Elements_05

50問 • 10ヶ月前

Jacky Shane Luyas Buhia

通報

問題一覧

Specific heat capacity is an SI derived unit described as:

D. J/kg °K

A device whose primary function is to meter the flow of refrigerant to the evaporator.

C. Thermostatic expansion valve

The internal combustion engines never work in

A. Rankine cycle

The general chemical formula for all hydrocarbons is CnHm. In different combinations of interest, as internal combustion engine fuel, n varies from:

A. 1 to 26

The general chemical formula for all hydrocarbons is CnHm. In different combinations of interest, as internal combustion engine fuel m varies from:

B. 2 to 54

The general chemical formula of a paraffin fuel is:

C. CnH2n+2

Morse test is conducted on:

B. Multi-cylinder engines

Prony brake is used for testing of:

A. Small engines

At atmospheric condition, hydrocarbon molecules with a low number of carbon atoms, 1 to 4 are

C. Gases

Hydrocarbons with 5 to 15 carbon atoms are:

A. More or less volatile light oils

In a hot wire anemometer the rate of heat loss from sensing element is a function of:

C. Velocity of flow

In a four stroke engine if a valve opens 25 before B.D.C. and close 10 after T.D.C the valve should be:

B. Exhaust valve

Sticking valves

B. Valve springs of defective material

Detonation of pinging noise is due to :

B. Late timing of fuel injection

The thermal efficiency of a dual cycle engine with fixed compression ratio and fixed quantity of heat and with increase in pressure ratio, will

A. Increase

During idling in compression ignition engine the air fuel ratio may be of the order of:

A. 30

Vapor lock is

C. Complete or partial stoppage of fuel supply because of vaporization of fuel in supply steam

The mean effective pressure of a diesel cycle having fixed compression ratio will increase if cut off ratio is:

A. Increased

Hot spots

C. Are the spots where heavier functions of fuel are vaporized

Clog point of an oil refer to:

D. the temperature at which paraffin ad waxes in oil start precipitating

Otto cycle consists of

A. two isentropic and two constant volumes processes

For balancing single cylinder engine a counter weight is added to:

D. Crank

The king pin inclination is generally:

C. Between 2 and 5

Which is not correct for calculating air standard efficiency?

D. Gases dissociate at higher temperature

Diesel cycle consists of:

C. two isentropic, one constant volume and one constant pressure processes

When air contains all of the water vapor it can hold, it is said to be ________.

B. Saturated

What is the instrument used to register relative humidity?

A. Hygrometer

Humidity is a measure of which of the following?

A. Water vapor content

In an air conditioning system, before the air is circulated to the required area, it is:

D. All of the above

The temperature at which water vapor in the atmosphere begins to condense is known as the:

C. Dew point

Saturation temperature is the same as;

A. Dew point

The mass of water vapor per unit volume of air ______________.

A. Absolute humidity

It is used to deliver concentrated airstreams into a room. Many have one-way or two- way adjustable air stream deflectors.

A. Register

It is used to control the air-throw distance, height, and spread, as well as the amount of air.

A. Grille

It is used to deliver widespread, fan-shaped flows of air into the room.

B. Diffuser

Which of the following fans in air conditioning systems which can be classified as centrifugal flow?

C. Propeller fan

The most common controller in the heating and cooling systems.

A. Thermostat

The temperature at which water vapor in the atmosphere begins to condense is known as the:

C. Dew point

When the bypass factor is B, the coil efficiency for sensible cooling of air is equal to:

C. 1 – B

The psychrometric chart in air conditioning determines the _______________.

D. Moist air conditions

What is the value of air stratification in air conditioning design fit for human comfort?

C. Less than air temperature

Which of the following statement is correct? The relative humidity of an air water vapor mixture ______________.

D. Is the ratio of the partial pressure of water vapor to the saturation pressure at the mixture temperature

What is the lowest temperature to which water could possibly be cooled in a cooling tower?

B. The temperature of adiabatic compression

Combined process of cooling and humidifying is also known as:

C. Evaporative cooling process

In a cooling tower, the water is cooled mainly by _________.

C. Evaporation

Which of the following types of air dryers works by absorbing moisture on a solid dessicant or drying material such as activated alumina, silicon gel or molecular sieve?

A. Regenerative dryer

The relationship of water vapor in the air at the dew point temperature to the amount that would be in the air if the air were saturated at the dry bulb temperature is:

C. Relative humidity

Which of the following devices is used for measuring the absolute pressure of the atmosphere?

C. Barometer

Kinematic viscosity can be expressed in which of the following units?

A. 𝑚³/𝑠

Which of the following does not affect the rise and fall of liquid in a small-diameter capiliary tube?

