Q.1

The pressure exerted by an ideal gas is __________ of the kinetic energy of all the molecules contained in a unit volume of gas.

  • one-half
  • one-third
  • two-third
  • three-fourth
Q.2

In the first law of thermodynamics, the total energy of the system remains constant.

  • True
  • False
Q.3

The efficiency and work ratio of a simple gas turbine cycle are

  • low
  • very low
  • high
  • very high
Q.4

The compression ratio for petrol engines is

  • 3 to 6
  • 5 to 8
  • 15 to 20
  • 20 to 30
Q.5

The efficiency of Diesel cycle increases with

  • decrease in cut-off
  • increase in cut-off
  • constant cut-off
  • none of these
Q.6

When the gas is heated at constant volume, the heat supplied increases the internal energy of the gas.

  • True
  • False
Q.7

When the gas is heated at constant volume, the heat supplied increases the internal energy of the gas.

  • True
  • False
Q.8

The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called

  • specific heat at constant volume
  • specific heat at constant pressure
  • kilo Joule
  • none of these
Q.9

Coal gas is obtained by mixing coal and gas at ambient conditions.

  • Yes
  • No
Q.10

Which of the following is the lightest and most volatile liquid fuel?

  • Gasoline
  • Kerosene
  • Fuel oil
Q.11

There is a loss of heat in an irreversible process.

  • True
  • False
Q.12
Heat is
  • hot
  • the energy that is transferred between objects because of a temperaturedifference
  • the quantity measure from the average kinetic energy of vibrating molecules in a substance
Q.13
Which of the following has the highest calorific value?
  • Anthracite coal
  • Bituminous coal
  • Peat
  • Lignite
Q.14
How does a refrigerator work?
  • Moves heat from inside the fridge to the room
  • Blows cold air into the fridge
  • Uses convection cells
  • It generates cold air
Q.15
Mixture of ice and water form a
  • Heterogeneous system
  • Closed system
  • Open system
  • Isolated system
Q.16
Addition of heat at constant pressure to a gas results in
  • Raising its temperature
  • Raising its pressure
  • Raising its volume
  • Raising its temperature and doing external work
Q.17
Warm air rises and cold air sinks demonstrates what?
  • conduction
  • convection
  • radiation
  • refrigeration
Q.18
Define Exothermic
  • Energy is released; ΔH is negative; Going from Gas to Liquid, Liquid to Solid
  • Energy is absorbed; ΔH is positive; Going from Gas to Liquid, Liquid to Solid
  • Energy is released; ΔH is positive; Going from Solid to Liquid, Liquid to Gas
  • Energy is absorbed; ΔH is negative; Going from Gas to Liquid, Liquid to Solid
Q.19
Which of the following is NOT a conductor?
  • oven mitt
  • curling iron
  • iron skillet
  • copper pipe
Q.20
Which of the following gas has the highest calorific value?
  • Coal gas
  • Producer gas
  • Mond gas
  • Blast furnace gas
Q.21
The absolute zero pressure can be attained at a temperature of
  • 0°C
  • -273°C
  • 273 K
  • None of these
Q.22
What happens to particles when they are heated?
  • They speed up and spread out
  • They slow down and compress
  • They stop moving
  • They move closer together and speed up
Q.23
When cut-off ratio is ________; the efficiency of Diesel cycle approaches to Otto cycle efficiency
  • 1/4
  • Zero
  • 1/5
  • 2
Q.24
Water has a specific heat ofJ/KgºC. Wood has a specific heat ofJ/KgºC. What material needs more energy to raise the temperature 1ºC
  • Wood
  • Water
  • Both are the same
Q.25
In closed cycle gas turbine, the air is compressed
  • Isothermally
  • Isentropically
  • Polytropically
  • None of these
Q.26
If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to
  • +ve
  • -ve
  • Zero
  • Anywhere between zero and infinity
Q.27
How are solids different from liquids?
  • particles in solids are moving freely around each other.
  • particles in solids have no motion.
  • particles in solids are vibrating in place.
  • particles in solids have more motion than in liquids
Q.28
Carbonization of coal consists of
  • Drying and crushing the coal to a fine powder
  • Moulding the finely ground coal under pressure with or without a binding material
  • Heating the wood with a limited supply of air to temperature not less than 280°C
  • None of the above
Q.29
The value of cp/cv for air is
  • 1
  • 1.4
  • 1.45
  • 2.3
Q.30
The unit of power in S.I. units is
  • Newton
  • Pascal
  • Erg
  • Watt
0 h : 0 m : 1 s