4TH CLASS POWER ENGINEERING
EXAM | GUARANTEED PASS
As back EMF decreases the net armature EMF:
Select one:
a. remains constant
b. decreases
c. increases
d. decreases amount of armature current - Accurate Answers✔✔✔ c
The magnetic field in a DC machine may be supplied by permanent
magnets in small units. Large DC machines use field poles that are
essentially:
Select one:
a. insulators
b. resistors
c. non-magnetic
d. electromagnets - Accurate Answers✔✔✔ d
The strength of the magnetic field produced in a shunt wound generator:
Select one:
a. is weak
b. is fairly constant
c. fluctuates
, d. is regulated by an external AC supply - Accurate Answers✔✔✔ b
How many slip rings are required for a three phase stationary field
alternator:
Select one:
a. 1
b. 2
c. 3
d. none - Accurate Answers✔✔✔ c
Apparent power is the power:
Select one:
a. used for the actual work
b. generated by rotating equipment
c. supplied by the utility
d. caused by system capacitance - Accurate Answers✔✔✔ c
A shunt type DC generator has __________ output voltage:
Select one:
a. very high
b. nearly constant
c. very low
d. erratic - Accurate Answers✔✔✔ b
EXAM | GUARANTEED PASS
As back EMF decreases the net armature EMF:
Select one:
a. remains constant
b. decreases
c. increases
d. decreases amount of armature current - Accurate Answers✔✔✔ c
The magnetic field in a DC machine may be supplied by permanent
magnets in small units. Large DC machines use field poles that are
essentially:
Select one:
a. insulators
b. resistors
c. non-magnetic
d. electromagnets - Accurate Answers✔✔✔ d
The strength of the magnetic field produced in a shunt wound generator:
Select one:
a. is weak
b. is fairly constant
c. fluctuates
, d. is regulated by an external AC supply - Accurate Answers✔✔✔ b
How many slip rings are required for a three phase stationary field
alternator:
Select one:
a. 1
b. 2
c. 3
d. none - Accurate Answers✔✔✔ c
Apparent power is the power:
Select one:
a. used for the actual work
b. generated by rotating equipment
c. supplied by the utility
d. caused by system capacitance - Accurate Answers✔✔✔ c
A shunt type DC generator has __________ output voltage:
Select one:
a. very high
b. nearly constant
c. very low
d. erratic - Accurate Answers✔✔✔ b
