The diaphragms of a diaphragm type of valve are made of: 1. ...

[lindiwe]

The diaphragms of a diaphragm type of valve are made of: 1. steel. 2. copper. 3. aluminum. 4. chrome-molybdenum.
 
  a. 2 c. 3 and 4
  b. 2 and 3 d. 1 and 2

Question 2

Which type of valve operates on the principle that as the pressure in a cylinder increases, the temperature of the gas increases?
 
  a. Direct-acting valves c. Rupture-disk pres-sure-relief valves
  b. Fusible-plug pres-sure-relief valves d. Spring-loaded pressure-relief valves

[SamMuagrove]

Answer to Question 1

ANS: D
The diaphragm type of valve has two diaphragms, one made of steel and one made of copper. Aluminum and chrome-molybdenum are metals that are used in the construction of cylinders.

Answer to Question 2

ANS: B
Fusible-plug pressure-relief valves operate on the principle that as the pressure in a tank increases, the temperature of the gas increases, causing the plug to melt. Spring-loaded devices are de-signed to release excessive cylinder pressure and reseal, preventing further release of gas from the cylinder after the cause of the excessive pressure is removed. The rupture-disk will buckle when the pressure inside the cylinder exceeds a certain predetermined limit. Direct-acting valves are not pressure-relief valves; instead, they are controlling devices that seal the contents of a com-pressed cylinder until it is ready for use.

[lindiwe]

TYSM

[ultraflyy23]

Excellent