361 + Mcqs in Energy Balances Page 6 McqOptions

251.	A mixture contains 40% of A with Heat Capacity 15 J/°C and 60% of B with Heat Capacity 10 J/°C, what is the Heat Capacity of mixture?
A.	11 J/°C
B.	12 J/°C
C.	13 J/°C
D.	14 J/°C
Answer» C. 13 J/°C

Discussion

252.	What are the number of equations associated with 4 process stream, if the number of species in the stream are 2?
A.	4
B.	8
C.	16
D.	24
Answer» D. 24

Discussion

253.	What is the humid heat of a mixture of air (CP = 10 J) with water vapor (CP = 20 J), if the humidity is 25%?
A.	10 J
B.	15 J
C.	20 J
D.	25 J
Answer» C. 20 J

Discussion

254.	Two feeds, F1 with H = 10 J/mole and F2 with H = 25 J/mole, and product 15 moles with H = 15 J/mole, what is the F2?
A.	5 mole
B.	10 mole
C.	15 mole
D.	20 mole
Answer» B. 10 mole

Discussion

255.	What is the sensible heat of a reaction if the enthalpy of outputs is 5 J, and enthalpy of inputs is 10 J?
A.	-5 J
B.	5 J
C.	-10 J
D.	10 J
Answer» B. 5 J

Discussion

256.	What is the heat transferred from 5 mole of the system if the output sensible heat is 1 J/mole, input sensible heat is 3 J/mole, and heat of solution is 4 J/mole?
A.	0
B.	5 J
C.	10 J
D.	20 J
Answer» D. 20 J

Discussion

257.	What is the heat transferred from the system if the output sensible heat is 10 J, input sensible heat is 15 J, and heat of solution is 20 J?
A.	10 J
B.	15 J
C.	20 J
D.	25 J
Answer» C. 20 J

Discussion

258.	What are the number of compositions associated with a process stream, if the number of species in the stream are 4?
A.	1
B.	2
C.	3
D.	4
Answer» D. 4

Discussion

259.	Heat of solution of a mixture is 10 J, what is the heat dissolution?
A.	-10 J
B.	10 J
C.	0
D.	Cannot be determined
Answer» B. 10 J

Discussion

260.	What are the number of variables associated with a process stream, if the number of species in the stream are 2?
A.	1
B.	2
C.	3
D.	4
Answer» E.

Discussion

261.	What is the heat transferred to the system if the enthalpy of the output is 14 J and input is 8 J?
A.	4 J
B.	6 J
C.	8 J
D.	10 J
Answer» C. 8 J

Discussion

262.	Enthalpy of air is 20 J and enthalpy of water vapor is 6 J, if the total enthalpy of the system is 23 J, what is the humidity of the system?
A.	10%
B.	20%
C.	40%
D.	50%
Answer» E.

Discussion

263.	What is the efficiency of a heat engine with heat input 20 J and work output 5 J?
A.	25%
B.	50%
C.	75%
D.	100%
Answer» B. 50%

Discussion

264.	Enthalpy of air is 15 J and enthalpy of water vapor is 20 J, if the total enthalpy of the system is 25 J, what is the humidity of the system?
A.	10%
B.	50%
C.	100%
D.	200%
Answer» C. 100%

Discussion

265.	What is the enthalpy change of 10°C system if the heat capacity of air at 20°C is 5 J/°C and heat capacity of water vapor at 20°C is 15 J/°C, enthalpy of vaporization is 10 J, and the humidity is 40%?
A.	58 J
B.	84 J
C.	114 J
D.	135 J
Answer» D. 135 J

Discussion

266.	Two feeds, 10 moles with H = 10 J/mole and 5 with H = 25 J/mole, what is the enthalpy of products?
A.	5 J/mole
B.	10 J/mole
C.	15 J/mole
D.	20 J/mole
Answer» D. 20 J/mole

Discussion

267.	If Cp of solid benzene is 10 J/°C, what is the enthalpy change of water from 5°C to 75°C?
A.	5 J
B.	10 J
C.	75 J
D.	700 J
Answer» E.

Discussion

268.	What is the vaporization temperature of water at standard conditions?
A.	100°F
B.	212°F
C.	345°F
D.	432°F
Answer» C. 345°F

Discussion

269.	What is the heat transferred from the system if the enthalpy of the output is 25 J and input is 10 J?
A.	5 J
B.	-5 J
C.	15 J
D.	-15 J
Answer» E.

