In modern household wiring, a 'fuse' has largely been replaced by which device that performs the same safety function but can be reset? MCQ with Answer and Explanation
In modern household wiring, a 'fuse' has largely been replaced by which device that performs the same safety function but can be reset?
A. MCB (Miniature Circuit Breaker)
B. Capacitor
C. Inverter
D. Rectifier
Answer: Option A
Solution (By JKSSB Mock Tests)
A Miniature Circuit Breaker (MCB) serves the same safety function as a fuse: breaking the circuit during an overload or short circuit. However, unlike a fuse wire that melts and must be physically replaced, an MCB contains an electromechanical mechanism that trips the switch. It can simply be switched back on to restore power.
Explanation:
T = 2π√(L/g). For small amplitudes, period independent of amplitude and mass. Depends only on effective length and acceleration due to gravity. Used in pendulum clocks.
Explanation:
BJT common-emitter current gain β typically 20-200. Small base current controls larger collector current. Memory aid: 'β = collector/base current ratio; value 20-200 for standard transistors'. Electronics parameter frequently tested in competitive exams.
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