# A venturimeter of 20 mm throat diameter is used to measure the velocity of water in a horizontal pipe of 40 mm diameter. If the pressure difference between the pipe and throat sections is found to be 30 kPa then, neglecting frictional losses, the flow velocity is

1.  0.2 m/s

2.  1.0 m/s

3.  1.4 m/s

4.  2.0 m/s

4

2.0 m/s

Explanation :
No Explanation available for this question

# A U-tube manometer with a small quantity of mercury is used to measure the static pressure difference between two locations A and B on a conical section through which an incompressible fluid flows. At a particular flow rate, the mercury column appears as shown in the figure. The density of mercury is 13699 kg/m3 and g = 9.81 m/s2. Which of the following is correct

1.  Flow direction is A to B and pA – pB = 20 kPa

2.  Flow direction is B to A and pA – pB = 1.4 kPa

3.  Flow direction is A to B and pB – pA = 20 kPa

4.  Flow direction is B to A and pB – pA = 1.4 kPa

4

Flow direction is A to B and pA – pB = 20 kPa

Explanation :
No Explanation available for this question

# A reversible thermodynamic cycle containing only three processes and producing work is to be constructed. The constraints are: (i) there must be one isothermal process, (ii) there must be one isentropic process, (iii) the maximum and minimum cycle pressures and the clearance volume are fixed, and (iv) polytrophic processes are not allowed. Then the numbers of possible cycles are

1.  will be slightly less than 5 bar

2.  will be slightly more than 5 bar

3.  will be exactly 5 bar

4.  cannot be ascertained in the absence of the value of a

4

will be slightly less than 5 bar

Explanation :
No Explanation available for this question

# Heat flows through a composite slab, as shown below. The depth of the slab is 1 m. the k values are in W/m K. the overall thermal resistance in K/W is

1.  17.2

2.  21.9

3.  28.6

4.  39.2

4

39.2

Explanation :
No Explanation available for this question

# A small copper ball of 5 mm diameter at 500 K is dropped into an oil bath whose temperature is 300 K. the thermal conductivity of copper is 400 W/m.K, its density 9000 kg/m and its specific heat 385 J/kg. K. if the heat transfer 3 coefficient is 250 W/m2. K and lumped analysis is assumed to be valid, the rate of 2 fall of the temperature of the ball at the beginning of cooling will be, in K/s

1.  8.7

2.  13.9

3.  17.3

4.  27.7

4

8.7

Explanation :
No Explanation available for this question

# A solid cylinder (surface 2) is located at the center of a hollow sphere (surface 1). The diameter of the sphere is 1m, while the cylinder has a diameter and length of 0.5m each. The radiation configuration factor F11 is

1.  0.375

2.  0.625

3.  0.75

4.  1

4

0.75

Explanation :
No Explanation available for this question

# Hot oil is cooled from 80 to 50oC in an oil cooler which uses air as the coolant. The air temperature rises from 30 to 40oC. The designer uses a LMTD value of 26oC. The type of heat exchanger is

1.  parallel flow

2.  double pipe

3.  counter flow

4.  cross flow

4

cross flow

Explanation :
No Explanation available for this question

# The vapor compression refrigeration cycle is represented as shown in the figure below, with state 1 being the exit of the evaporator. The coordinate system used in this figure is

1.  p-h

2.  T-s

3.  p-s

4.  T-h

4

p-h

Explanation :
No Explanation available for this question

# A vapor absorption refrigeration system is a heat pump with three thermal reservoirs as shown in the figure. A refrigeration effect of 100W is required at 250 K when the heat source available is at 400 K. Heat rejection occurs at 300 K. The minimum value of heat required (in W) is

1.  167

2.  100

3.  80

4.  20

4

80

Explanation :
No Explanation available for this question

# Various psychrometric processes are shown in the figure below Name of the process process in figure P. 0-1 i. Chemical dehumidification Q. 0-2 ii. Sensible heating R. 2-3 iii. Cooling and dehumidification S. 0-4 iv. Dehumidification with steam injection T. 0-5 v. Dehumidification with water injection

1.  P-i, Q-ii, R-iii, S-iv, T-v

2.  P-ii, Q-i, R-iii, S-v, T-iv

3.  P-ii, Q-i, R-iii, S-iv, T-v

4.  P-iii, Q-iv, R-v, S-i, T-ii

4