Materials

#1. The best known conductor of electricity is....?

copper

silver

gold

aluminium

incorrect

#2. Melting point of silver is....?

861°C

961°C

1084°C

434°C

incorrect

#3. Brass is an alloy of.....?

copper and tin

copper and lead

copper and zinc

zinc and tin

incorrect

#4. Bronze is an alloy of....?

tin and lead

copper and tin

copper and zinc

tin and zinc

#5. ACSR Stands for....?

Aluminium conductor steel reinforced

Aluminium conductor silver reinforced

Aluminium copper steel reinforced

Aluminium conductor steel rod

#6. Super conductor shows the resistance of....?

high

low

zero

none of the above

#7. Melting point of aluminium is....?

640°C

660°C

680°C

686°C

#8. Semiconductor shows the co-efficient of resistance is....?

zero

positive

negative

none of the above

incorrect

resistance decreases with increase in temperature showing exponentially.

#9. Material used for making cable shields is....?

aluminium

copper

lead

brass

incorrect

#10. Variable resistors are made by....?

carbon

copper

thin film

wire wound

incorrect

#11. High resistivity material is....?

constantan

eureke

manganin

nichrome

#12. Material showing lowest resistivity is....?

manganin

silver

nichrome

constantan

#13. When trivalent impurity is added to intrinsic semiconductor to form.....?

N type semiconductor

P type semiconductor

tetra valent semi conductor

#14. Example of trivalent impurity is....?

Arsenic

Boron

Antimony

Bismuth

#15. Thermistors shows.....?

a negative temperature resistivity

a positive temperature resistivity

zero resistivity

none of the above

#16. The heating element of irons are made of....?

copper

constantan

nichrome

aluminium

#17. Example of semiconductor is....?

aluminium

coper

carbon

silver

#18. The most malleable, ductile low resistivity material is....?

copper

aluminium

steel

silver

#19. Which is not a semiconductor?

germanium

silicon

argon

selenium

#20. A pure semiconductor at ordinary conditions, behaves as....?

a conductor

a magnetic material

a ferro magntic material

an insulator

#21. AAAC stand for....?

All aluminium alloy conductor

All aluminium and copper

All alloy of aluminium conductor

none of the above

#22. Melting point of manganin is.....?

860°C

960°C

1260°C

440°C

#23. Constantan(eureka) is an alloy of....?

copper and zinc

copper and tin

copper and nickel

copper and platinum

incorrect

high resistive material

#24. Filament of incandescent lamps are made up of....?

tungsten

nichrome

manganin

eureka

incorrect

tungsten also called wolfram

#25. Which metal shows liquid form at room temperature?

yittrium

osmium

cesium

mercury

incorrect

mercury in silver white colour

#26. The properties of fuse element is....?

high melting point high conductivity

high melting point low conductivity

low melting point high conductivity

low melting point low conductivity

#27. Fuse element made of....?

alloy of tin and zinc

alloy of tin and lead

alloy of copper and tin

alloy of tin and zinc

#28. Minimum current at which fuse element is melt is calles?

fusing current

rated current

perspective current

cut off current

#29. Ratio of fusing current to the current rating of fuse element is called?

cut off current

fusing current

fusing factor

breaking capacity

#30. The maximum value of the fault current actually reached before the fuse melts is called....?

fusing current

breaking current

perspective current

cut off current

#31. Fusing factor is always .....?

zero

less than one

one

more than one

#32. The colour bands of a resistor are read as brown, black, orange, silver. then the value of the resistor is....?

1kiloohm

10 kilo ohm

100 ohm

10 ohm

#33. The most commonly used electrical conductor is....?

lead

tin

brass

copper

#34. An electrical joint should provide at....?

nearly zero resistance

low resistance

high resistance

very high resistance

#35. Solder is a mixture of....?

copper and tin

copper and lead

tin and lead

tin and brass

#36. Fusing factor of HRC fuse is....?

1

1.1

1.2

1.4

#37. Fusing factor of LRC fuse is...?

1

1.1

1.2

1.4

#38. Minimum voltage which when applied to an insulating material will result in the destruction of its insulating properties called.....?

cut off voltage

minimum voltage

break down voltage

perspective voltage

#39. When temperature increases the dielectric strength of insulator is....?

increase

decreases

not effect

same

#40. Humidity ......the dielectric strength of insulator ?

decrease

increase

not affect

#41. Factors agfecting dielectric losses are....?

frequency

humidity

temperature

rise in voltage

all the above

#42. Class ...... insulation has their operating temperature 155°C?

A

B

E

F

#43. Reluctivity analogous to....?

resitivity

conductivity

permeability

retentivity

#44. Reluctance is analogous to....?

conductance

permeance

resistane

#45. Class ......insulation has their operating temperature is 180°C?

