CDC 3E151 HVAC/R JOURNEYMAN VOLUME 3
|ACTUAL QUESTIONS AND VERIFIED
ANSWERS|BRAND NEW 2026-2027
UPDATE|GRADED A+
Question 1
(401) What relationship between magnetic field and conductors is required to generate
voltage mechanically?
CORRECT ANSWER
Relative motion between the two
Question 2
(401) Nickel and chromium alloys are used in heater elements because they
CORRECT ANSWER
make it possible to operate the elements at high temperatures without melting
Question 3
(401) What effect does the length of a wire have on the amount of pressure needed to
force the electrons to the load device?
CORRECT ANSWER
More pressure will be needed
Question 4
(401) Resistance should not be considered a bad thing because
1
,CORRECT ANSWER
even conductors offer resistance to flow
Question 5
(401) All forms of opposition to current flow are measured in
CORRECT ANSWER
ohms
Question 6
(401) How is direct current produced?
CORRECT ANSWER
By a battery or a thermocouple
Question 7
(401) The sine wave gets its name because the alternator output voltage at any one point
on the wave is the product of the sine of the
CORRECT ANSWER
rotor angle and the peak voltage
Question 8
(401) What can you do to greatly increase the inductance of a coil?
CORRECT ANSWER
Add a core of magnetic material
2
, Question 9
(401) Current lags the voltage in a purely inductive circuit because of the
CORRECT ANSWER
opposition by inductive reactance
Question 10
(402) When working with electrical equipment, how should you treat all electrical circuits
as
CORRECT ANSWER
live
Question 11
(402) How can you prevent anyone from accidentally closing the breaker to a circuit that is
under repair?
CORRECT ANSWER
Lock the breaker in the OFF position and tag it to indicate that the system is being repaired
Question 12
(403) If using an aluminum-clad wire in place of a copper wire, how many sizes larger must
the wire be to carry the same current safely?
CORRECT ANSWER
One
3
|ACTUAL QUESTIONS AND VERIFIED
ANSWERS|BRAND NEW 2026-2027
UPDATE|GRADED A+
Question 1
(401) What relationship between magnetic field and conductors is required to generate
voltage mechanically?
CORRECT ANSWER
Relative motion between the two
Question 2
(401) Nickel and chromium alloys are used in heater elements because they
CORRECT ANSWER
make it possible to operate the elements at high temperatures without melting
Question 3
(401) What effect does the length of a wire have on the amount of pressure needed to
force the electrons to the load device?
CORRECT ANSWER
More pressure will be needed
Question 4
(401) Resistance should not be considered a bad thing because
1
,CORRECT ANSWER
even conductors offer resistance to flow
Question 5
(401) All forms of opposition to current flow are measured in
CORRECT ANSWER
ohms
Question 6
(401) How is direct current produced?
CORRECT ANSWER
By a battery or a thermocouple
Question 7
(401) The sine wave gets its name because the alternator output voltage at any one point
on the wave is the product of the sine of the
CORRECT ANSWER
rotor angle and the peak voltage
Question 8
(401) What can you do to greatly increase the inductance of a coil?
CORRECT ANSWER
Add a core of magnetic material
2
, Question 9
(401) Current lags the voltage in a purely inductive circuit because of the
CORRECT ANSWER
opposition by inductive reactance
Question 10
(402) When working with electrical equipment, how should you treat all electrical circuits
as
CORRECT ANSWER
live
Question 11
(402) How can you prevent anyone from accidentally closing the breaker to a circuit that is
under repair?
CORRECT ANSWER
Lock the breaker in the OFF position and tag it to indicate that the system is being repaired
Question 12
(403) If using an aluminum-clad wire in place of a copper wire, how many sizes larger must
the wire be to carry the same current safely?
CORRECT ANSWER
One
3
