A Best Way To Crack Gorenment Job Exams

Mechanical Engineering Objective Questions { Production Technology }



883. Surface speed of the grinding wheel in centreless grinding is
A.15 to 60 m/min
B.1500 to 1800 m/min
C.500 to 1000 m/min
D.1000 to 1500 m/min
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884. The surface speed of regulating wheel in centreless grinding varies from
A.10-15 m/min
B.15-60 m/min
C.60-120 m/min
D.120-240 m/min
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885. Following grinding speed (surface metres per minute) is used for grinding plain carbon steels
A.250-500
B.500-900
C.1000-1500
D.1500-2000
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886. For very fine finishing and polishing of metals such as ball bearing races, following type of bond is used
A.Vitrified
B.Resinoid
C.Shellac
D.Silicate
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887. Following operation needs to be performed to obtain surface finish of the order of 0.75 to 1.25 μm
A.Grinding
B.Honing
C.Buffing
D.Lapping
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888. In centreless grinding operation, the regulating wheel rotates at
A.1 to 15 m/min
B.25 to 60 m/min
C.60 to 100 m/min
D.100 to 180 m/min
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889. The sizes (diameter) of grinding wheel and regulating wheel in centreless grinding operation are
A.100 mm, 50 mm
B.200 mm, 100 mm
C.300 mm, 150 mm
D.500 mm, 300 mm
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