G2 Exam Prep Latest Updated Graded
A+ (Verified)
________________ is the principle of thermal expansion of solid.
a.
Metal contract when heated and expand when cooled
b.
Metal melt while heated and contract when cooled
c.
Metal expands when heated and contract when cooled
d.
All of the above. - ANSWER-Metal expands when heated and contract when cooled
15 psi is equivalent to?
a.
15 feet of head
b.
34.5 feet of head
c.
420 feet of head
d.
1.87 feet of head - ANSWER-34.5 feet of head (PSI*2.31)
3/8 NPS black iron pipe shall?
a. Not be used for propane
b. Not be used in a concealed location
c. Not be used for natural gas
d. Not be used for indoors - ANSWER-Not be used in a concealed location (6.3.9)
A _______________ is a device that changes its electrical resistance with a change in
temperature.
a.
Diode
,b.
Thermopile
c.
Thermocouple
d.
Thermistor - ANSWER-Thermistor
A "0" reading across a closed switch indicates?
a. The switch is shorted out
b. The switch is faulty
c. The switch is good
d. The switch burned out - ANSWER-The switch is faulty
A 90,000 BTU Category IV furnace shall have a minimum vent termination distance
from a Window or door of?
a.
2400mm (96 in)
b.
900mm (36 in)
c.
300mm (12 in)
d.
1800m111(72 in) - ANSWER-300mm (12 in) (8.14.8)
A certified power venter that is used as an add-on to a water heater can only be used if
the input does not exceed:
a.
60,000 Btuh
b.
75,000 Btuh
c.
70,000 Btuh
d.
50,000 Btuh - ANSWER-50,000 Btuh (8.29.2)
,A combination fan limit control on a residential warm air furnace shuts the fan off after
completing the heating cycle at?
a. 75 °F
b. 250°F
c. 90°F
d. 140°F - ANSWER-90°F
A converted boiler shall be installed with _______________ minimum clearances from
the sides and rear to a combustible material?
a.
48 in (1200 mm)
b.
18 in (450 mm)
c.
1 in (25 mm)
d.
6 in (150 mm) - ANSWER-18 in (450 mm) (7.1.3)
A corrugated metal gas connector connected to a range must not exceed?
a. 6'
b. 5'
c. 3'
d. 4' - ANSWER-6' (6.21.3)
A device that only allows current to flow in one direction is called?
a. Resistor
b. Check valve
c. Diode
d. DC voltmeter - ANSWER-Diode
A direct spark ignition control module has terminals for:
a.
All of the above
b.
Input rating, Main switch, Thermostat, Blower, Safety switch
c.
, Ground, Igniter-sensor, Input power, Main gas valve.
d.
Fan switch, Gas valve, Thermocouple, Pilot - ANSWER-Ground, Igniter-sensor, Input
power, Main gas valve.
A dirt pockets shall be installed at the bottom of any piping or tubing, on the final drop
serving an appliance other than a(n)
a. Unit Heater
b. Furnace
c. Clothes dryer
d. Boiler - ANSWER-Clothes dryer (6.13.1)
A domestic water heater utilizes what thermostatic control?
a.
Thermistor
b.
Rod and tube sensor
c.
Mercury filled sensor
d.
Bi-metallic sensor - ANSWER-Rod and tube sensor
A fire tube boiler will have:
a.
The flue gases mixed with the medium been heated
b.
The flue gases inside the tube and water outside the tube
c.
A fast heat recovery time
d.
Water inside the tube and the flue gases outside the tube - ANSWER-The flue gases
inside the tube and water outside the tube
A flue gas discharge opening for an outdoor pool heater shall terminate not less than
___ from any building opening?
A+ (Verified)
________________ is the principle of thermal expansion of solid.
a.
Metal contract when heated and expand when cooled
b.
Metal melt while heated and contract when cooled
c.
Metal expands when heated and contract when cooled
d.
All of the above. - ANSWER-Metal expands when heated and contract when cooled
15 psi is equivalent to?
a.
15 feet of head
b.
34.5 feet of head
c.
420 feet of head
d.
1.87 feet of head - ANSWER-34.5 feet of head (PSI*2.31)
3/8 NPS black iron pipe shall?
a. Not be used for propane
b. Not be used in a concealed location
c. Not be used for natural gas
d. Not be used for indoors - ANSWER-Not be used in a concealed location (6.3.9)
A _______________ is a device that changes its electrical resistance with a change in
temperature.
a.
Diode
,b.
Thermopile
c.
Thermocouple
d.
Thermistor - ANSWER-Thermistor
A "0" reading across a closed switch indicates?
a. The switch is shorted out
b. The switch is faulty
c. The switch is good
d. The switch burned out - ANSWER-The switch is faulty
A 90,000 BTU Category IV furnace shall have a minimum vent termination distance
from a Window or door of?
a.
2400mm (96 in)
b.
900mm (36 in)
c.
300mm (12 in)
d.
1800m111(72 in) - ANSWER-300mm (12 in) (8.14.8)
A certified power venter that is used as an add-on to a water heater can only be used if
the input does not exceed:
a.
60,000 Btuh
b.
75,000 Btuh
c.
70,000 Btuh
d.
50,000 Btuh - ANSWER-50,000 Btuh (8.29.2)
,A combination fan limit control on a residential warm air furnace shuts the fan off after
completing the heating cycle at?
a. 75 °F
b. 250°F
c. 90°F
d. 140°F - ANSWER-90°F
A converted boiler shall be installed with _______________ minimum clearances from
the sides and rear to a combustible material?
a.
48 in (1200 mm)
b.
18 in (450 mm)
c.
1 in (25 mm)
d.
6 in (150 mm) - ANSWER-18 in (450 mm) (7.1.3)
A corrugated metal gas connector connected to a range must not exceed?
a. 6'
b. 5'
c. 3'
d. 4' - ANSWER-6' (6.21.3)
A device that only allows current to flow in one direction is called?
a. Resistor
b. Check valve
c. Diode
d. DC voltmeter - ANSWER-Diode
A direct spark ignition control module has terminals for:
a.
All of the above
b.
Input rating, Main switch, Thermostat, Blower, Safety switch
c.
, Ground, Igniter-sensor, Input power, Main gas valve.
d.
Fan switch, Gas valve, Thermocouple, Pilot - ANSWER-Ground, Igniter-sensor, Input
power, Main gas valve.
A dirt pockets shall be installed at the bottom of any piping or tubing, on the final drop
serving an appliance other than a(n)
a. Unit Heater
b. Furnace
c. Clothes dryer
d. Boiler - ANSWER-Clothes dryer (6.13.1)
A domestic water heater utilizes what thermostatic control?
a.
Thermistor
b.
Rod and tube sensor
c.
Mercury filled sensor
d.
Bi-metallic sensor - ANSWER-Rod and tube sensor
A fire tube boiler will have:
a.
The flue gases mixed with the medium been heated
b.
The flue gases inside the tube and water outside the tube
c.
A fast heat recovery time
d.
Water inside the tube and the flue gases outside the tube - ANSWER-The flue gases
inside the tube and water outside the tube
A flue gas discharge opening for an outdoor pool heater shall terminate not less than
___ from any building opening?
