ESET 444 EXAM 1 QUESTIONS AND ANSWERS
100% CORRECT
In addition to charging for peak demand, some utilities charge for kvars. What does the
"R" stand for in "kvar?" - answer Reactive
An electric motor has input power rating of 250 kW. If the output power at fully rated
load is 200 kW, what is the efficiency
of the motor? - answer 80%
Why could the energy content of a fuel have a different value reported in the US
compared to Europe? - answer The US typically uses higher heating value, which
includes the energy contained in water vapour. Europe typically uses
lower heating value, which does not include the heat associated with water changing
state.
A factory uses 3000 therms / 8330 cubic metres of natural gas each month. The gas
costs 72 cents per therm / 26 cents
per cubic metre. The energy value of the gas is 10.5 kWh per cubic metre. A kWh of
electricity costs 7c. Should the site
switch from natural gas to electricity, assuming that the efficiency remains the same? -
answer No, the same energy value of electricity costs more
Which term describes a fuel that contains energy source that has not undergone any
conversion - answer Primary
On a particular day the temperature monitoring system registered 7 cooling degree
days. What does this mean? - answer The mean temperature was 7 degrees above the
base temperature
In both the US customary and SI systems, electricity is expressed using which of the
following terms? - answer Watts (kilowatts)
Which unit of measurement is generally used to measure energy content? - answer
British Thermal Units (US) joules (SI)
A resistance of 500 ohms has a measured voltage drop of 120v. How much power is
driving the current? - answer 28.8 watts
A resistance of 100 ohms has 4 amps flowing through it. What is the voltage drop across
the resistance? - answer 400 volts
,When making efficiency improvements, passive and active efficiency measures should
always be followed by which of the following in order to sustain savings? - answer
Monitoring
Installing occupancy and light-level sensors and implementing variable frequency drives
in motors are examples of which
type of efficiency measure? - answer Active
Which of the following is the name for an analysis of a building's energy use where
opportunities for reducing energy consumption are identified and prioritized? - answer
Energy audit
How much energy efficiency improvement can be achieved with current technologies? -
answer Up to 30%
Replacing existing equipment with lower consumption devices, fixing leaks and adding
insulation are examples of which type of efficiency measure? - answer Passive
Why is energy efficiency at the point of use the quickest, cleanest, most effective
solution to the energy dilemma? - answer ( )Because due to transmission and generation
losses, 300 units of primary energy are required to provide 100 units of
end-user electricity. Hence saving energy at the point of use is more effective than
building a new power plant with double
the efficiency
( )Because the cleanest unit of energy is a unit of energy that wasn't produced and used
( )Because energy efficiency solutions are available now
( )Because energy projects are low risk and outperform many other investments
(x)All of the above ← Correct answer
Energy efficiency can be defined as: - answer Reducing the amount of energy used
while maintaining outcomes: doing more with less
What is the energy dilemma? - answer Energy demand is forecast to double, while
emissions have to be cut by half to avoid dramatic climate change
What percentage of energy consumption is used by industry, residences and tertiary
buildings? - answer 72%
"You can't manage what you don't measure". Which of the following helps you overcome
this issue regarding energy? - answer Energy management software
The purpose of a building control system is to measure environmental data (E.g.
temperature, humidity, pressure, or flow rate), compare that data against
, predetermined standards and initiate a change in order to change or maintain current
environmental conditions. - answer True
A simple ______________ is defined as one input to a controller housing the control logic,
which provides an output to one controlled device. - answer Control loop
What provides data to the controller? - answer Input devices such as sensors or contact
closures
Which control system component interprets the input according to its control logic? -
answer Controller
Which control system component is activated in order to change or maintain
environmental conditions? - answer Controlled device
This is the type of control loop where the output has no effect on the controlling variable
- answer Open
Another name for a cascade control loop is: - answer Reset control loop
This is the type of control loop where the controlling variable is affected by the actions
of the controlled device upon the
controlled variable. - answer Closed
This is the type of control loop used to modify the performance of closed control loops
when required - answer Cascading
HVAC includes which processes? - answer Heating, cooling, humidifying,
dehumidifying, cleaning, ventilating and air movement
An HVAC all-air system brings in outdoor air for ventilation, provides treated supply air
to the conditioned space, removes
return air from the space, and vents relief or exhaust air to the outside - answer True
A typical configuration for a split system is - answer Compressor and condenser outside
the building on the ground or roof; evaporator and air handlers inside the
building
100% CORRECT
In addition to charging for peak demand, some utilities charge for kvars. What does the
"R" stand for in "kvar?" - answer Reactive
An electric motor has input power rating of 250 kW. If the output power at fully rated
load is 200 kW, what is the efficiency
of the motor? - answer 80%
Why could the energy content of a fuel have a different value reported in the US
compared to Europe? - answer The US typically uses higher heating value, which
includes the energy contained in water vapour. Europe typically uses
lower heating value, which does not include the heat associated with water changing
state.
