📝 [ME] QB ID: 0418 | Essential & Supplementary Elements | Set 09

It refers to the ratio of the rate of heat transferred by conduction to the rate of energy stored.

Which of the following requires the greatest amount of heat per kilogram for a given increase in temperature?

A hot block is cooled by blowing cool air over its top surface. The heat that is first transferred to the air layer close to the block is by conduction. It is eventually carried away from the surface by:

A positive displacement pump consisting of a fix casing containing gears, cams, screws, vanes, plungers, or similar elements actuated by rotation of the drive shaft.

All heat transfer processes require a medium of energy exchange except:

It is term used to describe the energy of a body that can be transmitted in the form of heat.

Which of the following is the equivalent heat transferred of a gas undergoing isometric process?

Thermal conduction is described by:

Convection is described by which of the following laws?

Radiation heat transfer is described by:

A type of reciprocating pump driven by compound cross compound, or triple expansion steam engines.

What refers to an ideal body that absorbs all of the radiant energy that intrudes on it and also emits the maximum possible energy when acting as a source?

The thermal resistance for one dimensional steady conduction heat transfer through cylindrical wall in the radial direction is expressed in which of the following functions?

The law which states that “the ratio of the emissive powers to absorptivities are equal when the two bodies are in thermal equilibrium” is known as:

The equivalent of ratio of emissive power to absorptivity for bodies in thermal equilibrium is described by:

A positive displacement unit wherein the pumping action is accomplished by the forward and backward movement of a position or plunger inside a cylinder usually provided with valves.

The temperature potential between temperature at the two ends of a heat exchanger are given by:

Which of the following best describe function of heat exchanger?

What refers to a form of energy associated with the kinetic random motion of large number of molecules?

A type of rotary pump, consist of an eccentrically bored cam rotated by a shaft concentric in a cylindrically bored casing, with an aburment or follower so arranged that with each rotation of the drive shaft a positive quantity of liquid is displaced from the space between the cam and the pump casing.

The term “exposure” in radiological is used as a measure of a gamma ray or an X-ray field in the surface of an exposed object. Since this radiation produces ionization of the air surrounding the object, the exposure is obtained as:

How do you call a phenomenon wherein the heat is transferred by motion of fluid under the action of mechanical device?

The passing of heat energy from molecule to molecule through a substance:

A type of rotary pump, consists of two or more gears, operating in closely fitted casing so arranged that when the gear teeth unmesh on one side liquid fills the space between the gear teeth and is carried around in the tooth space to the opposite side and displaced as the teeth mesh again.

A body that is hot compared to its surroundings illuminates more energy than they give. The heat is transferred from one to another by energy wave motion. What is this mode of heat transfer?

What is the heat transfer due to density differential?

What do you call the passing of heat energy from molecule to molecule through substance?

A type of rotary pump, consists of two or three screw rotors so arranged that as the rotors turn liquid fills the shape between the screw threads and is displaced axially as the rotor threads mesh.

A type of rotary pump, consists of one rotor in a casing machined eccentrically to the drive shaft. The rotor is fitted with a series of vanes, blades or buckets which follow the bore of the casing thereby displacing the liquid with each revolution of the drive shaft.

Which of the following is the emissivity of white body?

The mechanism of heat transfer in which there is no medium (i.e. water, air, solid concrete) required for the heat energy to travel is:

What do you call a change of phase directly from vapor to solid without passing through the liquid state?

Which of the following is the Stefan-Boltzmann constant?

What is the usual value of transmissivity for opaque materials?

A body whose emissivity is less than 1 is known as a real body. What is the other term for real body?

A type of reciprocating pump having a steam cylinder with no lap on valves, a water cylinder and a common piston rod.

What kind of heat exchanger where water is heated to a point that dissolved gases are liberated?

A hot block is cooled by blowing cool air over its top surface. The heat that is first transferred to the air layer close to the block is by conduction. It is eventually carried away from the surface by _____.

A type of reciprocating pump that receives its forward and backward motion of the piston and plunger from the rotary motion of a revolving crankshaft by means of a crank and connecting rod.

Heat transfer processes which include a change of phase of a fluid are considered _____.

How much is the part of light that is absorbed by the body that transmits and reflects 80% and 10% respectively?

In convection heat transfer, what happens to the heat transfer coefficient if the viscosity of the fluid increases?

A type of deep well pump which are refinement of the old hand pump that have played such an important role in the country home and small town water supply from wells.

A substance that is able to absorb liquids or gases and is used for removing them from a given medium or region.

