Which is NOT a characteristic of emissivity?  A. It is high with most nonmetals  B. It is directly proportional to temperature  C. It is independent with the surface condition of the material  D. It is low with highly polished metals

Which is NOT a characteristic of emissivity?  A. It is high with most nonmetals  B. It is directly proportional to temperature  C. It is independent with the surface condition of the material  D. It is low with highly polished metals
by

1 Answer

Answer :

It is independent with the surface condition of the material
by

Related questions

The volume of a confined gas is held constant, the pressure is directly proportional to the absolute temperature.  a. Charle’s Law  b. Boyle’s Law  c. Joule’s Law  d. Specific Heat

Description : The volume of a confined gas is held constant, the pressure is directly proportional to the absolute temperature.  a. Charle’s Law  b. Boyle’s Law  c. Joule’s Law  d. Specific Heat

Last Answer : Boyle’s Law

The pressure of the confined gas is held constant, the volume directly proportional to the absolute temperature.  a. Charle’s Law  b. Boyle’s Law  c. Zeroth Law  d. Gas Law

Description : The pressure of the confined gas is held constant, the volume directly proportional to the absolute temperature.  a. Charle’s Law  b. Boyle’s Law  c. Zeroth Law  d. Gas Law

Last Answer : Charle’s Law

The volume of an ideal gas is directly proportional to its  a. pressure  b. Celsius temperature  c. Kelvin temperature  d. Fahrenheit temperature

Description : The volume of an ideal gas is directly proportional to its  a. pressure  b. Celsius temperature  c. Kelvin temperature  d. Fahrenheit temperature

Last Answer : Kelvin temperature

According to Avogadro’s law, the density of any two gases is __________ their molecular masses, if the gases are at the same temperature and pressure.  A. equal to  B. directly proportional to  C. inversely proportional to

Description : According to Avogadro’s law, the density of any two gases is __________ their molecular masses, if the gases are at the same temperature and pressure.  A. equal to  B. directly proportional to  C. inversely proportional to

Last Answer : Answer: B

Pick out the wrong statement. (A) The emissivity of a surface decreases, if it gets corroded by atmospheric environment (B) The emissivity of a surface increases with increase in surface roughness (C) The emissivity of a polished surface is quite low (D) The emissivity of a non-metallic surface decreases with increase in the temperature

Description : Pick out the wrong statement. (A) The emissivity of a surface decreases, if it gets corroded by atmospheric environment (B) The emissivity of a surface increases with increase in surface roughness ... quite low (D) The emissivity of a non-metallic surface decreases with increase in the temperature

Last Answer : (A) The emissivity of a surface decreases, if it gets corroded by atmospheric environment

The volume of a gas is directly proportional to the number of molecules of the gas.  a. Ideal gas law  b. Boyle-Mariotte Law  c. Avogadro’s Hypothesis  d. Gay-Lussac’s Law of combining Volumes

Description : The volume of a gas is directly proportional to the number of molecules of the gas.  a. Ideal gas law  b. Boyle-Mariotte Law  c. Avogadro’s Hypothesis  d. Gay-Lussac’s Law of combining Volumes

Last Answer : Avogadro’s Hypothesis

The acceleration of a particular body is directly proportional to the resultant force acting on it & inversely proportional to its mass.  a. Pascal's Law  b. Joule's Law  c. Newton's Law  d. None of the above

Description : The acceleration of a particular body is directly proportional to the resultant force acting on it & inversely proportional to its mass.  a. Pascal's Law  b. Joule's Law  c. Newton's Law  d. None of the above

Last Answer : Newton's Law

What is used for predicting the behavior of non-ideal gases?  a. Compressibility factor  b. Expansivity factor  c. Emissivity factor  d. Van-d-whal’s factor

Description : What is used for predicting the behavior of non-ideal gases?  a. Compressibility factor  b. Expansivity factor  c. Emissivity factor  d. Van-d-whal’s factor

