1) ASK modulated signal has the bandwidth a. Same as the bandwidth of baseband signal b. Half the bandwidth of baseband signal c. Double the bandwidth of baseband signal d. None of the above
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2) Coherent detection of binary ASK signal requires a. Phase synchronization b. Timing synchronization c. Amplitude synchronization d. Both a and b
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3) The probability of error of DPSK is ______________ than that of BPSK. a. Higher b. Lower c. Same d. Not predictable
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4) In Binary Phase Shift Keying system, the binary symbols 1 and 0 are represented by carrier with phase shift of a. Π/2 b. Π c. 2Π d. 0
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5) BPSK system modulates at the rate of a. 1 bit/ symbol b. 2 bit/ symbol c. 4 bit/ symbol d. None of the above
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6) The BPSK signal has +V volts and -V volts respectively to represent a. 1 and 0 logic levels b. 11 and 00 logic levels c. 10 and 01 logic levels d. 00 and 11 logic levels
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7) The binary waveform used to generate BPSK signal is encoded in a. Bipolar NRZ format b. Manchester coding c. Differential coding d. None of the above
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8) The bandwidth of BFSK is ______________ than BPSK. a. Lower b. Same c. Higher d. Not predictable
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9) In Binary FSK, mark and space respectively represent a. 1 and 0 b. 0 and 1 c. 11 and 00 d. 00 and 11
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10) The frequency shifts in the BFSK usually lies in the range a. 50 to 1000 Hz b. 100 to 2000 Hz c. 200 to 500 Hz d. 500 to 10 Hz
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11) The spectrum of BFSK may be viewed as the sum of a. Two ASK spectra b. Two PSK spectra c. Two FSK spectra d. None of the above
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12) The maximum bandwidth is occupied by a. ASK b. BPSK c. FSK d. None of the above
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13) QPSK is a modulation scheme where each symbol consists of a. 4 bits b. 2 bits c. 1 bits d. M number of bits, depending upon the requirement
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14) The data rate of QPSK is ___________ of BPSK. a. Thrice b. Four times c. Twice d. Same
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15) QPSK system uses a phase shift of a. Π b. Π/2 c. Π/4 d. 2Π
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16) Minimum shift keying is similar to a. Continuous phase frequency shift keying b. Binary phase shift keying c. Binary frequency shift keying d. QPSK
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17) In MSK, the difference between the higher and lower frequency is a. Same as the bit rate b. Half of the bit rate c. Twice of the bit rate d. Four time the bit rate
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18) The technique that may be used to reduce the side band power is a. MSK b. BPSK c. Gaussian minimum shift keying d. BFSK
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19) In DPSK technique, the technique used to encode bits is a. AMI b. Differential code c. Uni polar RZ format d. Manchester format
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20) Synchronization of signals is done using a. Pilot clock b. Extracting timing information from the received signal c. Transmitter and receiver connected to master timing source d. All of the above
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