# Calculate the punch size in mm , for a circular blanking operatin in whicb details  are given below: Size of the blank             25mm Thickness of the sheet     2mm Radial clearance between punch and die    0.06mm Die allowance         0.05mm

1.  24.83

2.  24.89

3.  25.01

4.  25.17

4

24.83

Explanation :
No Explanation available for this question

# In a single pass rolling process using 410mm diameter steel  rollers, a strip of width 140mm and thickness 8mm undergoes 10% reduction of thickness. The angle of bite in radians is

1.  0.006

2.  0.031

3.  0.062

4.  0.600

4

0.062

Explanation :
No Explanation available for this question

# In a DC arc welding operation, the voltage –arc length characterstics was obtained as Varc=20+5l where the arc length I was varied between 5mm and 7mm. here varc denotes the arc voltage in volts. The arc current was varied from 400A to 500A. Assuming linear power source characteristic, the open circuit voltage and short circuit current for the welding operation are

1.  45V, 450A

2.  75V, 550A

3.  95V, 950A

4.  150V, 1500A

4

95V, 950A

Explanation :
No Explanation available for this question

# A large tank with a nozzle attached contains three immiscible inviscid fluids as shown. Assuming that the changes in h1, h2 and h3 are negligible, the instanneous discharge velocity is

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# Water (Cp=4.18kj/kg-k) at 800C enters a counter flow heat exchanger with a mass flow rate of 0.5 kg/s. Air (Cp=1kj/kg-k) enters at 300c with a mass flow rate of 2.09 kg/s. if the effectiveness of the heat exchanger is 0.8, the LMTD is

1.  40

2.  20

3.  10

4.  5

4

10

Explanation :
No Explanation available for this question

# A solid steel cube constrained on all six faces is heated so that the temperature rises uniformly by ΔT. If the thermal coefficient of the material is α, youngs modulus is E and the poisons ratio is v, the thermal stress developed in the cube due to heating is

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# A solid circular shaft needs to be designed to transmit a torque of 50 NM. If the allowable shear stress of the material is 140Mpa, assuming a factor of safety of 2, the minimum allowable design diameter in mm is

1.  8

2.  16

3.  24

4.  32

4

16

Explanation :
No Explanation available for this question

# A force of 400N is applied to the brake drum of 0.5m diameter in a band brake system as shown in the fig. where the wrapping angle is 1800. If the coefficient of friction b/w the drum and the band is 0.25, the braking torque applied in nm is

1.  100.6

2.  54.4

3.  22.1

4.  15.7

4

54.4

Explanation :
No Explanation available for this question

# A box contains 4 red balls and 6 black bells. Three balls are selected randomly from the box one after another without replacement. The probability that the selected set contains one red ball and 2 black balls is

1.  1/20

2.  1/12

3.  3/10

4.  1/2

4

1/2

Explanation :
No Explanation available for this question

# The system of algebraic equations given below has X+2y+2=4 2x+y+2z=5 x-y+z=1

1.  A unique solution of x=1, y=1 and z=1

2.  Only the two solutions of (x=1, y=1 and z=1) and (x=2, y=1 and z=0)

3.  Infinite no. of solutions

4.  No feasible solution

4