Gas Troubleshooting I
Gas Troubleshooting I
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Question 1 |
On a standing pilot furnace, the thermocouple must be replaced when
A | It is not positioned properly |
B | The millivolt reading is 28 or higher |
C | The millivolt reading is 22 or lower |
D | The tip of the thermocouple is in the pilot flame 3/8” |
Question 2 |
Natural gas pressure at the main line is recorded at 7" WC, but at the gas manifold it reads 1.5" WC. What is most likely to be the cause of this?
A | A defective main line regulator |
B | Too large of a gas valve |
C | Plugged burner orifices |
D | A defective pressure regulator at the gas valve |
Question 3 |
A technician servicing a gas fired furnace notices four out of five ribbons are firing simultaneously. What could the problem be?
A | Too much gas pressure |
B | Too little gas pressure |
C | Burners not aligned properly |
D | A defective gas valve |
Question 4 |
Technician A says that a combination gas valve needs to be replaced if there are 24v present to the valve and it will not open. Technician B says that if a combination gas valve has a new thermocouple and the pilot will not stay lit, the gas valve needs to be replaced. Which technician is correct
A | Tech A |
B | Tech B |
C | Both Techs are correct |
D | Both Techs are incorrect |
Question 5 |
What should be the first step that a technician should take if gas pressure at the manifold it too high?
A | Adjust the pressure regulator clockwise |
B | Adjust the pressure regulator counterclockwise |
C | Replace the pressure regulator |
D | Replace the combination gas valve |
Question 6 |
If the flame is lifting off a burner port, what should a technician do to correct this problem?
A | Adjust primary air by closing off the sir shutter |
B | Adjust primary air by opening the air shutter |
C | Replace the burner |
D | Decrease main gas pressure |
Question 7 |
A step down transformer is reading 0 ohms at its secondary winding. What is a possible cause for this problem?
A | An open primary winding |
B | An open secondary winding |
C | A shorted primary winding |
D | A shorted secondary winding |
Question 8 |
When a fan center relay needs to be tested for 24 v, what two terminals are used when measuring for transformer output voltage?
A | Terminals R and W |
B | Terminals R and G |
C | Terminals R and Y |
D | Terminals R and C |
Question 9 |
On a call for heat what two terminals should be closed on the thermostat?
A | Terminals R and W |
B | Terminals R and G |
C | Terminals R and Y |
D | Terminals R and C |
Question 10 |
When a thermostat subbase fan selector switch is moved to fan on, what terminals will close in the thermostat?
A | Terminals R and W |
B | Terminals R and G |
C | Terminals R and Y |
D | Terminals Rand C |
Question 11 |
A new thermostat was recently replaced. The tech observes that the burner cycle is not long enough the most likely cause would be
A | A defective thermostat |
B | Low gas pressure |
C | A defective gas valve |
D | faulty heat anticipator setting |
Question 12 |
A customer has replaced a mercury bulb thermostat but complains that the burners will not shut off and the house is getting too hot. The most likely cause would be
A | a defective limit control |
B | a defective gas valve |
C | that the thermostat is not properly level |
D | the anticipator is set too low |
Question 13 |
A bimetal fan control will not turn the indoor blower motor off. As a result, cool air passes through the registers between furnace cycles. What is a possible cause of this problem?
A | The heating circuit is opening on limit |
B | The fan control contacts are stuck open |
C | The fan control contacts are stuck closed |
D | There is a defective gas valve |
Question 14 |
Residents are complaining of experiencing symptoms of headaches, watery eyes and nausea. Tech A says the heat exchanger is possibly cracked. Tech B says that the furnace may only need cleaning and the heat exchanger is probably plugged. Which tech is correct?
A | Tech A |
B | Tech B |
C | Both techs are correct |
D | Both techs are incorrect |
Question 15 |
A belt drive motor has recently been replaced but the furnace is shutting off on limit control. The most likely cause is that
A | The motor is running in the wrong direction |
B | The motor is defective |
C | The motor is too large |
D | The motor mount is not correct |
Question 16 |
Upon testing a motor run winding for continuity, the technician records 3 ohms. The winding resistance should read 8 ohms the tech concludes that.
A | The winding is open |
B | The winding is shorted |
C | The winding is grounded |
D | The motor is within satisfactory operating conditions |
Question 17 |
A run capacitor is tested with an analog meter. The needle moves toward zero then deflects back to infinity. What is the condition of the capacitor?
A | The capacitor is open |
B | The capacitor is good |
C | The capacitor should not be used |
D | The capacitor needs to be of a higher mfd rating |
Question 18 |
The temperature rise of a particular furnace states that it should be between 35 and 65 F. the furnace is operating at 20 F temperature rise with the proper gas pressure at the manifold . What could be done to solve this problem?
A | Add more outside air to the basement |
B | Increase the indoor blower speed |
C | Decrease the indoor blower speed |
D | Replace the air filter with a more efficient type |
Question 19 |
A belt drive motor has been replaced, but quickly gets hot and stops just short of burning out, which of the following could cause this problem?
A | A fan belt that is too tightly adjusted |
B | A fan belt that has only 1” of slack between pulleys |
C | The pulley on the motor is too small |
D | None of the above |
Question 20 |
A combination fan/limit control has been replaced. The indoor blower motor runs too long and the resident complains of cooler airflow. The tech should?
A | Replace the control again |
B | Adjust the limit setting |
C | Lengthen the fan off setting |
D | Check and re-adjust the fan on/off differential |
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