Chemical Engineering Basics

321. If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity

  1. Is trebled
  2. Remains unchanged
  3. Decreases by a factor of 3
  4. Decreases by a factor of 1/3

Correct answer: (B)
Remains unchanged

322. If the head is doubled in & centrifugal pump, the power required will increase in the ratio of

  1. 23
  2. 23/2
  3. 25/2
  4. 21/3

Correct answer: (B)
23/2

323. In "Imperial Smelting Process" for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following:

  1. Jet of water at high pressure
  2. Blast of air
  3. Mixture of water and air
  4. Rain of molten lead

Correct answer: (D)
Rain of molten lead

324. In __________ process, there is an increase in entropy with no degradation of energy.

  1. Isothermal expansion
  2. Isochoric heat addition
  3. Polytropic expansion
  4. Isobaric heat addition

Correct answer: (A)
Isothermal expansion

325. In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness in this case will

  1. Decrease gradually
  2. Increase gradually
  3. Increase rapidly
  4. Remain constant

Correct answer: (B)
Increase gradually

326. In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is __________ °C.

  1. 20
  2. 60
  3. 120
  4. ∞

Correct answer: (D)
∞

327. In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of

  1. Stainless steel
  2. Mild steel
  3. High speed steel
  4. High carbon steel

Correct answer: (C)
High speed steel

328. In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the

  1. Range is 15°F
  2. Approach is 10°F
  3. Both (A) & (B)
  4. Neither (A) nor (B)

Correct answer: (C)
Both (A) & (B)

329. In a furnace with heating element temperature at 1700°C, the dominant mechanism of heat transfer will be

  1. Conduction
  2. Radiation
  3. Natural convection
  4. Forced convection

Correct answer: (B)
Radiation

330. In a good rimming steel

  1. Carbon and silicon should be low
  2. Silicon should be low but carbon should be high
  3. Both silicon & carbon should be high
  4. Silicon should be high but carbon should be low

Correct answer: (A)
Carbon and silicon should be low

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