D. Viscosity of liquid

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問題一覧

Specific heat capacity is an SI derived unit described as:

D. J/kg °K

A device whose primary function is to meter the flow of refrigerant to the evaporator.

C. Thermostatic expansion valve

The internal combustion engines never work in

A. Rankine cycle

The general chemical formula for all hydrocarbons is CnHm. In different combinations of interest, as internal combustion engine fuel, n varies from:

A. 1 to 26

The general chemical formula for all hydrocarbons is CnHm. In different combinations of interest, as internal combustion engine fuel m varies from:

B. 2 to 54

The general chemical formula of a paraffin fuel is:

C. CnH2n+2

Morse test is conducted on:

B. Multi-cylinder engines

Prony brake is used for testing of:

A. Small engines

At atmospheric condition, hydrocarbon molecules with a low number of carbon atoms, 1 to 4 are

C. Gases

Hydrocarbons with 5 to 15 carbon atoms are:

A. More or less volatile light oils

In a hot wire anemometer the rate of heat loss from sensing element is a function of:

C. Velocity of flow

In a four stroke engine if a valve opens 25 before B.D.C. and close 10 after T.D.C the valve should be:

B. Exhaust valve

Sticking valves

B. Valve springs of defective material

Detonation of pinging noise is due to :

B. Late timing of fuel injection

The thermal efficiency of a dual cycle engine with fixed compression ratio and fixed quantity of heat and with increase in pressure ratio, will

A. Increase

During idling in compression ignition engine the air fuel ratio may be of the order of:

A. 30

Vapor lock is

C. Complete or partial stoppage of fuel supply because of vaporization of fuel in supply steam

The mean effective pressure of a diesel cycle having fixed compression ratio will increase if cut off ratio is:

A. Increased

Hot spots

C. Are the spots where heavier functions of fuel are vaporized

Clog point of an oil refer to:

D. the temperature at which paraffin ad waxes in oil start precipitating

Otto cycle consists of

A. two isentropic and two constant volumes processes

For balancing single cylinder engine a counter weight is added to:

D. Crank

The king pin inclination is generally:

C. Between 2 and 5

Which is not correct for calculating air standard efficiency?

D. Gases dissociate at higher temperature

Diesel cycle consists of:

C. two isentropic, one constant volume and one constant pressure processes

When air contains all of the water vapor it can hold, it is said to be ________.

B. Saturated

What is the instrument used to register relative humidity?

A. Hygrometer

Humidity is a measure of which of the following?

A. Water vapor content

In an air conditioning system, before the air is circulated to the required area, it is:

D. All of the above

The temperature at which water vapor in the atmosphere begins to condense is known as the:

C. Dew point

Saturation temperature is the same as;

A. Dew point

The mass of water vapor per unit volume of air ______________.

A. Absolute humidity

It is used to deliver concentrated airstreams into a room. Many have one-way or two- way adjustable air stream deflectors.

A. Register

It is used to control the air-throw distance, height, and spread, as well as the amount of air.

A. Grille

It is used to deliver widespread, fan-shaped flows of air into the room.

B. Diffuser

Which of the following fans in air conditioning systems which can be classified as centrifugal flow?

C. Propeller fan

The most common controller in the heating and cooling systems.

A. Thermostat

The temperature at which water vapor in the atmosphere begins to condense is known as the:

C. Dew point

When the bypass factor is B, the coil efficiency for sensible cooling of air is equal to:

C. 1 – B

The psychrometric chart in air conditioning determines the _______________.

D. Moist air conditions

What is the value of air stratification in air conditioning design fit for human comfort?

C. Less than air temperature

Which of the following statement is correct? The relative humidity of an air water vapor mixture ______________.

D. Is the ratio of the partial pressure of water vapor to the saturation pressure at the mixture temperature

What is the lowest temperature to which water could possibly be cooled in a cooling tower?

B. The temperature of adiabatic compression

Combined process of cooling and humidifying is also known as:

C. Evaporative cooling process

In a cooling tower, the water is cooled mainly by _________.

C. Evaporation

Which of the following types of air dryers works by absorbing moisture on a solid dessicant or drying material such as activated alumina, silicon gel or molecular sieve?

A. Regenerative dryer

The relationship of water vapor in the air at the dew point temperature to the amount that would be in the air if the air were saturated at the dry bulb temperature is:

C. Relative humidity

Which of the following devices is used for measuring the absolute pressure of the atmosphere?

C. Barometer

Kinematic viscosity can be expressed in which of the following units?

A. 𝑚³/𝑠

Which of the following does not affect the rise and fall of liquid in a small-diameter capiliary tube?

D. Viscosity of liquid