Discussion

270.	What is the enthalpy of a reaction, if the standard heat of formation of compound is 15 J and sensible heat of the compound is 25 J?
A.	15 J
B.	25 J
C.	40 J
D.	50 J
Answer» D. 50 J

Discussion

271.	For an ideal gas isothermal process what is the work done by the gas from 1 m³ to 2 m³ at 300 K?
A.	0.69 kJ
B.	1.24 kJ
C.	1.73 kJ
D.	2.45 kJ
Answer» D. 2.45 kJ

Discussion

272.	What is added to the moist air in the combustion process?
A.	Water
B.	Carbon dioxide
C.	Oxygen
D.	None of the mentioned
Answer» B. Carbon dioxide

Discussion

273.	What is the specific humidity, if mass of water is 10 g and mass of bone dry air is 20 g?
A.	10%
B.	30%
C.	50%
D.	80%
Answer» D. 80%

Discussion

274.	What is the point of saturation of a condensable vapor?
A.	Bubble point
B.	Boiling point
C.	Triple point
D.	Dew point
Answer» E.

Discussion

275.	Which of the following can definitely cause vaporization?
A.	Heating a liquid
B.	Heating a liquid at constant pressure
C.	Cooling a liquid
D.	Cooling a liquid at constant volume
Answer» C. Cooling a liquid

Discussion

276.	Vaporization starts at which point?
A.	Dew point
B.	Bubble point
C.	Triple point
D.	None of the mentioned
Answer» C. Triple point

Discussion

277.	Which of the following represents vaporization?
A.	Change of vapor to liquid
B.	Change of vapor to solid
C.	Change of solid to vapor
D.	Change of liquid to vapor
Answer» E.

Discussion

278.	The feed of a process simulator is 2 mole with enthalpy 4 J/mole, the heat input is 6 J, and the work performed is 10 J, what will be the product enthalpy if mole of the product are 2?
A.	1 J/mole
B.	2 J/mole
C.	3 J/mole
D.	5 J/mole
Answer» C. 3 J/mole

Discussion

279.	The feed of a process simulator is 10 mole with enthalpy 2 J/mole, the heat input is 15 J, and the work performed is 10 J, what will be the product enthalpy if mole of the product are 5?
A.	2 J/mole
B.	3 J/mole
C.	4 J/mole
D.	5 J/mole
Answer» E.

Discussion

280.	The feed of a process simulator is 15 J, the heat input is 8 J, and the work performed is 10 J, what will be the product enthalpy?
A.	-3 J
B.	13 J
C.	15 J
D.	17 J
Answer» C. 15 J

Discussion

281.	Ratio of change in internal energy of a substance from 15°C to T and from T to 10°C is – 2, what is T?
A.	5°C
B.	15°C
C.	20°C
D.	30°C
Answer» B. 15°C

Discussion

282.	Ratio of change in internal energy of a substance from 4°C to T and from T to 10°C is 2, what is T?
A.	5°C
B.	6°C
C.	7°C
D.	8°C
Answer» E.

Discussion

283.	What is the change in internal energy of 1 mole of air ((Cv = 2.1 X 10⁴ J/mole°C), if its temperature changes from 10°C to 5°C?
A.	84 kJ
B.	105 kJ
C.	– 84 kJ
D.	– 105 kJ
Answer» E.

Discussion

284.	What is the change in internal energy of 2 mole of air (Cv = 2.1 X 10⁴ J/mole°C), if its temperature changes from 10°C to 20°C?
A.	420 kJ
B.	540 kJ
C.	840 kJ
D.	1050 kJ
Answer» B. 540 kJ

Discussion

285.	What is the change in internal energy for a process which has final and initial states are exactly similar?
A.	Positive
B.	Negative
C.	Zero
D.	Cannot say
Answer» D. Cannot say

Discussion

286.	A stone has initial potential and kinetic energy as 10 J and 5 J respectively, if the final potential energy of the stone is 15 J what is its final kinetic energy?
A.	0
B.	5 J
C.	10 J
D.	15 J
Answer» B. 5 J

Discussion

287.	A stone is thrown up with a Velocity and comes down, what is the change in kinetic energy of stone?
A.	Positive
B.	Negative
C.	Zero
D.	Cannot say
Answer» D. Cannot say

Discussion

288.	What is the specific kinetic energy of a fluid flowing at rate 0.1 m³/s and 1 m diameter pipe?
A.	0.008 J/Kg
B.	0.016 J/Kg
C.	0.028 J/Kg
D.	0.064 J/Kg
Answer» B. 0.016 J/Kg

