The forbidden gap in an insulator is________________?
The forbidden gap in an insulator is________________?
A. large
B. small
C. nil
D. any of the above
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Copper, even though costly, finds use in the windings of electrical machines because_____________?
Copper, even though costly, finds use in the windings of electrical machines because_____________?A. copper points offer low contact resistance
B. copper can be easily soldered and welded
E. copper windings are less bulky and the machines become compact
D. all of the aboveSuperconductivity is observed for____________?
Superconductivity is observed for____________?A. infrared frequencies
B. d.c. and low frequency
C. a.c. and high frequency
D. frequencies having no effect
E. none of the aboveDue to which of the following reasons copper and aluminium are not used for heating elements ?
Due to which of the following reasons copper and aluminium are not used for heating elements ?A. Both have great tendency for oxidation
B. Both have low melting point
C. Very large length of wires will be required
D. All of the aboveDue to which of the following factors the brush wear rate is altered ?
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
E. All of the aboveWhich of the following resistive materials has the lowest temperature co-efficient of resistance ?
Which of the following resistive materials has the lowest temperature co-efficient of resistance ?A. Nichrome
B. Constantan
C. Kanthal
D. MolybdenumWhich of the following materials does not have covalent bonds ?
Which of the following materials does not have covalent bonds ?A. Organic polymers
B. Silicon
C. Metals