ISRO Scientist or Engineer Electronics 2011

A PN junction in series with a 100 ohm resistor is forward biased so that a current of 100 mA flows. If voltage across the combination is instantaneously reversed to 10 V at time t = 0, the reverse current that flows through the junction at t= 0 is approximately given by.

Ripple factor for a half waverectifier is ......

........ is a primitive that can execute code. It contains an instruction pointer (=program counter) and sometimes has its own stack

If the $$\alpha$$ and $$\beta$$ are the roots of the equation $$x^{2} + px + q = 0$$, then $$\sum \alpha^{2}$$ is

A signal $$m_{1}$$ (t) is band limited to 3.6 kHz and the three other signals $$m_{2}(t), m_{3}(t)$$ and $$m_{4}(t)$$ are band limited to 1.2 kHz each, and these signals are transmitted by means of TDM. Then, what will be the transmission bandwidth of the channel.

For a 10 bit PCM system the signal to quantization noise ratio is 62dB. If the number of bits is increased by 2, then the signal to quantization noise ratio will

The modulation normally used with the digital data is

The critical angle $$\theta c$$ in an optical fiber is given by .............. Where $$n_1$$, is refractive index of medium 1 and $$n_2$$ is the refractive index of medium 2.

In a JK flip flop we have J = Q’ and K = 1. Assuming that the flip flop was initially cleared and clocked for 6 pulses, the sequence at the Q output will be

Which of the following system is linear