VIT-02 PIPE FULL

b. 815°C and 1093°C

High temperature coke is made from coal at temperature ranging from

a. 704°C and 815°C
b. 815°C and 1093°C
c. 1037°C and 1293°C
d. 1293°C to 1500°C

d. 704°C

Low temperature coke is formed at temperature below

a. 1037°C
b. 1093°C
c. 815 °C
d. 704°C

d. 1%

For wet base domestic heating boilers and forced warm air furnaces, stainless steel combustion chambers are used extensively. Type 430 stainless steel is representative of the lowest grade material that maybe used which has chromium content of

a. 10%
b. 11%
c. 18%
d. 1%

b. 275 - 700 °F

Lubricating coils have flash points from

a. 300 - 800 °F
b. 275 - 700 °F
c. 400 - 900 °F
d. 200 - 700 °F

b. 1,830 mm

In air-conditioning and ventilation standards, as the air enters into the living zone, the distance above the floor is

a. 1,380 mm
b. 1,830 mm
c. 3,180 mm
d. 3,810 mm

a. 1000 ppm

Carbon Dioxide concentration is air when measured 910 mm above the floor shall not exceed

a. 1000 ppm
b. 2000 ppm
c. 1500 ppm
d. 500 ppm

d. Effective temperature

An empirically determined index, which combines into a single value the effect of temperature, humidity and air movement on the sensation of warmth or cold felt by the human body.

a. Dry bulb temperature
b. Wet bulb temperature
c. Dewpoint temperature
d. Effective temperature

a. Unit systems each containing of more than 4.55 kg of group refrigerant

No refrigerating system shall be installed in any room except

a. Unit systems each containing of more than 4.55 kg of group refrigerant
b. Unit system containing not less than 4.55 kg of group refrigerant
c. Unit systems each containing not more than 4.55 kg of group 2 refrigerant
d. Unit systems each containing not less than 4.55 of group 2 refrigererant

b. Gasoline

A refinement petroleum naphta which by its composition is suitable for use as a carburetant in internal combustion engine

a. viscosity
b. Gasoline
c. Alcohol
d. Diesel

a. Kerosene

A petroleum distillate having a flashpoint not below 22.8°C

a. Kerosene
b. Gasoline
c. Alcohol
d. Diesel

a. lower than the density of the vapor in the suction line

The density of vapor filling the cylinder is

a. lower than the density of the vapor in the suction line
b. Equal to the density of the vapor in the suction line
c. greater than the density of the vapor in the suction line
d. proportional to the density of the vapor in the suction line

c. automatic controls not functioning properly

If the temperature in the icebox is too high, the trouble could be

a. a clogged scale trap
b. air in the system
c. automatic controls not functioning properly
d. insufficient cooling water to the condenser

a. 10 to 12 F

Natural draft towers can cool the water to within \_______ of the wet bulb temperature.

a. 10 to 12 F
b. 5 to 6 F
c. 20 to 24 F
d. 2.5 to 3 F

a. closed except when checking oil level

In an ammonia system, the oil gage must be kept:

a. closed except when checking oil level
b. open at all times
c. closed when machines is shut down
d. open when machine is shut down

a. It is difficult to condense the refrigerant if the circulating water temperature is too high

One disadvantage of a CO2 system is the fact that:

a. It is difficult to condense the refrigerant if the circulating water temperature is too high
b. It is difficult to condense the refrigerant if the circulating water temperature is to low
c. due to high pressure it is difficult to keep oil from mixing with refrigerant
d. it takes more refrigerant to keep the icebox cold

d. too much oil in the system

(Too much oil \= Too much Cooling)

Sweating of the crankcase is caused by:

a. too much superheat
b. insufficient superheat
c. expansion valve hung up
d. too much oil in the system

c. will measure, by its change, the quantity of heat added when refrigerant is vaporized at constant pressure.

the term enthalpy

a. is only used for the properties of refrigerant vapor.
b. is considered by Gibb\`s Rule.
c. will measure, by its change, the quantity of heat added when refrigerant is vaporized at constant pressure.
d. defines the gas equation

d. the absolute humidity remains constant

When heat is added to the moist air in an air - conditioning process

a. the wet-bulb temperature decreases.
b. the water vapor pressure increases.
c. the relative humidity increases
d. the absolute humidity remains constant

d. its absolute humidity remains constant.

