4-11.
The temperature at the bulb of the
temperature regulator drops below the set
temperature and the valve position
indicator shows COOLER CLOSED. Which of
the following remedial measures should
you take?
1.
Secure the packing gland nut wrench
tight
2.
Grind the valve seats until a perfect
seal is achieved
3.
Insert the bulb into the ship's
piping in the horizontal position
with the arrow on the indicator disk
point downward
4.
Insert the bulb into the ship's
piping in the vertical position with
the nut at the top of the unit
4-12.
Why should a liquid filled bulb of a
temperature regulator be installed
either in the vertical position with the
nut up or in the horizontal position with
the arrow up?
1.
To allow the liquid level to be above
the end of the internal capillary
tube
2.
To allow the liquid level to be below
the capillary tube
3.
To prevent liquid from effecting the
bellows
4.
To ensure that the arrow on the
indicator disk is always pointing
upward
When answering questions 4-13 through
4-15, assume you are in the process of
adjusting
a temperature regulator to the diesel
engine freshwater cooling system.
4-13.
The manual crankpin should be rotated
until the pointer is aligned with which
of the following marked positions on the
indicator plate?
1.
Cooler closed
2.
Cooler bypass
3.
Thermostatic
4.
Each of the above
4-14.
When is the indicator slid up or down for
adjustment to the proper position?
1.
After the lower end of the seating
sleeve comes in contact with the
lower end of the thermostatic stem
2.
Before the lower end of the seating
sleeve comes in contact with the
lower end of the thermostatic stem
3.
After the lower end of the seating
sleeve comes in contact with the
upper end of the thermostatic stem
4.
Before the upper end of the seating
sleeve comes in contact with the
lower end of the valve stem
4-15.
The indicator plate is secured and the
pointer and thermostatic center marks are
aligned.
What is the final valve stem
adjustment you should make prior to
tightening the locknut?
1.
Two complete turns into the
thermostatic stem past the seating
sleeve contact
2.
One complete turn into the
thermostatic stem past the seating
sleeve contact
3.
Two complete turns into the
thermostatic stem past the poppet
valve seating position
4.
One complete turn into the
thermostatic stem past the poppet
valve seating position
4-16.
If the desired temperature of the water
in a diesel engine cooling system is
160°F, a properly adjusted temperature
regulator will maintain the water at a
temperature between
1.
150° and 160°F
2.
150° and 170°F
3.
160° and 170°F
4.
160° and 18O°F
Learning Objective: Recognize the
purpose and types of heat exchangers;
indicate what factors affect their
operation; and point out the methods of
maintenance and repair.
4-17.
In a marine cooling system installation,
which of the following engine coolants
may be circulated through a heat
exchanger?
1.
Oil
2.
Freshwater
3.
Saltwater
4.
Both 2 and 3 above
23
