chemical engineering MCQs – Page 373

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs

7441. The heating capacity of muffle furnace depends on the____________________?
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A. Surface area & emissivity of the stock

B. Properties of the muffle wall (temperature, area, and emissivity)

C. Both A. & B.

D. Neither A. nor B.

7442. Pick out the wrong statement ?
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A. Refractories used in muffle furnace should have low thermal conductivity

B. For reducing spalling tendency, the refractory should be well fired and its porosity should be

C. Refractoriness under load (RUL) of a refractory is always less than its refractoriness

D. The electrical resistivity of refractories drops rapidly with rise in temperature

E. e

7443. Zinc is highly ______________ at room temperature?
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A. Resistant to atmospheric corrosion

B. Brittle

C. Ductile

D. Malleable

7444. A suitable material of construction to use with fuming sulphuric acid is_________________?
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A. Carbon steel

B. Stainless steel type 304

C. Monel

D. Nickel

7445. Pick out the wrong statement ?
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A. ocity at a point

B. A hydrometer used for the determination of specific gravities of liquids works on the principle

C. buoyant forces

D. In case of unsteady fluid flow, the velocity at any given point does not change with time

E. Surface tension of a liquid is because of the difference in magnitude of adhesive & cohesive

F. Turbulent fluid flow is characterised by the rapid fluctuation of instantaneous pressure &

7446. Pick out the wrong statement about a streamline ?
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A. eamline spacing varies inversely as the velocity

B. It is a line across which there is no flow and it is equivalent to a rigid boundary

C. The fluid lying between any two streamlines can be considered to be in isolation and the

D. It is always parallel to the main direction of the fluid flow

E. Streamlines intersect at isolated point of zero velocity and infinite velocity

7447. The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about ____________ percent?
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A. 85

B. 70

C. 15

D. 40

7448. Unit of furnace loading is____________________?
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A. Ton stock/hr/m2 hearth area

B. Ton stock/hr

C. Ton stock/m2 hearth area

D. Both B. and C.

7449. Which of the following is not an alloy of nickel and chromium ?
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A. Inconel

B. Duralumin

C. Hastelloy

D. Nimonic alloys

7450. Which one is remelted and poured into moulds to get cast iron ?
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A. Wrought iron

B. Mild steel

C. Pig iron

D. Low carbon steel

7451. Which is a regenerative furnace ?
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A. Coke oven heating chamber

B. Open hearth furnace

C. Both A. and B.

D. Neither A. nor B.

7452. Power required in case of forced draught as compared to induced draught (for the same draught produced) is___________________?
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A. Same

B. Less

C. Either more or less; depends on the flue gas density

D. More

7453. Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of_________________?
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A. Beryllium

B. Thoria

C. Zircon powder

D. Graphite powder

7454. Main gas valve in a gaseous fuel burner is a ______________ valve?
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A. Butterfly

B. Globe

C. None of these

D. Gate

7455. Aluminium as a material of construction suffers from the disadvantage of__________________?
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A. Rather low tensile strength

B. Very high cost

C. Very low strength to weight ratio

D. Scarce availability

7456. The most commonly used resin for making reinforced plastic is___________________?
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A. Polypropylene

B. Polyurethane

C. Nylon-6

D. Unsaturated polyester

7457. Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing ?
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A. Excessive fly ash discharge from the stack

B. Erosion of induced draft fan blades

C. Ash disposal problem

D. Higher power consumption in its transportation

7458. Pick out the wrong statement ?
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A. Atmospheric pressure = absolute pressure ? gage pressure

B. Pressure decreases exponentially with elevation in an isothermal atmosphere

C. ections

D. As per Pascals law, the pressure at a point in a static or uniformly moving fluid is equal in all

E. In a static mass of liquid, the pressure at a point is the same for all liquids

7459. Aluminium storage vessel can be used to store________________?
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A. Hydrochloric acid (10%)

B. Ferrous sulphate

C. None of these

D. Aqua regia

7460. If fuel and air are mixed ahead of the burner, it is called a/an ______________ burner?
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A. Diffusion

B. Outside mixing type

C. Rotary

D. Premix

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