Thermal Science Mid - I, September - 2014

1.First law of thermodynamics applied to a cyclic process
  • Q1-2 = W1-2 + U
  • Q = W
  • Q1-2 = W1-2
  • Q1-2 = W2-1
Answer: B
2.Zeroth law of thermodynamics is based on
  • Thermodynamic equilibrium
  • Thermal equilibrium
  • Mechanical equilibrium
  • Chemical equilibrium
Answer: B
3.Property defined by first law of thermodynamics
  • Temperature
  • Internal Energy
  • Entropy
  • Pressure
Answer: B
4.Temperature is an
  • Intensive property
  • Extensive property
  • Not a property
  • none
Answer: A
5.Minimum number of intensive properties required to represent the state of a single phase system
  • One
  • Two
  • Three
  • Four
Answer: B
6. dU =
  • W
  • Q
  • Zero
  • One
Answer: C
7.Process in which maximum work can be obtained
  • Constant Volume process
  • Constant Pressure process
  • Constant Temperature process
  • adiabatic process
Answer: B
8.Internal energy of a perfect gas is a function of
  • Temperature only
  • Temperature and Pressure
  • Volume only
  • Volume and pressure
Answer: A
9.Example for closed system
  • Thermos flask
  • Turbine
  • Nozzle
  • None
Answer: D
10.Property which tells us the occurrence of a particular process
  • Temperature
  • Internal Energy
  • Enthalpy
  • Entropy
Answer: D
11.PMM-1 stands for ……..
Answer: Perpectual motion machine of first kind
12.1 kg of air at 1 bar, 150C is compressed reversibly and adiabatically to a pressure of 4 bar, then final temperature ……..
Answer: 1550C
13.Properties are …….. functions
Answer: Point
14.Entropy generation in an irreversible process ………
Answer: > 0
15.Kelvin plank’s law deals with …….
Answer: Conservation of heat and work
16.An engine working on carnot cycle has maximum and minimum temperatures are 9600C and 3160C, then Efficiency is …….
Answer: 64.15%
17.In the polytropic process equation pvn = constant, if n is infinitely large, the process is termed as ……….
Answer: Constant volume
18.Zeroth law is the basis of ……..
Answer: Temperature
19.A friction less heat engine can be 100% efficient only if its exhaust temperature is ……
Answer: 00K
20.In an irreversible cycle, the entropy of the system ……….
Answer: Not changes