(Note: A is correct but D is the answer)

Air having a relative humidity of 50% is heated in an air conditioning apparatus. After having it will be found that

a. its relative humidity will be lower than 50%
b. its relative humidity will be higher than 50%
c. its vapor pressure will decrease.
d. its absolute humidity remains constant.

d. 12,000 BTU/hr

The tons of refrigeration is a heat unit equivalent to

a. 3,413 BTU/hr
b. 990 BTU/hr
c. 2,545 BTU/hr
d. 12,000 BTU/hr

d. the absolute or specific humidity remains constant

In the process of heating atmospheric air in an air conditioning apparatus

a. the relative humidity increases
b. the relative humidity remains constant
c. the water vapor pressure decreases.
d. the absolute or specific humidity remains constant

c. Dew - point temperature

The temperature at which the vapor in mixture is cooled at constant pressure is called

a. Dry - bulb temperature
b. Wet - bulb temperature
c. Dew - point temperature
d. Relative humidity

b. coil by - pass factor

Refers to the amount of air that has not been in contact, during the sensible cooling process, with the surface of the cooler coil

a. coil efficiency
b. coil by - pass factor
c. coil contact factor
d. none of these

a. Metabolism

The process that the body uses to convert energy in food to heat and work, or the process that determines the rate at which energy is converted from chemical to thermal form within the body

a. Metabolism
b. Body food processing
c. Eating
d. Blood circulation

b. clothing

It is a body insulation that is usually described as a single equivalent uniform layer over the whole body.

a. skin
b. clothing
c. blood
d. water

c. Mean radiant temperature

Mean radiant temperature is the basic index used to describe the radiant conditions in a space, it is the mean temperature of individual exposed surfaces in the environment.

a. index temperature
b. Space temperature
c. Mean radiant temperature
d. Dry - bulb temperature

c. Vernon\`s Globe thermometer

(Sphere \= Glope)

It is the most common in instrument used to determine the main radiant temperature. It consist of a hollow sphere 6 inches in diameter, flat black paint coating, and a thermocouple or thermometer bulb at its center.

a. Psychrometer
b. Mercury thermometer
c. Vernon\`s Globe thermometer
d. Kelvin\`s thermometer

C. Thermal conduction

It is the mechanism of heat transfer between parts of a continuum because of transfer of energy between particles or groups of particles at the atomic level. It is the mode of heat transmission through the building structure, like the wall, due to the temperature difference between surfaces of the wall.

A. Heat transmission
B. Solar radiation
C. Thermal conduction
D. Thermal convection

D. Thermal convection

It is the transport of energy by mixing in addition to conduction. It is associated with fluids in motion, generally through a pipe or duct or along a surface.

A. Heat transmission
B. Solar radiation
C. Thermal conduction
D. Thermal convection

C. Forced convection

A form of thermal convection when the bulk of the fluid is moving relative to the heat transfer surface because such motion is usually caused by a blower, fan, or pump that is forcing the flow.

A. Slow convection
B. Free convection
C. Forced convection
D. Thermal convection

B. Free convection

A form of thermal convection when the motion of the fluid is due entirely to buoyancy forces, usually confined to a layer near the heated or cooled surface.

A. Slow convection
B. Free convection
C. Forced convection
D. Thermal convection

C. Thermal conduction

(Radiation ang actual pero Conduction ang answer)

A mode of heat transfer by electromagnetic waves, an entirely different phenomenon from conduction and convection; it can occur in a perfect vacuum and is usually impeded by an intervening medium

A. Thermal radiation
B. Solar radiation
C. Thermal conduction
D. Thermal convection

A. Air condition room

An enveloped area with significantly higher rate of heat transfer than the contagious enclosure is called:

A. Air condition room
B. Thermal bridge
C. Global irradiation
D. Fenestration

C. Total or global irradiation

It is the total thermal radiation that impinges on a surface from all directions and from all sources.
A. Adsorption
B. Thermal bridge
C. Total or global irradiation
D. Transmission

b. Radiation

(Note: Absorption is correct but Radiation and answer)

The transformation of the radiant energy into thermal energy stored by the molecules is known as

a. absorption
b. Radiation
c. Transmission
d. reflection

d. reflection

It is the return of radiation by a surface without change of frequency; the radiation is "bounced" off of the surface

a. absorption
b. Radiation
c. Transmission
d. reflection

A. equals the increase in enthalpy.

In a refrigeration system, the heat absorbed in the evaporator per kg refrigerant passing through

A. equals the increase in enthalpy.
B. equals the increase in volume
C. does not depend on the refrigerant used
D. is decreased if pre-cooler is used.