A type of deep well pump that represent the application of vertical centrifugal pump to deep well service and are built for heads up to 305 meters and for capacities up to 26,495 liters per minute.

Heat transfer due to density differential:

A type of deep well pump that has come into wide use for small capacities combines a single stage centrifugal pump at the top of the well and an ejector or jet located down in the water.

The ratio of the radiation of actual body to the radiation of a blackbody is known as _____.

Which of the following is the usual geometric view factor for a black body?

What happens to the heat transferred radially across insulated pipe per unit area?

The rate at which an object radiates electromagnetic energy does depend on its:

Sublimation refers to:

Which of the following statements is based on Prevost theory of heat exchange?

A type of deep well pump wherein compressed air is admitted to the well to lift water to the surface, for successful operation of the system, the discharge pipe must have its lower end submerged in the well water.

One of the reasons for insulating the pipes is:

The temperature potential between temperature at the two ends of a heat exchanger are given by:

The rate of radiant energy, that is emitted by a surface at any temperature and in small wavelengths is found from the known rate of energy, that under the same conditions will be emitted from a black surface, by multiplying with the absorptivity. The above enunciation is called:

The energy of a body that can be transmitted in the form of heat.

Which of the following is generally used to measure the temperature inside the furnace?

The function of a super heater is to:

All heat transfer processes:

What do you call the effectiveness of a body as a thermal radiator at a given temperature?

It refers to the ratio of the internal thermal resistance of a solid to the boundary layer thermal resistance (or external resistance of the body).

The natural direction of the heat between two reservoirs is dependent on which of the following?

What is thermal diffusivity?

In an isometric process, the heat transferred is equal to:

Which of the following is a unit of thermal diffusivity?

An electrically charged atom or radical which carries electricity through an electrolyte is called:

For glass wool thermal conductivity changes from sample to sample due changes in:

Radiant heat transfer is described by:

Which of the following is the S.I. unit of thermal conductivity?

Which of the following is the reason for insulating the pipes?

What is the value of the Prandt’l number for air?

A reservoir that absorbs energy in the form of heat is called _____.

Heat is conducted in the direction of:

According to Prevost theory of heat exchange:

Why are metals good conductors of heat?

Thermal conductivity of wood depends on which of the following?

The function of a heat exchanger is to:

A fur coat on an animal will help the animal to remain:

A theoretical body which when heated to incandescence would emit a continuous light-ray spectrum.

The nature of flow of a fluid inside a tube, whether it is turbulent or laminar, can be ascertained by:

A type of radiation consisting of singly charged particles that generate to intermediate distances.

By which of the following modes of heat transfer is the Stefan-Boltzmann law applicable?

The heat transfer term in the first law of thermodynamics may be due to any of the following except:

The radiant heat transfer depends on:

At all wave lengths and temperatures the monochromatic emissivity of a white body is equal to:

When the entire heat exchanger is selected as control volume, heat becomes _____.

The radiation from flames is having:

How do you classify a body that has an emissivity factor of 0.7?

At what particular condition that no more heat can that be removed from a substance and the temperature can no longer be lowered?

What refers to the heat transfer wherein the heat is transferred from one point to another by actual movement of substance?

What is the series of processes that eventually bring the system back to its original condition?

The statement that the emissivity and absorptivity of a surface is surrounded by its own temperature are the same for both monochromatic and total radiation is called:

What do you call a substance that is able to absorb liquids or gases and is usually used for removing liquids (or gases) from a given medium or region?

In which direction that heat is transferred through conduction?

A reservoir that supplies energy in the form of heat is called:

Non-isotropic conductivity is shown by which of the following?

In regenerator type heat exchanger, heat transfer occurs by:

In the process of freeze dying, ice goes directly into water vapor. What is the temperature at which this process can take place?

What usually happen when a vapor condenses into a liquid?

In a cooling tower, the water is cooled mainly by:

The transmission of heat from one place to another by fluid circulation between the spots of different temperature is called _____.

Least value of Prandt’l number can be excepted in case of _____.

“The boiling point of a solution is a linear function of water at the same pressure.” The above statement is called _____.

In order to emit electromagnetic radiation, an object must be at a temperature:

Floating heads are provided in heat exchangers to:

In natural convection a heated portion of a fluids moves because:

What do you call the first stage of crystal formation?

In heat exchanger design, on transfer unit implies:

Dritus Boelter equation can be applied in case of fluids flowing in:

In sugar mills can just is evaporated in:

A 1-2 heat exchanger refers to which of the following?

A correction of LMTD is essential in case of:

Which of the following is used as entrainer in acetic acid-water separation?