Radio Receivers

1.The noise generated by a resistor depends upon

its resistance value its operating temperature both its resistance value and operating temperature none of the above

2.In a superheterodyne receiver

the IF stage has better selectivity than RF stage the RF stage has better selectivity than IF stage the RF stage has same selectivity than IF stage none of the above

3.The function of an AM detector circuit is to

rectify the input signal discard the carrier provide audio signal all of the above

4.Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver?

Variable selectivity Variable sensitivity Double conversion Squelch

5.Most popular IF for receivers tuning to 540 to 1650 kHz is

433 kHz 455 kHz 545 kHz 555 kHz