CDC 3E151 - HVAC/R JOURNEYMAN VOLUME 3 EXAM QUESTIONS AND VERIFIED ANSWERS LATEST UPDATE
(401) What relationship between magnetic field and conductors is required to generate voltage mechanically?
Relative motion between the two
(401) Nickel and chromium alloys are used in heater elements beca...
(401) What relationship between magnetic field and conductors is required to
generate voltage mechanically?
Relative motion between the two
(401) Nickel and chromium alloys are used in heater elements because they
make it possible to operate the elements at high temperatures without melting
(401) What effect does the length of a wire have on the amount of pressure
needed to force the electrons to the load device?
More pressure will be needed
(401) Resistance should not be considered a bad thing because
even conductors offer resistance to flow
(401) All forms of opposition to current flow are measured in
ohms
(401) How is direct current produced?
By a battery or a thermocouple
(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
rotor angle and the peak voltage
(401) What can you do to greatly increase the inductance of a coil?
Add a core of magnetic material
(401) Current lags the voltage in a purely inductive circuit because of the
, opposition by inductive reactance
(402) When working with electrical equipment, how should you treat all electrical
circuits as
live
(402) How can you prevent anyone from accidentally closing the breaker to a
circuit that is under repair?
Lock the breaker in the OFF position and tag it to indicate that the system is being
repaired
(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?
One
(403) The type of insulation for a conductor is primarily based on
where it is going to be used
(403) What, if anything, does the location of a conductor affect?
Its current-carrying capacity
(404) How is a solderless pigtail splice finished?
With a wire nut
(404) When making a terminal loop, what will happen if the loop is not placed in a
clockwise direction?
The screw tends to spread the loop as you tighten it
(404) How is a stranded wire pushed into a push in connection?
Insert a small screwdriver into the slot
(404) How do you ensure the wire is placed tightly into a push-in connection?
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