Radio Receivers C. 545 kHz D. 555 kHz 10. The sensitivity curve of a standard receiver is
represented by
1. The noise generated by a resistor depends upon 6. In a broadcast superheterodyne receiver
A. its resistance value A. the local oscillator operates below the signal
frequency
B. its operating temperature
B. local oscillator frequency is normally double the
C. both its resistance value and operating IF
temperature
C. RF amplifier normally works at kHz above the
D. none of the above carrier frequency
2. In a superheterodyne receiver D. mixer input must be tuned to the signal
A. the IF stage has better selectivity than RF stage frequency
B. the RF stage has better selectivity than IF stage 7. A duplexer is a device used to A. curve A B. curve B
C. the RF stage has same selectivity than IF stage A. feed more than one receiver from a single C. curve C D. curve D
antenna
D. none of the above 11. Which are the popular IF frequencies for
B. connect two transmitters to the same antenna microwave and radar receivers operating on
3. The function of an AM detector circuit is to frequencies in the range 1 to 10 GHz
C. connect a receiver and a transmitter to the
A. rectify the input signal same antenna A. 30, 60 and 70 kHz
B. discard the carrier D. none of these B. 3, 6 and 7 kHz
C. provide audio signal 8. A heterodyne frequency changer is called a C. 30, 60 and 70 MHz
D. all of the above A. Modulator D. 3, 6 and 7 GHz
4. Which of the following should be used in order B. Mixer 12. In a ratio detector
to prevent overloading or the last IF amplifier in a
receiver? C. Demodulator A. the linearity is worse than in a phase
D. Frequency translator discriminator
A. Variable selectivity
9. RF amplifiers are used in radio receivers for B. the output is twice that obtainable from a
B. Variable sensitivity similar phase discriminator
A. improved image frequency rejection
C. Double conversion C. stabilization against signal strength variations is
D. Squelch B. improved rejection of adjacent unwanted signals provided
C. prevention of re-radiation of the local oscillator D. the circuit is the same as in a discriminator,
5. Most popular IF for receivers tuning to 540 to
1650 kHz is through the antenna of the receiver except that the diodes are reversed
D. all of the above
A. 433 kHz B. 455 kHz
represented by
1. The noise generated by a resistor depends upon 6. In a broadcast superheterodyne receiver
A. its resistance value A. the local oscillator operates below the signal
frequency
B. its operating temperature
B. local oscillator frequency is normally double the
C. both its resistance value and operating IF
temperature
C. RF amplifier normally works at kHz above the
D. none of the above carrier frequency
2. In a superheterodyne receiver D. mixer input must be tuned to the signal
A. the IF stage has better selectivity than RF stage frequency
B. the RF stage has better selectivity than IF stage 7. A duplexer is a device used to A. curve A B. curve B
C. the RF stage has same selectivity than IF stage A. feed more than one receiver from a single C. curve C D. curve D
antenna
D. none of the above 11. Which are the popular IF frequencies for
B. connect two transmitters to the same antenna microwave and radar receivers operating on
3. The function of an AM detector circuit is to frequencies in the range 1 to 10 GHz
C. connect a receiver and a transmitter to the
A. rectify the input signal same antenna A. 30, 60 and 70 kHz
B. discard the carrier D. none of these B. 3, 6 and 7 kHz
C. provide audio signal 8. A heterodyne frequency changer is called a C. 30, 60 and 70 MHz
D. all of the above A. Modulator D. 3, 6 and 7 GHz
4. Which of the following should be used in order B. Mixer 12. In a ratio detector
to prevent overloading or the last IF amplifier in a
receiver? C. Demodulator A. the linearity is worse than in a phase
D. Frequency translator discriminator
A. Variable selectivity
9. RF amplifiers are used in radio receivers for B. the output is twice that obtainable from a
B. Variable sensitivity similar phase discriminator
A. improved image frequency rejection
C. Double conversion C. stabilization against signal strength variations is
D. Squelch B. improved rejection of adjacent unwanted signals provided
C. prevention of re-radiation of the local oscillator D. the circuit is the same as in a discriminator,
5. Most popular IF for receivers tuning to 540 to
1650 kHz is through the antenna of the receiver except that the diodes are reversed
D. all of the above
A. 433 kHz B. 455 kHz
