chemical engineering Mcqs
6803. Presence of nitrogen in steel___________________?
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A. Increases its hardness

B. Increases its strength

C. Is desirable

D. Makes it brittle
6804. Transition from laminar flow to turbulent flow is aided by the__________________?
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A. Pressure gradient and the compressibility of the flowing medium

B. All A., B. & C.

C. Surface roughness and curvature (i.e. sharp corners)

D. Vibration

6805. Sound waves propagation in air exemplifies an ______________ process?
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A. None of these

B. Adiabatic

C. Isothermal

D. Isometric

6806. In the reaction; N2 + O2 ? 2NO, increasing the pressure will result in_________________?
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A. Shifting the equilibrium towards right

B. Shifting the equilibrium towards left

C. None of these

D. No change in equilibrium condition
6808. Which of the following is the most widely used insulating material for steam carrying pipelines ?
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A. Vermiculite

B. Glass wool and 85% magnesia

C. Slag wool

D. Ceramic fibre blanket

6811. Multistage centrifugal pumps are generally used for________________?
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A. High head

B. Low head but high discharge

C. Slurries of high solid concentration

D. Highly viscous liquid

6814. The friction factor for turbulent flow in a hydraulically smooth pipe______________?
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A. Depends on the roughness

B. None of these

C. Depends only on Reynolds number

D. Does not depend on Reynolds number

6818. Aqueous nitric acid is stored in ______________ vessel?
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A. Plain carbon steel

B. Stainless steel

C. Thermosetting plastic material

D. Cast iron
6820. Chilled iron castings are__________________?
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A. Easily machinable

B. None of these

C. Soft on surface

D. Highly wear resistant
6821. Which one has the maximum tensile strength out of the following ?
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A. Pig iron

B. Grey cast iron

C. White cast iron

D. Nodular cast iron
6824. Which is the purest form of iron ?
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A. Grey iron

B. Bessemer iron

C. Wrought iron

D. Pig iron

6825. Monel metal is an alloy of__________________?
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A. Molybdenum and zinc

B. Molybdenum and aluminium

C. Molybdenum and nickel

D. Nickel and copper
6828. Rotary kilns in cement industry are lined with _____________bricks?
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A. Lead

B. Silica

C. High alumina & high magnesia

D. Fireclay

6830. Polymorphism is not exhibited by______________________?
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A. Phosphorous

B. None of these

C. Carbon

D. Iron

6831. Which of the following is an undesirable property of a manometric liquid ?
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A. Low viscosity & surface tension

B. Non-sticky & non-corrosive nature

C. High vapour pressure

D. Low co-efficient of thermal expansion

6832. Foot valve provided in the pump is a ______________ valve?
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A. Relief

B. Back pressure

C. Direction control

D. Pressure reduction

6834. Maximum consumption of lead is in the manufacture of _________________________?
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A. Storage batteries

B. Electric cable sheathing

C. Lead lined vessels

D. Solder alloys

6836. Capillary tube method of viscosity measurement is based on the ________________?
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A. Navier-stokes equation

B. Hagen-Poiseuilles equation

C. None of these

D. Stokes law

6837. Turbine impeller____________________?
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A. Is effective over wide range of viscosities

B. Does not produce tangential current

C. Produces only tangential current

D. Produces only radial current

6838. Inconel is an alloy of_________________?
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A. Copper and nickel

B. Copper and tin

C. Iron, nickel and chromium

D. Tin, zinc and nickel

6839. Venturimeter and orificemeter measures the _____________ of the fluid?
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A. Average velocity

B. Point velocity

C. Maximum velocity

D. Pressure

6840. Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump ?
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A. Either of A., B. or C.

B. Increasing the number of vanes in the impeller

C. Increasing the impeller speed and the volute area

D. Mounting of two or more impellers in series on a single shaft
6843. Combination of metals and ceramics are called___________________?
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A. Metalloy

B. Non-crystalline ceramics

C. Cermets

D. Pellets

6844. Condenser tubes are not made of_________________?
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A. Aluminium brass alloy

B. Muntz brass

C. Cartridge brass

D. Wood metal
6845. Wrought iron is a suitable material of construction for handling _____________ solutions?
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A. None of these

B. Alkalis & alkaline

C. Concentrated acidic

D. Dilute acidic

6847. High speed steel should have high___________________?
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A. Toughness

B. Wear resistance

C. Hardenability

D. Both B. & C.
6848. Bell metal is an alloy of __________________?
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A. Zinc & tin

B. Copper & nickel

C. Copper & tin

D. Copper & zinc

6849. The simple Pitot tube does not measure the________________?
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A. Static pressure

B. All A., B. and C.

C. Dynamic pressure

D. Velocity at the stagnation point

6850. For a reciprocating pump, the indicator diagram is the graph between the________________?
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A. Discharge and overall efficiency

B. None of these

C. Angle swept by the crank pin at any instant and the discharge

D. Volume swept by piston for one complete revolution and the pressure in the cylinder