Utilization of Electrical Energy

www.jntuworld.com Code No: 05420201 Set No. 1 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD IV B.Tech. II Sem., I Mid-Term Examinations, March – 2010 UTILIZATION OF ELECTRICAL ENERGY Objective Exam Name: ______________________________ Hall Ticket No. A

Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 20.

I

Choose the correct alternative:

1.

Resistance ovens using alloys of 80% nickel and 20% chromium are used upto a temperature limit of [ ] 0 0 0 0 a) 100 C b) 273 C c) 1000 F d) 1000 C

2.

In high frequency eddy current heating, the major part is played by the phenomena of [ ] a) hysteresis loss b) hysteresis and eddy current loss c) skin effect d) induction effect

3.

The types of arc furnaces a) direct and indirect arc furnaces c) constant liquid type of arc furnaces

4.

D L

[

]

b) gaseous and liquid type of arc furnaces d) three phase type of arc furnaces

R O

The voltage required to produce arc in welding is in the range of a) 20-30V b) 50-100V c) 100-220V

[

]

d) 220-400V

5.

The visible radiations lie between a) 500-2500 AU b) 100-1000 Angstrom unit (A.U)

6.

Brightness of a surface is defined as the luminous intensity per a) unit area projected b) 1m2 plane c) 1 cm2 curved surface

7.

Polar curves are the relation between [ ] a) lamp power and poles of street light b) candle power and angular position c) MHCP and MSCP d) Rousseau’s candle power and distance from pole bottom

8.

Joining of two similar materials by electrical means is called a) electrolytic process b) illumination c) electric welding

9.

Pick up the false statement a) electrodes used in arc furnaces are self baking b) direct arc furnace is used to produce pure steel c) three phase arc furnaces operate an 400 V supply d) indirect-arc furnace is used to melt nonferrous metals

10.

In high frequency eddy current heating, the depth of penetration ‘d’ is related to the relative permeability µr , conductivity σ mhos/m3 at frequency f as [

W U

[ ] c) 400-4000 A U d) 4000-7500 AU

T N

J

1 a) d = 2π

109

µ rσ f

cm

b) d =

µ rσ f 10

9

cm

1 c) d = 2π

[ ] d) one meter

[ d) air conditioning [

107

µ rσ f

cm d) d =

µ rσ f 107

]

]

cm

Cont…2

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]

www.jntuworld.com Code No: 05420201

-2-

Set No. 1

II.

Fill in the blanks:

11.

Angstrom unit (AU) is equal to ________ metres.

12.

The two laws of illumination are (1) _______________ (2) ___________

13.

The most commonly used metal for filaments ____________

14.

The normal value of p.f at which an electric arc furnace is to be operated is between ________

15.

One of the types of heat transfer is __________

16.

In individual drive ______ electric motor is used to drive one individual machine.

17.

The process of smoothing out of fluctuations in load is known as __________

18.

Integrating sphere is employed for measurement is ________

19.

The relation between lux and lumens/m2 is __________

20.

Low temperature heating chamber with provision for ventilation to termed as ________

R O

D L

W U -oOo-

T N

J

www.jntuworld.com

www.jntuworld.com Code No: 05420201 Set No. 2 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD IV B.Tech. II Sem., I Mid-Term Examinations, March – 2010 UTILIZATION OF ELECTRICAL ENERGY Objective Exam Name: ______________________________ Hall Ticket No. A

Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 20.

I

Choose the correct alternative:

1.

The voltage required to produce arc in welding is in the range of a) 20-30V b) 50-100V c) 100-220V

[

]

d) 220-400V

2.

The visible radiations lie between a) 500-2500 AU b) 100-1000 Angstrom unit (A.U)

[ ] c) 400-4000 A U d) 4000-7500 AU

3.

Brightness of a surface is defined as the luminous intensity per a) unit area projected b) 1m2 plane c) 1 cm2 curved surface

4.

Polar curves are the relation between [ ] a) lamp power and poles of street light b) candle power and angular position c) MHCP and MSCP d) Rousseau’s candle power and distance from pole bottom

5.

