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4

In __________ process, there is an increase in entropy with no degradation of energy.

A. Isothermal expansion

B. Isochoric heat addition

C. Polytropic expansion

D. Isobaric heat addition

Correct Answer :

A. Isothermal expansion


Related Questions

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In chemical dehumidification process

A. Wet bulb temperature increases

B. Dry bulb temperature remains constant

C. Dew point temperature increases

D. Dry bulb temperature increases

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4

A solar cell converts the sunlight directly into __________ energy.

A. Thermal

B. Electrical

C. Mechanical

D. Chemical

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The order of a chemical reaction

A. Can be determined only experimentally

B. Can be determined from the stoichiometry of the reaction

C. Cannot be zero

D. Can be fractional

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4

The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?

A. 159

B. 1837

C. 2537

D. 10000

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4

Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of

A. Grashoff number

B. Grashoff number & Reynolds number

C. Reynolds number

D. Grashoff number & Prandtl number

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4

Wrought iron does not have

A. Uniform strength in all directions

B. Ability to hold protective coating

C. High ductility & corrosion resistance

D. Easily weldable characteristics

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Ganister contains maximum percentage of

A. FeO

B. SiO2

C. MgO

D. MnO2

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Blasting of tri-nitro-toluene (TNT) is done by mixing it with ammonium

A. Nitrate

B. Sulphate

C. Carbonate

D. Chloride

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Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as

A. Re0.5, Re0.8

B. Re0.8, Re-0.5

C. Re0.8, Re0.5

D. Re-0.8, Re0.5

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4

Drossing is a __________ operation.

A. Smelting

B. Dressing

C. Roasting

D. Dressing

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4

Glycerine is used as a coolant in cooling of some engines instead of water, because

A. Its higher boiling point (290°C) increases its heat carrying capacity

B. Comparatively less weight of coolant is required

C. Smaller radiator can be used

D. All a, b & c

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4

Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of

A. 1 : 1

B. 1 : 2

C. 2 : 1

D. 1 : 4

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4

Which of the following metals reacts violently with water?

A. Mercury

B. Sodium

C. Calcium

D. Magnesium

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4

Shampoos are commercially not available in the form of

A. Powder

B. Gaseous mixture

C. Solution

D. Emulsion

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Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per of steel strip.

A. 5-10

B. 1000-1500

C. 120-500

D. 1500-3000

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4

Normalising does not __________ of a metal.

A. Improve machinability & tensile strength

B. Remove internal stresses

C. Refine the structure

D. Remove strains caused by cold working

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What is the value of included angle of a triangular notch for maximum discharge?

A. 30°

B. 60°

C. 90°

D. 120°

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The bolt is subjected to __________ when the nut is tightened by putting the washer beneath it.

A. Tension

B. Shear

C. Compression

D. Bending & tension

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With increase in __________ Knocking tendency in a spark ignition petrol engine decreases.

A. Supercharging

B. Wall temperature

C. Compression ratio

D. Engine speed

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4

The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong

A. Base and strong acid

B. Base and weak acid

C. Acid and weak base

D. None of these

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4

Catalyst used in the catalytic converter employed in automobiles to convert CO into CO2 and for complete oxidation of un-burnt hydrocarbons is

A. Nickel

B. Cobalt

C. Vanadium

D. Platinum

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Euler number is defined as the ratio of inertia force to __________ force.

A. Pressure

B. Elastic

C. Gravity

D. Viscous

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Reduction in the grain size reduces the __________ of the material.

A. Fatigue resistance

B. Tensile strength

C. Creep resistance

D. All (A), (B) & (C)

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Electrochemical corrosion can occur, only if __________ is present in contact with metal.

A. Air

B. Oxygen

C. Liquid medium

D. Gaseous medium

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__________ test determines the yield strength, Young's modulus of elasticity, percentage reduction in area & percentage elongation of a material.

A. Tensile

B. Fatigue

C. Impact

D. None of these

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Inertial forces are obtained, when the elastic forces are multiplied by __________ number.

A. Mach

B. Froude

C. Reynolds

D. Euler

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High endurance limit of carburised machine parts is because of the fact that carburisation

A. Suppresses any stress concentration produced in the parts

B. Enhances the yield point of the material

C. Introduces a compressive layer on the surface

D. Produces a better surface finish

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4

Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its

A. Lower cost

B. Abundant availability

C. Resistance to vegetable acids as the tin plate are commercially used in 'canning' industry

D. None of these

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4

The material used for coating the welding electrode is termed as the

A. Flux

B. Slag

C. Protective layer

D. Binder

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Spherical shape of mercury droplets is due to its

A. High viscosity

B. Low surface tension

C. High density

D. High surface tension