# The maximum value of the directional derivative of the function Ø=2x2+3y2+5z2 at a point (1, 1, -1) is

1.  10

2.  -4

3.  √152

4.  152

4

√152

Explanation :
No Explanation available for this question

1.  0

2.  π

3.  π/2

4.  2

4

2

Explanation :
No Explanation available for this question

# In a manufacturing plant, the probability of making a defective bolt is 0.1. The mean and standard deviation of defective bolts in a total of 900 bolts are respectively

1.  90 and 9

2.  9 and 90

3.  81 and 9

4.  9 and 81

4

90 and 9

Explanation :
No Explanation available for this question

# if the pressure of gas in bulb A is 50 cm Hg vacuum and patm = 76 cm Hg, the height of column H is equal to

1.  26 cm

2.  50 cm

3.  76 cm

4.  126 cm

4

26 cm

Explanation :
No Explanation available for this question

# For a compressible fluid, sonic velocity is

1.  a property of the fluid

2.  always given by (γRT)where y, R and T are respectively the ratio of specific heats, gas constant and temperature in A

3.    always given by  where P, ρ and s are respectively pressure, density and entropy

4.  always greater than the velocity of fluid at any location.

4

always given by (γRT)where y, R and T are respectively the ratio of specific heats, gas constant and temperature in A

Explanation :
No Explanation available for this question

# When an ideal gas with constant specific heats is throttled adiabatically, withnegligible changes in kinetic and potential energies

1.  h=0, ?T=0

2.  ?h > 0, ?T=0

3.  ?h > 0, ?s > 0

4.  ?h=0, ?s > 0

4

?h=0, ?s > 0

Explanation :
No Explanation available for this question

# When atmospheric air is heated at constant pressure, its

1.  Humidity ratio does not change

2.  Relative humidity increases

3.  Dew point temperature does not change

4.  wet bulb temperature increases

4

Dew point temperature does not change

Explanation :
No Explanation available for this question

# Consider air standard Otto and Diesel cycles, both having the same state of air at the start of compression. If the maximum pressure in both the cycles is the same, the compression ratio T and the efficiency T' are related by

1.   rDiesel > rOtto

2.  rDiesel < rOtto

3.  ηOtto >    ηDiesel

4.  ηOtto <    ηDiesel

4

ηOtto <    ηDiesel

Explanation :
No Explanation available for this question

# Air enters a counter-flow heat exchanger at 70°C and leaves at 40°C. Water enters at 30°C and leaves at 50°C. The LMTD in deg. C is

1.  5.65

2.  4.43

3.  19.52

4.  20.17

4

4.43

Explanation :
No Explanation available for this question

# A fuel represented by the formula C8H16 is used in an I.C. Engine. Given that the molecular weight of air is 29 and that 4.76 kmols of air contain 1 kmol of oxygen and 3.76 kmols of nitrogen, the Air/Fuel ratio by mass is

1.  11.47

2.  12.78

3.  14.79

4.  19.52

4

14.79

Explanation :
No Explanation available for this question

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