Thermal Engineering II Set 19

Mechanical Engineering

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This set of Thermal Engineering 2 Multiple Choice Questions & Answers (MCQs) focuses on Thermal Engineering II Set 19

Q1 | A turbine having alternate blades and nozzles is called as                                
  • impulse turbine
  • reaction turbine
  • impulse & reaction turbine
  • none of the mentioned
Answer: impulse turbine
Q2 | Multi stage arrangement of turbines is called as                      
  • impulse turbine
  • reaction turbine
  • compounding
  • none of the mentioned
Answer: compounding
Q3 | Compounding                      efficiency at low speed.
  • decrease
  • increase
  • maximizes
  • none of the mentioned
Answer: increase
Q4 | In pressure compounded turbines moving nozzles are followed by turbine blades.
  • true
  • false
Answer: false
Q5 | In pressure compounded turbines flow passage is from                              
  • moving nozzles to fixed blades
  • fixed nozzles to moving blades
  • fixed blades to moving nozzles
  • none of the mentioned
Answer: fixed nozzles to moving blades
Q6 | In velocity compounded turbines flow passage is from                          
  • moving blades to fixed nozzles
  • fixed nozzles to moving blades
  • fixed blades to moving nozzles
  • none of the mentioned
Answer: none of the mentioned
Q7 | Reaction turbine is also called as
  • impulse turbine
  • curtis wheel
  • parsons turbine
  • none of the mentioned
Answer: parsons turbine
Q8 | A turbine comprising of fixed blades and moving nozzles is called as reaction turbines.
  • true
  • false
Answer: true
Q9 | A plant producing both, electrical power & process heat simultaneously is?
  • cogenital plant
  • cogenerial plant
  • cogeneration plant
  • conglomerate plant
Answer: cogeneration plant
Q10 | In a by-product power cycle?
  • the power is produced initially
  • power production is in the middle stages of the cycle
  • power production is after the cycle has ended
  • none of the mentioned
Answer: power production is after the cycle has ended
Q11 | In terms of cost per MW compared to condensing sets of the same power, the back pressure turbines are?
  • more expensive
  • cheaper
  • costly
  • none of the mentioned
Answer: cheaper
Q12 | Which of the following is a good medium for constant temperature heating?
  • water
  • steam
  • coolant
  • diesel
Answer: steam
Q13 | The cogeneration plant efficiency nCO if WT, Qi, QH represents turbine work, heat input, heat output respectively is given by?
  • nco = (wt + qi) / qh
  • nco = (wt – qi) / qh
  • nco = (wt + qh) / qi
Answer: nco = (wt + qh) / qi
Q14 | If e is the electricity fraction of the total energy output, m is the electric plant efficiency and n is the steam generator efficiency; the heat added per unit total energy output is given by?
  • (1 / m) + ((1 – e) / n)
  • (1 / n) + ((1 – e) / m)
  • (1 / m) + ((1 + e) / n)
  • (1 / n) + ((1 – e) / m)
Answer: (1 / m) + ((1 – e) / n)
Q15 | Pass-out turbines are used in which of these cases?
  • relatively high back pressure
  • small heating requirement
  • only relatively low back pressure
  • both relatively high back pressure and small heating requirement
Answer: both relatively high back pressure and small heating requirement
Q16 | Which of these is not considered economical for cogeneration?
  • a high fraction of electric to total energy
  • a low fraction of electric to total energy
  • a low fraction of total energy to electric energy
  • none of the mentioned
Answer: a low fraction of electric to total energy
Q17 | Heat exchangers are classified into how many categories?
  • 1
  • 2
  • 3
  • 4
Answer: 4
Q18 | Based upon the nature of heat exchange process, the heat exchangers are classified into how many categories
  • 1
  • 2
  • 3
  • 4
Answer: 3
Q19 | The energy transfer between the hot fluid and cold fluids is brought about by their complete physical mixing in
  • direct contact heat exchanger
  • regenerators
  • recuperators
  • boilers
Answer: direct contact heat exchanger
Q20 | Which type of flow arrangement is this?
  • counter flow
  • parallel flow
  • regenerator
  • shell and tube
Answer: parallel flow
Q21 | Which of the following is not an example of recuperators type heat exchanger?
  • automobile radiators
  • condensers
  • chemical factories
  • oil heaters for an aero plane
Answer: chemical factories
Q22 | In how many categories heat exchangers are classified on the basis of direction of flow of fluids?
  • 4 categories
  • 3 categories
  • 2 categories
  • 1 categories
Answer: 3 categories
Q23 | In how many categories heat exchangers are classified on the basis of physical state of heat exchanging fluids?
  • 1
  • 2
  • 3
  • 4
Answer: 2
Q24 | In vapour refrigeration cycle, which of the following is used for expansion?
  • expansion engine
  • throttling valve or capillary tube
  • both of the mentioned
  • none of the mentioned
Answer: throttling valve or capillary tube
Q25 | Which of the following operations occur in a vapour refrigeration cycle?
  • compression
  • cooling and condensing
  • expansion and evaporation
  • all of the mentioned
Answer: all of the mentioned
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