The best fit line using least squares for the data (0,0), (10,  24), (20,  36) and (30, 60) is

1.  2x – y =0

2.  2x – y+4 =0

3.  2x – y – 4 =0

4.  None of these

View Answer  
4
Correct Answer :

None of these


Explanation :
No Explanation available for this question

The maximum principal strain in a thin cylindrical tank, having a radius of 25 cm and wall thickness of 5 mm when subjected to  an internal pressure  of  1  MPa, is (taking Young‘s modulus as 200 GPa and Poisson‘s ratio as 0.2)

1.  2.25x10-1

2.  2.25

3.  2.25x10-6

4.  22.5

View Answer  
4
Correct Answer :

2.25x10-1


Explanation :
No Explanation available for this question

A square bar of side 4 cm  and length 100 cm is subjected to an axial load P. thesame bar is then used as a  cantilever beam and subjected to an end  load P. the ratio of the strain energies, stored in the bar is  the second case to that stored in the first case, is:

1.  16

2.  400

3.   1000

4.  2500

View Answer  
4
Correct Answer :

2500


Explanation :
No Explanation available for this question

An IC engine has a bore and stroke of 2 units each.Thearea to calculate heat loss can be taken as

1.  4π

2.  5 π

3.  6 π

4.  8 π

View Answer  
4
Correct Answer :

6 π


Explanation :
No Explanation available for this question

An  air breathing aircraft  is flying at  an  altitude  where  the air  density  is  half  the value at ground level. With reference to the ground level, the air-fuel ratio at this altitude will be

1.  3√2

2.  √2

3.  2

4.  4

View Answer  
4
Correct Answer :

2


Explanation :
No Explanation available for this question

For the data listed below for two journal bearings A and B, predict the flow conditions in the bearings Bearing Diameter (m) Radial dearance (m) Surface speed of shaft (m/s) Viscosity of lubricant (Pa-s) Density of lubricant (kg/m3) A 0.01 10-5 210 0.001 1000 B 0.05 10-4 10 0.01 850

1.  laminar in both A and B

2.  turbulent in both A and B

3.  Laminar in A and turbulent in B

4.  turbulent in A and laminar B

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4
Correct Answer :

turbulent in A and laminar B


Explanation :
No Explanation available for this question

The isentropic heat drop in the  nozzle of an impulse steam turbine with a nozzle efficiency 0.9, blade velocity ratio 0.5, and mean blade velocity 150 m/s in kJ/kg is:

1.  50

2.  40

3.  60

4.  75

View Answer  
4
Correct Answer :

50


Explanation :
No Explanation available for this question

Air (Cp=1 kJ/kg, γ=1.4) enters a compressor at a temperature of 270C. the compressor pressure ratio is 4. Assuming an efficiency of 80 %, the compressor work required in kJ/kg is

1.  160

2.  172

3.  182

4.  225

View Answer  
4
Correct Answer :

182


Explanation :
No Explanation available for this question

The dicharge velocity at the pipe exit in

1.  √2gH

2.  √2gh

3.  √g(H+h)

4.   0

View Answer  
4
Correct Answer :

√2gh


Explanation :
No Explanation available for this question

A steel ball of mass 1 kg and specific heat 0.4 kJ/kg is at a temperature of 60°C It is dropped into 1 kg water at 20°C. The final steady state temperature of water is:

1.  23.5°C

2.   30°C

3.  35°C

4.  40°C

View Answer  
4
Correct Answer :

23.5°C


Explanation :
No Explanation available for this question
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