What type of weathering is thermal heat expansion and contraction?

What type of weathering is thermal heat expansion and contraction?
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Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the (A) Packing may be crushed due to thermal expansion/contraction of the components of the equipments (B) Pressure drop in the equipment will be very high (C) Viscosity variation of the fluids may cause channelling/flooding (D) None of these

Description : Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the (A) Packing may be crushed due to thermal expansion/contraction of the ... C) Viscosity variation of the fluids may cause channelling/flooding (D) None of these

Last Answer : (A) Packing may be crushed due to thermal expansion/contraction of the components of the equipments

A stress which develops within an object when it attempts to expand or contract in response to a temperature changes, but cannot, due to being held rigidly in place.  a. elongation  b. thermal stress  c. expansion contraction  d. thermal expansion

Description : A stress which develops within an object when it attempts to expand or contract in response to a temperature changes, but cannot, due to being held rigidly in place.  a. elongation  b. thermal stress  c. expansion contraction  d. thermal expansion

Last Answer : thermal stress

A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1, K-1is (A) -1.87 (B) 0 (C) 1.26 (D) 3.91

Description : A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. ... .kg-1, K-1is (A) -1.87 (B) 0 (C) 1.26 (D) 3.91

Last Answer : (B) 0

Which of the following are methods of heat transfer? (1) Convection (2) Evaporation (3) Revolution (4) Thermal Expansion

Description : Which of the following are methods of heat transfer? (1) Convection (2) Evaporation (3) Revolution (4) Thermal Expansion

Last Answer : (1) Convection Explanation: Convection is the transfer of heat from one place to another by the movement of fluids. It is usually the dominant form of heat transfer (convection) in liquids and ... the combined processes of conduction (heat diffusion) and advection (heat transfer by bulk fluid flow).

In a heat exchanger, floating head is provided to (A) Facilitate cleaning of the exchanger (B) Increase the heat transfer area (C) Relieve stresses caused by thermal expansion (D) Increase log mean temperature gradient

Description : In a heat exchanger, floating head is provided to (A) Facilitate cleaning of the exchanger (B) Increase the heat transfer area (C) Relieve stresses caused by thermal expansion (D) Increase log mean temperature gradient

Last Answer : (C) Relieve stresses caused by thermal expansion

__________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant. (A) Pyrex (B) Soda lime (C) Lead (D) High silica

Description : __________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant. (A) Pyrex (B) Soda lime (C) Lead (D) High silica

Last Answer : (A) Pyrex

(1/V) (∂V/∂T)Pis the mathematical expression (A) Joule-Thomson co-efficient (B) Specific heat at constant pressure (Cp) (C) co-efficient of thermal expansion (D) Specific heat at constant volume (CV)

Description : (1/V) (∂V/∂T)Pis the mathematical expression (A) Joule-Thomson co-efficient (B) Specific heat at constant pressure (Cp) (C) co-efficient of thermal expansion (D) Specific heat at constant volume (CV)

Last Answer : (C) co-efficient of thermal expansion

What is a measure of the ability of a material to conduct heat?  A. Specific heat capacity  B. Coefficient of thermal expansion  C. Coefficient of thermal conductivity  D. Thermal conductivity

Description : What is a measure of the ability of a material to conduct heat?  A. Specific heat capacity  B. Coefficient of thermal expansion  C. Coefficient of thermal conductivity  D. Thermal conductivity

Last Answer : Thermal conductivity

Which of the following are methods of heat transfer? (1) Convection (2) Evaporation (3) Revolution (4) Thermal Expansion

Description : Which of the following are methods of heat transfer? (1) Convection (2) Evaporation (3) Revolution (4) Thermal Expansion

Last Answer : Convection

What is the breaking of rocks due constant expansion and contraction called?

Description : What is the breaking of rocks due constant expansion and contraction called?

Last Answer : Exfoliation.

Devaluation of currency leads to - (1) expansion of export trade (2) contraction of import trade (3) expansion of import substitution (4) All of the above

Description : Devaluation of currency leads to - (1) expansion of export trade (2) contraction of import trade (3) expansion of import substitution (4) All of the above

Last Answer : (4) All of the above Explanation: Devaluation in modern monetary policy is a reduction in the value of a currency with respect to those goods, services or other monetary units with which ... deficit. Import substitution means promotion of export to replace imports. It is also fallout of devaluation.

In a railway track, two rails are joined end to end with a gap in between them because – (1) steel can be saved (2) accidents due to contraction in winter can be avoided (3) air-gaps are necessary for bearing the weight of running train (4) accidents due to expansion in summer can be avoided.

Description : In a railway track, two rails are joined end to end with a gap in between them because – (1) steel can be saved (2) accidents due to contraction in winter can be avoided (3) air-gaps are necessary for bearing the weight of running train (4) accidents due to expansion in summer can be avoided.

