Thursday, 5 January 2017

Previous Year COAL INDIA Question based on Memory

Q1-Gear hobbing process is faster than milling because
1. Indexing time is less 
2. Several teeth cut at a time
3. Hob rotates faster
4. Work rotates faster

Q2-The pitch point of Cam is
1. any point on the pitch curve
2. a point on the pitch curve having minimum pressure angle
3. a point on the pitch curve having maximum pressure angle
4. any point on the pitch circle


Q3-Dressing of grinding wheels to restore sharpness is done by
1. Solid carbon steel bar
2. Tool steel dresser
3. Diamond dresser
4. Sharped edge H.S.S. cutter


Q4-Two shafts A and B are made of the same material. The diameter of shaft B is twice that of shaft A. The ratio of power which can be transmitted by shaft A to the shaft B is
1. 1/8
2. 1/2
3. 1/4
4. 1/16


Q5-The rear axle half shaft is connected to
1. Sun gear
2. Crown wheel
3. Drive pinion
4. Differential cage

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