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4

In the diving apparatus, helium is used along with oxygen, because it is

A. Easily available

B. Not soluble in blood at high pressure

C. Lighter than nitrogen

D. Completely miscible with oxygen

Correct Answer :

B. Not soluble in blood at high pressure


Related Questions

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Larger length & diameter water pipes are made by

A. Electrical resistance welding

B. Die casting

C. Semi-centrifugal casting

D. Continuous casting

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4

Sudden fall of atmospheric pressure by a large amount is an indication of the

A. Rain

B. Cold wave

C. Storm

D. Fair weather

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4

Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is

A. Very low which prevents their ignition by compression

B. Very high which prevents their ignition by compression

C. Zero

D. None of these

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4

Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weight

A. 1.5

B. 3

C. 5

D. 7

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Silicon percentage in acid resistant cast iron is about

A. 4

B. 8

C. 14

D. 20

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4

The atmospheric temperature during melting of ice/snow (in the atmosphere)

A. Decreases

B. Increases

C. Remain same

D. May increase or decrease; depends on the altitude where snow melts

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4

Optical activity is a/an __________ property.

A. Additive

B. Constitutive

C. Both (A) & (B)

D. Neither (A) nor (B)

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4

The two elements required to form substitutional solid solution should not have

A. Same crystalline structure

B. Same valency

C. Widely differing electronegativity

D. Same atomic sizes

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4

Density in the solid state is slightly less than that in its liquid state, in case of

A. Carbon dioxide

B. Water

C. Mercury

D. None of these

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Hydrogen in liquid steels is dissolved

A. As tiny gas bubbles

B. In the atomic form

C. In the ionic form

D. In the molecular form

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4

Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other earth moving equipments contain iron, carbon and

A. Manganese

B. Silicon

C. Nickel

D. Chromium

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4

The condition of diffraction from a crystal is given by

A. nλ = 2d Sin θ

B. λ = d Sin 2θ

C. λ = 2d Sin 2θ

D. nλ = d Sin θ

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4

With increase in annealing temperature, the following defect density decreases.

A. Vacancy

B. Dislocation

C. Grain boundary

D. All of these

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Electrolytic reduction cell used for conversion of calcined Al2O3 to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to

A. Achieve very high purity of aluminium (99.9%)

B. Keep the electrolyte in liquid condition by the generation of heat

C. Electrolytically dissociate alumina

D. Both (B) & (C)

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Compressed dry air is used as the cutting fluid, while machining

A. Steel

B. Cast iron

C. Aluminium

D. None of these

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4

Percentage of argon (by volume) in dry atmospheric air is about

A. 0.09

B. 0.3

C. 0.57

D. 0.94

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4

Drills are usually made of

A. Cermets

B. High speed steel

C. Alloy steel

D. Tungsten carbide

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4

Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans?

A. Emissivity of pipe surface

B. Diameter & length of the pipe

C. Temperature of hot pipe surface & that of air in the room

D. None of these

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4

Broaching tools are usually made of

A. Cermets

B. High speed steel

C. Tungsten carbide

D. Stellite

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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

With increase in temperature, the surface tension of water

A. Increases

B. Decreases

C. Remain constant

D. Increases linearly

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4

Brittleness induced due to the presence of sulphur in steel can be reduced by adding

A. Manganese

B. Magnesium

C. Vanadium

D. Copper

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4

As per the Indian boiler regulation (IBR), the type of joint preferred for the circumferential joint is the __________ joint.

A. Butt

B. Lap

C. Welded

D. None of these

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4

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

A. Pressure

B. Elastic

C. Gravity

D. Viscous

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__________ test is the appropriate test to determine whether a material is ductile or brittle.

A. Impact

B. Cupping

C. Hardness

D. Tensile

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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

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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4

As the fluid flow rate increases, the float of the Rotameter

A. Rises in the tube

B. Rotates at higher speed

C. Rotates at lower speed

D. Drops down in the tube

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4

A material subjected __________ must have high resilience.

A. Shock loading

B. Vibration

C. Fatigue

D. Tension

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In chemical dehumidification of air

A. Both specific humidity & dry bulb temperature increases

B. Both specific humidity & dry bulb temperature decreases

C. Specific humidity decreases & dry bulb temperature increases

D. Specific humidity increases & dry bulb temperature decreases