ISRO Scientist or Engineer Electronics 2009
For the following questions answer them individually
ISRO Scientist or Engineer Electronics 2009 - Question 71
The Q of RLC tuned circuit with source voltage V in the figure is 100 at resonant freuquency of 100 KHZ What is the voltage $$V_{L}$$ across inductor at resonance ?
ISRO Scientist or Engineer Electronics 2009 - Question 72
A 5 V reference is drawn from the circuit shown in the figure. Zener diode of 400 mW and 5V with firing current of 5 mA is used. The value of $$R_{s}$$ is
ISRO Scientist or Engineer Electronics 2009 - Question 73
Find the equivalent resistance 200 Q R for the network shown in the figure.
ISRO Scientist or Engineer Electronics 2009 - Question 74
The Voltage across last resistor is V. All resistors are unity. Then $$V_{s}$$ is given by
ISRO Scientist or Engineer Electronics 2009 - Question 75
Natural frequency of a unity feedback control system of transfer function G(s)=$$\frac{10}{s(s+1)}$$
ISRO Scientist or Engineer Electronics 2009 - Question 76
Which ofthe following conditions will not guarantee a distortionless transmission line?
ISRO Scientist or Engineer Electronics 2009 - Question 77
For a line of characteristic impedance $$Z_{o}$$ terminated in a load $$Z_{R}$$ such that $$Z_{R} > Z_{0}$$, the Voltage Standing Wave Ratio (VSWR)is given by
ISRO Scientist or Engineer Electronics 2009 - Question 78
The beam width of a reflector antenna of diameter = 70 cm at 30 GHz is
ISRO Scientist or Engineer Electronics 2009 - Question 79
$$T_{r} = \frac{r}{1+r^{2} + r^{4}}$$
$$\sum_1^ \infty T_{r} = $$
ISRO Scientist or Engineer Electronics 2009 - Question 80
A man with n keys wants to open a lock. He tries his keys at random. The expected number of attempts for his success is (keys are replaced after every attempt)
