# In a vapour compression refrigeration system, liquid to suction heat exchanger is used to

1.  keep the COP constant

2.  prevent the liquid refrigerant from entering the compressor

3.  subcool the liquid refrigerant leaving the condenser

4.  subcool the vapour refrigerant from the evaporator

4

subcool the liquid refrigerant leaving the condenser

Explanation :
No Explanation available for this question

# A steel seam pipe 10 cm inner diameter and 11 cm outer diameter is covered with an insulation having a thermal conductivity of 1 W/mK. If the convective heat transfer coefficient between the surface of insulation and the surrounding air is 8 W/m2K, the critical radius of insulation is

1.  10 cm

2.  11cm

3.  12.5 cm

4.  15 cm

4

12.5 cm

Explanation :
No Explanation available for this question

# Which of the following is a pressure compounded turbine

1.  Parsons

2.  Curtis

3.  Rateau

4.  all the three

4

Rateau

Explanation :
No Explanation available for this question

# When the speed of a centrifugal pump is doubled, the power required to drive thepump will

1.  increase 8 times

2.   increase 4 times

3.  double

4.   remain the same

4

increase 4 times

Explanation :
No Explanation available for this question

# Global warming is caused by

1.  ozone

2.  Carbon dioxide

3.  Nitrogen

4.  carbon monoxide

4

Carbon dioxide

Explanation :
No Explanation available for this question

# Navier Strokes equation represents the conservation of

1.  energy

2.  mass

3.  pressure

4.  momentum

4

momentum

Explanation :
No Explanation available for this question

# In  a   bi-axial  stress  problem,  the  stresses  in  x and  y directions  are σx = 200 MPa and σy = 100 MPa. the maximum principal stress in MPa, is

1.  50

2.  100

3.  150

4.  200

4

200

Explanation :
No Explanation available for this question

# The ratio of tension on the tight side to that on the slack side in a flat belt drive is:

1.  proportional to the product of coefficient of friction and lap angle

2.  an exponential function of the product of coefficient of friction and lap angle

3.  proportional to the lap angle

4.   proportional to the coefficient of friction

4

an exponential function of the product of coefficient of friction and lap angle

Explanation :
No Explanation available for this question

# The natural frequency of an undamped vibrating system is 100 rad/s. A damper with a damping factor of 0.8 is introduced into the system. The frequency of vibration of the damped system, in rad/s, is

1.  60

2.  75

3.  80

4.  100

4

60

Explanation :
No Explanation available for this question

1.  40

2.  50

3.  100

4.  250

4