What is the temperature measured by a thermometer with water-saturated wick?

Wet-bulb temperature

True or False: During sensible heating, humidity ratio remains constant.

True

Fill in the blank: One ton of refrigeration equals _____ Btu/hr.

12,000

Which psychrometric process follows constant wet-bulb temperature?
A) Sensible heating
B) Evaporative cooling
C) Dehumidification
D) Mixing

B) Evaporative cooling

What formula calculates conduction heat transfer through building envelope?

Q = U × A × ΔT

At what temperature does water vapor condense at constant pressure?

Dew point temperature

True or False: Relative humidity equals actual vapor pressure divided by saturation pressure.

True

Fill in the blank: Standard air density is _____ lb/ft³ at 70°F.

0.075

Which component increases refrigerant pressure and temperature?
A) Evaporator
B) Condenser
C) Compressor
D) Expansion valve

C) Compressor

What happens to dry-bulb temperature during cooling and dehumidification?

Decreases below dew point

How many grains equal one pound of water vapor?

7,000 grains

True or False: Expansion process in refrigeration cycle is isenthalpic.

True

Fill in the blank: Supply air quantity formula is CFM = Qs/(1.08 × _____)

ΔT

What type of heat exchanger recovers both sensible and latent heat?

Rotary wheel (enthalpy wheel)

Why does economizer use outdoor air for cooling?

When outdoor temperature is below return air temperature

Which refrigeration cycle component absorbs heat from cooled space?
A) Compressor
B) Condenser
C) Evaporator
D) Expansion valve

C) Evaporator

What is sensible heat ratio formula?

SHR = Qs/(Qs + Ql)

True or False: Chilled water systems typically operate with 10-12°F temperature difference.

True

Fill in the blank: Latent heat from ventilation is Ql = 0.68 × CFM × _____

ΔW

What determines cooling coil condition line slope on psychrometric chart?

Sensible heat ratio (SHR)

How do you calculate coefficient of performance for refrigeration?

COP = QL/Wcomp

True or False: Mixing airstreams results in properties on straight line between states.

True

Which duct design method maintains constant pressure loss per length?
A) Equal friction
B) Velocity method
C) Static regain
D) Pressure drop

A) Equal friction

What is typical supply air temperature rise below room temperature?

15-25°F for cooling

Fill in the blank: Cooling tower range is temperature difference between _____ water temperatures.

Entering and leaving

Why must outdoor air requirements include both people and area rates?

ASHRAE Standard 62.1 specifies both components for adequate ventilation

What conversion factor relates electrical power to heat gain?

3.41 Btu/hr per watt

True or False: Infiltration sensible load uses formula Qs = 1.08 × CFM × ΔT.

True

Which effectiveness type measures moisture recovery in energy recovery devices?
A) Sensible
B) Latent
C) Total
D) Thermal

B) Latent

What refrigerant property remains constant during expansion valve process?

Enthalpy (isenthalpic expansion)

How does solar heat gain coefficient (SHGC) replace older methods?

SHGC replaces shading coefficient (SC) in modern calculations

Fill in the blank: Hot water heating systems typically operate at _____ °F supply temperature.

180-200

What determines required supply airflow for dehumidification applications?

Both sensible and latent load requirements must be satisfied

True or False: Cooling tower approach cannot be less than zero.

True

What psychrometric process occurs when air temperature decreases at constant humidity ratio?

Sensible cooling (above dew point)