Last Answer : (4) accidents due to expansion in summer can be avoided. Explanation: The volume of materials changes depending on current temperature. Usually heat makes them expand, and cold leads them to contract. ... on the tracks. The same applies in many other fields of engineering, i.e. bridge building.

In a railway track, two rails are joined end to end with a gap tin between them because? A. Steel can be saved B. Accidents due to contraction in winter can be avoided C. Air gaps are necessary for bearing the weight of running train D. Accidents due to expansion in summer can be avoided (Answer) E. All of these

Description : In a railway track, two rails are joined end to end with a gap tin between them because? A. Steel can be saved B. Accidents due to contraction in winter can be avoided C. Air gaps are necessary ... of running train D. Accidents due to expansion in summer can be avoided (Answer) E. All of these

Last Answer : D. Accidents due to expansion in summer can be avoided (Answer)

Major loss in sudden contraction in pipe flow is due to (A) Boundary friction (B) Flow contraction (C) Expansion of flow after sudden contraction (D) None of these

Description : Major loss in sudden contraction in pipe flow is due to (A) Boundary friction (B) Flow contraction (C) Expansion of flow after sudden contraction (D) None of these

Last Answer : (B) Flow contraction

Disc compensators are provided in large diameter fuel gas carrying pipelines to (A) Keep the pipe in proper orientation (B) Make the pipe joint leak-proof (C) Account for contraction/expansion of pipe due to temperature changes of the surroundings (D) Account for the pressure variation side the pipeline

Description : Disc compensators are provided in large diameter fuel gas carrying pipelines to (A) Keep the pipe in proper orientation (B) Make the pipe joint leak-proof (C) Account for contraction/expansion ... due to temperature changes of the surroundings (D) Account for the pressure variation side the pipeline

Last Answer : (C) Account for contraction/expansion of pipe due to temperature changes of the surroundings

Describe the effects of expansion and contraction of solids.

Description : Describe the effects of expansion and contraction of solids.

Last Answer : I. In hot summer, concrete in roads expands and road surface crack. II. Two sections of railway track are laid with gaps. If there are no gaps, then they may be de-shaped due to expansion ... gap is also present at this end. So that it can move forward and backward during expansion and contraction.

Explain the damages which are caused by expansion or contraction by giving two examples.

Description : Explain the damages which are caused by expansion or contraction by giving two examples.

Last Answer : I. In hot summer, the concrete used in roads expands. If no space is provided for its expansion, then road surface crack. II. Two sections of railway track are laid with gaps. If there are no gaps, then they may be de-shaped due to expansion in summer.

Explain the peculiar (strange) behavior of water during contraction and expansion.

Description : Explain the peculiar (strange) behavior of water during contraction and expansion.

Last Answer : On heating the liquid water from 0 0C to 4 0C, it contracts and its volume decreases while its density increases. On cooling from 4 0C to 0 0C it expands, its volume increases and density decreases.

To prevent compressive stresses in a rigid concrete pavement, the joint provided, is (A) Expansion joint (B) Contraction joint (C) Hinged joint (D) All the above

Description : To prevent compressive stresses in a rigid concrete pavement, the joint provided, is (A) Expansion joint (B) Contraction joint (C) Hinged joint (D) All the above

Last Answer : Answer: Option D

Tie bars in cement concrete pavements are at (A) Expansion joints (B) Contraction joints (C) Warping joints (D) Longitudinal joints

Description : Tie bars in cement concrete pavements are at (A) Expansion joints (B) Contraction joints (C) Warping joints (D) Longitudinal joints

Last Answer : Answer: Option D

The surface where two successive placements of concrete meet, is known as (A) Contraction joint (B) Expansion joint (C) Construction joint (D) Both (a) and (b)

Description : The surface where two successive placements of concrete meet, is known as (A) Contraction joint (B) Expansion joint (C) Construction joint (D) Both (a) and (b)

Last Answer : Answer: Option C

A partial denture that seats on the master cast but fails to seat correctly in the mouth is a result of, A. Contraction of the metal framework during casting B. Insufficient expansion of the investment material C. Distortion of impression D. Failure to block out unwanted undercuts

Description : A partial denture that seats on the master cast but fails to seat correctly in the mouth is a result of, A. Contraction of the metal framework during casting B. Insufficient expansion of the investment material C. Distortion of impression D. Failure to block out unwanted undercuts

Last Answer : C. Distortion of impression

Why would you invest the wax pattern as soon as possible in an indirect inlay fabrication: A. Minimise distortion B. Avoid contraction C. Avoid expansion