Joining of two similar materials by electrical means is called a) electrolytic process b) illumination c) electric welding

6.

Pick up the false statement a) electrodes used in arc furnaces are self baking b) direct arc furnace is used to produce pure steel c) three phase arc furnaces operate an 400 V supply d) indirect-arc furnace is used to melt nonferrous metals

7.

In high frequency eddy current heating, the depth of penetration ‘d’ is related to the relative permeability µr , conductivity σ mhos/m3 at frequency f as [

[ ] d) one meter

D L

R O

W U

a) d =

1 2π

T N

J

109

µ rσ f

cm

b) d =

µ rσ f 10

9

cm

c) d =

1 2π

107

µ rσ f

[ d) air conditioning [

cm d) d =

µ rσ f 107

]

]

]

cm

8.

Resistance ovens using alloys of 80% nickel and 20% chromium are used upto a temperature limit of [ ] 0 0 0 0 a) 100 C b) 273 C c) 1000 F d) 1000 C

9.

In high frequency eddy current heating, the major part is played by the phenomena of [ ] a) hysteresis loss b) hysteresis and eddy current loss c) skin effect d) induction effect

10.

The types of arc furnaces a) direct and indirect arc furnaces c) constant liquid type of arc furnaces

[ b) gaseous and liquid type of arc furnaces d) three phase type of arc furnaces Cont…2

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]

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-2-

Set No. 2

II.

Fill in the blanks:

11.

The normal value of p.f at which an electric arc furnace is to be operated is between ________

12.

One of the types of heat transfer is __________

13.

In individual drive ______ electric motor is used to drive one individual machine.

14.

The process of smoothing out of fluctuations in load is known as __________

15.

Integrating sphere is employed for measurement is ________

16.

The relation between lux and lumens/m2 is __________

17.

Low temperature heating chamber with provision for ventilation to termed as ________

18.

Angstrom unit (AU) is equal to ________ metres.

19.

The two laws of illumination are (1) _______________ (2) ___________

20.

The most commonly used metal for filaments ____________

R O

W U -oOo-

D L

T N

J

www.jntuworld.com

www.jntuworld.com Code No: 05420201 Set No. 3 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD IV B.Tech. II Sem., I Mid-Term Examinations, March – 2010 UTILIZATION OF ELECTRICAL ENERGY Objective Exam Name: ______________________________ Hall Ticket No. A

Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 20.

I

Choose the correct alternative:

1.

Brightness of a surface is defined as the luminous intensity per a) unit area projected b) 1m2 plane c) 1 cm2 curved surface

2.

Polar curves are the relation between [ ] a) lamp power and poles of street light b) candle power and angular position c) MHCP and MSCP d) Rousseau’s candle power and distance from pole bottom

3.

Joining of two similar materials by electrical means is called a) electrolytic process b) illumination c) electric welding

4.

Pick up the false statement a) electrodes used in arc furnaces are self baking b) direct arc furnace is used to produce pure steel c) three phase arc furnaces operate an 400 V supply d) indirect-arc furnace is used to melt nonferrous metals

5.

In high frequency eddy current heating, the depth of penetration ‘d’ is related to the relative permeability µr , conductivity σ mhos/m3 at frequency f as [

[ ] d) one meter

D L

[ d) air conditioning

R O

a) d =

1 2π

109

µ rσ f

W U

T N

cm

b) d =

µ rσ f 10

9

cm

c) d =

1 2π

107

µ rσ f

cm d) d =

[

µ rσ f 107

]

]

]

cm

J

6.

Resistance ovens using alloys of 80% nickel and 20% chromium are used upto a temperature limit of [ ] a) 1000C b) 2730C c) 10000F d) 10000C

7.

In high frequency eddy current heating, the major part is played by the phenomena of [ ] a) hysteresis loss b) hysteresis and eddy current loss c) skin effect d) induction effect

8.

The types of arc furnaces a) direct and indirect arc furnaces c) constant liquid type of arc furnaces

9.

10.