Last Answer : Compressibility factor

What is the emissivity of a black body?  A. 0  B. 1  C. 0.5  D. 0.25

Description : What is the emissivity of a black body?  A. 0  B. 1  C. 0.5  D. 0.25

Last Answer : 1

What refers to the rate of thermal radiation emitter per unit area of a body?  A. Thermal conductivity  B. Absorptivity  C. Emissivity  D. Emissive power

Description : What refers to the rate of thermal radiation emitter per unit area of a body?  A. Thermal conductivity  B. Absorptivity  C. Emissivity  D. Emissive power

Last Answer : Emissive power

What gas thermometer is based on the principle that at low pressure, the temperature of a gas is proportional to its pressure at constant volume?  A. Constant-pressure gas thermometer  B. Isobaric gas thermometer  C. Isometric gas thermometer  D. Constant-volume gas thermometer

Description : What gas thermometer is based on the principle that at low pressure, the temperature of a gas is proportional to its pressure at constant volume?  A. Constant-pressure gas thermometer  B. Isobaric gas thermometer  C. Isometric gas thermometer  D. Constant-volume gas thermometer

Last Answer : Constant-volume gas thermometer

Carnot cycle efficiency depends upon  (a) properties of the medium/substance used  (b) condition of engine  (c) working condition  (d) temperature range of operation  (e) effectiveness of insulating material around the engine.

Description : Carnot cycle efficiency depends upon  (a) properties of the medium/substance used  (b) condition of engine  (c) working condition  (d) temperature range of operation  (e) effectiveness of insulating material around the engine.

Last Answer : Answer : d

For a body cooling in a draft, the rate of heat loss is proportional to the difference in temperature between the body and its surroundings.  a. Nemst Effect  b. Caloric Theory  c. Joule’s Law  d. Newton’s Law of Cooling

Description : For a body cooling in a draft, the rate of heat loss is proportional to the difference in temperature between the body and its surroundings.  a. Nemst Effect  b. Caloric Theory  c. Joule’s Law  d. Newton’s Law of Cooling

Last Answer : Newton’s Law of Cooling

What Law states that the pressure of gas is inversely proportional to its volume at constant temperature?  a. Charles’ law  b. Gay-Lussac’s Law  c. Boyle’s Law  d. Dalton’s Law

Description : What Law states that the pressure of gas is inversely proportional to its volume at constant temperature?  a. Charles’ law  b. Gay-Lussac’s Law  c. Boyle’s Law  d. Dalton’s Law

Last Answer : Boyle’s Law

According to Avogadro’s law, for a given pressure and temperature, each molecule of a gas  (a) occupies volume proportional to its molecular weight  (b) occupies volume proportional to its specific weight  (c) occupies volume inversely proportional to its molecular weight  (d) occupies volume inversely proportional to its specific weight  (e) occupies same volume.

Description : According to Avogadro's law, for a given pressure and temperature, each molecule of a gas  (a) occupies volume proportional to its molecular weight  (b) occupies volume proportional to its specific ...  (d) occupies volume inversely proportional to its specific weight  (e) occupies same volume.

Last Answer : Answer : e

Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to  (a) T  (b) j  (c) J2  (d) Vr  (e) 1/Vr.

Description : Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to  (a) T  (b) j  (c) J2  (d) Vr  (e) 1/Vr.

Last Answer : Answer : a

Without electrical, mechanical, gravitational, surface tension and motion effects, a system is called _____ system.  A. Simple  B. Simple compressible  C. Compressible  D. Independent

Description : Without electrical, mechanical, gravitational, surface tension and motion effects, a system is called _____ system.  A. Simple  B. Simple compressible  C. Compressible  D. Independent

Last Answer : Simple compressible

According to Gay-Lussac law, the absolute pressure of a given mass of a perfect gas varies __________ as its absolute temperature, when the volume remains constant.  A. directly  B. indirectly

Description : According to Gay-Lussac law, the absolute pressure of a given mass of a perfect gas varies __________ as its absolute temperature, when the volume remains constant.  A. directly  B. indirectly

Last Answer : Answer: A

According to Gay-Lussac law for a perfect gas, the absolute pressure of given mass varies directly as  (a) temperature  (b) absolute  (c) absolute temperature, if volume is kept constant (d) volume, if temperature is kept constant  (e) remains constant,if volume and temperature are kept constant.

