CWEA E1 Study Set
If transformer primary=120v and secondary 12v=20 amps, what are the amps on the primary? -
correct answer 2 amps.
Formula:
I =Amps/Volume of current
E = Volts/Force moving the current
P = Watts, Electrical power produced
I x E=P
12 x 20=240watts
In a transformer watts stay the same so now:
P/E=I
240/120v=2 amps
If 17.32v are applied across a resistance of 50 ohms, how much power is expended in the
resistor? - correct answer 6.0 watts.
Formula: V squared/R = P
17.32 squared(299.98)/50=5.99
Confined Space - correct answer A space that:
-is large enough to enter and work.
-has limited or restricted means for entry.
-is not designed for continuous occupancy.
Hot Work Permit - correct answer An employer's written authorization to perform work capable
of providing a source of ignition.
Inerting - correct answer A form of purging or ventilating a confined space where an inert gas
(such as nitrogen, carbon dioxide or argon) is used to displace the atmosphere in a confined
, CWEA E1 Study Set
space to remove fire or explosion hazards. Causes oxygen levels to become unstable for re-
entry.
Oxygen Safe Zone - correct answer 19.5% to 23.5%
Below 19.5=unsafe for breathing
Above 23.5=explosive
Leader Line - correct answer The part or area of a drawing to which a number, note or other
reference applies. They are solid lines and usually terminate in a single arrowhead.
Hydraulic Term:
"Resistance" - correct answer A construction in the bore of the pipe which requires more
pressure to pass the same amount of water.
Hydraulic Term:
"Voltage"
(Assume water is flowing horizontally so gravity isn't a factor) - correct answer Electric potential
is equivalent to pressure and the voltage (or voltage drop/potential difference) is the difference
in pressure between two points.
Hydraulic Term:
"Current" - correct answer Equivalent to a hydraulic volume flow rate; that is the volumetric
quantity of flowing water over time.
Ohm's Law - correct answer Current through a conductor between two points is directly
proportional to the voltage across the two points.
S.O.P. - correct answer Standard operating procedure.
If transformer primary=120v and secondary 12v=20 amps, what are the amps on the primary? -
correct answer 2 amps.
Formula:
I =Amps/Volume of current
E = Volts/Force moving the current
P = Watts, Electrical power produced
I x E=P
12 x 20=240watts
In a transformer watts stay the same so now:
P/E=I
240/120v=2 amps
If 17.32v are applied across a resistance of 50 ohms, how much power is expended in the
resistor? - correct answer 6.0 watts.
Formula: V squared/R = P
17.32 squared(299.98)/50=5.99
Confined Space - correct answer A space that:
-is large enough to enter and work.
-has limited or restricted means for entry.
-is not designed for continuous occupancy.
Hot Work Permit - correct answer An employer's written authorization to perform work capable
of providing a source of ignition.
Inerting - correct answer A form of purging or ventilating a confined space where an inert gas
(such as nitrogen, carbon dioxide or argon) is used to displace the atmosphere in a confined
, CWEA E1 Study Set
space to remove fire or explosion hazards. Causes oxygen levels to become unstable for re-
entry.
Oxygen Safe Zone - correct answer 19.5% to 23.5%
Below 19.5=unsafe for breathing
Above 23.5=explosive
Leader Line - correct answer The part or area of a drawing to which a number, note or other
reference applies. They are solid lines and usually terminate in a single arrowhead.
Hydraulic Term:
"Resistance" - correct answer A construction in the bore of the pipe which requires more
pressure to pass the same amount of water.
Hydraulic Term:
"Voltage"
(Assume water is flowing horizontally so gravity isn't a factor) - correct answer Electric potential
is equivalent to pressure and the voltage (or voltage drop/potential difference) is the difference
in pressure between two points.
Hydraulic Term:
"Current" - correct answer Equivalent to a hydraulic volume flow rate; that is the volumetric
quantity of flowing water over time.
Ohm's Law - correct answer Current through a conductor between two points is directly
proportional to the voltage across the two points.
S.O.P. - correct answer Standard operating procedure.
