Detection

Q.

In the given detector circuit, the suitable value of carrier frequency is

1. << 10⁹ Hz
2. None of these
3. << 10⁵ Hz
4. >> 10⁹ Hz

Q. A super heterodyne receiver is designed to receive transmitted signals between 5 and $10MHz$. The tuning range of the local oscillate for IF frequency $600kHz$ for high-side tuning would be

1. $5.6to10.6MHz$
2. $4.6to9.6MHz$
3. $4.6to10.6MHz$
4. $5.6to9.6MHz$

Q.

Can an oscilloscope measure voltage?

Q. The carrier frequency generated by a tank circuit containing $1nF$ capacitor and $10\mu H$ inductor is:

1. $1592Hz$
2. $1592MHz$
3. $1592kHz$
4. $159.2Hz$

Q. In the given block diagram of a receiver, identify the boxes labelled as $X$ and $Y$ and write their functions.

Q. Given below is the circuit diagram of an $AM$ demodulator
For good demodulation of $AM$ signal of carrier frequency $f$, the value of $RC$ should be

1. $RC=1/f$
2. $RC\ge 1/f$
3. $RC<1/f$
4. $RC>>1/f$

Q. In the following circuit, the frequency of A.C is increased then the value of the current flowing int he circuit will be:

1. zero
2. increases
3. Infinity
4. decreases

Q. $5beats/second$ are heard when a tuning fork is sounded with sonometer wire under tension, when the length of the sonometer wire is either $0.95m$ or $1m$. The frequency of the fork will be:

1. $195Hz$
2. $150Hz$
3. $300Hz$
4. $251Hz$