Discover Q&A generated by AI Answer Generator

The correct answer is C. Mixing Box.

A mixing box is designed to blend cold and hot air streams while also helping to reduce noise associated with the mixing process.

A typical human in an office space will generate about 100-200 BTU/Hr. Therefore, the correct answer is:

B. 100-200 BTU/Hr.

A typical human in an office space will generate about 100-200 BTU/Hr. Therefore, the correct answer is B. 100-200 BTU/Hr.

The correct answer is A. Sensible heat.

Sensible heat refers to the heat that causes a change in temperature of a substance without changing its state (phase). In this case, since the water in the pipe has not changed state (remains liquid), the change in temperature is due to sensible heat.

The speed of a 3-phase AC motor is primarily controlled by adjusting:

D. hertz

In a 3-phase AC motor, the speed is directly related to the frequency of the AC supply (measured in hertz). By varying the frequency, you can control the speed of the motor. While voltage and current can also affect motor performance, frequency is the key factor in determining the speed of an AC

The best description of a fire tube boiler is:

B. Hot gases from combustion being drawn through tubes in a water bath.

In a fire tube boiler, the hot gases produced from combustion pass through tubes that are surrounded by water, which is heated to produce steam or hot water.

A. TRUE

Low humidity can lead to mold growth, stickiness between papers and on surfaces, and increased odors, especially in environments where moisture is trapped.

The correct options are:

B. Lowered productivity
C. Occupant dissatisfaction

Keeping an office space too warm or too cold, or having the wrong humidity levels can negatively impact employee comfort and performance, leading to decreased productivity and dissatisfaction among occupants. Options A and D are not typically associated with improper temperature or humidity levels.

C. FALSE

Cooling towers are typically used with water-cooled chillers, not air-cooled chillers. Air-cooled chillers use ambient air to dissipate heat, while cooling towers are part of a water-cooled system that uses water to absorb and remove heat.

In a chilled water system with condenser water, heat is finally removed from the building primarily through the cooling tower. Therefore, the correct answer is:

B. Through the Cooling Tower

In this system, the chiller removes heat from the building's chilled water, and this heat is then transferred to the condenser water. The cooling tower then dissipates this heat to the atmosphere, completing the heat removal process.

The correct options for why Mercury is often replaced by water in a manometer are:

A. Water is much less expensive than Mercury
D. Water is safer than Mercury

Explanation:

• A. Water is much less expensive than Mercury: Water is readily available and inexpensive compared to mercury, which is a toxic heavy metal.
• D. Water is safer than Mercury: Mercury is hazardous to health and the environment, while water is non-toxic and safe to handle.

Note on the other options:

• B. Water is much lighter than mercury: This is not a reason for replacement; in fact, mercury is denser than water, which is why it is often used in manometers for measuring pressure.
• C. Water is much more accurate than Mercury: This is not accurate; mercury's high density allows for more precise measurements in certain applications, although water can be used in less precise applications.

One ton of refrigeration is equal to 12,000 BTU/hr. Therefore, the correct answer is:

**C. 12,000 BTU/Hr

TRUE

Damper authority refers to the ability of a damper to control the flow of air in a system. In an air handler, the damper authority can influence the volume of mixed air flow by regulating the amount of outside air mixed with return air. Properly adjusted dampers can help maintain desired airflow rates and improve system efficiency.

Comfort problems will likely be experienced if zone temperature sensors are mounted in the following locations:

A. In direct sunlight
B. On an exterior wall
C. Behind an obstruction such as a door or bookcase

These locations can lead to inaccurate temperature readings, which can affect the heating and cooling system's performance and overall comfort in the space.

D. On an interior wall away from heat gains is generally a better location for a temperature sensor, as it is less likely

TRUE

The secondary pump in a chilled water system is indeed used to maintain a minimum flow through the chiller. This is important to ensure that the chiller operates efficiently and safely, preventing issues such as overheating or damage due to insufficient flow.

The two temperature measuring devices that use two different metals to measure temperature are:

1. Bi Metallic Thermometers - These devices use two different metals that expand at different rates when heated, causing the bimetallic strip to bend and indicate the temperature.

2. Thermocouples - These devices consist of two different metals joined at one end. When the junction is heated or cooled, it produces a voltage that can be correlated to temperature.

The other options, Resistive Temperature Detectors (RTDs) and Thermistors, use changes in resistance of a single material to measure temperature, rather than two different metals.

C. Either can be placed on the inlet of a coil.

Both mixing and diverting valves can be used on the supply water side of a coil, depending on the specific application and system design

The correct answer is D. State Point.

In psychrometrics, a state point is a specific condition of air defined by its dry bulb temperature, wet bulb temperature, relative humidity, and other properties. It represents the intersection of the dry bulb and wet bulb readings on the psychometric chart.

The potential energy within an air system is known as:

D. Static Pressure

Static pressure is the pressure exerted by a fluid at rest, and it represents the potential energy of the air in the system.

To solve the problem, we first need to identify the two different ages for which drivers have the same number of accidents based on the graph of the function ( f(x) = 0.4x^2 - 36x + 950 ).

From the description of the graph, we see that the function has the same value at two different ages: ( x = 26 ) and ( x = 64 ). Therefore, the correct answer for Part 1 is:

A. ( x = 26, x = 64 )

Next, we need to find the number of accidents for drivers at each of these ages using the function ( f(x) ).

1. Calculate ( f(26) ): [ f(26) = 0.4(26^2) - 36(26) + 950 ] [ = 0.4(676) - 936 + 950 ] [ = 270.4 - 936 + 950 ] [ = 270.4 + 14 ] [ = 284.4 ]

2. Calculate ( f(64) ): [ f(64) = 0.4(64^2) - 36(64) + 950 ] [ = 0.4(4096) - 2304 + 950 ] [ = 1638.4 - 2304 + 950 ] [ = 1638.4 - 1354 ] [ = 284.4 ]

Both calculations yield approximately ( 284.4 ). Rounding to the nearest whole number gives us:

284 accidents for both ages ( x = 26 ) and ( x = 64 ).

Thus, the answer for Part 2 is:

284 (rounded to the nearest whole number as needed).

False.

The burden of a tax typically rests more heavily on the party that has less ability to "escape" the tax, meaning that the party with less elasticity in their demand or supply will bear a greater burden. In other words, if one party can more easily adjust their behavior to avoid the tax (for example, by changing their consumption or production levels), they will bear a smaller share of the

True.

The burden of a tax often falls more heavily on the party that has less ability to avoid or "escape" the tax. This is typically the party that cannot easily change their behavior or find alternatives to mitigate the tax's impact. For example, consumers may bear the burden of a sales tax if they cannot easily switch to untaxed goods, while producers may bear the burden of a corporate tax if they cannot pass the cost onto consumers.

True

In a market with a downward-sloping demand curve and an upward-sloping supply curve, when a tax is placed on sellers, it typically results in sellers receiving a lower price (after accounting for the tax) and buyers paying a higher price. The tax creates a wedge between the price buyers pay and the price sellers receive, leading to a decrease in the effective price for sellers and an increase in the price for buyers.

True

When a tax is imposed, it typically leads to a decrease in both consumer surplus and producer surplus. Consumer surplus decreases because consumers pay a higher price for the good or service due to the tax, while producer surplus decreases because producers receive a lower effective price after the tax is deducted. Overall, the imposition of a tax creates a deadweight loss in the market, reducing the total welfare.