| 1. | What will be the thermal stress developed in a rod having a diameter of 4 cm and length of 2 m. It experiences heating from temperature 50°C to 200°C. The coefficient of thermal expansion is a = 10 x 10^-6° / °C and young's modulus is 250 GPa ? | |
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300
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325
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350
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375
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Report Question| 2. | Which of the following is a dimensionless quantity ? | |
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Shear stress
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Poisson's ratio
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Torque
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None of these
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| 3. | What will be the value of Poisson’s ratio,if the elasticity and rigidity of the material is 200 GPa and 66.67 GPa ? | |
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0
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0.25
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0.5
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1
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| 4. | What will be the dryness fraction for liquid (m1) and vapour (m2) mixtureWhat will be the dryness fraction for liquid (m1) and vapour (m2) mixture ? | |
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x= (m1+m2)/m1
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x= m2/(m1+m2)
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x= (m1+m2)/m2
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x= m1/(m1+m2)
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| 5. | What is the amount of maximum work that can be extracted from a Carnot engine working between temperature 1000 K and 100 K ? | |
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0.1
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0.5
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0.9
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0.99
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| 6. | When the degree of randomness increases, what is the change in entropy ? | |
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Decreases
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Increases
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Unpredictable
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Remains constant
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| 7. | Which entropy value best defines the state of water at triple point ? | |
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Zero
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More than zero
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Less than zero
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None of these
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| 8. | Which of the following cycle is used in compression ignition (SI) engine ? | |
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Carnot cycle
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Diesel cycle
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Dual cycle
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Otto cycle
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| 9. | The self ignition temperature of diesel is .......... as compared to that of petrol ? | |
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is higher
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is lower
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is same
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cannot be determined
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| 10. | What happens when supercharging is done for spark ignition engines ? | |
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Increase knocking
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Decrease knocking
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No effect
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May increase or decrease
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