ELE 146 EXAM LATEST
A form letter is used to simplify relay contacts. What form letter would
identify a relay with a SPST-NC contact type? - ANSWERS-B
Which relay type comes with convertible contacts that can be placed in
either an NO or NC operating position? - ANSWERS-Industrial or
Heavy Duty relays
Are reed relays usually used to switch loads in the 0.1 A to 10 A range?
- ANSWERS-Yes
Why are gold-flashed silver contacts used in automobile air bag
activation control systems? - ANSWERS-Reduce chances of sulfidation
& have a good electrical connection
Should relay contacts be filed when showing signs of wear? -
ANSWERS-No, always replaced
In a 120 V circuit, is it acceptable when 2 V are measured across a
closed contact operating a load? - ANSWERS-No, <1V
END OF
PAGE
1
, ELE 146 EXAM LATEST
In a 120 V circuit, is it acceptable when the full 120 V are measured
across an open relay contact? - ANSWERS-No, relay will be defective
and contacts will not close at maximum voltage
Can reed relays be manually operated? - ANSWERS-No
What are the two windings of a transformer called? - ANSWERS-The
two winding of a transformer are called Primary, and secondary
winding.
If a transformer has a turns ratio of 1:4, what is the transformer's voltage
ratio? - ANSWERS-the transformers voltage ratio would be the same as
the turn ratio for this one. 1:4
If a transformer has a turns ratio of 1:4, what is the transformer's current
ratio? - ANSWERS-The transformers current ratio would be the
reciprocal of turn ratio. 4:1
. If a transformer has a turns ratio of 1:4, what is the transformer's power
ratio? - ANSWERS-the power ratio of the transformer would be 1:1
END OF
PAGE
2
, ELE 146 EXAM LATEST
If a transformer has a turns ratio of 1:4 and 115 V is applied to the
primary, how many volts are on the secondary? - ANSWERS-460 V.
Why are transformer iron cores laminated? - ANSWERS-To minimize
current loss.
What type of electrical service is the most common for residential
dwellings? - ANSWERS-120/240.
Why do control transformers usually have two primary coils? -
ANSWERS-To allow both primary coils to be connected to the
transformer.
What do "X" markings on a transformer represent? - ANSWERS-Low
voltage.
What do "H" markings on a transformer represent? - ANSWERS-High
voltage.
When connecting the primary of a control transformer to high voltage,
are the coils connected in series or parallel? - ANSWERS-Series.
END OF
PAGE
3
A form letter is used to simplify relay contacts. What form letter would
identify a relay with a SPST-NC contact type? - ANSWERS-B
Which relay type comes with convertible contacts that can be placed in
either an NO or NC operating position? - ANSWERS-Industrial or
Heavy Duty relays
Are reed relays usually used to switch loads in the 0.1 A to 10 A range?
- ANSWERS-Yes
Why are gold-flashed silver contacts used in automobile air bag
activation control systems? - ANSWERS-Reduce chances of sulfidation
& have a good electrical connection
Should relay contacts be filed when showing signs of wear? -
ANSWERS-No, always replaced
In a 120 V circuit, is it acceptable when 2 V are measured across a
closed contact operating a load? - ANSWERS-No, <1V
END OF
PAGE
1
, ELE 146 EXAM LATEST
In a 120 V circuit, is it acceptable when the full 120 V are measured
across an open relay contact? - ANSWERS-No, relay will be defective
and contacts will not close at maximum voltage
Can reed relays be manually operated? - ANSWERS-No
What are the two windings of a transformer called? - ANSWERS-The
two winding of a transformer are called Primary, and secondary
winding.
If a transformer has a turns ratio of 1:4, what is the transformer's voltage
ratio? - ANSWERS-the transformers voltage ratio would be the same as
the turn ratio for this one. 1:4
If a transformer has a turns ratio of 1:4, what is the transformer's current
ratio? - ANSWERS-The transformers current ratio would be the
reciprocal of turn ratio. 4:1
. If a transformer has a turns ratio of 1:4, what is the transformer's power
ratio? - ANSWERS-the power ratio of the transformer would be 1:1
END OF
PAGE
2
, ELE 146 EXAM LATEST
If a transformer has a turns ratio of 1:4 and 115 V is applied to the
primary, how many volts are on the secondary? - ANSWERS-460 V.
Why are transformer iron cores laminated? - ANSWERS-To minimize
current loss.
What type of electrical service is the most common for residential
dwellings? - ANSWERS-120/240.
Why do control transformers usually have two primary coils? -
ANSWERS-To allow both primary coils to be connected to the
transformer.
What do "X" markings on a transformer represent? - ANSWERS-Low
voltage.
What do "H" markings on a transformer represent? - ANSWERS-High
voltage.
When connecting the primary of a control transformer to high voltage,
are the coils connected in series or parallel? - ANSWERS-Series.
END OF
PAGE
3
