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Engineering :: Production Engineering

321.  Mechanical seals are used
A. To prevent vibrations B. To prevent leakage
C. To reduce friction D. To balance the equipment
E. None of the above    
322.  All mechanical seals have two flat sealing surfaces
A. At right angles to the axis of rotation B. Parallel to the axis of rotation
C. Parallel to the end plate D. None of the above
323.  In a stationary type mechanical seal the sealing ring is generally located
A. In machine housing B. Along machine shaft
C. Independently D. None of the above
324.  The audible spectrum of sound is in the range of
A. 0 to 100 cps B. 30 to 15000 cps
C. 15000 to 25000 cps D. 25000 to 10000 cps
325.  The decibel is
A. Unit of noise level B. A logarithmic ratio between a measured quantity and a reference quantity
C. Quantity of noise per unit area D. A logarithmic ratio between a measured quantity and 100
E. None of the above    
326.  A very soft whisper may have noise level of
A. About 10 db B. About 30 db
C. About 40 db D. About 100 db
E. About 140 db    
327.  Noise level in case of an aircraft is
A. Generally less than 100 db B. Generally more than 100 db
C. Always more than 100 db D. In the range of 60 - 80 db
E. In the range of 80 - 110 db    
328.  For the soldering of galvanized iron the flux used is
A. Hydrochloric acid B. Zinc oxide
C. Muriatic acid D. Ammonium chloride
E. None of the above    
329.  For soldering of brass and copper, the flux used is
A. Zinc chloride B. Hydrochloric acid
C. Cupric acid D. Ammonium chloride
E. None of the above    
330.  A soldering iron is used mainly to
A. Heat the metal B. Melt the solder
C. Heat the flux D. None of these

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