Description : Why would you invest the wax pattern as soon as possible in an indirect inlay fabrication: A. Minimise distortion B. Avoid contraction C. Avoid expansion

Last Answer : A. Minimise distortion

When dry cast is immersed in water saturated with calcium sulphate:** A. There is contraction B. There is negligible expansion C. There is definite expansion D. There is no change E. None of the above

Description : When dry cast is immersed in water saturated with calcium sulphate:** A. There is contraction B. There is negligible expansion C. There is definite expansion D. There is no change E. None of the above

Last Answer : B. There is negligible expansion

A period of expansion and contraction measured by real GDP is called (a) Business cycle (b) Expansion © Recession (d) Contraction

Description : A period of expansion and contraction measured by real GDP is called (a) Business cycle (b) Expansion © Recession (d) Contraction

Last Answer : (a) Business cycle

Which of the following phases describes the phase of business cycle that occurs after a trough and before a peak (a) Lag (b) Consolidation © Expansion (d) Contraction

Description : Which of the following phases describes the phase of business cycle that occurs after a trough and before a peak (a) Lag (b) Consolidation © Expansion (d) Contraction

Last Answer : © Expansion

45 The function of conservator in a transformer is A. To protect against internal fault B. To reduce copper as well as core losses C. To cool the transformer oil D. To take care of the expansion and contraction of transformer oil due to variation of temperature of surroundings

Description : 45 The function of conservator in a transformer is A. To protect against internal fault B. To reduce copper as well as core losses C. To cool the transformer oil D. To take care of the expansion and contraction of transformer oil due to variation of temperature of surroundings

Last Answer : D. To take care of the expansion and contraction of transformer oil due to variation of temperature of surroundings

In a railway track, two rails are joined end to end with a gap in between thembecause (1) steel can be saved (2) accidents due to contraction in winter can be avoided (3) air-gaps are necessary for bearing the weight of running train (4) accidents due to expansion in summer can be avoided.

Description : In a railway track, two rails are joined end to end with a gap in between thembecause (1) steel can be saved (2) accidents due to contraction in winter can be avoided (3) air-gaps are necessary for bearing the weight of running train (4) accidents due to expansion in summer can be avoided.

Last Answer :  accidents due to expansion in summer can be avoided.

Devaluation of currency leads to (1) expansion of export trade (2) contraction of import trade (3) expansion of import substitution (4) All of the above

Description : Devaluation of currency leads to (1) expansion of export trade (2) contraction of import trade (3) expansion of import substitution (4) All of the above

Last Answer : All of the above

Type of bend that occurs as a result of differences in thermal contraction rates between the core and the cladding material. ∙ A. Macrobending ∙ B. Microbending ∙ C. Quad bending ∙ D. Constant-radius bending

Description : Type of bend that occurs as a result of differences in thermal contraction rates between the core and the cladding material. ∙ A. Macrobending ∙ B. Microbending ∙ C. Quad bending ∙ D. Constant-radius bending

Last Answer : B. Microbending

Type of bend that occurs as a result of differences in thermal contraction rates between the core and the cladding material.

Description : Type of bend that occurs as a result of differences in thermal contraction rates between the core and the cladding material.

Last Answer : Microbending

State applications of thermal expansion.

Description : State applications of thermal expansion.

Last Answer : State applications of thermal expansion.

Derive the relation between three coefficients of thermal expansion.

Description : Derive the relation between three coefficients of thermal expansion.

Last Answer : Derive the relation between three coefficients of thermal expansion.

What is the main source of energy for most processe undergoing thermal expansion?

Description : What is the main source of energy for most processe undergoing thermal expansion?

Last Answer : Thermal energy is the main source of energy for most processeundergoing thermal expansion

What happens to a substance that is undergoing thermal expansion?

Description : What happens to a substance that is undergoing thermal expansion?

Last Answer : The dimension of the sample increases; the chemical composition remain unchanged.

The thermal expansion of a solid is caused by?

Description : The thermal expansion of a solid is caused by?

Last Answer : Increasing the amplitude of the atoms vibrations

Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its (A) High co-efficient of thermal expansion (B) Low thermal conductivity (C) High corrosion resistance (D) All (A), (B) and (C)

Description : Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its (A) High co-efficient of thermal expansion (B) Low thermal conductivity (C) High corrosion resistance (D) All (A), (B) and (C)

Last Answer : (C) High corrosion resistance

Duriron is (A) Acid resistant, brittle and very hard (B) High silicon iron (C) Prone to breakage due to thermal expansion because of its very high co￾efficient of thermal expansion (D) All (A), (B) and (C)

