EGSA Set 10 - Troubleshoot
System Problems Exam Study
Guide
When troubleshooting a running system with rotating diodes, a low voltage is detected.
What is likely the cause?
A - An open diode.
B - Shorted diode.
C- Reverse biased diode.
D- There is no problem. Rotating diode systems are only low voltage systems. - Answer
B - Shorted diode. A shorted diode will cause one half of the rectifier to draw full current
at no volts.
In a DC starting system, which of the following would cause the solenoid to chatter and
the system not to start?
A - E-stop depressed
B - High temperature warning
C- Faulty solenoid
D- Weak batteries - Answer D - Weak batteries.
Troubleshooting should never be:
A - Done methodically section by section.
B - Documented to prevent steps already performed.
C - Used as a means to find the root cause of the problem.
D - Done as quickly as possible to get the system back on line. - Answer D - Done as
quickly as possible. Produces sloppy work.
An ANSI device 50 detects:
A - Under voltage
B - Under frequency
, C - Over current
D - Under current - Answer C - Overcurrent. An ANSI device 50 is an instantaneous
over-current relay.
During a load test the frequency keeps dropping as more load is added. The governor is
checked and the actuator is NOT at the full ON position. What is most likely the
problem?
A - No problem, frequency normally drops during periods of heavy loads.
B - The governor has droop adjusted in to it.
C - Fuel level is low and the governor is conserving.
D - Fuel pressure is low and the governor is trying to compensate. - Answer B - The
governor has droop adjusted in to it. Because the actuator is not in full position
indicates it has more power to output. More power would keep the generator from
slowing which lowers frequency.
What would cause the top tube from the thermostat housing to the radiator top tank to
be cold during a normal load test?
A - Too much oil pressure.
B - Stuck open thermostat.
C - Stuck closed thermostat.
D - Low coolant level. - Answer B - Stuck open thermostat. Coolant flowing through
radiator remains below operating temperature.
During troubleshooting a bad part is discovered and replaced. Upon start up, the part
fails again in exactly the same way. What is likely the problem?
A - The replaced part was defective.
B - Multiple problems existed where one symptom masked a deeper problem which is
taking out the replaced part.
C - The part failed for another unrelated reason.
D - Gremlins. - Answer B - There can be several problems, and the root cause is behind
the failures.
A generator with electronic governor will start, but will not go to rated speed. What is
NOT a possible problem?
A - Defective governor.
B - Fuel Pressure too low.
System Problems Exam Study
Guide
When troubleshooting a running system with rotating diodes, a low voltage is detected.
What is likely the cause?
A - An open diode.
B - Shorted diode.
C- Reverse biased diode.
D- There is no problem. Rotating diode systems are only low voltage systems. - Answer
B - Shorted diode. A shorted diode will cause one half of the rectifier to draw full current
at no volts.
In a DC starting system, which of the following would cause the solenoid to chatter and
the system not to start?
A - E-stop depressed
B - High temperature warning
C- Faulty solenoid
D- Weak batteries - Answer D - Weak batteries.
Troubleshooting should never be:
A - Done methodically section by section.
B - Documented to prevent steps already performed.
C - Used as a means to find the root cause of the problem.
D - Done as quickly as possible to get the system back on line. - Answer D - Done as
quickly as possible. Produces sloppy work.
An ANSI device 50 detects:
A - Under voltage
B - Under frequency
, C - Over current
D - Under current - Answer C - Overcurrent. An ANSI device 50 is an instantaneous
over-current relay.
During a load test the frequency keeps dropping as more load is added. The governor is
checked and the actuator is NOT at the full ON position. What is most likely the
problem?
A - No problem, frequency normally drops during periods of heavy loads.
B - The governor has droop adjusted in to it.
C - Fuel level is low and the governor is conserving.
D - Fuel pressure is low and the governor is trying to compensate. - Answer B - The
governor has droop adjusted in to it. Because the actuator is not in full position
indicates it has more power to output. More power would keep the generator from
slowing which lowers frequency.
What would cause the top tube from the thermostat housing to the radiator top tank to
be cold during a normal load test?
A - Too much oil pressure.
B - Stuck open thermostat.
C - Stuck closed thermostat.
D - Low coolant level. - Answer B - Stuck open thermostat. Coolant flowing through
radiator remains below operating temperature.
During troubleshooting a bad part is discovered and replaced. Upon start up, the part
fails again in exactly the same way. What is likely the problem?
A - The replaced part was defective.
B - Multiple problems existed where one symptom masked a deeper problem which is
taking out the replaced part.
C - The part failed for another unrelated reason.
D - Gremlins. - Answer B - There can be several problems, and the root cause is behind
the failures.
A generator with electronic governor will start, but will not go to rated speed. What is
NOT a possible problem?
A - Defective governor.
B - Fuel Pressure too low.
