Thermal Engineering(Engineering > Mechanical Engineering ) Questions and Answers
Question 1. The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)
V = 44.72 hdkh_d\sqrt{k}hdk
V = 44.72 khdk\sqrt{h_d}khd
V = 44.72 khd\sqrt{kh_d}khd
V = 44.72 khdkh_dkhd
Explanation:-
Answer: Option C. -> V = 44.72 khd\sqrt{kh_d}khd
Question 2. In an isolated system, ________ can be transferred between the system and its surrounding
Only energy
Only mass
both energy and mass
neither energy nor mass
Explanation:-
Answer: Option D. -> neither energy nor mass
Question 3. The critical pressure gives the velocity of steam at the throat equal to the velocity of sound
Agree
Disagree
Explanation:-
Answer: Option A. -> Agree
Question 4. Heat balance in a boiler furnace is improved by sending air to the furnace
At low temperature
At high temperature
Does not depends on temperature
depends on pressure
Explanation:-
Answer: Option B. -> At high temperature
Question 5. The heat balance sheet for the boiler shows the
complete account of heat supplied by 1 kg of dry fuel and the heat consumed
moisture present in the fuel
steam formed by combustion of hydrogen per kg of fuel
complete combustion of one kg of fuel
Explanation:-
Answer: Option A. -> complete account of heat supplied by 1 kg of dry fuel and the heat consumed
Question 6. The performance of a boiler is NOT measured by the
amount of water evaporated per hour
steam produced in kg/h
steam produced in kg/kg of fuel burnt
complete combustion of one kg of fuel per hour
Explanation:-
Answer: Option D. -> complete combustion of one kg of fuel per hour
Question 7. Which of the following depends on physical properties of fluids as well as geometry of the heat exchanger?
Fouling coefficient
Overall heat transfer coefficient
LMTD (Log Mean Temperature Difference)
Effectiveness
Explanation:-
Answer: Option B. -> Overall heat transfer coefficient
Question 8. Dribbling a basketball is an example of
potential energy
stored energy
temperature
kinetic energy
Explanation:-
Answer: Option D. -> kinetic energy
Question 9. Objects with MORE MASS have______________
lower potential energy
lower number of atoms
higher thermal energy
higher temperature
Explanation:-
Answer: Option C. -> higher thermal energy
Question 10. Bottoming cycle cogeneration is characterized by