Electrical engineering material miscellaneous Easy Questions and Answers | Page - 50

Electrical engineering material miscellaneous

Silicon diodes are preferred to germanium diodes for high temperature operation because:

1. doping of silicon is a simple processes
1. rate of increase of reverse saturation current with temperature is more in the case of silicon
1. the reverse saturation current of silicon diodes is smaller than that of germanium
1. silicon diodes can be used to rectify even very small voltage

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Silicon diodes are preferred to germanium diodes because the reverse saturation current of silicon diodes is smaller than that of germanium.

Correct Option: C

Silicon diodes are preferred to germanium diodes because the reverse saturation current of silicon diodes is smaller than that of germanium.

A high T_c superconductor has the transition temperature around:

1. 400 K
1. 90 K
1. 20 K
1. 4 K

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NA

Correct Option: D

NA

The structures which have the highest packing of atoms are:

1. Hexagonal close packed lattice
1. Body centred cubic lattice
1. Simple cubic lattice
1. None of the above

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Hexagonal close packed lattice structures have the highest packing of atoms.

Correct Option: A

Hexagonal close packed lattice structures have the highest packing of atoms.

The junction current in a zero biased PN junction, at equilibrium is:

1. due to diffusion of minority carriers
1. due to diffusion of majority carriers
1. due to equal and opposite carriers crossing PN junction
1. zero, because no carrier is able to cross the junction barrier

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The junction current in a zero biased PN junction, at equilibrium is zero, because no carrier is able to cross the junction barrier.

Correct Option: D

The junction current in a zero biased PN junction, at equilibrium is zero, because no carrier is able to cross the junction barrier.

The depletion layer due to PN asymmetric junction:

1. penetrates more into N-region if P content is more
1. penetrates more into P-region if P content is more
1. penetrate equally into both the regions
1. none of these

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The depletion layer due to PN asymmetric junction penetrates more into N-region if P content is more.

Correct Option: A

The depletion layer due to PN asymmetric junction penetrates more into N-region if P content is more.