A

B

E

H

#46. When supply frequency increases, dielectric strength of an insulator is....?

same

increases

decreases

zero

#47. Chloroprene rubber is also called....?

butyl rubber

neoprene

hard rubber

natural rubber

#48. Chloroprene rubber is also called....?

butyl rubber

neoprene

hard rubber

natural rubber

#49. Alloy of nickel and iron called?

silicon steel

perm alloy

CRGO

Alnico

#50. Alloy of nickel and iron called?

silicon steel

perm alloy

CRGO

Alnico

#51. Resistivity of silver is ....?

1.6 x 10^_8

2 x 10^4

3.2 x 10^_4

5 x 10^3

#52. Example of pentavalent impirity is....?

boron

antimony

aluminium

argon

#53. When forward biasing applied across PN junction increase the width of depletion layer will.....?

decreasing

increasing

same

#54. Cut in voltage of silicon is...?

0.2

0.3

0.6

0.7

ge=0.3

#55. Cut in voltage of germanium is...?

0.2

0.3

0.6

0.7

ge=0.3

#56. The process by which the light energy is obtained by applying electrical energy called....?

photoelectric effect

photo light

electroluminescence

electric light

#57. The loss appearing in the form of heat due to reversal of electric stresses compelling molecular rearrangement is known as.....?

copper loss

dielectric loss

heat loss

skin effect

#58. While soldering ICs maximum temperature should not exceed....?

165°C

265°C

325°C

456°C

#59. Application of paper in indulating material is restricted to temperatures upto....?

50°C

100°C

140°C

80°C

#60. Dielectric constant of vaccum is....?

0

1

100

infiniy

#61. Dielectric loss is propotional to...?

frequency

square of the frequency

half of the frequency

one third of the frequency

#62. Dielectric loss is propotional to...?

frequency

square of the frequency

half of the frequency

one third of the frequency

#63. The dielectric strength of air under normal conditions in KV/cm is about....?

30

40

25

100

Results

#1. The best known conductor of electricity is....?

#2. Melting point of silver is....?

#3. Brass is an alloy of.....?

#4. Bronze is an alloy of....?

#5. ACSR Stands for....?

#6. Super conductor shows the resistance of....?

#7. Melting point of aluminium is....?

#8. Semiconductor shows the co-efficient of resistance is....?

#9. Material used for making cable shields is....?

#10. Variable resistors are made by....?

#11. High resistivity material is....?

#12. Material showing lowest resistivity is....?

#13. When trivalent impurity is added to intrinsic semiconductor to form.....?

#14. Example of trivalent impurity is....?

#15. Thermistors shows.....?

#16. The heating element of irons are made of....?

#17. Example of semiconductor is....?

#18. The most malleable, ductile low resistivity material is....?

#19. Which is not a semiconductor?

#20. A pure semiconductor at ordinary conditions, behaves as....?

#21. AAAC stand for....?

#22. Melting point of manganin is.....?

#23. Constantan(eureka) is an alloy of....?

#24. Filament of incandescent lamps are made up of....?

#25. Which metal shows liquid form at room temperature?

#26. The properties of fuse element is....?

#27. Fuse element made of....?

#28. Minimum current at which fuse element is melt is calles?

#29. Ratio of fusing current to the current rating of fuse element is called?

#30. The maximum value of the fault current actually reached before the fuse melts is called....?

#31. Fusing factor is always .....?

#32. The colour bands of a resistor are read as brown, black, orange, silver. then the value of the resistor is....?

#33. The most commonly used electrical conductor is....?

#34. An electrical joint should provide at....?

#35. Solder is a mixture of....?

#36. Fusing factor of HRC fuse is....?

#37. Fusing factor of LRC fuse is...?

#38. Minimum voltage which when applied to an insulating material will result in the destruction of its insulating properties called.....?

#39. When temperature increases the dielectric strength of insulator is....?

#40. Humidity ......the dielectric strength of insulator ?

#41. Factors agfecting dielectric losses are....?

#42. Class ...... insulation has their operating temperature 155°C?

#43. Reluctivity analogous to....?

#44. Reluctance is analogous to....?

#45. Class ......insulation has their operating temperature is 180°C?

#46. When supply frequency increases, dielectric strength of an insulator is....?

#47. Chloroprene rubber is also called....?

#48. Chloroprene rubber is also called....?

#49. Alloy of nickel and iron called?

#50. Alloy of nickel and iron called?

#51. Resistivity of silver is ....?

#52. Example of pentavalent impirity is....?

#53. When forward biasing applied across PN junction increase the width of depletion layer will.....?

#54. Cut in voltage of silicon is...?

#55. Cut in voltage of germanium is...?

#56. The process by which the light energy is obtained by applying electrical energy called....?

#57. The loss appearing in the form of heat due to reversal of electric stresses compelling molecular rearrangement is known as.....?

#58. While soldering ICs maximum temperature should not exceed....?

#59. Application of paper in indulating material is restricted to temperatures upto....?

#60. Dielectric constant of vaccum is....?

#61. Dielectric loss is propotional to...?

#62. Dielectric loss is propotional to...?

#63. The dielectric strength of air under normal conditions in KV/cm is about....?

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