Question Set 22

Question No. 1

What are two essential conditions of perfect gas?


It satisfies equation of state and its specific heats are constant.

Question No. 2

Enthalpy and entropy are functions of one single parameter. Which is that?



Question No. 3

What is DTSI Technology?


DTSI stands for Digital Twin Spark Plug Ignition. The vehicles with DTSI Technology use 2 spark plugs which are controlled by digital circuit. It results in efficient combustion of air fuel mixture.

Digital – Since the spark generation will be initiated by a microchip.

Twin – Since two spark plugs will be used.

Spark ignition – Since the ignition will be done via a spark.

Question No. 4

Why rate of condensation is higher on a polished surface compared to rusty surface?


Polished surface promotes drop wise condensation and does not wet the surface.

Question No. 5

How much resistance is offered to heat flow by drop wise condensation?


No resistance offered.

Question No. 6

What are the Advantages and Disadvantages of using LPG in Car?



1. Complete combustion

2. Fuel saving

3. Homogeneous combustion


1. As complete combustion is occurring, more heat liberated, not advised for long journey, engine will be over heated

2. Installation is difficult

3. Reduce engine life efficiency

Question No. 7

Which has more Efficiency Diesel Engine or Petrol Engine?


Diesel engine has the better efficiency out of two.

Question No. 8

What is the relationship between COP of heating and cooling?


COP of heating is one (unity) more than COP of cooling.

Question No. 9

How much is the work done in isochoric process?



Question No. 10

Why Entropy decreases with increase in temperature?


ds = dQ/T, i.e.  Entropy is inversely proportional to the temperature. So, as temperature Increases, entropy decreases.

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