Q1. The frequency range of THF
(A) 300 - 3000 GHz
(B) 30 - 300 KHz
(C) 300 - 3000 MHz
(D) 3 - 30 MHz

Q2. The frequency range of low frequncy signals
(A) 3 - 30 Hz
(B) 30 - 300 KHz
(C) 300 - 3000 MHz
(D) 3 - 30 MHz

Q3. The frequency range of super low frequency
(A) 3 - 30 Hz
(B) 30 - 300 Hz
(C) 300 - 3000 MHz
(D) 3 - 30 MHz

Q4. The frequency range of ELF signals
(A) 3 - 30 Hz
(B) 30 - 300 MHz
(C) 300 - 3000 MHz
(D) 3 - 30 MHz

Q5. which system used india for tv
(A) PAL
(B) DM
(C) FSK
(D) ASK

Q6. Quantization noise occur in
(A) pam
(B) ppm
(C) delta modulation
(D) None of these

Q7. Following type of multiplexing cannot be used for analog signalling
(A) FDM
(B) TDM
(C) CDMA
(D) None of the above

Q8. Most commonly used filters in SSB generation are
(A) mechanical
(B) RC
(C) LC
(D) LPF

Q9. The frequency modulated (FM) radio frequency range is nearly -
(A) 250 to 300 MHz
(B) 150 to 200 MHz
(C) 88 to 108 MHz
(D) 30-70 MHz

Q10. which of the following requires more power for transmission
(A) FM
(B) AM
(C) DSB-SC
(D) SSB-SC

Q11. Amplitude modulation contains
(A) USB
(B) USB and LSB
(C) USB,LSB and Carrier
(D) LSB

Q12. Which of the following is not possible in a digital (data) PBX using twisted pair transmission
(A) computer port concentration
(B) 64 kbps data circuits
(C) High-Speed file transfers
(D) transmission up to several thousand feet

Q13. The transmission signal coding method of T1 carrier is called
(A) Bipolar
(B) NRZ
(C) Manchester
(D) Binary

Q14. How many pairs of stations can simultaneously communicate on Ethernet LAN
(A) 1
(B) 2
(C) 3
(D) multiple

Q15. The data rate of the ISDN Basic access B channel is
(A) 32kbps
(B) 64kbps
(C) 192kbps
(D) 144kbps

Q16. For a wave propagation in a medium, identity the property that is independent of others
(A) Frequency
(B) Wavelength
(C) Velocity
(D) All of these

Q17. Class C amplifiers are used as
(A) Detectors
(B) AF amplifiers
(C) RF amplifiers
(D) None

Q18. The following circuit can not demodulate SSB:
(A) BFO
(B) Phase Discriminator
(C) Balanced modulator
(D) product detector

Q19. Which of the following parts of the sunlight makes the solar cooker hot?
(A) Ultraviolet
(B) Red light rays
(C) Infrared
(D) Cosmic rays

Q20. In order to get back the original signal, it is necessary to use:
(A) low pass filter
(B) high pass filter
(C) band pass filter
(D) band reject filter

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