Bimetal elements in room thermostats are usually _____.

Bimetal elements in room thermostats are usually _____.
 
  a. copper-plated
  b. heat-treated
  c. spiral-wound
  d. made of steel

---

[Ques. 2] All of the following are inductive loads found in HVAC equipment except _____.
 
  a. solenoid valves
  b. relays
  c. fan motors
  d. crankcase heaters

---

[Ques. 3] A thermistor that increases its resistance as temperature rises is said to have a _____.
 
  a. high temperature coefficient
  b. positive coefficient of resistance
  c. negative coefficient of resistance
  d. coefficient of high resistance

---

[Ques. 4] A pneumatic controller that increases the pressure of its branch line when air temperature in the conditioned
  space goes up is called a(n) _____.
 
  a. direct-acting thermostat
  b. reverse-acting thermostat
  c. graduate thermometer
  d. E-P relay

---

[Ques. 5] Why is 24V used in control circuits?
 
  a. Components are easy to install.
  b. Alternating current is not needed.
  c. It allows battery back-up.
  d. Electric shocks are eliminated.