this?

Compensation

What might be the cause of excessive vibration of an automatically fired auxiliary boiler?

Combustion pulses

A pneumercator is an instrument used to indicate _____.

tank fluid level

What reading will be obtained if we use a dry uncoated sounding rod or tape to measure the depth of water in a reserve feed water tank?

Very inaccurate

Where is the contaminated oil enters the centrifuge in a disk type centrifugal purifier?

At the top through the regulating tube

Why is condensate being pumped from the condenser to the DC heater instead of directly to the boiler?

Condensate should be deaerated before entering the boiler

The device most commonly used to measure the exhaust gas temperature of a diesel engine cylinder is called a _______.

pyrometer

Exhaust valve grooving and corrosion is caused by certain components of residual fuel oil. These components are sodium, sulfur, and ___________.

Vanadium

A dirty atomizer sprayer plate in the burner of an auxiliary boiler, would be indicated by ________.

an unevenly shaped burner flame

Why do most temperature control valves in diesel engine closed freshwater cooling systems bypass the flow of jacket water around the cooler instead of around the engine?

excessive cooling would take place in the heat exchangers at high loads

A pyrometer is capable of producing a voltage by _____.

heating a junction of two dissimilar metals

The DC heater functions to _____.

Store, heat, and deaeratefeedwater

Excessive lubricating oil consumption in a running diesel engine can be caused by _________.

excessive valve‐guide clearance

Increasing the valve clearance between a valve stem and rocker arm, will in the valve ________

staying open for a shorter period of time

Oil accumulating in the exhaust piping or manifold of a diesel engine can be caused by ______.

worn valve guides

Valve lash, or clearance refers to the _________.

clearance between the top of the valve stem and the rocker arm

Crank web deflection readings will give a positive indication of ___________.

worn main bearing journals

Cooling water pumps driven by direct‐reversing diesel engines are usually ______.

straight impeller vane with concentric housing

Rapidly discharging condensate into the DC heater during normal steaming conditions could cause _____.

Decrease in auxiliary exhaust pressure

Most large main propulsion diesel engines use a duplex lube oil strainer to _______.

ensure a positive flow of oil at all times

Throttling a burner air register on an auxiliary boiler could result in ________.

smoky boiler operation

Which of the following problems can cause fluctuating pressure in the closed cooling system of a main propulsion diesel engine?

cavitation in the cooling water pump

The effective stroke of a constant‐stroke, individual, fuel injection pump is varied by the __________.

control rack

The minimum design height of the DC heater is determined by the _____.

Minimum net positive suction head required by the main feedpump

You are operating a main propulsion diesel engine at a constant load when the jacket temperature begins to rise. This could be caused by _________

a piston about to seize

The bulk of the solid material entering a centrifugal purifier with lube oil is ________.

trapped in the bowl

The DC heater automatic level dump valve is used to _____.

Drain excess feedwater to the distilled water tank

While at sea, the flash type evaporator is discharging the output to the distill tanks. If it becomes necessary to reduce the feed water temperature below 165oF, you should _____.

Continue the current evaporator operation

Exhaust pyrometer readings provide an indication of the _______.

distribution of the load between engine cylinders

Fuel combustion in a diesel engine cylinder should begin just before the piston reaches top dead center and should ___________.

continue through the after‐burning period

Which of the filters listed will deplete the additives in lubricating oil?

Adsorbent filter

A change in engine speed is required before a governor is able to make a corrective movement of fuel rack. This aspect of governing is commonly expressed as a percent and is known as ___________.

governor sensitivity

Reducing the clearance between a valve stem and rocker arm will result in the valve __________.

having a longer duration of opening

Diesel engine injection lag is caused by ____________.

compressibility of the fuel

COMPETENCE 2