46. During the filling process of a given sand mould cavity by molten metal through a horizontal runner of circular C.S, the frictional head loss of the molten metal in the runner will increase with the

1. 1. Increase in runner diameter

   
   
   

   2. Decrease internal surface roughness of the runner

   
   
   

   3. Decrease in length of runner

   
   
   

   4. Increase in average velocity of molten metal

   
   
   

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1. View Hint View Answer Discuss in Forum

   HL =	4fLV²
   	2gD

   Correct Option: C

   HL =	4fLV²
   	2gD

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47. In sand casting process, a sphere and a cylinder of equal volumes are separately cast from the sand molten metal under identical conditions. The height and diameter of the cylinder are equal. The ratio of the solidification time of the sphere to that of the cylinder is

1. 1. 1.14

   
   
   

   2. 0.87

   
   
   

   3. 1.31

   
   
   

   4. 0.76

   
   
   

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1. View Hint View Answer Discuss in Forum

   Volume of both casting are equal & cylinder casting having height and dia equal
   

   π	D³c =	π	× D³s
   4		4

   
   D_s = 1.14D_c

   Correct Option: A

   Volume of both casting are equal & cylinder casting having height and dia equal
   

   π	D³c =	π	× D³s
   4		4

   
   D_s = 1.14D_c

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48. For the CNC part programming, match Group A with Group B:
    Group A
    P. Circular interpolation, counter clock wise
    Q. dwell
    R. circular interpolation, clock wise
    S. point to point countering
    Group B
    I. G02
    II. G03
    III.G04
    IV. G00

1. 1. P-II, Q-III, R-I, S-IV

   
   
   

   2. p -I, Q-III, R-II, S-IV

   
   
   

   3. P-I, Q-IV, R-II, S-III

   
   
   

   4. p-II, Q-I, R-III, S-IV

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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49. Slip gauges are calibrated by outside micrometer (T/F)

1. 1. True

   
   
   

   2. False

   
   
   

   3. NA

   
   
   

   4. NA

   
   
   

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1. View Hint View Answer Discuss in Forum

   False

   Correct Option: B

   False

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50. Which among the NC operations given below are continuous path operations?
    Arc Welding (AW)
    Drilling (D)
    Laser Cutting of Sheet (LC)
    Milling (M)
    Punching in Sheet Metal (P)
    Spot Welding (SW)

1. 1. AW, LC and M

   
   
   

   2. AW, D, LC and M

   
   
   

   3. D, LC, P and SW

   
   
   

   4. D, LC, and SW

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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