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This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on Thermodynamics Set 2
Q1 | Which of the following is the best fuel for diesel engines?
- Olefins
- Pulsejet
- Aromatics
- Naphthenes
- Paraffins
Q2 | Air leaking from a punctured tube is an example of
- Throttling
- Constant volume expansion
- Adiabatic expansion
- Constant pressure expansion
- Isothermal expansion
Q3 | The percentage of carbondioxide in the exhaust gases from a diesel engine cannot exceed
- 40%
- 50.50%
- 29%
- 36%
- 55%
Q4 | Internal energy of a perfect gas depends on
- Temperature, specific heats and entropy
- Temperature, specific heats and pressure
- Temperature, specific heats and enthalpy
- Temperature and specific heats
- Temperature only
Q5 | The process during which external work done is not zero, is
- Constant volume process
- Constant pressure process
- Throttling
- Free expansion
- All of the above
Q6 | Which of the following cycle consists of two isothermal and constant volume processes?
- Joule cycle
- Diesel cycle
- Rankine cycle
- Otto cycle
- Ericsson cycle
Q7 | A perfect black body is
- One which absorbs all radiant energy at all wavelengths
- One which does not reflect the radiant energy
- Black in colour
- One through which radiant energy is not transmitted
- One which absorbs total radiant energy
Q8 | The characteristics of a control volume are
- There is no material flow across the boundary
- The volume, shape and position with respect to an observer may change
- Pulsejet
- The volume, shape and position with respect to an observer are fixed
Q9 | By doubling the temperature the radiant heat will increase
- 16 times
- microns
- 4 times
- 8 times
- 2 times
Q10 | Which of the following is not a property of the system
- Temperature
- Pressure
- Specific volume
- Heat
- None of the above
Q11 | The mixture formation in a carburettor is based on the principle of
- Venturi principle
- Pascal's law
- Law of vapours
- Daltons law
- Newtons law of motion
Q12 | Heating wet steam at constant temperature is same as heating at
- Constant pressure
- Constant volume
- Constant enthalpy
- Constant entropy
- None of the above
Q13 | A liquid flowing through a tube is turbulent. In which case will the maximum change in heat transfer coefficient occur?
- Diameter of the tube is increased 4 time maintaining the ratio of liquid flow constant
- Diameter of the tube is increased 4 times maintaining the velocity of flow constant
- Diameter of the tube is increased 2 times maintaining the rate of liquid flow constant
- Diameter of the tube is increased 2 times maintaining the velocity of flow constant
- microns
Q14 | All of the following cycles consists of two isothermal processes EXCEPT
- Ericsson cycle
- Stirling cycle
- Brayton cycle
- Carnot cycle
- Pulsejet
Q15 | Which of the following introduces irreversibility in the actual Carnot engine operation?
- Higher operating speeds
- Losses from working fluid in transit
- Pulsejet
- Changes in pressure and temperature during the cycle
- Friction between moving parts
Q16 | Which of the following is the best fuel for S.I. engines?
- Naphthenes
- Olefins
- Aromatics
- Pulsejet
- Paraffins
Q17 | The cycle generally used for gas turbines is
- Brayton cycle
- Carnot cycle
- Dual cycle
- Otto cycle
- Rankine cycle
Q18 | The slope of constant pressure line on temperature entropy diagrm is given by
- 90?
- T/Cp
- Cp/T
- S/T
- T/S
Q19 | In automobiles clutch is mounted between
- Gear box and differential
- Differential and wheels
- Engine and flywheel
- Engine and differential
- Flywheel and gear box
Q20 | During an adiabatic process the change in entropy is
- Positive or Negative
- Zero
- Negative
- Approximately zero
- Positive
Q21 | The behaviour of which of the following vapour is closer to that of a gas?
- Wet vapour
- Wet and superheated vapours
- Wet and dry vapour
- Superheated vapour
- Dry vapour
Q22 | The ratio of the rise in temperature of a gas when compressed adiabatically to that when compressed isothermally to the same extent is
- Depends on the gas
- Pulsejet
- less than 1
- Equal to 1
- More than 1
Q23 | In all irreversible processes, the entropy of the system
- Increases
- Depends on medium
- Remains constant
- Sometimes increases and sometimes decreases
- Reduces to zero
Q24 | Which of the following remains constant during an adiabatic process?
- internal energy
- enthalpy
- entropy
- All of the above
- Pulsejet
Q25 | Reduced pressure is
- dimensionless
- an index of molecular position of gas
- always unity
- Pulsejet
- always less than atmospheric pressure