B. Transmission

It is the passage of radiation through a medium without change of frequency.

A. Absorption
B. Transmission
C. Fenestation
D. Reflection

C. Fenestation

It refers to any glazed aperture in a building envelope, the components of which include: glazing material, either glass or plastic; framing, mullions, muntins, and dividers; external shading devicesl and integral shading systems (between glass).

A. Absorption
B. Transmission
C. Fenestation
D. Radiation

C. Heat gain

The rate at which energy is transferred to or generated within a space is called:
A. Heat transmission
B. Heat conduction
C. Heat gain
D. Sensible heat convection

D. Cooling load

It is the rate at which energy must be removed from a space to maintain the temperature and humidity at the design values.
A. Heating load
B. Heat conduction
C. Heat gain
D. Cooling load

B. Heat extraction rate

It is the rate at which energy is removed from a space by cooling and dehumidifying equipment. This rate must be equal to the cooling load when the space conditions are constant and the equipment is operating.

A. Heat transmission rate
B. Heat extraction rate
C. Heat gain rate
D. Heat conduction rate

B. Bin method

It is a computer or hand calculation procedure where energy requirements are determined at many outdoor temperature conditions. It is used for the energy calculations of air conditioning systems.

A. Vernon method
B. Bin method
C. Kelvin method
D. Dalton method

A. Humid operative temperature

It is the temperature of a uniform environment at 100% relative humidity in which a person or occupant loses the same total amount of heat from the skin as in the actual environment.

A. Humid operative temperature
B. Mean temperature
C. Mean radiant temperature
D. All of these

d. Tower Dryer

A type of dryer that consist of a vertical shaft in which the wet feed is introduced at the top and falls downward over baffles while coming in contact with the hot air that rises and exhaust at the top. This type of dryer is used for drying palay, wheat and grains

a. Rotary dryer
b. Hearth Dryer
c. Tray Dryer
d. Tower Dryer

b. Dew Point

The temperature to which the air must be cooled at constant pressure to produce saturation is called:

a. Boiling point
b. Dew Point
c. Critical Point
d. triple point

A. Absolute humidity

The mass of water vapor per unit volume of air

A. Absolute humidity
B. specific humidity
c. Relative humidity
d. Critical humidity

c. adiabatic

When the expansion of compression of gas takes place without transfer of heat to or from the gas, the process is called:

a. Isothermal
b. Isentropic
c. adiabatic
d. Reversible

c. Weight density

Weight per unit volume is termed as:

a. Specific gravity
b. Density
c. Weight density
d. Pressure

d. Affects the distribution of air

The design of an air supply duct of an air conditioning system

a. Adds moisture to the air
b. Lowers the temperature of the air
c. Does not affect the distribution of air
d. Affects the distribution of air

c. 14.7 psi

Atmospheric pressure at sea level is:

a. 76 mm Hg
b. 29 ft H2O
c. 14.7 psi
d. 101.325 kg/cm2

a. 23% O2

Air contains by weight:

a. 23% O2
b. 21% O2
c. 22% O2
d. 20% O2

d. Hydrometer

An instrument used to determine the specific gravity of a solution

a. Tachometer
b. Sling psychrometer
c. Hygrometer
d. Hydrometer

b. latent heat

The type of heat that changes the physical state of a substance

a. specific heat
b. latent heat
c. sensible heat
d. over heat.

d. absolute zero

Refers to the temperature at which all molecular motion ceases according to the kinetic theory of heat.

a. flash point
b. critical point
c. saturation point
d. absolute zero

d. Subcooled

is one whose temperature is below the saturated temperature of one gram of water to one degree centigrade.

a. compressed
b. superheated
c. condensed
d. Subcooled

b. temperature

Measure of hotness or coldness of the body

a. pressure
b. temperature
c. energy
d. Entropy

c. Dew point

The temperature at which the water vapor in the air begins to condensed, or the temperature at which the relative humidity of air become 100%.

