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This set of Engineering Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on Engineering Thermodynamics Set 16
Q1 | Which of the following statement is true?
- open heater is also known as contact-type heater
- in an open type heater the extracted or bled steam is allowed to mix with the feedwater
- in a closed heater, the fluids are not allowed to mix together
- all of the mentioned
Q2 | Which of the following is true for an open heater?
- it is simple, has low cost and low heat transfer capacity
- a pump is required at each heater
- both of the mentioned
- none of the mentioned
Q3 | Deaerator is a type of open heater.
- true
- false
Q4 | Which of the following is true for a closed heater?
- it requires a single pump regardless of the number of heaters
- it is costly
- both of the mentioned
- none of the mentioned
Q5 | The efficiency gain follows the law of diminishing return with the increase in the number of heaters.
- true
- false
Q6 | Which of the following statement is true?
- in some cases, an increase in feedwater temperature may reduce the boiler efficiency
- number of heaters are optimized
- most often, five points of extraction are used
- all of the mentioned
Q7 | The corrected gas equation is given by
- (p+a/(v2))(v+b)=rt
- (p-a/(v2))(v-b)=rt
- (p-a/(v2))(v+b)=rt
- (p+a/(v2))(v-b)=rt
Q8 | Which of the following statement is true about the correction terms?
- the coefficient a was introduced to account for the existence of mutual attraction between the molecules
- the term a/(v2) is called the force of cohesion
- the coefficient b was introduced to account for the volumes of the molecules and is known as co-volume
- all of the mentioned
Q9 | Compressibility factor Z is given by
- rt/pv
- pv/rt
- (rt/pv)2
- (pv/rt)2
Q10 | For an ideal gas, Z has the value
- 0
- 2
- 1
- infinity
Q11 | The magnitude of Z at a particular pressure and temperature indicates the extent of deviation of the gas from the ideal gas behaviour.
- true
- false
Q12 | For the ideal gas equation, what assumptions are made?
- there is little or no attraction between the molecules of the gas
- the volume occupied by the molecules is negligibly small compared to the volume of the gas
- both of the mentioned
- none of the mentioned
Q13 | When does a real gas obey the ideal gas equation closely?
- at high pressure and low temperature
- at low pressure and high temperature
- at low pressure and temperature
- at high pressure and temperature
Q14 | The real gases deviate from the ideal gas equation when the pressure increases.
- true
- false
Q15 | Real gases conform more closely with the van der Waals equation of state than the ideal gas equation of state.
- true
- false
Q16 | What is the pressure of H2 with compressibility 0.6, molar volume 5 liter/mole at 27oC?
- 2.9 atm
- 5.4 atm
- 9.6 atm
- 14.5 atm view answer
Q17 | 3 COMPRESSIBILITY CHART AND ITS USE
- 300.5 k
- 304.5 k
- 310 k d) 312.5 k
- view answer
Q18 | What is the pressure of 80 grams of CH4 with compressibility 5, with 10 liter volume at 27oC?
- 10.5 atm
- 28.9 atm
- 44.2 atm
- 61.5 atm view answer
Q19 | What is the compressibility of neon (molar mass = 20) with density 20 g/liter at 27oC and 100 atm?
- 2.1
- 3.5
- 4 d) 6.8
- view answer
Q20 | 90 g glucose is filled in a container at 10 atm, if the volume of container is 2 liter, what is the temperature of glucose (z = 1.5)?
- 25.4oc
- 51.7oc
- 76.9oc d) 103.5oc
- view answer
Q21 | 9) at 1 atm and 27oC?
- 23.4 liter
- 37.5 liter
- 42.1 liter
- 59.6 liter view answer
Q22 | 39 grams of benzene (z = 1.4) is filled in a container of volume 10 liter at 27oC, what is the pressure of container?
- 1.7 atm
- 1.9 atm
- 2.2 atm
- 2.5 atm view answer
Q23 | Which of the following relation is correct?
- du=tds-pdv
- dh=tds+vdp
- dg=vdp-sdt
- all of the mentioned
Q24 | Maxwell’s equations consists of equations.
- four
- three
- two
- one
Q25 | The first TdS equation is
- tds=cv*dt + t(∂t/∂p)dv
- tds=cv*dt – t(∂p/∂t)dv
- tds=cv*dt + t(∂p/∂t)dv
- tds=cv*dt – t(∂t/∂p)dv