chemical engineering MCQs – Page 416

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 Review each marked answer and report any item that may be outdated or unclear.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

8301. A system is said to be isopiestic, if there is no ______________ change?
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A. Volume

B. Temperature

C. None of these

D. Pressure

8302. The change in Gibbs free energy for vaporisation of a pure substance is___________________?
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A. Positive

B. May be positive or negative

C. Negative

D. Zero

8303. What happens in a reversible adiabatic expansion process ?
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A. Pressure is constant

B. Cooling takes place

C. Heating takes place

D. Temperature is constant

8304. If the pressure of a gas is reduced to half & its absolute temperature is doubled, then the volume of the gas will_________________?
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A. Be reduced to 1/4th

B. Increase four times

C. None of these

D. Increase two times

8305. Entropy change in case of reversible adiabatic process is________________?
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A. Minimum

B. Indeterminate

C. Zero

D. Maximum

8306. In an isothermal process on an ideal gas, the pressure increases by 0.5 percent. The volume decreases by about _____________ percent?
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A. 1

B. 0.5

C. 0.25

D. 0.75

8307. The first law of thermodynamics is a restatement of the law of conservation of_________________?
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A. Mass

B. Momentum

C. None of these

D. Energy

8308. For an ideal solution, the value of activity co-efficient is______________________?
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A. 0

B. 1

C. 1

8309. The partial pressure of each constituent present in an alloy is _____________ the total vapor pressure exerted by the alloy?
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A. More than

B. Either B. or C; depends on the type of alloy

C. Less than

D. Equal to

8310. Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in__________________?
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A. Decreased COP

B. Same COP

C. Increased or decreased COP; depending upon the type of refrigerant

D. Increased COP

8311. At absolute zero temperature, the _____________ of the gas is zero?
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A. Volume

B. Pressure

C. Mass

D. None of these

8312. After throttling, gas temperature___________________?
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A. Increases

B. May increase or decrease; depends on the nature of the gas

C. Remain same

D. Decreases

8313. In a P-V diagram (for an ideal gas), an isothermal curve will coincide within adiabatic curve (through a point), when___________________?
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A. Cp < Cv

B. Cp > Cv

C. Cp = Cv

D. C ? Cv

8314. Mollier diagram is a plot of___________________?
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A. Temperature vs. enthalpy

B. Temperature vs. internal energy

C. Entropy vs. enthalpy

D. Temperature vs. enthalpy

8315. For a constant volume process_________________?
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A. dE = CvdT

B. dQ = dE + pdV

C. dW = pdV

D. dE = CpdT

8316. With increase in temperature, the atomic heat capacities of all solid elements_________________?
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A. Increases

B. Decreases

C. Decreases linearly

D. Remains unchanged

8317. When pressure is applied on the system, ice ? water, then_________________?
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A. More water will be formed

B. Evaporation of water will take place

C. More ice will be formed

D. Equilibrium cannot be established

8318. Isotherm on an enthalpy-concentration diagram, for an ideal solution will be a __________________?
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A. Straight line

B. Parabola

C. Hyperbola

D. Sine curve

8319. For an ideal gas, the internal energy depends upon its ____________ only?
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A. Volume

B. Pressure

C. Molecular size

D. Temperature

8320. _______________ functions are exemplified by heat and work ?
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A. Path

B. Point

C. None of these

D. State

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