For the circuit shown in Fig. 2(c), calculate the resistance $R_o$ as seen by the output terminals. Ignore the effect of $R_1$ and $R_2$. Assume $\beta = 99$ and $h_{ie} = 1\text{ k}\Omega$. Comment on the value of $R_o$ of the circuit :

2Medium10 marks

The SCR shown in Fig. 5(c) has a $\frac{di}{dt}$ limit of $10\text{ A}/\mu\text{s}$. It is to be operated from a $100\text{ V}$ d.c. supply with load resistance $R = 50\text{ }\Omega$.

(i) What is the minimum value of load inductance $L$ that will protect the SCR?

(ii) If an $R_s C_s$ snubber is connected across the SCR with $R_s = 500\text{ }\Omega$, what will be the new value of load inductance $L$ to protect the SCR against $\frac{di}{dt}$?

3Medium20 marks

What are the different methods of testing of circuit breakers? Discuss their merits and demerits. Which method is more suitable for testing the circuit breakers of large capacity?

63 more Electrical Engineering 2016 questions await

Generate a full-length practice test on Electrical Engineering — pick the exact year, topic or chapter you want, and solve as many questions as you like with instant scoring and explanations.

Generate a Electrical Engineering Test

Electrical Engineering — All Years|All Subjects