a. Flash point
b. Boiling Point
c. Dew point
d. Freezing point

d. sling psychrometer

It consists of a wet and dry bulb thermometer mounted on a strip of metal

a. Manometer
b. gyrometer
c. pyrometer
d. sling psychrometer

a. Air pressure

A manometer is an instrument that is used to measure:

a. Air pressure
b. Condensate water level
c. Heat radiation
d. air volume

a. partial pressure actual dew point

The relationship of water vapor in the air at the dewpoint temperature to the amount that should be in the air if the air were saturated at the dry-bulb temperature is:

a. partial pressure actual dew point
b. relative humidity
c. percentage humidity
d. run faster

c. wet bulb temperature lies numerically between dewpoint and dry bulb temperature for unsaturated systems

all of the following statements about wet bulb temperature are true, except

a. Wet bulb temperature equals adiabatic saturation temperature
b. wet bulb temperature is the only temperature necessary to determine grains water per lb of dry air.
c. wet bulb temperature lies numerically between dewpoint and dry bulb temperature for unsaturated systems
d. wet bulb temperature equals both dry-bulb and dew point temperature at 100% relative humidity.

c. The same

In a sensible heating process, the final humidity ratio is:

a. Increased
b. Decreased
c. The same
d. Cannot be determined

a. Increased

in the adiabatic saturation process, the final relative humidity is:

a. Increased
b. Decreased
c. The same
d. Cannot be determined

a. Summer air conditioning

Cooling and dehumidifying process is commonly used for:

a. Summer air conditioning
b. Ice making
c. Winter Cooling
d. Heating pump

a. Constant WB temperature process

An adiabatic saturation process is also known as:

a. Constant WB temperature process
b. Constant DB temperature process
c. Constant DP temperature process
d. Constant Vapor pressure process

d. Chemical dehumidifying

The process of simultaneous heating and dehumidifying is known as:

a. Sensible heating
b. Sensible cooling
c. Cooling and dehumidifying
d. Chemical dehumidifying

a. Sensible heating

The process of increasing the dry-bulb temperature without changing the humidity ratio is know as:

a. Sensible heating
b. Sensible cooling
c. Cooling and dehumidifying
d. Heating and dehumidifying

c. Cooling and dehumidifying

The process of simultaneos cooling and decreasing of humidity ratio is known as:

a. Sensible heating
b. Cooling and dehumidifying
c. Cooling and dehumidifying
d. Heating and dehumidifying

b. Sensible cooling

The process of cooling without changing the humidity ratio is known as:

a. Sensible heating
b. Sensible cooling
c. Cooling and dehumidifying
d. Heating and dehumidifying

b. Heating and humidifying

The process of simultaneous heating and humidifying is known as:

a. Sensible cooling
b. Heating and humidifying
c. Cooling and humidifying
d. Heating and Dehumidifying

b. Refrigeration

The process of cooling and maintaining the temperature of space or material below its surrounding temperature.

a. Air conditioning
b. Refrigeration
c. Comfort air conditioning
d. All of the above

a. Air conditioning

The process of treating air so as to control simultaneously Its temperature, humidity, cleanliness, and distribution to meet the requirement of conditioned space.

a. Air conditioning
b. Refrigeration
c. Adiabatic saturation
d. None of the above

b. dehumidifier

An appliance used to dehumidify air in homes and buildings which uses refrigerant unit.

a. Air conditioner
b. dehumidifier
c. humidifier
d. all of the above

c. Compressor

A component of vapor-compression refrigeration system which is used to compressed refrigerant vapor from evaporator to the condenser.

a. Expansion valve
b. Evaporator
c. Compressor
d. Condenser

b. Condenser

One of the components at the high-pressure side of vapor-compression refrigeration system.

a. Cooling tower
b. Condenser
c. Evaporator
d. All of the above

b. temperature

The thermal state of a body considered with reference to its ability to communicate heat to other bodies.

a. Internal energy
b. temperature
c. Heat energy
d. Non of the above

c. Heat energy

A form of energy that flows from higher temperature body to lower temperature body.

a. Internal energy
b. Specific Heat
c. Heat energy
d. Kinetic energy

c. Entropy

A thermodynamic quantity that measures the fraction of the total energy of a system that is not available for doing work.

a. Internal energy
b. Specific heat
c. Entropy
d. Enthalpy

c. Amagat\`s Law

The total volume of a mixture of gases is equal to the sum of the volumes that would be occupied by the various components each at the pressure and temperature of the mixture.

