C20 Practice Test Exam Questions And Answers.
What is the best way to maintain a drive belt motor setup?
A. according to manufacturer's manual
B. according to experience with own drive belt motor
C. replace bearings every 6 months
D. replace bearings every 12 months - A. According to manufacturer's manual
Silver solder starts to flow at or above approximately what temperature?
A. 1000°F
B. 1150°F
C. 1350°F
D. 1400°F - B. 1150 F
How are fuses rated?
A. ohms
B. watts
C. amps
D. kilowatts - C. Amps
If the side rail of a ladder is split away from the rungs, what should you do with the ladder?
A. Discard
B. Tie railing together with wire
,C. Use special reinforcement to attach
D. Cut in half to make two smaller ladders - A. Discard
The drawing shows a heating equipment closet in a residential basement. Two ventilating grilles are
shown. Which of the following statements is correct?
A. neither grille is required
B. only grille A is required
C. only grille B is required
D. both grilles are required - D. Both grilles are required
What would you use to remove a screw or a bolt that has worn out due to fatigue and rust?
A. Jaw grip wrench
B. Cold chisel
C. Apply more force to the wrench
D. use two wrenches, holding one stationary, while using the other to twist - B. Cold chisel
How high must a 12" diameter flue pipe project above a pitched roof line?
A. 1 ft
B. 2 ft
C. 3 ft
D. 4 ft - B. 2 ft
A difference between a gravity-type heating system and a forced-air system is that the gravity-type
relies on the _____ for air distribution. - C. Difference between hot and cold air
In a central A/C unit that uses a large volume fan, how can you reduce the noise?
, A. use a silencer
B. use sound dampening material to make a resilient mounting base
C. use a rigid direct drive coupling
D. place adjacent to the most important living areas - B. use sound dampening material to make
resilient mounting base
How do you add moisture to a space?
A. humidifier
B. dehumidifier
C. duct damper
D. hydro couple - A. Humidifer
Which wire can carry the most current?
A. 4 AWG
B. 6 AWG
C. 8 AWG
D. 10 AWG - A. 4 AWG
Where should you locate registers for a forced warm-air system?
A. along an outside wall
B. along an inside wall
C. high on a wall
D. on the floor or low on a wall - C. high on a wall
Which of the following affects temperature in a room?
A. radiation
What is the best way to maintain a drive belt motor setup?
A. according to manufacturer's manual
B. according to experience with own drive belt motor
C. replace bearings every 6 months
D. replace bearings every 12 months - A. According to manufacturer's manual
Silver solder starts to flow at or above approximately what temperature?
A. 1000°F
B. 1150°F
C. 1350°F
D. 1400°F - B. 1150 F
How are fuses rated?
A. ohms
B. watts
C. amps
D. kilowatts - C. Amps
If the side rail of a ladder is split away from the rungs, what should you do with the ladder?
A. Discard
B. Tie railing together with wire
,C. Use special reinforcement to attach
D. Cut in half to make two smaller ladders - A. Discard
The drawing shows a heating equipment closet in a residential basement. Two ventilating grilles are
shown. Which of the following statements is correct?
A. neither grille is required
B. only grille A is required
C. only grille B is required
D. both grilles are required - D. Both grilles are required
What would you use to remove a screw or a bolt that has worn out due to fatigue and rust?
A. Jaw grip wrench
B. Cold chisel
C. Apply more force to the wrench
D. use two wrenches, holding one stationary, while using the other to twist - B. Cold chisel
How high must a 12" diameter flue pipe project above a pitched roof line?
A. 1 ft
B. 2 ft
C. 3 ft
D. 4 ft - B. 2 ft
A difference between a gravity-type heating system and a forced-air system is that the gravity-type
relies on the _____ for air distribution. - C. Difference between hot and cold air
In a central A/C unit that uses a large volume fan, how can you reduce the noise?
, A. use a silencer
B. use sound dampening material to make a resilient mounting base
C. use a rigid direct drive coupling
D. place adjacent to the most important living areas - B. use sound dampening material to make
resilient mounting base
How do you add moisture to a space?
A. humidifier
B. dehumidifier
C. duct damper
D. hydro couple - A. Humidifer
Which wire can carry the most current?
A. 4 AWG
B. 6 AWG
C. 8 AWG
D. 10 AWG - A. 4 AWG
Where should you locate registers for a forced warm-air system?
A. along an outside wall
B. along an inside wall
C. high on a wall
D. on the floor or low on a wall - C. high on a wall
Which of the following affects temperature in a room?
A. radiation
