Chemical Engineering Thermodynamics

91. Co-efficient of Performance (COP) of a refrigerator is the ratio of the

1. Work required to refrigeration obtained
2. Refrigeration obtained to the work required
3. Lower to higher temperature
4. Higher to lower temperature

View answer

92. Co-efficient of performance for a reversed Carnot cycle working between temperatures T₁ and T₂ (T₁ > T₂) is

1. T₂/(T₁ - T₂)
2. T₁/(T₁ - T₂)
3. (T₁ - T₂)/T₁
4. (T₁ - T₂)/T₂

View answer

93. Compound having large heat of formation is

1. More stable
2. Less stable
3. Not at all stable (like nascent O₂)
4. Either more or less stable; depends on the compound

View answer

94. Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are

1. Always greater than one
2. Same at the same reduced temperature
3. Same at the same reduced pressure
4. Both (B) & (C)

View answer

95. Compressibility factor for almost all the gases are approximately same at the same

1. Pressure and temperature
2. Reduced pressure and reduced temperature
3. Critical pressure and critical temperature
4. None of these

View answer

96. Compressibility factor of a gas is

1. Not a function of its pressure
2. Not a function of its nature
3. Not a function of its temperature
4. Unity, if it follows PV = nRT

View answer

97. Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates

1. Use of only one graph for all gases
2. Covering of wide range
3. Easier plotting
4. More accurate plotting

View answer

98. Consider the reaction, C + O₂ ⇌ CO₂; ΔH = - 94 kcal. What will be the value of ΔH for the reaction CO₂ → C + O₂?

1. -94 kcal
2. +94 kcal
3. > 94 kcal
4. < -94 kcal

View answer

99. COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about

1. 0.5
2. 3.5
3. 4.5
4. 8.5

View answer

100. Cp - Cv = R is valid for _________ gases.

1. Ideal
2. Very high pressure
3. Very low temperature
4. All of the above

View answer