unit 12 TSSA UPDATED ACTUAL Exam
Questions and CORRECT Answers
which is the main type of control module - CORRECT ANSWER - -intermitted pilot
-direct spark ignition
-hot surface ignition
-any of the above
the burner is operating, the heat exchanger temperature is above the fan-on setpoint and the fan
switch contacts are open. what should be done - CORRECT ANSWER - replace the fan
switch
meter is connected to MV and common. what is he checking - CORRECT ANSWER -
checking power to main valve
what feature acts as extra protection on a redundant gas valve - CORRECT ANSWER -a
second shut off valve
what supervises the operation of gas-fired equipment if an unsafe condition is present -
CORRECT ANSWER - the high limit
what type of single-phase motor is commonly used in the gas Industry - CORRECT
ANSWER - -split-phase indiction motor
-resistive start motor
-capacitor-start motor
-any of the above
meter is connected to the 24v side of the transformer one lead on common and the other is on the
thermostat - CORRECT ANSWER - check for open thermostat contacts
, meter is connected to 24v gas valve and to common - CORRECT ANSWER - check for
power to main valve
meter is connected to 24v secondary transformer side, one terminal connected both sides of
thermostat contacts - CORRECT ANSWER - check for open thermostat contacts
what component produces electricity when heated - CORRECT ANSWER --
thermocouple
-thermopile
a dot shown where wires cross on a wiring diagram means what - CORRECT ANSWER -
the wires are connected
meter is connected to the 24v side of S89 gas valve and to common - CORRECT
ANSWER - check S89 terminals for power to redundant gas valve
what dose a basic combination gas valve include - CORRECT ANSWER - manual shut-
off valve; automatic gas valve; pressure regulator
what dose a schematic diagram show - CORRECT ANSWER - -the power source
-how current flows through the various parts of the circuit
meter is connected to both open contacts of the thermostat; what is it testing - CORRECT
ANSWER -
what diagram is used to show the sequence of operation - CORRECT ANSWER -
schematic diagram
what three steps should be taken when troubleshooting - CORRECT ANSWER - make a
trial run; test your conclusions; correct the conditions
Questions and CORRECT Answers
which is the main type of control module - CORRECT ANSWER - -intermitted pilot
-direct spark ignition
-hot surface ignition
-any of the above
the burner is operating, the heat exchanger temperature is above the fan-on setpoint and the fan
switch contacts are open. what should be done - CORRECT ANSWER - replace the fan
switch
meter is connected to MV and common. what is he checking - CORRECT ANSWER -
checking power to main valve
what feature acts as extra protection on a redundant gas valve - CORRECT ANSWER -a
second shut off valve
what supervises the operation of gas-fired equipment if an unsafe condition is present -
CORRECT ANSWER - the high limit
what type of single-phase motor is commonly used in the gas Industry - CORRECT
ANSWER - -split-phase indiction motor
-resistive start motor
-capacitor-start motor
-any of the above
meter is connected to the 24v side of the transformer one lead on common and the other is on the
thermostat - CORRECT ANSWER - check for open thermostat contacts
, meter is connected to 24v gas valve and to common - CORRECT ANSWER - check for
power to main valve
meter is connected to 24v secondary transformer side, one terminal connected both sides of
thermostat contacts - CORRECT ANSWER - check for open thermostat contacts
what component produces electricity when heated - CORRECT ANSWER --
thermocouple
-thermopile
a dot shown where wires cross on a wiring diagram means what - CORRECT ANSWER -
the wires are connected
meter is connected to the 24v side of S89 gas valve and to common - CORRECT
ANSWER - check S89 terminals for power to redundant gas valve
what dose a basic combination gas valve include - CORRECT ANSWER - manual shut-
off valve; automatic gas valve; pressure regulator
what dose a schematic diagram show - CORRECT ANSWER - -the power source
-how current flows through the various parts of the circuit
meter is connected to both open contacts of the thermostat; what is it testing - CORRECT
ANSWER -
what diagram is used to show the sequence of operation - CORRECT ANSWER -
schematic diagram
what three steps should be taken when troubleshooting - CORRECT ANSWER - make a
trial run; test your conclusions; correct the conditions