A factory uses 3000 therms / 8330 cubic metres of natural gas each month. The gas
costs 72 cents per therm / 26 cents
per cubic metre. The energy value of the gas is 10.5 kWh per cubic metre. A kWh of
electricity costs 7c. Should the site
switch from natural gas to electricity, assuming that the efficiency remains the same? -
answer No, the same energy value of electricity costs more
Which term describes a fuel that contains energy source that has not undergone any
conversion - answer Primary
On a particular day the temperature monitoring system registered 7 cooling degree
days. What does this mean? - answer The mean temperature was 7 degrees above the
base temperature
In both the US customary and SI systems, electricity is expressed using which of the
following terms? - answer Watts (kilowatts)
Which unit of measurement is generally used to measure energy content? - answer
British Thermal Units (US) joules (SI)
A resistance of 500 ohms has a measured voltage drop of 120v. How much power is
driving the current? - answer 28.8 watts
A resistance of 100 ohms has 4 amps flowing through it. What is the voltage drop across
the resistance? - answer 400 volts
,When making efficiency improvements, passive and active efficiency measures should
always be followed by which of the following in order to sustain savings? - answer
Monitoring
Installing occupancy and light-level sensors and implementing variable frequency drives
in motors are examples of which
type of efficiency measure? - answer Active
Which of the following is the name for an analysis of a building's energy use where
opportunities for reducing energy consumption are identified and prioritized? - answer
Energy audit
How much energy efficiency improvement can be achieved with current technologies? -
answer Up to 30%
Replacing existing equipment with lower consumption devices, fixing leaks and adding
insulation are examples of which type of efficiency measure? - answer Passive
Why is energy efficiency at the point of use the quickest, cleanest, most effective
solution to the energy dilemma? - answer ( )Because due to transmission and generation
losses, 300 units of primary energy are required to provide 100 units of
end-user electricity. Hence saving energy at the point of use is more effective than
building a new power plant with double
the efficiency
( )Because the cleanest unit of energy is a unit of energy that wasn't produced and used
( )Because energy efficiency solutions are available now
( )Because energy projects are low risk and outperform many other investments
(x)All of the above ← Correct answer
Energy efficiency can be defined as: - answer Reducing the amount of energy used
while maintaining outcomes: doing more with less
What is the energy dilemma? - answer Energy demand is forecast to double, while
emissions have to be cut by half to avoid dramatic climate change
What percentage of energy consumption is used by industry, residences and tertiary
buildings? - answer 72%
"You can't manage what you don't measure". Which of the following helps you overcome
this issue regarding energy? - answer Energy management software
The purpose of a building control system is to measure environmental data (E.g.
temperature, humidity, pressure, or flow rate), compare that data against
, predetermined standards and initiate a change in order to change or maintain current
environmental conditions. - answer True
A simple ______________ is defined as one input to a controller housing the control logic,
which provides an output to one controlled device. - answer Control loop
What provides data to the controller? - answer Input devices such as sensors or contact
closures
Which control system component interprets the input according to its control logic? -
answer Controller
Which control system component is activated in order to change or maintain
environmental conditions? - answer Controlled device
This is the type of control loop where the output has no effect on the controlling variable
- answer Open
Another name for a cascade control loop is: - answer Reset control loop
This is the type of control loop where the controlling variable is affected by the actions
of the controlled device upon the
controlled variable. - answer Closed
This is the type of control loop used to modify the performance of closed control loops
when required - answer Cascading
HVAC includes which processes? - answer Heating, cooling, humidifying,
dehumidifying, cleaning, ventilating and air movement
An HVAC all-air system brings in outdoor air for ventilation, provides treated supply air
to the conditioned space, removes
return air from the space, and vents relief or exhaust air to the outside - answer True
A typical configuration for a split system is - answer Compressor and condenser outside
the building on the ground or roof; evaporator and air handlers inside the
building
