Question: If Amin = 40 and Amax = 60, what is the percentage of modulation?

• 1. 20 %
• 2. 40 %
• 3. 50 %
• 4. 10 %

Question: In a radio receiver, we generally use ………….. oscillator as a local oscillator.

• 1. Crystal
• 2. Wien-bridge
• 3. Phase-shift
• 4. Hartley

Question: A 50 kW carrier is to be amplitude modulated to a level of 85%. What is the carrier power after modulation ?

• 1. 50 kW
• 2. 5 kW
• 3. 8 kW
• 4. 25 kW

Question: As the modulation level is increased, the carrier power__________________?

• 1. Is increased
• 2. Remains the same
• 3. Is decreased
• 4. None of the above

Question: A high Q tuned circuit will permit an amplifier to have high __________________?

• 1. Fidelity
• 2. Frequency range
• 3. Sensitivity
• 4. Selectivity

Question: Man made noise are______________ variations?

• 1. Amplitude
• 2. Frequency
• 3. Phase
• 4. Both phase and frequency

Question: If level of modulation is increased ______________ power is increased?

• 1. Carrier
• 2. Sideband
• 3. Carrier as well as sideband
• 4. None of the above

Question: Demodulation is done in ________________?

• 1. Receiving antenna
• 2. Transmitter
• 3. Radio receiver
• 4. Transmitting antenna

Question: In radio transmission, the medium of transmission is ________________?

• 1. Space
• 2. An antenna
• 3. Cable
• 4. None of the above

Question: In TV transmission, picture signal is ______________ modulated?

• 1. Frequency
• 2. Phase
• 3. Amplitude
• 4. None of the above