chemical engineering MCQs – Page 422

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 Review each marked answer and report any item that may be outdated or unclear.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

8421. The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 T2)/T1. The co-efficient of performance (C.O.P.) of a Carnot heat pump operating between T1 and T2 is given by__________________?
0

A. T2/(T1-T2)

B. T1/T2

C. T2/R1

D. T1/(T1-T2)

8422. In case of steady flow compression polytropic process (PVn = constant), the work done on air is the lowest, when_______________?
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A. n = y = 1.4

B. n = 1

C. n = 1.66

D. n = 0

8423. 1 torr is equivalent to_________________?
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A. 1 mm wc

B. 1 Pascal

C. 1 atm

D. 1 mm Hg

8424. What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T1 and T2 are source & surrounding temperatures respectively.) ?
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A. TR/(T2 TR) (T1 T2)/T1

B. TR/(T2 TR) T1/(T1 T2)

C. None of these

D. TR/(T1 TR) (T1 T2)/T1

8425. Heat requirement for decomposition of a compound into its elements is _____________ that is evolved during the formation of that compound from its elements?
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A. Less than

B. Greater than

C. Different than

D. The same

8426. _______________ increases with increase in pressure?
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A. The melting point of wax

B. The boiling point of a liquid

C. Both A. and B

D. Neither A. nor B

8427. COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about____________________?
0

A. 3.5

B. 4.5

C. 0.5

D. 8.5

8428. A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect ?
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A. Carnot refrigeration cycle

B. Vapor compression cycle using expansion valve

C. Air refrigeration cycle

D. Vapor compression cycle using expansion engine

8429. The following heat engine produces power of 100,000 kW. The heat engine operates between 800 K and 300 K. It has a thermal efficiency equal to 50% of that of the Carnot engine for the same temperature. The rate at which heat is absorbed from the hot reservoir is____________________?
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A. 320,000 kW

B. 160,000 kW

C. 200,000 kW

D. 100,000 kW

8430. In the reaction, H2 +I2 ? 2HI, addition of an inert gas will___________________?
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A. Increase the partial pressure of I2

B. Increase the total pressure and hence shift the equilibrium towards the right

C. Increase the partial pressure of H2

D. Not affect the equilibrium conditions

8431. A/an ____________ system is exemplified by a vessel containing a volatile liquid in contact with its vapor?
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A. Isolated

B. Open

C. None of these

D. Closed

8432. Which of the following is a widely used refrigerant in vapour compression refrigeration system (using large centrifugal compressor) ?
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A. Liquid sulphur dioxide

B. Methyl chloride

C. Freon

D. Ammonia

8433. The value of gas constant R is__________________?
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A. 1.987 cal/gm mole K

B. 1.987 BTU/lb. mole R

C. Both A. and B

D. Neither A. nor B

8434. The equation Tds = dE PdV applies to___________________?
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A. Single phase fluid of varying composition

B. Single phase fluid of constant composition

C. Open as well as closed systems

D. Both B. and C

8435. Which of the following is not correct for a reversible adiabatic process ?
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A. PV? = constant

B. None of these

C. TV?-1 = constant

D. p1-?.TY = constant

8436. If we increase the pressure on a substance (which is at its triple point), then the triple point __________________?
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A. Decreases

B. Remains unchanged

C. Increases

D. May increase or decrease; depends on the substance

8437. Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because_________________?
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A. The salt formed does not hydrolyse

B. The strong base and strong acid reacts completely

C. The strong base and strong acid reacts in aqueous solution

D. Only OH- and H+ ions react in every case

8438. The unit of equilibrium constant of a chemical reaction is the same as that of__________________?
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A. Molar concentration

B. None of these

C. Internal energy

D. Temperature

8439. Boiling of liquid is accompanied with increase in the__________________?
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A. All (A), B. and (C)

B. Specific Gibbs free energy

C. Specific entropy

D. Vapor pressure

8440. ________________ decreases during adiabatic throttling of a perfect gas?
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A. Entropy

B. Pressure

C. Enthalpy

D. Temperature

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