[

]

b) gaseous and liquid type of arc furnaces d) three phase type of arc furnaces

The voltage required to produce arc in welding is in the range of a) 20-30V b) 50-100V c) 100-220V The visible radiations lie between a) 500-2500 AU b) 100-1000 Angstrom unit (A.U)

[

]

d) 220-400V

[ ] c) 400-4000 A U d) 4000-7500 AU Cont…2

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www.jntuworld.com Code No: 05420201

-2-

Set No. 3

II.

Fill in the blanks:

11.

In individual drive ______ electric motor is used to drive one individual machine.

12.

The process of smoothing out of fluctuations in load is known as __________

13.

Integrating sphere is employed for measurement is ________

14.

The relation between lux and lumens/m2 is __________

15.

Low temperature heating chamber with provision for ventilation to termed as ________

16.

Angstrom unit (AU) is equal to ________ metres.

17.

The two laws of illumination are (1) _______________ (2) ___________

18.

The most commonly used metal for filaments ____________

19.

The normal value of p.f at which an electric arc furnace is to be operated is between ________

20.

One of the types of heat transfer is __________

R O

W U -oOo-

D L

T N

J

www.jntuworld.com

www.jntuworld.com Code No: 05420201 Set No. 4 JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD IV B.Tech. II Sem., I Mid-Term Examinations, March – 2010 UTILIZATION OF ELECTRICAL ENERGY Objective Exam Name: ______________________________ Hall Ticket No. A

Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 20.

I

Choose the correct alternative:

1.

Joining of two similar materials by electrical means is called a) electrolytic process b) illumination c) electric welding

2.

Pick up the false statement a) electrodes used in arc furnaces are self baking b) direct arc furnace is used to produce pure steel c) three phase arc furnaces operate an 400 V supply d) indirect-arc furnace is used to melt nonferrous metals

3.

In high frequency eddy current heating, the depth of penetration ‘d’ is related to the relative permeability µr , conductivity σ mhos/m3 at frequency f as [ a) d =

1 2π

109

µ rσ f

cm

b) d =

µ rσ f 10

9

cm

[ d) air conditioning [

D L

R O

c) d =

1 2π

107

µ rσ f

cm d) d =

µ rσ f 107

]

]

]

cm

W U

4.

Resistance ovens using alloys of 80% nickel and 20% chromium are used upto a temperature limit of [ ] a) 1000C b) 2730C c) 10000F d) 10000C

5.

In high frequency eddy current heating, the major part is played by the phenomena of [ ] a) hysteresis loss b) hysteresis and eddy current loss c) skin effect d) induction effect

6.

The types of arc furnaces a) direct and indirect arc furnaces c) constant liquid type of arc furnaces

7.

T N

J

[

]

b) gaseous and liquid type of arc furnaces d) three phase type of arc furnaces

The voltage required to produce arc in welding is in the range of a) 20-30V b) 50-100V c) 100-220V

[

]

d) 220-400V

8.

The visible radiations lie between a) 500-2500 AU b) 100-1000 Angstrom unit (A.U)

[ ] c) 400-4000 A U d) 4000-7500 AU

9.

Brightness of a surface is defined as the luminous intensity per a) unit area projected b) 1m2 plane c) 1 cm2 curved surface

10.

Polar curves are the relation between [ ] a) lamp power and poles of street light b) candle power and angular position c) MHCP and MSCP d) Rousseau’s candle power and distance from pole bottom

[ ] d) one meter

Cont…2

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www.jntuworld.com

Code No: 05420201

-2-

Set No. 4

II.

Fill in the blanks:

11.

Integrating sphere is employed for measurement is ________

12.

The relation between lux and lumens/m2 is __________

13.

Low temperature heating chamber with provision for ventilation to termed as ________

14.

Angstrom unit (AU) is equal to ________ metres.

15.

The two laws of illumination are (1) _______________ (2) ___________

16.

The most commonly used metal for filaments ____________

17.

The normal value of p.f at which an electric arc furnace is to be operated is between ________

18.

One of the types of heat transfer is __________

19.

In individual drive ______ electric motor is used to drive one individual machine.

20.

The process of smoothing out of fluctuations in load is known as __________

R O

D L

W U -oOo-

T N

J

www.jntuworld.com