GAS 3 FINAL EXAM QUESTIONS AND
ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT !!!
1. Measuring Voltage and Resistance
The voltage reading across an open switch of an energized (12V) circuit
should be?
A. 0V
B. 6V
C. Applied Voltage (12V)
D. Infinity
The Logic: In an open circuit, the switch acts as an infinite resistance. Since no
current is flowing ($I = 0$), there is no voltage drop across the load. Therefore, a
multimeter placed across the open switch will read the full potential of the source
(the Applied Voltage).
Resistance in a circuit is measured by using a?
A. Voltmeter
B. Ammeter
C. Ohm meter
D. Wattmeter
Safety Tip: Always ensure the circuit is de-energized (power off) before using an
Ohm meter, or you risk damaging the meter and getting an inaccurate reading.
2. Current and Power Basics
When the circuit flows in one direction while maintaining a constant voltage,
it is called?
A. Alternating Current (AC)
B. Direct Voltage/Current (DC)
, C. Series Circuit
D. Parallel Circuit
Example: Batteries and solar cells provide Direct Current (DC). The medical gas
alarm panels often convert the building's AC power into DC for the internal logic
boards.
One horsepower (HP) of mechanical power is equal to _______ watts of
electrical power?
A. 100
B. 500
C. 746 (often rounded to 750 in simplified tests)
D. 1000
Technical Note: The exact conversion is
$$1 \text{ HP} = 746 \text{ Watts}$$
. If your test uses 750, it is using a common "rule of thumb" for quick calculations.
3. Wiring Standards
The number of conductors in a number 14/2 gauge wire is?
A. 1
B. 2
C. 3
D. 14
How to Read Wire: In the designation 14/2, the first number is the Gauge
(thickness), and the second number is the number of insulated current-carrying
conductors.
Note: A 14/2 cable actually has 3 physical wires inside (Black, White, and a
bare Copper ground), but the ground is not counted as a "conductor" in the
naming convention.
, Transformers that share a winding or portion of winding are called? -ANSWER
✔✔Auto transformer
The two most important ratings of a capacitor are? -ANSWER ✔✔Volts and
Microfarads
Voltage meters are read in ____ with the load? -ANSWER ✔✔Parallel
Operating controls govern the operation of an electrical load and are always shown
in ______ position? -ANSWER ✔✔Normally Open
One watt is equal how many BTU's? -ANSWER ✔✔3.41
On a 120v receptacle the hotline connection are? -ANSWER ✔✔Gold
What is the amount of amperage that could kill a person? -ANSWER ✔✔Lowest
amount
An electron has a ____ charge. -ANSWER ✔✔Negative
In line amp meters are always read in ____ with a load -ANSWER ✔✔Series
On a 120v receptacle the neutral line connection terminals are? -ANSWER
✔✔Silver
ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT !!!
1. Measuring Voltage and Resistance
The voltage reading across an open switch of an energized (12V) circuit
should be?
A. 0V
B. 6V
C. Applied Voltage (12V)
D. Infinity
The Logic: In an open circuit, the switch acts as an infinite resistance. Since no
current is flowing ($I = 0$), there is no voltage drop across the load. Therefore, a
multimeter placed across the open switch will read the full potential of the source
(the Applied Voltage).
Resistance in a circuit is measured by using a?
A. Voltmeter
B. Ammeter
C. Ohm meter
D. Wattmeter
Safety Tip: Always ensure the circuit is de-energized (power off) before using an
Ohm meter, or you risk damaging the meter and getting an inaccurate reading.
2. Current and Power Basics
When the circuit flows in one direction while maintaining a constant voltage,
it is called?
A. Alternating Current (AC)
B. Direct Voltage/Current (DC)
, C. Series Circuit
D. Parallel Circuit
Example: Batteries and solar cells provide Direct Current (DC). The medical gas
alarm panels often convert the building's AC power into DC for the internal logic
boards.
One horsepower (HP) of mechanical power is equal to _______ watts of
electrical power?
A. 100
B. 500
C. 746 (often rounded to 750 in simplified tests)
D. 1000
Technical Note: The exact conversion is
$$1 \text{ HP} = 746 \text{ Watts}$$
. If your test uses 750, it is using a common "rule of thumb" for quick calculations.
3. Wiring Standards
The number of conductors in a number 14/2 gauge wire is?
A. 1
B. 2
C. 3
D. 14
How to Read Wire: In the designation 14/2, the first number is the Gauge
(thickness), and the second number is the number of insulated current-carrying
conductors.
Note: A 14/2 cable actually has 3 physical wires inside (Black, White, and a
bare Copper ground), but the ground is not counted as a "conductor" in the
naming convention.
, Transformers that share a winding or portion of winding are called? -ANSWER
✔✔Auto transformer
The two most important ratings of a capacitor are? -ANSWER ✔✔Volts and
Microfarads
Voltage meters are read in ____ with the load? -ANSWER ✔✔Parallel
Operating controls govern the operation of an electrical load and are always shown
in ______ position? -ANSWER ✔✔Normally Open
One watt is equal how many BTU's? -ANSWER ✔✔3.41
On a 120v receptacle the hotline connection are? -ANSWER ✔✔Gold
What is the amount of amperage that could kill a person? -ANSWER ✔✔Lowest
amount
An electron has a ____ charge. -ANSWER ✔✔Negative
In line amp meters are always read in ____ with a load -ANSWER ✔✔Series
On a 120v receptacle the neutral line connection terminals are? -ANSWER
✔✔Silver
