Power Plants
JKSSB Junior Engineer (Mechanical) · Thermal Engineering and Refrigeration & Air-conditioning · 21 practice questions with answers and explanations: 8 Easy, 13 Medium, 0 Hard.
Sample questions
Sample Easy question 1
Which of these is a water-tube boiler?
- Cochran boiler
- Lancashire boiler
- Locomotive boiler
- Babcock and Wilcox boiler
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Answer: D. Water flows inside the tubes and hot gases pass outside.
Sample Easy question 2
A steam turbine converts:
- water into fuel
- mechanical work into heat
- the energy of steam into mechanical work
- electrical energy into steam
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Answer: C. Expansion of steam turns the rotor to produce shaft work.
Sample Easy question 3
The boiler mounting that prevents the steam pressure from exceeding a safe limit is the:
- safety valve
- stop valve
- feed check valve
- water gauge
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Answer: A. It opens automatically when the pressure rises too high.
Sample Medium question 4
In an ideal Rankine cycle, the process in the condenser takes place at constant:
- pressure
- volume
- entropy
- enthalpy
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Answer: A. Heat is rejected at constant pressure (and temperature for wet steam).
Sample Medium question 5
Regenerative feed heating in a steam power plant improves efficiency by:
- increasing the condenser pressure
- reducing the turbine work
- lowering the boiler pressure
- raising the average temperature at which heat is added
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Answer: D. Bled steam preheats the feed water.
Sample Medium question 6
A steam turbine in which the whole of the pressure drop takes place in the nozzles is an:
- gas turbine
- reaction turbine
- mixed pressure turbine
- impulse turbine
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Answer: D. The steam jets strike the moving blades at constant pressure.