Computer Programming MCQs

5739 MCQs  (Page 251 of 574)

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Which of the following are non-conductors of electricity?
A. Non-metal solids except carbon
B. Air and most other gases
C. Pure water and liquids in general except mercury
D. All of the above
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Carbon resistors are used extensively because they are____________?
A. Easy to make
B. Compact
C. Inexpensive
D. All of the above reasons
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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
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Due to which of the following factors the brush wear rate is altered ?
A. speed of the machine
B. contact pressure
C. surface conditions of brush and commutator
D. excessive sparking
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Carbon bearings are used under which of the following conditions ?
A. Where lubrication is difficult or im-possible
B. Where corrosive chemical action exists
C. Where high temperature exists
D. All of the above
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Steel wire is used as____________?
A. Overhead telephone wire
B. Earth wire
C. Core wire of acsr
D. All of the above
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Platinum is used in_____________?
A. electrical contacts
B. thermocouple
C. heating element in high temperature furnace
D. grids of special purpose vacuum tubes
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Which of the following high resistance materials has the highest operating temperature ?
A. Kanthal
B. Manganin
C. Nichrome
D. Eureka
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Low resistivity materials are used in__________?
A. Transformer, motor and generator windings
B. Transmission and distribution lines
C. House wiring
D. All above applications
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Which of the following materials is used for making coils of standard resistances ?
A. Copper
B. Nichrome
C. Platinum
D. Manganin
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Word of the Day
23 Jul
Aisle
a passage between rows of seats in a building such as a church or theatre, an aircraft, or train.
طویل تنگ راستہ، نشتوں کے درمیان راستہ

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