# An automobile engine operates at a fuel air ratio of 0.05, volumetric efficiency of 90% and indicated thermal efficiency of 30%. Given that the calorific value of the fuel is 45 MJ/kg and the density of air at intake is 1 kg/m3, the indicated mean effective pressure for the engine is

1.  6.075 bar

2.    6.75 bar

3.  67.5 bar

4.   243 bar

4

6.075 bar

Explanation :
No Explanation available for this question

# For an engine operating on air standard Otto cycle, the clearance volume is 10% of the swept volume. The specific heat ratio of air is 1.4. the air standard cycle efficiency is

1.  38.3 %

2.  39.8%

3.  60.2%

4.  61.7%

4

61.7\%

Explanation :
No Explanation available for this question

# A centrifugal pump running at 500 rpm and at its maximum efficiency is delivering a head of 30m at a flow rate of 60 litres per minute. If the rpm is changed to 1000, then the head H in metres and flow rate Q in litres per minute at maximum efficiency are estimated to be

1.  H=60,Q= 120

2.  H= 120,Q= 120

3.    H = 60, Q = 480

4.  H = 120, Q = 30

4

H= 120,Q= 120

Explanation :
No Explanation available for this question

# Hardness of steel greatly improves with

1.  annealing

2.  cyaniding

3.  normalizing

4.  tempering

4

tempering

Explanation :
No Explanation available for this question

# With a solidification factor of 0.97x976 s/m2, the solidification time (in seconds) for a spherical casting of 200 mm diameter is

1.  539

2.  1078

3.    4311

4.  3233

4

1078

Explanation :
No Explanation available for this question

# The velocity of point B with respect to point A is a vector of magnitude

1.  0

2.  w(r8 —rA)and direction opposite to the direction of motion of point B

3.  w(r8 —rA)and direction same as the direction of motion of point B

4.  w(r8 —rA)and direction being from 0 to Z

4

w(r8 —rA)and direction same as the direction of motion of point B

Explanation :
No Explanation available for this question

# A shell of 100 mm diameter and 100 mm height with the corner radius of 0.4 mm is to be produced by cup drawing. The required blank diameter is

1.  118 mm

2.  161 mm

3.  224 mm

4.    312 mm

4

224 mm

Explanation :
No Explanation available for this question

# A brass billet is to be extruded from its initial diameter of 100 mm to a final diameter of 50 mm. The working temperature of 700°C and the extrusion constant is 250 MPa. The force required for extrusion is

1.  5.44 MN

2.  2.72 MN

3.  1.36 MN

4.  0.36 MN

4

2.72 MN

Explanation :
No Explanation available for this question

# A metal disc of 20 mm diameter is to be punched from a sheet of 2 mm thickness. The punch and the die clearance is 3%. The required punch diameter

1.  19.88 mm

2.    19.94 mm

3.  20.06 mm

4.  20.12 mm

4

19.88 mm

Explanation :
No Explanation available for this question

1.  29

2.    31

3.  37

4.  42

4