| 1. | What happens to the COP of a heat pump, when the temperature difference between source and sink is decreased ? | |
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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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Report Question| 2. | What type of slopes does constant pressure line have in the superheated region of the Mollier diagram ? | |
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Positive slope
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Negative slope
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Zero slope
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First positive than negative slope
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| 3. | For a gas with n degree of freedom, what will be the value of Cp/Cv ? | |
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n+1
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n-1
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1-2/n
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1+2/n
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| 4. | With which of the following age hardening is related ? | |
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Cast iron
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Gun metal
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Duralumin
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German silver
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| 5. | Monel metal is an alloy of ? | |
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Cu and Cr
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Ni and Cu
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Ni and Cr
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Cu, Ni and Cr
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| 6. | The bonding of a rubber sheet with a metal is done by ? | |
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Welding
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High frequency dielectric heating
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Induction welding
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Adhesive bonding
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| 7. | Plain and butt welds may be used on materials upto approximately ? | |
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25 mm thick
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40 mm thick
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50 mm thick
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75 mm thick
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| 8. | An optical gauge works on the principle of ? | |
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reflection of light rays
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polarisation of light rays
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interference of light rays
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refraction of light rays
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| 9. | Generally, the strongest form in which metals can be used as ? | |
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hot rolling
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cold rolling
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extrusion
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forging
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| 10. | Thermite is a mixture of ? | |
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five aluminium and iron oxide in the ratio of 3:1
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five iron and aluminium oxide in the ratio of 3:1
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five aluminium and iron oxide in the ratio of 3:1, with traces of sulphur, phosphorus and manganese
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molten iron and aluminium, with the ratio depending upon the type of the surface to be welded
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