communication lab Daily Viva 2023

 For a PLL IC 565 with timing resistor & timing capacitor of about 15 kΩ & 0.02μF respectively, what would be the value of output frequency (f₀)?

• 433.33 Hz

• 833.33 Hz

• 1000 Hz

• 2500 Hz

 In PLL, the capture range is always _________the lock range.

• greater than

• less than

• equal to

• none of the above

A 100MHz carrier is frequency modulated by 10 KHz wave. For a frequency deviation of 500 kHz, calculate the modulation index of the FM signal.

• 100

• 50

• 70

• 90

The demodulation of a delta modulated signal can be achieved by:

• integration

• differentiation

• bandpass filtering

• sampling

For the signal constellation shown in the figure, the modulation scheme is

• BPSK

• BFSK

• QPSK

• QFSK

The bit rate of digital communication system is 34 Mbps. The Baud rate in QPSK modulation techniques will be:

• 8.5Mbps

• 17Mbps

• 136 Mbps

• 68Mbps

For a QPSK system, the theoretical BER is given by the equation:

A scheme in which ‘1’ is representing by a +ve pulse for a half of symbol duration, and a -ve. pulse for remaining half of the symbol and for ‘0’ the order is inverted is identified as

• NRZ polar

• RZ polar

• Manchester coding

• none of the above

• 
• 
• 
• 

The sequence of operations in which PCM is done is

• Quantizing, encoding, sampling

• Sampling, quantizing, encoding

• Quantizing, sampling, encoding

• None of the above