ISRO Scientist or Engineer Electronics May 2017

The electric field of a plane wave propagating in a lossless non-magnetic medium is given by the following equation $$\overrightarrow{E} (Z,t)= \cos (2 \pi \times 10^{9} t+\beta Z)\hat{a_{x}}+2 \cos (2 \pi \times 10^{9} t +\beta Z+\frac{\pi}{2}) \hat{a_{y}}$$ The type of wave polarization is

A ring of radius R carries a linear charge density $$\lambda$$ . It is rotating with angular speed $$\omega$$ . The magnetic field at its center is

A transmission line with a characteristic impedance of 100 Ω is used to match a 50 Ω section to a 200 Ω section. If the matching is to be done both at 500 MHz and 1.2 GHz, the length of the transmission line can be approximately,

System has some poles lying on imaginary axis is

The open-loop DC gain of a unity negative feedback system with closed loop transfer function $$\frac{(S+4)}{(S2+7S+13)}$$ is

The unit impulse response of a system is h(t)=e^{-t}, t>0 For this system, the steady-state value of the output for unit step input is equal to

A system has fourteen poles and two zeros. Its high frequency asymptote in its magnitude plot having a slope of

Consider a unity feedback system having an open loop transfer function $$G(j \omega)=\frac{K}{j \omega(j0.2 \omega +1)(j0.05 \omega+1)}$$ Find open loop gain (k) with gain margin of 20 dB

The open loop transfer function of a unity feedback system is G(S)=$$\frac{K}{S(S^{2}+S+2)(S+3)}$$ The range of K for which the system is stable is

For the CE (Common emitter) circuit shown, what will be the value of $$I_{E}$$ and $$V_{CE}$$?