Class 2 (2nd Engineer) MET 📅 Nov 2025

Exam Question

(a) Compare the effectiveness of a current limiting circuit breaker with that of a HRC fuse (6)

(b) Evaluate for a frequency of 15 kHz, the amplification and the phase difference between input and output signals of a voltage amplifier using a triode having an amplification factor of 48 and an mutual conductance of 1.2 mA/V with an anode-load resistant of 160 KΩ. The output p.d. is fed by a coupling capacitor of negligible reactance to a subsequent circuit of resistance 480 KΩ and the total shunt capacitance is 90μ F. (10)

Reference Answer

(a) Both Current Limiting Circuit Breakers (CLCBs) and High Rupturing Capacity (HRC) fuses are protective devices designed to interrupt fault currents and limit damage in electrical systems. Their effectiveness can be compared as follows:
Feature
Current Limiting Circuit Breaker (CLCB)
High Rupturing Capacity (HRC) Fuse

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