ISRO Scientist or Engineer Electronics 2013
For the following questions answer them individually
ISRO Scientist or Engineer Electronics 2013 - Question 71
A pulse signal having 100 kHz frequency and 70 nsec rise time is to be measured on an oscilloscope. The minimum required bandwidth of the oscilloscope is,
ISRO Scientist or Engineer Electronics 2013 - Question 72
Multiple collectors are used in Traveling Wave Tube (TWT)to:
ISRO Scientist or Engineer Electronics 2013 - Question 73
A lossless antenna has directional gain $$ G(\theta,\psi)$$, then $$\int_{\psi = -\frac{\pi}{2}}^{\psi = \frac{\pi}{2}}$$ $$\int_{\theta = -\frac{\pi}{2}}^{\theta = \frac{\pi}{2}} G(\theta, \psi)d \theta d \psi$$ is:
ISRO Scientist or Engineer Electronics 2013 - Question 74
$$\sqrt[3]{\cos x - j \sin x}$$ is equal to
ISRO Scientist or Engineer Electronics 2013 - Question 75
If f(t) is 1 MHz sinusoid with 1 Vp - p and sampling frequency fs is 25 KHz, the output will be:
ISRO Scientist or Engineer Electronics 2013 - Question 76
For a practical low pass filter, the ideal amplitude and phase response will be:
ISRO Scientist or Engineer Electronics 2013 - Question 77
A 10dB attenuator is put at the input of a low noise amplifier having 3dB noise figure. Now the noise figure of the cascaded amplifier will be.
ISRO Scientist or Engineer Electronics 2013 - Question 78
A 33.33% duty cycle rectangular wave is fed to the input of an Spectrum Analyzer. What will be observed?
ISRO Scientist or Engineer Electronics 2013 - Question 79
Phase function of a filter is $$(f) = kf^2,k > 0$$. The group delay of the filter has the shape
ISRO Scientist or Engineer Electronics 2013 - Question 80
1Vp-p sinusoid is digitized by a 4 bit A-to-D converter with input dynamic range of 2 Vp-p. The signal to noise ratio of the digitized signal is:
