Thermonic emission occurs in______________?
Thermonic emission occurs in______________?
A. vacuum tubes
B. copper conductors
C. ferrite cores
D. transistors
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Carbon rods are used in wet and dry cells because_____________?
Carbon rods are used in wet and dry cells because_____________?A. carbon rod serves as conductor
B. carbon can resist the attack of battery acid
C. both (A) and (B)
D. either (A) or (B)Due 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 variety of copper has the best conductivity ?
Which of the following variety of copper has the best conductivity ?A. Induction hardened copper
B. Hard drawn copper
C. Pure annealed copper
D. Copper containing traces of siliconAt transition temperature the value of critical field is____________?
At transition temperature the value of critical field is____________?A. zero
B. negative real value
C. positive real value
D. complex valueWhich of the following is the poorest conductor of electricity ?
Which of the following is the poorest conductor of electricity ?A. Carbon
B. Steel
C. Silver
D. AluminiumConstantan contains_______________?
Constantan contains_______________?A. silver and tin
B. copper and tungsten
C. tungsten and silver
D. copper and nickel