Electronics and Communication Engineering - Networks Analysis and Synthesis

36.
An RLC series circuit has Q = 100 and ω0 = 20 rad/sec. The bandwidth is
0.2 rad/sec
2 rad/sec
20 rad/sec
2000 rad/sec
Answer: Option
Explanation:


37.
For making a capacitor, the dielectric should have
high ∈r
low ∈r
r = 1
r neither too high nor too low
Answer: Option
Explanation:

A high ∈r will lead to high value of capacitance.


38.
In an unloaded transformer, the fluxes limiting the primary and secondary are 30 mWb and 20 mWb. The coefficient of coupling is
1
0.1
0.33
0.67
Answer: Option
Explanation:

Φ11 = (1 - k) Φ1 φ11 = φ1 - φ2

30 - 20 10 mWb

10 mWb = (1 - k) 30m 0.33 = 1 - k k = 0.67 .


39.
Heat in calories = I2Rt/4.186.
True
False
Answer: Option
Explanation:

Calories and joules are related by mechanical equivalent of heat which is 4.186 .


40.
Poles and zeros of a driving point function of a network are simple and alternate on jω axis. The network consists of
R and C
L and C
R and L
R, L and C
Answer: Option
Explanation:

In network having only L and C, poles and zeros of driving point function are simple and alternate on jω axis.