Chemical Engineering Basics

331. In a neutral solution

  1. H+ ions are absent
  2. OH- ions are absent
  3. Both H+ and OH- ions are present in very small but equal concentration
  4. None of these

Correct answer: (C)
Both H+ and OH- ions are present in very small but equal concentration

332. In a totally irreversible isothermal expansion process for an ideal gas, δE = 0, δH = 0. Then δQ and δS will be

  1. Δ;Q = 0, ΔS=0
  2. ΔQ = 0, ΔS = +ve
  3. ΔQ = 0, ΔS = -ve
  4. ΔQ = +ve, ΔS= +ve

Correct answer: (B)
ΔQ = 0, ΔS = +ve

333. In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material?

  1. Tin
  2. Lead
  3. Zinc
  4. Glass

Correct answer: (D)
Glass

334. In an eutectic system, two elements are completely

  1. Soluble in solid state
  2. Insoluble in liquid state
  3. Insoluble in both solid & liquid state
  4. Soluble in liquid state

Correct answer: (D)
Soluble in liquid state

335. In case of a, centrifugal pump, the ratio h1/h2 is termed as the __________ efficiency (where, h1 = actual measured head & h2 = head imparted to the fluid by impeller).

  1. Mechanical
  2. Overall
  3. Volumetric
  4. Impeller

Correct answer: (A)
Mechanical

336. In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________ increases.

  1. Percentage elongation
  2. Brinell hardness
  3. Tensile strength
  4. All 'a', 'b' & 'c'

Correct answer: (A)
Percentage elongation

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

  1. 1
  2. 1.4
  3. 1.5
  4. Y = Cp/Cv

Correct answer: (A)
1

338. In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is

  1. More
  2. Less
  3. Equal
  4. Much more

Correct answer: (C)
Equal

339. In case of simple harmonic motion, displacement is proportional to the

  1. Velocity
  2. Acceleration
  3. Both (A) & (B)
  4. Neither (A) nor (B)

Correct answer: (B)
Acceleration

340. In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is

  1. Less
  2. More
  3. Equal
  4. Unpredictable

Correct answer: (A)
Less

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