Power Engineering 4th Class - Part B
– 11th Unit |Review Questions With All
Answers |Correct And Verified
_____ are often used to aid the return of condensate through the return
piping of large complexes.
Select one:
a. Vacuum pumps
b. Vacuum breakers
c. Boiler feed pumps
d. Vacuum injectors - Ans--Vacuum pumps
Thermal conductivity (λ) is the:
Select one:
a. Reciprocal of the U-factor.
b. Heat transfer through a one-metre cross-sectional area of a uniform
material, in W/m2K
c. Quantity of heat flow per unit time (in Watts)
d. Conductive heat transfer through a unit thickness of a single uniform type
of material - Ans--Conductive heat transfer through a unit thickness of a
single uniform type of material
Heat load from people in a room is mostly affected by:
Select one:
a. The building occupancy class
b. The activity of the people
c. The number of people
d. The age of the people - Ans--The activity of the people
What return air conditions are detected to adjust the amount of fresh
admitted into an HVAC system?
Select one:
a. CO and O2
b. building static pressureand return air temperature
, c. CO and CO2
d. CO2 and O2 - Ans--CO and CO2
All supply and drain lines of a steam heating system must be pitched to:
Select one:
a. Allow for thermal expansion
b. Prevent corrosion
c. Allow collection of air at the highest points
d. Allow for drainage of condensate - Ans--Allow for drainage of condensate
At what outside air temperature would the steam valve, supplying the first
preheat coil, be 50% open?
Select one:
a. 1.5°C
b. -18°C
c. 3.5°C
d. 14°C - Ans--1.5°C
The ventilation rate of a building is determined based upon the greater of the
Select one:
a. Infiltration rate and CFM rate per person
b. CFM rate and conduction rate per person
c. Conduction rate per person and solar heat rate
d. Solar heat rate and CFM rate per person - Ans--Infiltration rate and CFM
rate per person
The packless radiator valve has a bronze diaphragm that completely seals
off the valve body, to prevent:
Select one:
a. Differential pressure from changing the valve setting
b. Steam leaking out around the valve stem
c. Air from entering the radiator
d. Air leaking out around the valve stem - Ans--Air leaking out around the
valve stem
In an open wire type heating element, the resistance wire is made of:
Select one:
a. Mica
– 11th Unit |Review Questions With All
Answers |Correct And Verified
_____ are often used to aid the return of condensate through the return
piping of large complexes.
Select one:
a. Vacuum pumps
b. Vacuum breakers
c. Boiler feed pumps
d. Vacuum injectors - Ans--Vacuum pumps
Thermal conductivity (λ) is the:
Select one:
a. Reciprocal of the U-factor.
b. Heat transfer through a one-metre cross-sectional area of a uniform
material, in W/m2K
c. Quantity of heat flow per unit time (in Watts)
d. Conductive heat transfer through a unit thickness of a single uniform type
of material - Ans--Conductive heat transfer through a unit thickness of a
single uniform type of material
Heat load from people in a room is mostly affected by:
Select one:
a. The building occupancy class
b. The activity of the people
c. The number of people
d. The age of the people - Ans--The activity of the people
What return air conditions are detected to adjust the amount of fresh
admitted into an HVAC system?
Select one:
a. CO and O2
b. building static pressureand return air temperature
, c. CO and CO2
d. CO2 and O2 - Ans--CO and CO2
All supply and drain lines of a steam heating system must be pitched to:
Select one:
a. Allow for thermal expansion
b. Prevent corrosion
c. Allow collection of air at the highest points
d. Allow for drainage of condensate - Ans--Allow for drainage of condensate
At what outside air temperature would the steam valve, supplying the first
preheat coil, be 50% open?
Select one:
a. 1.5°C
b. -18°C
c. 3.5°C
d. 14°C - Ans--1.5°C
The ventilation rate of a building is determined based upon the greater of the
Select one:
a. Infiltration rate and CFM rate per person
b. CFM rate and conduction rate per person
c. Conduction rate per person and solar heat rate
d. Solar heat rate and CFM rate per person - Ans--Infiltration rate and CFM
rate per person
The packless radiator valve has a bronze diaphragm that completely seals
off the valve body, to prevent:
Select one:
a. Differential pressure from changing the valve setting
b. Steam leaking out around the valve stem
c. Air from entering the radiator
d. Air leaking out around the valve stem - Ans--Air leaking out around the
valve stem
In an open wire type heating element, the resistance wire is made of:
Select one:
a. Mica
