Page 33 - Apprentice Manual_Neat

67. Rotating diodes are best tested with which of the following tools?

a. Mega-Ohmmeter
b. Rotating diode tester specified by the generator manufacturer
c. DVOM
d. Oscilloscope

68. Airflow through a generator should never come from:

a. The rear to the flywheel housing
b. The flywheel housing to the rear
c. A remote source
d. Generators are typically explosion proof and require no airflow

69. A restive load bank connected to a generator would best be used for which of the following
purposes?

a. Test engine cooling
b. Test engine performance
c. Clean a diesel engine from “wet-stacking”
d. All of the above

70. What is the maximum desired current @ 80% load for a 15KW single phase 120/240 volt generator?

a. 50 amps
b. 110 amps
c. 80 amps
d. 25 amps

71. What is the desired maximum current @ 100% load for the following three phase generator?
PF=0.85, KW=350, V=480.

a. 857 amps
b. 300 amps
c, 495 amps
d. 1143 amps
.
72. A delta generator that has been wired in “zig-zag” produces what level of voltage?

a. 4160/2400 single phase
b. 208/120 three phase
c. 480/277 three phase
d. 240/120 single phase

73. A twelve-lead generator may be rewired to all of the following configurations EXCEPT:

a. High WYE
b. Low WYE
c. Zigzag
d. WYE Delta

Page 25 - EGSA Apprentice Certification Program Study Guide