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Engineering :: Metallurgy


11.  Spherical metal powders are usually produced by
A. Electrolytic process B. Automization
C. Reduction D. Oxidation
E. Milling    

12.  Normal mercury thermometer can be used upto
A. 100?C B. 212?C
C. 300?C D. 500?C
E. 800?C    

13.  The upper range of mercury thermometer can be increased by
A. Increasing tube diameter B. Providing steel tube
C. Taking into account expansion of tube D. Filling the stem with nitrogen under pressure
E. Range cannot be increased    

14.  Th phenomenon of emf development between two diferent metals placed in contact is known as
A. Seeback effect B. Thomson effect
C. Peltier effect D. Kelvin effect
E. Thermocouple effect    

15.  Which thermocouple can measure the highest temperature?
A. Copper-constantan B. Iron constantan
C. Chromel-alumel D. Platinum-rhodium
E. Tungsten- molybdenum    

16.  The principle on which a disappearing filamment type pyrometer works is known as
A. Kirchhoff's law B. Fourier's law
C. Wien's law D. Peltier effect
E. Seeback effect    

17.  Under identical values of cold and hot junction temperatures which thermocouple given the highest output
A. Iron constantan B. Nickel nimo
C. Chromel-constantan D. Platinum-platinum-rhodium
E. All give equal output    

18.  The measurement junction of a thermocouple is taken from an environment of 300?C to 600?C. If time constant of the thermocouple is 1 second, temperature indicated by it, in ?C, after 1 second would be about
A. 100 B. 400
C. 457 D. 497
E. 600    

19.  An instrument which is used for measuring temperature variations by change in a metallic resistance is called a
A. Thermopile B. Bolometer
C. Thennocouple D. thermo-generator
E. Thermo-galvanometer    

20.  A solder consists of
A. Lead and tin B. Tin and white metal
C. Zinc and lead D. Zinc and tin
E. Tin and antimony    




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