Description : Duriron is (A) Acid resistant, brittle and very hard (B) High silicon iron (C) Prone to breakage due to thermal expansion because of its very high co￾efficient of thermal expansion (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Which of the following is an undesirable property of a manometricliquid? (A) Non-sticky & non-corrosive nature (B) High vapour pressure (C) Low viscosity & surface tension (D) Low co-efficient of thermal expansion

Description : Which of the following is an undesirable property of a manometricliquid? (A) Non-sticky & non-corrosive nature (B) High vapour pressure (C) Low viscosity & surface tension (D) Low co-efficient of thermal expansion

Last Answer : (B) High vapour pressure

Superior quality laboratory apparatus is made of the __________ glass having low thermal co-efficient of expansion & high chemical resistance. (A) Flint (B) Soda (C) Pyrex (D) Potash

Description : Superior quality laboratory apparatus is made of the __________ glass having low thermal co-efficient of expansion & high chemical resistance. (A) Flint (B) Soda (C) Pyrex (D) Potash

Last Answer : (C) Pyrex

Pick out the wrong statement pertaining to the properties of glasses. Glasses generally have (A) High electrical insulation properties (B) Sharp melting points (C) Low co-efficient of thermal expansion (D) Compressive strength much greater than their tensile strengths

Description : Pick out the wrong statement pertaining to the properties of glasses. Glasses generally have (A) High electrical insulation properties (B) Sharp melting points (C) Low co-efficient of thermal expansion (D) Compressive strength much greater than their tensile strengths

Last Answer : (B) Sharp melting points

Co-efficient of thermal expansion of glass is decreased by the addition of __________ during its manufacture. (A) CaO (B) MnO2 (C) ZnO (D) FeS

Description : Co-efficient of thermal expansion of glass is decreased by the addition of __________ during its manufacture. (A) CaO (B) MnO2 (C) ZnO (D) FeS

Last Answer : (C) ZnO

Describe a simple experiment to study the thermal expansion of Gases.

Description : Describe a simple experiment to study the thermal expansion of Gases.

Last Answer : I. Take an empty flask and fit a cork into the mouth of the flask. II. Limb of the U shaped glass tube through the cork. III. Clamp the flask in a stand as shown in fig. IV. Dip the ... and produce bubbles in water. X. On cooling flask contracts and water level is pulled up in the glass tube.

What is thermal expansion? Explain it with the help of experiment.

Description : What is thermal expansion? Explain it with the help of experiment.

Last Answer : The expansion of material objects on heating is called thermal expansion. I. Take a metallic sphere which can pass easily through a ring. II. Remove the sphere out of the ring. III. Now heat the ... expansion due to heating. V. On cooling the sphere, it attracts and passes through the ring again.

The expression, nCv(T2- T1), is for the __________ of an ideal gas. (A) Work done under adiabatic condition (B) Co-efficient of thermal expansion (C) Compressibility (D) None of these

Description : The expression, nCv(T2- T1), is for the __________ of an ideal gas. (A) Work done under adiabatic condition (B) Co-efficient of thermal expansion (C) Compressibility (D) None of these

Last Answer : (A) Work done under adiabatic condition

The expression, nRT ln(P1/P2), is for the __________of an ideal gas. (A) Compressibility (B) Work done under adiabatic condition (C) Work done under isothermal condition (D) Co-efficient of thermal expansion

Description : The expression, nRT ln(P1/P2), is for the __________of an ideal gas. (A) Compressibility (B) Work done under adiabatic condition (C) Work done under isothermal condition (D) Co-efficient of thermal expansion

Last Answer : C) Work done under isothermal condition

Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal (A) Tensile strength (B) Compressive strength (C) Young's modulus (D) Thermal co-efficient of expansion

Description : Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal (A) Tensile strength (B) Compressive strength (C) Young's modulus (D) Thermal co-efficient of expansion

Last Answer : (D) Thermal co-efficient of expansion

Pick up the correct statement from the following: (A) Construction joints are necessarily planned for their locations (B) Expansion joints are provided to accommodate thermal expansion (C) Construction joints are provided to control shrinkage cracks (D) All the above

Description : Pick up the correct statement from the following: (A) Construction joints are necessarily planned for their locations (B) Expansion joints are provided to accommodate thermal expansion (C) Construction joints are provided to control shrinkage cracks (D) All the above

Last Answer : Answer: Option D

Pick up the correct statement from the following: (A) Plastics have generally low melting point (B) The coefficient of thermal expansion of plastics is about three times than that of steel (C) The acoustical boards prepared by impregnating fibre-glass with phenolic resins has absorption coefficient of about 0.67 (D) All the above

Description : Pick up the correct statement from the following: (A) Plastics have generally low melting point (B) The coefficient of thermal expansion of plastics is about three times than that of steel (C) ... fibre-glass with phenolic resins has absorption coefficient of about 0.67 (D) All the above

Last Answer : Answer: Option D