# For laminar flow through a long pipe, the pressure drop per unit length increases

1.  in linear proportion to the cross-sectional area

2.  in proportion to the diameter of the pipe

3.  in inverse proportion to the cross-sectional area

4.    in inverse proportion to the square of cross-sectional area

4

in inverse proportion to the cross-sectional area

Explanation :
No Explanation available for this question

# For a current wire of 20 mm diameter exposed to air (h = 20 W/m2 K), maximum heat dissipation occurs when thickness of insulation (k = 0.5 W/m2K) is

1.  20 mm

2.  25 mm

3.   20mm

4.  10 mm

4

25 mm

Explanation :
No Explanation available for this question

# Tool life of 10 hours is obtained when cutting with single point tool at 63 m/min. If Taylor's constant C = 257.35, tool life on doubling the velocity will be

1.  5 hours

2.  25.7 min

3.   38.3min

4.  unchanged

4

25.7 min

Explanation :
No Explanation available for this question

# A wire of 0-t mm diameter is drawn from a rod of IS mm diameter. Dies giving reductions of 20%, 40% and 80% are available. For minimum error in the final side, the number of stages and reduction at each stage respectively would be

1.  3 stages and 80% reduction for all three stages

2.  4 stages and 80% reduction for first three stages followed by a finishing stage of 20% reduction

3.  5 stages and reduction of 80%, 80%, 40%, 40%,20% in a sequence

4.  none of the above

4

none of the above

Explanation :
No Explanation available for this question

# A 50 mm diameter disc is to be punched out from a carbon steel sheet 1.0 mm thick. The diameter of the punch should be

1.  49.925 mm

2.  50 00 mm

3.  50.075 mm

4.   None of these

4

None of these

Explanation :
No Explanation available for this question

# In an assembly line for assembling toys, five workers are assigned tasks which lake times of 10, 8, 6, 9 and 10 minutes respectively. The balance delay for the line is

1.  43.5%

2.  14.8%

3.  14.0%

4.  16.3%

4

16.3\%

Explanation :
No Explanation available for this question

# Preliminary work sampling studies show that machine was idle 25% of the lime based on a sample of 100 observations. The number of observations needed for a confidence level of 95% and an accuracy of ± 5% is

1.  400

2.  1200

3.  3600

4.  4S00

4

4S00

Explanation :
No Explanation available for this question

# The probability of a defective piece being produced in a manufacturing process is 0.01. The probability that out of 5 successive pieces, only one is defective, is

1.  (0.99)4 (0.01)

2.  (0.99) (0.01)4

3.  5 x (0.99)(0.01)4

4.  5 x (0.99)4 (0.01)

4

5 x (0.99)4 (0.01)

Explanation :
No Explanation available for this question

# If the two principal strains at a point are 1000 x 10-6 and -600 x 10-6, then the maximum Shear strain is:

1.  800x10-6

2.  500x10-6

3.  1600x10-6

4.  200x10-6

4

200x10-6

Explanation :
No Explanation available for this question

1.  60 degrees

2.  37.4 degrees

3.  30 degrees

4.  45 degrees

4