Consider  a  two  stage  reciprocating  air  compressor  with  a  perfect  intercooler operating at the best intermediate  pressure. Air enters the low-pressure  cylinder at 1 bar, 27°C and leaves the high-pressure cylinder  at 9 bar. Assume the index of  compression  and  expansion  in  each  stage  is  1.4,  and  that  for  air  R  =  286.7 J/kg K, the work done per kg air in the high pressure cylinder is

1.  111 kJ

2.  222 kJ

3.  37 kJ

4.  74 kJ

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4
Correct Answer :

111 kJ


Explanation :
No Explanation available for this question

Clearance volume of a reciprocating compressor is 100 ml, and the volume of the cylinder  at bottom  dead centre  is 1.0 litre.  The clearance ratio of the compressor

1.  1/11

2.  1/10

3.  1/9

4.  1/12

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4
Correct Answer :

1/9


Explanation :
No Explanation available for this question

A mass of 35 kg is suspended from a weightless bar AC, which is supported by a cable CB and a pin at A as shown in the Figure. The pin reactions at A on the b AB are

1.  RX=343.4 N RY=755.4 N

2.  RX=343.4 N  RY=0

3.  RX=755.4 N RY=343.4 N

4.  RX=755.4 N RY=0

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4
Correct Answer :

RX=755.4 N

RY=0


Explanation :
No Explanation available for this question

A small element at the critical section of a componen  is i  a bi-axial  state  of stress with the two principal stresses being 360 MPa and 140 MPa. The maximum working stress according to Distortion Energy Theory is

1.  220 MPa

2.  110 MPa

3.  314 MPa

4.  330 MPa

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4
Correct Answer :

110 MPa


Explanation :
No Explanation available for this question

The dynamic load capacity of 6306 bearing is 22 kN. The maximum radial load itcan sustain to operate at 600 rev/min, for 2000 hours is:

1.  4.16 kN

2.   3.60 kN

3.   6.25 kN

4.  5.29 kN

View Answer  
4
Correct Answer :

3.60 kN


Explanation :
No Explanation available for this question

The  percentage  improvement  in  power  capacity  of  a  flat  belt  drive,  when  the wrap  angle  at  the  driving  pulley  is  increased  from  150°  to  210°  by  an  idler arrangement for a friction coefficient of 0.3 is:

1.  25.21

2.  33.92

3.   40.17

4.  67.85

View Answer  
4
Correct Answer :

67.85


Explanation :
No Explanation available for this question

In  a typical metal cutting operation, using  a cutting tool of  positive  rake it was observed that the shear angle was 20°. The friction angle is  

1.  25.21

2.  33.92

3.  40.17

4.  67.85

View Answer  
4
Correct Answer :

67.85


Explanation :
No Explanation available for this question

A  cutting  tool  has  a  radius  of  1.8  mm.  The  feed  rate  for  a  theoretical  surface roughness of  Ra=5µm is:

1.   0.36 mm/rev

2.  0.187 mm/rev

3.  0.036 mm/rev

4.  0.0187 mm/rev

View Answer  
4
Correct Answer :

0.187 mm/rev


Explanation :
No Explanation available for this question

Three blocks B1, B2 and B3   are to be inserted in a channel of width  S  maintaining  a minimum  gap  of  with  T  =  0.125  mm,  as shown in Figure 2.17. For P =  18.75 ± 0.8 : Q= 25.00 ±0.12: R=28.125 ± 0.1 and s= 72.35 + x, ( Where all dimensions are in mm), the tolerance X is:

1.  + 0.38

2.  - 0.38

3.  + 0.05

4.  – 0.05

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4
Correct Answer :

– 0.05


Explanation :
No Explanation available for this question

In  a  forecasting  model,  at  the  end  of  period  13,  the  forecasted  value for  period  14 is 75. Actual value in the periods 14 to 16 are constant at 100. if the assumed simple  exponential  smoothing  parameter  is  0.5,  then  the  MSE  at  the  end  of period 16 is:

1.  820.31

2.  273.44

3.  43.75

4.  14.58

View Answer  
4
Correct Answer :

273.44


Explanation :
No Explanation available for this question
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