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ISRO 2018 Thermodynamics Booster Quiz 1

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Question 1

The sound of explosion on a ship located 10 km away from the beach was heard 28.6 second after the explosion was seen. Estimate the temperature of air at that time.

Question 2

Water is boiled at 1×105 Pa pressure in a coffee maker equipped with an immersion-type electric heating element. The coffee maker initially contains 1 kg of water. Once boiling started, it is observed that half of the water in the coffee maker evaporated in 18 minutes. If the heat loss from the coffee maker is negligible, the power rating of the heating element is

Question 3

A large diesel engine runs on a 4 stroke cycle at 2000 rpm. The engine has a displacement of 25 litre and a brake mean effective pressure of 0.6 MN/m2. It consumes 0.018 Kg/s of fuel (calorific value = 42000 kJ/Kg).
Determine the brake power.

Question 4

The amount of steam (at 100 °C) required to raise the temperature of 200 g of water from 60 °C to 100 °C is (latent heat of water is 2257 KJ/kg)

Question 5

A solar energy based heat engine which receives 80KJ of heat at 100 deg C and rejects 70KJ of heat to the ambient at 30 deg C is to be designed. The thermal efficiency of the heat engine is

Question 6

A wire is plastically deformed bent by supplying a force of 40 N over a distance of 0.8 m. (The force moves in the direction in which the distance is measured). If the wire has a mass of 0.2 kg and a specific heat of 0.5 kJ/kg. estimate the maximum increase in the average temperature of the wire

Question 7

In a fluid machinery, the relationship between saturation temperature and pressure decides the process of

Question 8

A sample of gas () is taken through an adiabatic process in which the process in which the volume is compressed from 1600 to 400. If initial pressure is 150 kPa, then how much will be the final pressure in the process?
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