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- Question
The thermal efficiency of a reversible heat engine operating between two given thermal reservoirs is 0.4. The device is used either as a refrigerator or as a heat pump between the same reservoirs. Then the coefficient of performance as a refrigerator (COP)R and the co-efficient of performance as a heat pump (COP)HP are
Options- A. (COP)R = (COP)HP = 0.6
- B. (COP)R = 2.5; (COP)HP = 1.5
- C. (COP)R = 1.5; (COP)HP = 2.5
- D. (COP)R = (COP)HP = 2.5
- Correct Answer
- (COP)R = 1.5; (COP)HP = 2.5
- 1. In which of the following furnaces, the gases are sucked through the stock bed from below?
Options- A. Soaking pit
- B. Sintering machine
- C. Beehive oven
- D. None of these Discuss
- 2. In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the
Options- A. rate of firing and emissivity of flame.
- B. thermal conductivity of the charge & structural materials of furnace.
- C. nature of process ; whether batch, continuous or intermittant.
- D. all (a), (b) and (c) Discuss
- 3. Fenske equation determines the
Options- A. maximum number of ideal plates.
- B. height of the distillation column.
- C. minimum number of theoretical plates.
- D. optimum reflux ratio. Discuss
- 4. Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effect in evaporation
Options- A. increases capacity.
- B. increases economy.
- C. does not affect the capacity.
- D. both 'b' & 'c'. Discuss
- 5. The half life period of a radiactive element is 100 days. After 400 days, one gm of the element will be reduced to __________ gm.
Options- A. 1/4
- B. 1/8
- C. 1/2
- D. 1/16 Discuss
- 6. 'Light water' used as a coolant in nuclear reactor is nothing but
Options- A. ordinary water.
- B. mildly acidic (pH = 6) water.
- C. mildly alkaline (pH = 8) water.
- D. none of these. Discuss
- 7. In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds.
Options- A. 2.5
- B. 5
- C. 12.5
- D. 17.5 Discuss
- 8. Normally, the ratio of the total riser area to the tower cross sectional area (for bubble cap towers of diameter more than 3 ft) is around
Options- A. 0.4-0.6
- B. 0.35-0.75
- C. 0.1-0.2
- D. 0.55-0.85 Discuss
- 9. With increase in the solute concentration, the specific heat of aqueous solutions
Options- A. increases
- B. decreases
- C. remains unchanged
- D. either (a) or (b); depends on the type of solution Discuss
- 10. A cylinderical pressure vessel of volume 6 ?m3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to
Options- A. 5 mm
- B. 6 mm
- C. 8 mm
- D. 10 mm Discuss
More questions
Correct Answer: Sintering machine
Correct Answer: all (a), (b) and (c)
Correct Answer: minimum number of theoretical plates.
Correct Answer: both 'b' & 'c'.
Correct Answer: 1/16
Correct Answer: ordinary water.
Correct Answer: 5
Correct Answer: 0.1-0.2
Correct Answer: decreases
Correct Answer: 10 mm
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