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Steam SIm test 5
California Maritime Academy, Steam SIm test 5, Coast Guard questions
Terms in this set (30)
When condenser tube ends are rolled into both tube sheets the effects due to differential expansion are minimized by the use of ____.
Shell expansion joints
Steam condensed in the air ejector intercondenser, drains to the ____.
Main condenser through the loop seal
Which statement is true concerning two-stage air ejector assemblies?
The steam/air mixtures from the main condenser is discharged by the first stage jet pump to the intercondenser
In a closed feed and condensate system, the drain from the second stage air ejector returns directly to the ____.
Atmospheric drain tank
If the condensate in the loop seal of the intercondenser is lost, ____.
Some air will be drawn into the main condenser
A main condenser utilizing a scoop for the circulation of seawater must be constructed as a _____.
Single-pass heat exchanger
Air removed from the main condenser is vented to the atmosphere through the _____.
The vent line from the main condenser waterboxes was not opened when the waterside was recharged. This would _____. I. lead to a build up of pressure on the tube sheet greater than 40 psig II. prevent the design vacuum from being attained under normal operating conditions at sea
By which of the following methods listed is the recirculating valve in the main condenser recirculating line designed to be controlled?
Electrolytic corrosion in the condenser circulating water system can be reduced by _____.
Using zinc plates in the waterboxes
In a marine condenser designed with a reheating hotwell, the hotwell is reheated by _____.
Steam lanes in the condenser
The differential temperature of the main condenser circulating water will be affected by _____. I. decrease in circulating pump pressure II. degree or amount of scaling or fouling
Either I or II
Vapor blowing from the air ejector condenser vent may be caused by _____.
Insufficient condensate flow
A condensate recirculating line is provided to the main condenser in a closed feedwater system to _____.
Provide adequate cooling water to the air ejector inter and after condensers
A steam supplied heat exchanger will fail to maintain the designed quality of heated liquid output if the _____. I. steam supply absolute pressure is increased II. tubes are leaking
A steam supplied heat exchanger will fail to maintain the designed quality of heated liquid output if the _____. I. steam side shell absolute pressure is decreased II. heat exchanger drain is leaking
Erosive tube failure in a heat exchanger can result from _____.
Excessive cooling water velocity
Excessive water flow beyond the design limits of a feedwater heater will be indicated by a/an_____.
Increase in the pressure drop between the water inlet and outlet
In a shell-and-tube type heat exchanger, the most common cause of decreased performance is _____.
Fouling on the seawater side
In a shell-and-tube type hydraulic fluid cooler, the amount of heat transferred from the hydraulic fluid to the cooling water depends upon _____.
All of the above —
the temp of the hydraulic fluid;
The flow rate of both the cooling water and the hydraulic fluid;
The temp of the cooling water
The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube type heat exchanger is greatest in which of the flow designs listed?
Which of the following statements is true concerning lube oil coolers?
The pressure of the oil is greater than that of the cooling water
Which of the following statements is true concerning a radiator type heat exchanger?
Air flow provided by a fan is used as the cooling medium
Which of the copper alloys listed is commonly used in heat exchangers and possesses a high resistance to corrosion?
If the drain regulator used in the operation of the combined L.P. feedwater heater, shown in the illustration, is incorrectly set to maintain too high of a level (condensate level covers approximately the lower half of tubes in the in the first stage heater) the resulting operation will _____. (SG-0025)
Cause the feed water temperature to drop below the designed operating temperature
The feedwater heater shown in the illustration was designed to maintain the required feedwater outlet temperature with an approximate 10" (25.4 cm) Hg shell vacuum. If the shell vacuum is increased to approximately 16" (40,64 cm) Hg vacuum, the _____. (SG-0025)
Feedwater outlet temperature will decrease
During normal operation the steam flow from the auxiliary exhaust line to the DC heater is a function of _____.
Rate of condensation in the DC heater
The DC heater functions to _____.
Store, heat, and deaerate feedwater
Vent condensers are usually an integral part of deaerating feed heaters and serve to condense _____.
The vapor entrained with the noncondensable gases
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will _____.
Vary from section to section throughout the heat exchanger
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