Chapter 96,97

Question 0

When air is forced through a heating coil, where the fan and coil are within the same unit, the unit is known as:
A) a unit heater
B) an injector
C) a diverted
D) a convector

Answer 0

A) a unit heater

Question 1

Convectors use \_\_\_\_\_\_ to increase heat transfer.
A) metal fins
B) a fan
C) larger surfaces
d) glycol/water mix

Answer 1

A) metal fins

Question 2

A radiator trap is a device used to:
A) allow only air to leave the radiator
B) vent steam from the radiator
C) depressurized a radiator
D) allow only water to leave the radiator

Answer 2

D) allow only water to leave the radiator

Question 3

The exhausted on an air separation tank consists of a series of \_\_\_\_\_\_ through which water is forced by the pump.
A) rings
B) nozzles
C) Venturi tubes
D) valves

Answer 3

B) nozzles

Question 4

Which of the following pieces of equipment is not a source of heat?
A) radiator
B) convector
C) air vent
D) unit ventilator

Answer 4

C) air vent

Question 5

In a gravity return system, the boiler should be placed:
A) well above the highest radiator
B) well below the lowest radiator
C) on an elevated platform
D) at the same level as the radiators

Answer 5

B) well below the lowest radiator

Question 6

A pressure balancing device that prevents the boiler pressure from forcing the water in the boiler into the return line is called a:
A) pressure equalizer
B) bleed valve
C) Hartford loop
D) pressure control valve

Answer 6

C) Hartford loop

Question 7

If the water level falls too low during operation of a steam heating boiler, the operator should:
A) lower the flame and add water to bring it up to a safe level
B) add more water immediately
C) operate the safety valve
D) shut down the boiler

Answer 7

D) shut down the boiler

Question 8

Steam in a two pipe, vacuum return system is supplied at a maximum pressure of:
A) 75 kPa (10 psi)
B) 50 kPa (7 psi)
C) 200 kPa (30 psi)
D) 103 kPa (15 psi)

Answer 8

D) 103 kPa (15 psi)

Question 9

A vacuum pump maintains a vacuum \_\_\_\_\_\_ kPa higher in the condensate return system than in the supply main.
A) 3-5
B) 7-10
C) 12-16
D) 20-25

Answer 9

B) 7-10

Question 10

Causes of insufficient steam supply to the heating units can be attributed to:
A) improper pitch
B) defective radiator valve
C) clogging of connections and valve
D) all of the above

Answer 10

D) all of the above