Related Questions

Pulverised fuel fired furnaces employ __________ fuel firing.
A Horizontal
B Vertical
C Tangential
D All of the above
Trommels employ __________ for screening of materials.
A Fibrous cloth
B Woven wire screen
C Punched plate
D None of these
Cross linked polymers formed from bi-and trifuctional groups in which cross-linkage in three dimensions via few chemical bonding across linear chains occur imparts to the polymer __________ properties.
A Thermoplastic
B Thermosetting
C Elastometric
D Brittleness
When two semiconductors of p and n-type are brought in contact, they form p-n junction which acts like a/an
A Conductor
B Oscillator
C Rectifier
D Amplifier
The conduction of electricity, in semiconductors, takes place due to movement of
A Positive ions only
B Negative ions only
C Positive and negative ions
D Electrons and holes
Is an element used in semiconductors whose atoms have three valence electrons.
A An acceptor
B A donor
C Germanium
D Silicon
The impurity atoms is semiconductors
A Inject more charge carriers
B Reduce the energy gap
C Increase the kinetic energy of valence electrons
D All of the above
With rise in temperature the resistance of semiconductors
A Decreases
B Increases
C First increases and then decreases
D Remains constant
The impurity atoms with which silicon should be doped to make p-type semiconductors are
A Phosphorus
B Antimony
C Boron
D Germanium
With increase in temperature, the electrical conductivity of semiconductors
A Increases
B Decreases
C Remain constant
D Either A or B, depends on the type of semi-conductor

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