Description : According to Gay-Lussac law for a perfect gas, the absolute pressure of given mass varies directly as  (a) temperature  (b) absolute  (c) absolute temperature, if volume is kept constant ... , if temperature is kept constant  (e) remains constant,if volume and temperature are kept constant.

Last Answer : Answer : c

What is a body that emits a constant emissivity regardless of the wavelength?

Description : What is a body that emits a constant emissivity regardless of the wavelength?  A. Gray body  B. Black body  C. Real body  D. White body

Last Answer : Gray body

Change in enthalpy of a system is the heat supplied at  (a) constant pressure  (b) constant temperature  (c) constant volume  (d) constant entropy  (e) N.T.P. condition.

Description : Change in enthalpy of a system is the heat supplied at  (a) constant pressure  (b) constant temperature  (c) constant volume  (d) constant entropy  (e) N.T.P. condition.

Last Answer : Answer : a

The condition of perfect vacuum, i.e., absolute zero pressure can be attained at  (a) a temperature of – 273.16°C  (b) a temperature of 0°C  (c) a temperature of 273 °K  (d) a negative pressure and 0°C temperature  (e) can’t be attained.

Description : The condition of perfect vacuum, i.e., absolute zero pressure can be attained at  (a) a temperature of – 273.16°C  (b) a temperature of 0°C  (c) a temperature of 273 °K  (d) a negative pressure and 0°C temperature  (e) can’t be attained.

Last Answer : Answer : a

For most solids, the coefficient of volume expansion is _________ the coefficient of linear expansion.  a. unrelated to  b. proportional to  c. twice  d. three times

Description : For most solids, the coefficient of volume expansion is _________ the coefficient of linear expansion.  a. unrelated to  b. proportional to  c. twice  d. three times

Last Answer : three times

“At constant pressure, the volume of a gas is inversely proportional to the pressure”. This is known as ______.  A. Boyle’s Law  B. Charles’s Law  C. Gay-Lussac Law  D. Ideal gas law

Description : “At constant pressure, the volume of a gas is inversely proportional to the pressure”. This is known as ______.  A. Boyle’s Law  B. Charles’s Law  C. Gay-Lussac Law  D. Ideal gas law

Last Answer : Boyle’s Law

To what conditions does a gas behave like an ideal gas?  a. low temperature and low pressure  b. low temperature and high pressure  c. high temperature and low pressure  d. high temperature and high pressure

Description : To what conditions does a gas behave like an ideal gas?  a. low temperature and low pressure  b. low temperature and high pressure  c. high temperature and low pressure  d. high temperature and high pressure

Last Answer : high temperature and low pressure

Which of the following represents the perpetual motion of the first kind  (a) engine with 100% thermal efficiency  (b) a fully reversible engine  (c) transfer of heat energy from low temperature source to high temperature source  (d) a machine that continuously creates its own energy  (e) production of energy by temperature differential in sea water at different levels.

Description : Which of the following represents the perpetual motion of the first kind  (a) engine with 100% thermal efficiency  (b) a fully reversible engine  (c) transfer of heat energy from low ... its own energy  (e) production of energy by temperature differential in sea water at different levels.

Last Answer : Answer : d

Copper is often used as an electrical conductor because it _______________. A. has high resistance at low temperatures B. has a highly polished surface C. is able to pass current with little opposition D. holds insulation together well

Description : Copper is often used as an electrical conductor because it _______________. A. has high resistance at low temperatures B. has a highly polished surface C. is able to pass current with little opposition D. holds insulation together well

Last Answer : Answer: C

Which of the following have the highest thermal conductivities?  a. liquids  b. gases  c. metals  d. solids other than metals

Description : Which of the following have the highest thermal conductivities?  a. liquids  b. gases  c. metals  d. solids other than metals

Last Answer : metals

Any characteristic of a thermodynamics system is called a _____.  A. Property  B. Process  C. Phase  D. Cycle

Description : Any characteristic of a thermodynamics system is called a _____.  A. Property  B. Process  C. Phase  D. Cycle

Last Answer : Property

The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is  (a) 29.27 J/kmol°K  (b) 83.14J/kmol°K  (c) 848J/kmol°K  (d) All J/kmol °K  (e) 735 J/kmol °K.

