Page 92 - Apprentice Manual_Neat

S4-Q100.) Air dampers may be operated by which of the following systems?

a.) Electrical
Yes.
b.) Pneumatic
Yes.
c.) Gravity
Yes.
d.) *All of the above
Correct. Because all of the above are types of actuators, this is the best answer
Examples of incorrect answers would be: Hydraulic, water, solar.

S4-Q101.) What is the function of a jacket water heater thermostat?

a.) To regulate the maximum coolant temperature
This is the function of the engine thermostat.
b.) To vary the current, proportionally, to the heating element
Thermostats are usually on/off devices and do not have this capability.
c.) To turn on whenever the engine temperature exceeds 100oC (boiling point)
With the aid of coolant, some systems are designed to operate above this temperature. This is an
arbitrary number and not every system will operate at that point. Further, this device is used to
maintain minimum temperature.
d.) *To maintain the minimum temperature of the coolant
Correct. This device will turn on the jacket water heater to prevent the coolant from going
below a desired temperature.

S4-Q102.) Remote annunciator panels indicate the status of the engine. What color would be used to
indicate a system shutdown?

a.) Green
Green is operational, normal.
b.) Amber
Amber is cautionary.
c.) *Red
Correct. Red is an alarm state.
d.) White
White is not used for status.

S4-Q103.) Louvers serve what purpose?

a.) *Seal a room when the engine is inactive
Correct. They seal out unwanted contamination, weather, etc. when the system is not in use.
b.) Provide ventilation for maintenance crews
While they may be used for this purpose, it is not their intended use.
c.) Allow exhaust gasses to be purged from the room
There should not be exhaust gas in the engine room. A serious problem has occurred if this is the
case.
d.) Reduce the engine noise decibel level
The louvers should be open during operation, thus they would have no impact on sound levels.

EGSA Apprentice Certification Program Study Guide - Page 84