Mine Mechanisation - I Mid - I, September - 2014

1.A spur gear system has two gears of 24 and 33 teeth of module 4. The centre distance in mm between the driving and the driven shafts of the spur gear is ....... ?
  • 57.0
  • 228.0
  • 28.5
  • 114.0
Answer: D
2.Rope used for haulage transport in underground mine purposes is...........?
  • Lang’s lay type
  • ordinary lay type
  • full locked coil rope
  • half locked coil rope
Answer: A
3.The gradient suitable for main and tail rope haulage is........?
  • +1 in 4
  • + 1 in 5
  • + 1 in 6
  • + 1 in 7
Answer: C
4.Jip pulley used in..........?
  • Direct rope haulage
  • endless rope haulage
  • gravity rope haulage
  • main and tail rope haulage
Answer: C
5.Squirrel cage motor used in.........?
  • Direct rope haulage
  • endless rope haulage
  • gravity haulage
  • main and tail rope haulage
Answer: B
6.The maximum permissible gradient for locomotive is............?
  • 1 in 12
  • 1 in 14
  • 1 in 16
  • 1 in 15
Answer: D
7.Function of snub pulley in the belt conveyor system is................?
  • Cleaning device
  • Safety device
  • Braking device
  • Increasing the angle of wrap
Answer: D
8.A twin cable ropeway consists of................?
  • Two rack ropes and one traction rope
  • one track rope and two traction ropes
  • two track ropes and two traction rope
  • three track ropes and one traction rope
Answer: A
9..............plate is used to join two tracks?
  • Fish plates
  • Iron plate
  • Nose cob
  • Check block
Answer: A
10.Stepped fishplates are also known as .......?
  • Joggled fishplates
  • fish bolts
  • alternative rods
  • huck bolts
Answer: A
11.According to types of gears .................................are preferred to heavy drives
Answer: Helical gear
12..........................type of rope haulage suitable for undulating roadways is?
Answer: Main and tail rope haulage
13.Maximum damage to a haulage rope is caused by.......................?
Answer: Wear and tear
14.A locomotive haulage train transports 50 te of coal in its out by journey. In the return journey in takes back 50 te of material in by. The digital gradient for this locomotive haulage system is...........................?
Answer: Zero
15.Maximum permissible gradient for high angle conveyor transportation is........................?
Answer: 60degrees
16.In direct rope haulage the maximum gradient for applicability is.......................?
Answer: 12degree
17.In endless rope haulage the suitable gradient for applicability is......................?
Answer: 1 in 6
18.The maximum angle of inclination for conveying coal on PVC belting is.............?
Answer: 16 degrees
19.In belt conveyor the belt speed generally preferred......................to..........?
Answer: 45 m/min to 60m/min
20.Function of pull cord in the belt conveyor system is.............................?
Answer: Safety stopping device