ISRO Mechanical Engg.: Thermodynamics Booster Quiz 4

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Question 1

The enthalphy drop for flow through convergent horizontal nozzles is 100 kJ/kg. If the velocity of approach at inlet to the nozzle is negligible, the exit velocity of the fluid is

• A20 m/s
• B400 m/s
• C447.2 m/s
• D520.8 m/s

Question 2

A reseacher claims that the he has developed an engine, which working between source and sink temperatures of and rejects only 50% of absorbed heat. What will his engine be?

• AAn impossible engine
• BA stirling engine
• CA reversible engine
• DA practical engine

Question 3

If power developed by a turbine in a certain steam power plant is 1200kW. Heat supplied to boiler is 3360 kJ/kg. The heat rejected by the system to cooling water is 2520 kJ/kg. and feed pump work required to condensate back into boiler is 6 kW then the mass rate of flow through the cycle will be

• A1.421 kg/s
• B14.21 kg/s
• C0.1421 kg/s
• D0.01421 kg/s

Question 4

Consider the following:
1). Catalytic converter.
2). Use of high compression ratio.
3). Oxidation catalyst in the exhaust manifold.
4). Use of high degree of supercharger.
By which of these techniques, can the oxides of nitrogen in the engine exhaust be controlled?

• A1 only
• B2 and 4 only
• C2, 3 and 4 only
• D1,2,3 and only

Question 5

Which of the following statements are correct for turbo-prop powered aircraft?
(1). The propulsion efficiency of turbo-prop is higher than that of turbo-jet and rockets for low speeds up to about 800 km/hr.
(2). For the same thrust the turbine in the turbo-prop aircraft is smaller than in the turbo-jet aircraft.
(3). For the turbo-prop the flight velocity cannot exceed the jet velocity.

• A1, 2 and 3
• B1 and 2 only
• C2 and 3 only
• D1 and 3 only

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