Description : The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is  (a) 29.27 J/kmol°K  (b) 83.14J/kmol°K  (c) 848J/kmol°K  (d) All J/kmol °K  (e) 735 J/kmol °K.

Last Answer : Answer : b

The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is  (a) 29.27 kgfm/mol°K  (b) 8314kgfm/mol°K  (c) 848kgfm/mol°K  (d) 427kgfm/mol°K  (e) 735 kgfm/mol°K.

Description : The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is  (a) 29.27 kgfm/mol°K  (b) 8314kgfm/mol°K  (c) 848kgfm/mol°K  (d) 427kgfm/mol°K  (e) 735 kgfm/mol°K.

Last Answer : Answer : c

The same volume of all gases would represent their  (a) densities  (b) specific weights  (c) molecular weights  (d) gas characteristic constants  (e) specific gravities.

Description : The same volume of all gases would represent their  (a) densities  (b) specific weights  (c) molecular weights  (d) gas characteristic constants  (e) specific gravities.

Last Answer : Answer : c

Characteristic gas constant of a gas is equal to  (a) C/Cv  (b) Cv/Cp  (c) Cp – Cv  (d) Cp + Cv  (e) Cp x Cv

Description : Characteristic gas constant of a gas is equal to  (a) C/Cv  (b) Cv/Cp  (c) Cp – Cv  (d) Cp + Cv  (e) Cp x Cv

Last Answer : Answer : c

The changing of solid directly to vapor without passing through liquid state is called  a. Evaporation  b. Vaporization  c. Sublimation  d. Condensation

Description : The changing of solid directly to vapor without passing through liquid state is called  a. Evaporation  b. Vaporization  c. Sublimation  d. Condensation

Last Answer : Sublimation

A simple steam engine receives steam from the boiler at 180˚C and exhausts directly into the air at 100˚C. What is the upper limit of its efficiency?  a. 11.28 %  b. 36.77 %  c. 20.36 %  d. 17.66 %

Description : A simple steam engine receives steam from the boiler at 180˚C and exhausts directly into the air at 100˚C. What is the upper limit of its efficiency?  a. 11.28 %  b. 36.77 %  c. 20.36 %  d. 17.66 %

Last Answer : 17.66 %

The heat absorbed by a unit mass of a material at its holding point in order to convert the material into a gas at the same temperature.  a. Latent Heat of Sublimation  b. Latent Heat of Vaporization  c. Latent Heat of Fusion  d. Latent Heat Of Condensation

Description : The heat absorbed by a unit mass of a material at its holding point in order to convert the material into a gas at the same temperature.  a. Latent Heat of Sublimation  b. Latent Heat of Vaporization  c. Latent Heat of Fusion  d. Latent Heat Of Condensation

Last Answer : Latent Heat of Vaporization

Boiling temperature of a material is dependent on its _________.  a. volume  b. power  c. heat  d. pressure

Description : Boiling temperature of a material is dependent on its _________.  a. volume  b. power  c. heat  d. pressure

Last Answer : pressure

Which of the following does not determine the amount of internal energy an object has?  a. temperature  b. amount of material  c. type of material  d. shape of the object

Description : Which of the following does not determine the amount of internal energy an object has?  a. temperature  b. amount of material  c. type of material  d. shape of the object

Last Answer : shape of the object

Carbonisation of coal consists of  A. drying and crushing the coal to a fine powder  B. moulding the finely ground coal under pressure with or without a binding material  C. heating the wood with a limited supply of air to temperature not less than 280°C  D. none of the above

