Thermal and Fluids Engineering - General Engineering - Production & Industrial Engineering Previous Year Questions

1

2007 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2007

Oil in a hydraulic cylinder is compressed from an initial volume of 2 m³ to 1.96 m³. If the pressure of oil in the cylinder changes from 40 MPa to 80 MPa during compression, the bulk modulus of elasticity of oil is

A

1000 MPa

B

2000 MPa

C

4000 MPa

D

8000 MPa

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2

2007 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2007

A cylindrical tank is filled with water as shown in the Figure below. The force required to close the discharge tube at the bottom of the tank is

A

18.5 N

B

37 N

C

45.5 N

D

74 N

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3

2007 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2007

A long glass cylinder of inner diameter = 0.03 m and outer diameter = 0.05 m carries hot fluid inside. If the thermal conductivity of glass = 1.05 W/mK, the thermal resistance (°K/W) per unit length of the cylinder is

A

0.031

B

0.077

C

0.17

D

0.34

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4

2007 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2007

If the diameter of the piston is 0.05 m, the force (kN) generated on the piston is

A

1.6

B

4.8

C

9.8

D

12.2

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5

2007 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2007

Statement for Linked Answer Questions 76 & 77:
In the setup shown below, 2kW power is supplied by oil flowing into the cylinder of the hydraulic actuator at the rate of 400 × 10^-6 m³/s.
If the diameter of the piston is 0.05 m, the force (kN) generated on the piston is

A

1.6

B

4.8

C

9.8

D

12.2

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6

2008 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2008

Consider a steady, reversible flow process in a system with one inlet stream and one outlet stream. Potential and kinetic energy effects are negligibly small. Given: \(v\) – specific volume and \(p\) – pressure of the system. The net work done by the system per unit mass flow rate is

A

\(\int p dv\)

B

\(-\int p dv\)

C

\(\int v dp\)

D

\(-\int v dp\)

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7

2008 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2008

A refrigerator, operating in a room at a temperature of 29.5°C, maintains the refrigerated space at 2°C. The maximum possible COP of the refrigerator is

A

1.0

B

7.0

C

10.0

D

11.0

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8

2008 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2008

Consider a steady, reversible flow process in a system with one inlet stream and one outlet stream. Potential and kinetic energy effects are negligibly small. Given: $v$ = specific volume and $p$ = pressure of the system. The net work done by the system per unit mass flow rate is

A

$\int p dv$

B

$-\int p dv$

C

$\int v dp$

D

$-\int v dp$

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9

2008 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2008

Two pipes of uniform section but different diameters carry water at the same volumetric flow rate. Water properties are the same in the two pipes. The Reynolds number, based on the pipe diameter,

A

is the same in both pipes

B

is larger in the narrower pipe

C

is smaller in the narrower pipe

D

depends on the pipe material

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10

2008 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2008

A single cylinder compression ignition engine, operating on the air-standard diesel cycle, has a mean effective pressure of 1.0 MPa and a compression ratio of 21. The engine has a clearance volume of 5x10^-5 m³. The heat added at constant pressure is 2.0 kJ. The thermal efficiency of the engine is

A

10%

B

35%

C

50%

D

70%

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11

2008 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2008

An industrial gas (c_p = 1 kJ/kgK) enters a parallel-flow heat exchanger at 250°C with a flow rate of 2 kg/s to heat a water stream. The water stream (c_p = 4 kJ/kgK) enters the heat exchanger at 50°C with a flow rate of 1 kg/s. The heat exchanger has an effectiveness of 0.75. The gas stream exit temperature will be

A

75°C

B

100°C

C

125°C

D

150°C

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12

2008 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2008

Oil is being pumped through a straight pipe. The pipe length, diameter and volumetric flow rate are all doubled in a new arrangement. The pipe friction factor, however, remains constant. The ratio of pipe frictional losses in the new arrangement to that in the original configuration would be

A

1/4

B

1/2

C

2

D

4

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13

2008 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2008

Air flows steadily at low speed through a horizontal nozzle, which discharges the air into the atmosphere. The area at the nozzle inlet and outlet are 0.1 m² and 0.02 m², respectively. If the air density remains constant at 1.0 kg/m³, the gauge pressure (in kPa) required at the nozzle inlet to produce an outlet speed of 50 m/s would be

A

0.6

B

1.2

C

100.2

D

101.2

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14

2008 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2008

Heat is being transferred convectively from a cylindrical nuclear reactor fuel rod of 50 mm diameter to water at 75 °C. Under steady state condition, the rate of heat generation within the fuel element is 5x10⁷ W/m³ and the convection heat transfer coefficient is 1 kW/m²K. The outer surface temperature of the fuel element would be

A

700 °C

B

625 °C

C

550 °C

D

400 °C

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15

2008 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2008

Air flows steadily at low speed through a horizontal nozzle, which discharges the air into the atmosphere. The area at the nozzle inlet and outlet are 0.1 m² and 0.02 m², respectively. If the air density remains constant at 1.0 kg/m³, the gauge pressure (in kPa) required at the nozzle inlet to produce an outlet speed of 50 m/s would be

A

0.6

B

1.2

C

100.2

D

101.2

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16

2008 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2008

Heat is being transferred convectively from a cylindrical nuclear reactor fuel rod of 50 mm diameter to water at 75 °C. Under steady state condition, the rate of heat generation within the fuel element is 5x10⁷ W/m³ and the convection heat transfer coefficient is 1 kW/m²K. The outer surface temperature of the fuel element would be

A

700 °C

B

625 °C

C

550 °C

D

400 °C

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17

2008 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2008

Statement for Linked Answer Questions 76 and 77:
A wall is heated uniformly at a volumetric heat generation rate of 1 kW/m³. The temperature distribution across the 1m thick wall at a certain instant of time is given by :
\(T(x) = a + bx + cx^2\)
where \(a = 900 °C\), \(b = -300 °C/m\), and \(c = -50 °C/m²\).
The wall has an area of 10 m² (as shown in the figure) and a thermal conductivity of 40 W/mK.
The rate of heat transfer (in kW) into the wall (at x=0) is

A

900

B

450

C

120

D

60

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18

2008 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2008

Statement for Linked Answer Questions 76 and 77:
A wall is heated uniformly at a volumetric heat generation rate of 1 kW/m³. The temperature distribution across the 1m thick wall at a certain instant of time is given by :
\(T(x) = a + bx + cx^2\)
where \(a = 900 °C\), \(b = -300 °C/m\), and \(c = -50 °C/m²\).
The wall has an area of 10 m² (as shown in the figure) and a thermal conductivity of 40 W/mK.
The rate of change of energy storage (in kW) in the wall is

A

130

B

120

C

-10

D

-30

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19

2009 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2009

Which of the following processes is NOT executed by an ideal Rankine cycle with no superheat ?

A

Isentropic expansion

B

Isentropic compression

C

Constant temperature heat addition

D

Constant temperature heat rejection

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20

2009 · Production & Industrial Engineering · General Engineering · Thermal and Fluids Engineering

Production & Industrial Engineering (PI) 2009

The pressure drop for laminar flow of a liquid in a smooth pipe at normal temperature and pressure is

A

directly proportional to density

B

inversely proportional to density

C

independent of density

D

proportional to (density)^{0.75}

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