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Engineering :: Production Engineering

561.  Which of the following defect results due to mixing of two streams of molten metal that are too cold to fuse properly?
A. Shrinkage B. Honey coming
C. Swell D. Scab
E. Cold shut    
562.  Which one of the following is a natural abrasive?
A. Alundum B. Corundum
C. Boron carbide D. Carborundum
E. None of the above    
563.  Which of the following is not a fine finishing operation?
A. Tumbling B. Grinding
C. Honing D. Lapping
E. Buffing    
564.  Plug rolling is used to
A. Remove out of roundness of pipes B. Cut threads at the ends of pipes
C. Increase the wall thickness of pipes at ends D. Reduce the diameter of pipe
E. Reduce the wall thickness and increase the diameter of tubes already made    
565.  Continuous chips in ductile metals is promoted by
A. Insufficient cooling B. Small rake angle
C. Rine feed D. Low cutting speed
566.  A process of zinc diffusion is known as
A. Anodising B. Brazing
C. Metallizing D. Sherardizing
E. Sintering    
567.  Continuous chips
A. Waste power due to heat generation B. Cause good surface finish
C. Do not require cooling D. Are easily disposable
568.  Discontinuous chip in ductile material is produced because of
A. Sharp cutting edge B. Insufficient cooling
C. Low friction D. Large rake angle
569.  The capacity of cupola is usually in the range
B. 10 tons 10 100 tons
C. 100 to 250 tons D. 250 tons to 400 tons
E. 500 tons to 1000 tons    
570.  Merchant's machinability constant is
A. ? + ? - ? B. 2 ? - ? + ?
C. 2 ? + ? - ? D. 2 ? - ? - ?

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