03 Chemical Engineering MCQ | Quiz | Practice Tests

1 >>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.

Solution Grashoff number & Prandtl number.

2 >>The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be ?

• (A) parabolic
• (B) hyperbolic
• (C) straight line
• (D) none of these

Solution parabolic

3 >>Energy of the sun arises mainly from __________ reactions. ?

• (A) fusion
• (B) fission
• (C) combustion
• (D) none of these

Solution fusion

4 >>Which of the following fastening devices has a head at one end and a nut fitted to the other ? ?

• (A) Bolt
• (B) Stud
• (C) Top bolt
• (D) None of these

Solution Stud

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

• (A) rain
• (B) cold wave
• (C) storm
• (D) fair weather

Solution storm

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6 >>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.

Solution dry bulb temperature remains constant.

7 >>Secondary hardening in steels arises out of the ?

• (A) precipitation of fine alloy carbides at high temperatures.
• (B) refinement of ferrite grain size by working.
• (C) decomposition of retained austenite upon heat treatment.
• (D) precipitation of complex inter-metal-lics upon heat treatment.

Solution decomposition of retained austenite upon heat treatment.

8 >>Drills are usually made of ?

• (A) cermets
• (B) high speed steel
• (C) alloy steel
• (D) tungsten carbide

Solution high speed steel

9 >>Tumbling is the process of improving the __________ of the materials/parts. ?

• (A) surface finish
• (B) fatigue limit
• (C) creep limit
• (D) surface cleanliness

Solution surface cleanliness

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10 >>The __________ of a double acting reciprocating pump as compared to the single acting pump will be almost double. ?

• (A) flow output
• (B) head developed
• (C) overall efficiency
• (D) weight

Solution flow output

11 >>__________ of air does not increase with increase in temperature. ?

• (A) Density
• (B) Thermal diffusivity
• (C) Viscosity
• (D) Thermal conductivity

Solution Density

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12 >>Spherical shape of mercury droplets is due to its ?

• (A) high viscosity.
• (B) low surface tension.
• (C) high density.
• (D) high surface tension.

Solution high surface tension.

13 >>Sub zero treatment of steel is done to ?

• (A) suppress martensite transformation.
• (B) enhance its working performance in sub zero atmosphere.
• (C) reduce the retained austenite in hardened steel.
• (D) induce temper brittleness after its hardening.

Solution reduce the retained austenite in hardened steel.

14 >>Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner ? ?

• (A) Output & fineness
• (B) Velocity
• (C) Both (a) & (b)
• (D) None of these

Solution Both (a) & (b)

15 >>The most suitable material of construction for a sewer to carry sewage under high pressure is ?

• (A) asbestos cement
• (B) steel
• (C) cement concrete
• (D) stoneware

Solution steel

16 >>Filler material used in welding should have __________ as compared to the parent metal to be welded. ?

• (A) lower melting temperature
• (B) same melting temperature
• (C) same composition
• (D) both 'b' & 'c'

Solution both 'b' & 'c'

17 >>Oxygen cylinders used for autogenous (cutting/welding) purposes are ?

• (A) seamless & made of steel.
• (B) heat treated before use.
• (C) made by sand casting.
• (D) welded steel cylinders.

Solution seamless & made of steel.

18 >>Identify the correct statement. ?

• (A) Sphlerite is zinc oxide.
• (B) The first law of the thermodynamics is stated as ?E = ?Q - ?W.
• (C) Lead can be produced in a blast furnace.
• (D) T. ferrooxidans is a fungus that can be used for leaching chalcopyrite.

Solution Lead can be produced in a blast furnace.

19 >>Dowtherm is a ?

• (A) high temperature heating medium (a petroleum product).
• (B) product of coal tar distillation.
• (C) very heat sensitive material.
• (D) none of these.

Solution high temperature heating medium (a petroleum product).

20 >>To counteract the bad effects of strain hardening on a cold formed part, it must be ?

• (A) tempered
• (B) normalised
• (C) annealed
• (D) hardened

Solution annealed

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