a. Dalton\`s Law of partial pressure
b. Avogadro\`s Law
c. Amagat\`s Law
d. Charles\`s Law

c. Dalton\`s law of partial pressure

The total pressure of a mixture of gasses is the sum of the pressure that each gas would exert were it to occupy the vessel alone at the volume and temperature of the mixture

a. Amagat\`s law
b. Avogadro\`s law
c. Dalton\`s law of partial pressure
d. None of the above

a. Humidity ratio

The ratio of the actual partial pressure of vapor and the saturation pressure of vapor corresponding to the actual temperature of the mixture.

a. Humidity ratio
b. Specific humidity
c. Relative humidity
d. All of the above

c. Adiabatic saturation process

A steady - flow process at total pressure through a control volume for which there is not heat, and in which a liquid and the gas flowing through arrive at a local equilibrium state containing saturated vapor before the exit section is reached.

a. Sensible cooling process
b. Sensible Heating process
c. Adiabatic saturation process
d. all of the above

d. Psychrometer

An instrument of two thermometer, one used to measure the dry - bulb temperature and the other one used to measure wet - bulb temperature of air.

a. Hydrometer
b. Barometer
c. Thermometer
d. Psychrometer

a. Dry - bulb temperature

The actual temperature of air which is measured by an ordinary thermometer, or the temperature of a gas or mixture of gasses indicated by an accurate thermometer after correction for radiation.

a. Dry - bulb temperature
b. Dew - point temperature
c. Wet - bulb temperature
d. All of the above

d. all of the above

The ratio of the mass of water vapor and the mass of dry air in the mixture

a. Humidity ratio
b. Mixing ratio
c. Specific humidity
d. all of the above

c. Enthalpy

The sum of the internal energy and the product of pressure and specific volume.

a. Entropy
b. Internal energy
c. Enthalpy
d. None of the above

b. Dew - point temperature

The temperature at which condensation of water vapor in space begin

a. Dry - bulb temperature
b. Dew - point temperature
c. Wet - bulb temperature
d. All of the above

b. Dew - point temperature

The temperature of a moist air which is equal to the saturation temperature of the partial pressure of the vapor.

a. Dry - bulb temperature
b. Dew - point temperature
c. Wet - bulb temperature
d. All of the above

c. Boyle\`s Law

At constant temperature, the absolute pressure of a gas varies inversely as its volume.

a. Amagat\`s Law
b. Charles\`s Law
c. Boyle\`s Law
d. None of the above

b. Charles\`s Law

At Constant pressure, the volume of gas is proportional to its absolute temperature; at constant volume, the pressure is proportional to its absolute temperature.

a. Amagat\`s Law
b. Charles\`s Law
c. Boyle\`s Law
d. Avogadro\`s Law

b. Evaporator

A part of refrigerating unit in which refrigerant vaporizes to absorb heat

a. Expansion valve
b. Evaporator
c. Compressor
d. Condenser

d. Condenser

A part of refrigerating unit in which refrigerant undergoes transformation from gas to liquid.

a. Expansion valve
b. Evaporator
c. Compressor
d. Condenser

b. The air is saturated

If the dry and wet - bulb temperature readings of the sling psychrometer are identical.

a. The thermometer are in error
b. The air is saturated
c. The relative humidity is zero percent
d. the air is completely dry

a. Increased

In an adiabatic saturation process, the relative humidity is

a. Increased
b. Reduced to zero
c. Decreased
d. None of the above

b. Dew - point temperature

The temperature at which the water vapor in the air begins to condense, or the temperature at which the relative humidity of air becomes 100%.

a. Dry - bulb temperature
b. Dew - point temperature
c. Wet - bulb temperature
d. All of the above

a. Zero absolute temperature

Refers to the temperature at which a molecular motion ceases, according to the kinetic theory of heat.

a. Zero absolute temperature
b. Absolute temperature
c. Freezing temperature
d. Boling temperature

a. Transmission

Heat gain or heat loss due to a temperature difference across a building element

a. Transmission
b. Infiltration
c. Solar
d. All of the above

c. Solar

Heat gain due to transmission of solar energy through a transparent building component or absorption by an opaque building component.

a. Transmission
b. Infiltration
c. Solar
d. None of the above

b. Air

A mixture of oxygen and nitrogen, plus small amounts of rare gases, such as argon, is known as.

a. Steam
b. Air
c. Argon
d. All of the above