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Engineering :: Production Engineering

381.  A rack is gear of
A. Infinite pitch B. Infinite module
C. Infinite diameter D. Infinite number of teeth
382.  A triple threaded worm is in mesh with a worm wheel of 40 teeth. If the worm revolves at 1200 rpm, the of the worm wheel will be
A. 10 B. 30
C. 40 D. 90
E. 270    
383.  An optical gauge works on the principle of
A. Reflection of light rays B. Polarisation of light rays
C. Interference of light rays D. Refraction of light rays
E. Dispersion of light rays    
384.  A sinebar is used to measure
A. Surface roughness B. Gear profiles
C. Internal tapers D. External tapers
E. All of the above    
385.  A 20 mm diameter international metric thread will have a pitch of
A. 1 mm B. 1.25 mm
C. 1.50 mm D. 2.0 mm
E. 2.5 mm    
386.  A process applying oxide coating on aluminium is known as
A. Oxidizing B. Galvanising
C. Pickering D. Anodizing
E. Blanking    
387.  What multiple of basic unit is 'atto'?
A. 10--9 B. 10--12
C. 10--15 D. 10--18
E. 10--20    
388.  A circular mill is
A. A milling machine used for cutting circular jobs by giving motion to the job during cutting B. A milling operation done on lathe is known as circular mill
C. A circle of 1 metre diameter D. Area of a circle of 1 mile radius
E. Area of 0.001 inch diameter circle    
389.  Which one of the following is not a vector quantity?
A. Impulse B. Momentum
C. Force D. Acceleration
E. Time    
390.  Profile of a gear tooth is to be checked. Which one of the following device would you choose?
A. Optical pyrometer B. Bench micrometer
C. Sine bear D. Telescopic gauge
E. Optical projector    

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