Discussion

289.	What is the kinetic energy of an object of mass 2 Kg and Velocity 5 m/s?
A.	20 J
B.	25 J
C.	35 J
D.	50 J
Answer» C. 35 J

Discussion

290.	What is the kinetic energy of an object of mass 10 Kg moving with Velocity 2 m/s?
A.	10 J
B.	20 J
C.	40 J
D.	50 J
Answer» C. 40 J

Discussion

291.	In a 3 stage process Q1 = 10 J, Q2= – 15 J, Q3 = 25 J, if ∆E1 = 15J and ∆E3 = 10 J, what is the work done in second stage, if the total ∆E is 30 J?
A.	5 J
B.	10 J
C.	15 J
D.	20 J
Answer» E.

Discussion

292.	A stone has initial potential, kinetic and internal energy 7 J, 10 J and 2x J respectively, if the final kinetic energy, potential energy and internal energy are 5 J, 21 J and x respectively, what is the final internal energy?
A.	2 J
B.	4 J
C.	5 J
D.	9 J
Answer» E.

Discussion

293.	A stone has initial potential, kinetic and internal energy 4 J, 15 J and 20 J respectively, if the final kinetic energy and potential energy of the stone is 5 J and 10 J respectively, what is the final internal energy?
A.	15 J
B.	20 J
C.	24 J
D.	32 J
Answer» D. 32 J

Discussion

294.	A stone has initial potential and kinetic energy as 5 J and 20 J respectively, if the final kinetic energy of the stone is 15 J what is its final potential energy?
A.	0
B.	10 J
C.	15 J
D.	25 J
Answer» C. 15 J

Discussion

295.	Total energy of the universe is always ______
A.	Increasing
B.	Decreasing
C.	Constant
D.	Cannot say
Answer» D. Cannot say

Discussion

296.	In a 2 stage process Q1 = 5 J, Q2 = 10 J, if the change in internal energy in first stage is 10 J and the total change in internal energy is 20 J, what is the work do done in second stage?
A.	0
B.	5 J
C.	10 J
D.	– 5 J
Answer» B. 5 J

Discussion

297.	2 Kg of steam is enclosed in a container with internal energy = 5 J/Kg, then 5 J of heat is supplied to the system, what is the final internal energy?
A.	7.5 J/ Kg
B.	15 J/Kg
C.	22.5 J/Kg
D.	30 J/Kg
Answer» B. 15 J/Kg

Discussion

298.	5 Kg of steam is enclosed in a container with internal energy = 10 J/Kg, then 25 J of heat is supplied to the system, what is the final internal energy?
A.	5 J/Kg
B.	10 J/Kg
C.	15 J/Kg
D.	20 J/Kg
Answer» C. 15 J/Kg

Discussion

299.	5 J of work is done by the system, if the change in internal energy of the system is 10 J, what is the heat supplied to the system?
A.	– 5 J
B.	5 J
C.	– 15 J
D.	15 J
Answer» E.

Discussion

300.	10 J of heat is supplied and 3 J is taken out, if the change in internal energy of the system is 5 J, what is the work done on the system?
A.	2 J
B.	– 2 J
C.	5 J
D.	– 5 J
Answer» C. 5 J

Discussion

Explore topic-wise MCQs in Chemical Engineering.

A mixture contains 40% of A with Heat Capacity 15 J/°C and 60% of B with Heat Capacity 10 J/°C, what is the Heat Capacity of mixture?

What are the number of equations associated with 4 process stream, if the number of species in the stream are 2?

What is the humid heat of a mixture of air (CP = 10 J) with water vapor (CP = 20 J), if the humidity is 25%?

Two feeds, F1 with H = 10 J/mole and F2 with H = 25 J/mole, and product 15 moles with H = 15 J/mole, what is the F2?

What is the sensible heat of a reaction if the enthalpy of outputs is 5 J, and enthalpy of inputs is 10 J?

What is the heat transferred from 5 mole of the system if the output sensible heat is 1 J/mole, input sensible heat is 3 J/mole, and heat of solution is 4 J/mole?

What is the heat transferred from the system if the output sensible heat is 10 J, input sensible heat is 15 J, and heat of solution is 20 J?

What are the number of compositions associated with a process stream, if the number of species in the stream are 4?

Heat of solution of a mixture is 10 J, what is the heat dissolution?

What are the number of variables associated with a process stream, if the number of species in the stream are 2?

What is the heat transferred to the system if the enthalpy of the output is 14 J and input is 8 J?