Description : Carbonisation of coal consists of  A. drying and crushing the coal to a fine powder  B. moulding the finely ground coal under pressure with or without a binding material  C. heating the wood with a limited supply of air to temperature not less than 280°C  D. none of the above

Last Answer : Answer: D

What refers to the thermodynamic properties which are independent on the amount of the substance present?  a. Extensive property  b. Intensive properties  c. Reversible properties  d. Irreversible properties

Description : What refers to the thermodynamic properties which are independent on the amount of the substance present?  a. Extensive property  b. Intensive properties  c. Reversible properties  d. Irreversible properties

Last Answer : Intensive properties

How many independent properties are required to completely fix the equilibrium state of a pure gaseous compound?  a. 4  b. 3  c. 2  d. 1

Description : How many independent properties are required to completely fix the equilibrium state of a pure gaseous compound?  a. 4  b. 3  c. 2  d. 1

Last Answer : 2

A _________ is a quantity whose value at any state is independent of the path or process used to reach that state.  a. cycle  b. path function  c. point function  d. process

Description : A _________ is a quantity whose value at any state is independent of the path or process used to reach that state.  a. cycle  b. path function  c. point function  d. process

Last Answer : point function

How many independent properties are required to completely fix the equilibrium state of a pure gaseous compound?  A. 4  B. 3  C. 2  D. 1

Description : How many independent properties are required to completely fix the equilibrium state of a pure gaseous compound?  A. 4  B. 3  C. 2  D. 1

Last Answer : 2

“The state of a simple compressible system is completely specified by two independent, intensive properties”. This is known as ______.  A. Equilibrium postulate  B. State postulate  C. Environment postulate  D. Compressible system postulate

Description : “The state of a simple compressible system is completely specified by two independent, intensive properties”. This is known as ______.  A. Equilibrium postulate  B. State postulate  C. Environment postulate  D. Compressible system postulate

Last Answer : State postulate

The thermodynamic properties that are independent on the size of the system is called _____.  A. Extensive property  B. Intensive property  C. Open property  D. Closed property

Description : The thermodynamic properties that are independent on the size of the system is called _____.  A. Extensive property  B. Intensive property  C. Open property  D. Closed property

Last Answer : Intensive property

A wall of the firebrick has an inside temperature of 313ºF and an outside temperature of 73ºF. What is the difference in the surface temperature in Rankin?  a. 70  b. 68  c. 72  d. 94 ºR = ºF + 460

Description : A wall of the firebrick has an inside temperature of 313ºF and an outside temperature of 73ºF. What is the difference in the surface temperature in Rankin?  a. 70  b. 68  c. 72  d. 94 ºR = ºF + 460

Last Answer : 70

Temperature of a gas is produced due to  (a) its heating value  (b) kinetic energy of molecules  (c) repulsion of molecules  (d) attraction of molecules  (e) surface tension of molecules.

Description : Temperature of a gas is produced due to  (a) its heating value  (b) kinetic energy of molecules  (c) repulsion of molecules  (d) attraction of molecules  (e) surface tension of molecules.

Last Answer : Answer : b

The weight of an object is 50lb. What is its mass at standard condition?  a. 50 lbm  b. 60 lbm  c. 70 lbm  d. 80 lbm formula: m = Fgk /g

Description : The weight of an object is 50lb. What is its mass at standard condition?  a. 50 lbm  b. 60 lbm  c. 70 lbm  d. 80 lbm formula: m = Fgk /g

Last Answer : 50 lbm

What is the specific weight of water at standard condition? (Formula: γ = ρg / k)  a. 1000 kgm/m3  b. 9.8066 m/s2  c. 1000 kgf/m3  d. None of the above

Description : What is the specific weight of water at standard condition? (Formula: γ = ρg / k)  a. 1000 kgm/m3  b. 9.8066 m/s2  c. 1000 kgf/m3  d. None of the above

Last Answer : 1000 kgf/m3