Practice topic-wise Power Plant Engineering previous year questions for ISRO Mechanical & Aerospace with instant step-by-step solutions and formula breakdowns.
All ISRO Mechanical & Aerospace papers
4 questions.
Year: 2008 | Topic: Power Plant Engineering
Heavy water is used in atomic power plants as
Answer: D. Moderator
Explanation: Heavy water is used in atomic power plants as a moderator to slow down neutrons.
Year: 2016 | Topic: Power Plant Engineering
A steam thermal power plant works on
Answer: B. Rankine cycle
Explanation: Steam thermal power plants operate on the Rankine cycle, which is the fundamental thermodynamic cycle for steam engines and steam turbines. In contrast, gas turbine power plants work on the Brayton cycle.
Year: 2016 | Topic: Power Plant Engineering
A simple steam power cycle receives 1,00,000 kJ/min as heat transfer from hot combustion gases and rejects 66,000 kJ/min as heat transfer to the environment. If the pump power required is 1400 kJ/min the thermal efficiency of the cycle and turbine power output is
Answer: B. 34% and 590 kW
Explanation: The heat supplied is $Q_S = 1,00,000$ kJ/min and heat rejected is $Q_R = 66,000$ kJ/min. Thermal efficiency is $\eta_{th} = 1 - (Q_R / Q_S) = 1 - (66000 / 100000) = 0.34 = 34\%$. The net work output is $W_{net} = Q_S - Q_R = 34,000$ kJ/min. Since $W_{net} = W_{turbine} - W_{pump}$, we have $W_{turbine} = W_{net} + W_{pump} = 34,000 + 1,400 = 35,400$ kJ/min. Converting this to kW: $35,400 / 60 = 590$ kW.
Year: 2026 | Topic: Rocket Propulsion
A pintle injector primarily helps in:
Answer: A. Controlling flow rate and atomization for mixing propellants
Explanation: Pintle injectors provide good throttling and mixing characteristics by controlling jet geometry.