Enthalpy of air is 20 J and enthalpy of water vapor is 6 J, if the total enthalpy of the system is 23 J, what is the humidity of the system?

What is the efficiency of a heat engine with heat input 20 J and work output 5 J?

Enthalpy of air is 15 J and enthalpy of water vapor is 20 J, if the total enthalpy of the system is 25 J, what is the humidity of the system?

What is the enthalpy change of 10°C system if the heat capacity of air at 20°C is 5 J/°C and heat capacity of water vapor at 20°C is 15 J/°C, enthalpy of vaporization is 10 J, and the humidity is 40%?

Two feeds, 10 moles with H = 10 J/mole and 5 with H = 25 J/mole, what is the enthalpy of products?

If Cp of solid benzene is 10 J/°C, what is the enthalpy change of water from 5°C to 75°C?

What is the vaporization temperature of water at standard conditions?

What is the heat transferred from the system if the enthalpy of the output is 25 J and input is 10 J?

What is the enthalpy of a reaction, if the standard heat of formation of compound is 15 J and sensible heat of the compound is 25 J?

For an ideal gas isothermal process what is the work done by the gas from 1 m³ to 2 m³ at 300 K?

What is added to the moist air in the combustion process?

What is the specific humidity, if mass of water is 10 g and mass of bone dry air is 20 g?

What is the point of saturation of a condensable vapor?

Which of the following can definitely cause vaporization?

Vaporization starts at which point?

Which of the following represents vaporization?

The feed of a process simulator is 2 mole with enthalpy 4 J/mole, the heat input is 6 J, and the work performed is 10 J, what will be the product enthalpy if mole of the product are 2?

The feed of a process simulator is 10 mole with enthalpy 2 J/mole, the heat input is 15 J, and the work performed is 10 J, what will be the product enthalpy if mole of the product are 5?

The feed of a process simulator is 15 J, the heat input is 8 J, and the work performed is 10 J, what will be the product enthalpy?

Ratio of change in internal energy of a substance from 15°C to T and from T to 10°C is – 2, what is T?

Ratio of change in internal energy of a substance from 4°C to T and from T to 10°C is 2, what is T?

What is the change in internal energy of 1 mole of air ((Cv = 2.1 X 10⁴ J/mole°C), if its temperature changes from 10°C to 5°C?

What is the change in internal energy of 2 mole of air (Cv = 2.1 X 10⁴ J/mole°C), if its temperature changes from 10°C to 20°C?

What is the change in internal energy for a process which has final and initial states are exactly similar?

A stone has initial potential and kinetic energy as 10 J and 5 J respectively, if the final potential energy of the stone is 15 J what is its final kinetic energy?

A stone is thrown up with a Velocity and comes down, what is the change in kinetic energy of stone?

What is the specific kinetic energy of a fluid flowing at rate 0.1 m³/s and 1 m diameter pipe?

What is the kinetic energy of an object of mass 2 Kg and Velocity 5 m/s?

What is the kinetic energy of an object of mass 10 Kg moving with Velocity 2 m/s?

In a 3 stage process Q1 = 10 J, Q2= – 15 J, Q3 = 25 J, if ∆E1 = 15J and ∆E3 = 10 J, what is the work done in second stage, if the total ∆E is 30 J?

A stone has initial potential, kinetic and internal energy 7 J, 10 J and 2x J respectively, if the final kinetic energy, potential energy and internal energy are 5 J, 21 J and x respectively, what is the final internal energy?

A stone has initial potential, kinetic and internal energy 4 J, 15 J and 20 J respectively, if the final kinetic energy and potential energy of the stone is 5 J and 10 J respectively, what is the final internal energy?

A stone has initial potential and kinetic energy as 5 J and 20 J respectively, if the final kinetic energy of the stone is 15 J what is its final potential energy?

Total energy of the universe is always ______

In a 2 stage process Q1 = 5 J, Q2 = 10 J, if the change in internal energy in first stage is 10 J and the total change in internal energy is 20 J, what is the work do done in second stage?

2 Kg of steam is enclosed in a container with internal energy = 5 J/Kg, then 5 J of heat is supplied to the system, what is the final internal energy?

5 Kg of steam is enclosed in a container with internal energy = 10 J/Kg, then 25 J of heat is supplied to the system, what is the final internal energy?

5 J of work is done by the system, if the change in internal energy of the system is 10 J, what is the heat supplied to the system?

10 J of heat is supplied and 3 J is taken out, if the change in internal energy of the system is 5 J, what is the work done on the system?