| 1. | If a heat engine produces work only by interacting with one source. What kind of machine is this ? | |
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Perpetual motion machine of first kind (PMM1)
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Perpetual motion machine of second kind (PMM2)
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Perpetual motion machine of third kind (PMM3)
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None of these.
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Report Question| 2. | The point beyond which there is no distinct vapourIzation process is called ________ ? | |
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critical point
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saturation point
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boiling point
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melting point
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| 3. | What is the dryness fraction (x) of a saturated liquid ? | |
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0
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10
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1
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Cannot be determined
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| 4. | What happens to the COP of a heat pump, when the temperature difference between source and sink is increased ? | |
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Decreases
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First decreases then increases
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First increases then decreases
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Increases
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| 5. | A heat engine performs a work of 100 kJ per cycle. The efficiency of the engine is 50%. What will be the amount of heat rejected (in kJ) per cycle ? | |
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0
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50
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100
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200
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| 6. | The flow through a turbine in a Mollier diagram is represented by a ________ ? | |
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curved line convex up
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curved line convex down
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horizontal line
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vertical line
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| 7. | _______ is present in high percentage in magnet steel ? | |
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Aluminium
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Tungsten
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Zinc
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Copper
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| 8. | Foundry crucible is made up of ? | |
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Graphite
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Lead
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Cast iron
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Mild steels
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| 9. | Corundum contains more than 95% ? | |
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MgO
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SiO?
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Al?O?
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Steel
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| 10. | Pipes of bicycle frames are made of _______ steel ? | |
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cast
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hot rolled
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carbon chrome
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dead mild
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