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4

During sensible heating of humid air

A. Relative humidity increases

B. Dew point remains constant

C. Dry bulb & wet bulb temperature increases

D. Both 'b' & 'c'

Correct Answer :

D. Both 'b' & 'c'


Related Questions

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4

Upto the critical radius of insulation, added insulation, will

A. Increase the heat loss

B. Decrease heat loss and will have no effect beyond that

C. Decrease heat flux

D. Reduce convection heat loss compared to conduction heat less

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4

__________ is used as a material of construction for the blade of power saw.

A. Wrought iron

B. Stainless steel

C. Mild steel

D. High speed steel

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4

The noble metals

A. Are exemplified by Na, K and Li

B. Do not resist corrosion very strongly

C. Are the lowermost in the electro-chemical series of metals

D. None of these

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4

Silicon percentage in silicon steel used for electrical equipments is about

A. 1

B. 4.0

C. 8

D. 14

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4

__________ of test specimens is not involved in any hardness testing method.

A. Fracture

B. Indentation

C. Wear

D. Scratch

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4

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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4

Triple point of water is

A. 0°F

B. 492°R

C. 0°K

D. -273°C

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4

__________ are normally subjected to sub-zero treatment.

A. Highly stressed parts

B. Gauges or precision parts

C. Cold rolled sheets

D. Non machinable materials

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4

__________ furnace is generally used in the non-ferrous foundries.

A. Direct arc

B. Indirect arc

C. Resistance

D. Induction

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4

Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called

A. Tempering

B. Hardening

C. Annealing

D. Normalising

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4

Air-petrol ratio in an automotive petrol engine is around

A. 14 : 1

B. 22 : 1

C. 25 : 1

D. 4 : 1

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4

In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is __________ °C.

A. 20

B. 60

C. 120

D.

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4

__________ is a non volatile film forming constituent of a paint.

A. Thinner

B. Dryer

C. Drying oil

D. None of these

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4

Spheroidising of a material is a/an __________ process.

A. Normalising

B. Annealing

C. Tempering

D. Hardening

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4

Which of the following has the highest modulus of elasticity (about 7 × 106 kg/cm2)?

A. High speed steel

B. Stainless steel

C. Tungsten carbide

D. Superalloys

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4

at 1173E; at equilibrium, what will be the number of moles of CO gas required to reduce one mole of at 1173 K?

A. 1.0

B. 1.3

C. 2.3

D. 3.3

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4

Cementite is in the lamellar form in the __________ phase of steel.

A. Martenistic

B. Bainitic

C. Pearlitic

D. Ferritic

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4

Force between the molecules of the same substance is called __________ force.

A. Adhesive

B. Cohesive

C. Molecular

D. Vander Walls

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4

Starting friction is low in case of the __________ lubrication.

A. Boundary

B. Hydrodynamic

C. Hydrostatic

D. Mixed/semi-fluid

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4

Pick out the wrong statement.

A. Weldability of high carbon steel is poorer compared to low carbon steel

B. Invar is a magnetic alloy

C. Magnetic permeability of the diamagnetic material is less than one

D. Martenistic transformation never goes to completion (i.e., 100%) at room temperature

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4

Natural water contains approximately __________ percent of heavy water.

A. 0.015

B. 0.71

C. 1.2

D. 3.5

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4

Hydrogen can be

A. Used in I.C. engines as fuel

B. Liquefied & stored under cryogenic conditions

C. Produced by electrolysis of water

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

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4

Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are __________ respectively.

A. 70 & 30

B. 30 & 70

C. 50 & 50

D. 90 & 10

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4

Which of the following materials does not form adherent oxide film on surface?

A. Copper

B. Nickel

C. Aluminium

D. Gold & silver

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4

Spark plug is provided in a/an

A. Engine having carburettor

B. Diesel engine

C. Compression ignition engine

D. Both (B) & (C)

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4

Work study deals with the __________ study.

A. Time

B. Motion

C. Both (A) & (B)

D. Neither (A) nor (B)

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4

The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)

A. T

B. 1/T

C. T2

D. 1/T2

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4

In case of compression of one kg of air, the work done will be the least, when the value of polytropic index 'n' is

A. 1

B. 1.4

C. 1.5

D. Y = Cp/Cv

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4

Electrometallurgical methods of metal extraction is normally used for those metals

A. Whose oxide/ore is not reduced by carbon

B. Which fall in the category of alkali & alkaline earth metals

C. Which stands higher in the electrochemical series of the metal

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

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4

In the Bayer's process, bauxite is digested under pressure using

A. H2SO4

B. NaOH

C. NH3

D. HCl