Class: XII
Operation And Maintenance Of Communication Devices-(789)
Sample Question Paper 2019-20

SECTION–A

Answer any 10 questions  out of the given 12 questions:
1. The frequency range of 300KHz to 3000KHz is known as
(a) Low frequency
(b) Medium frequency
(c) High Frequency
(d) Very High frequency
 
2. Noise is added to a signal in a communication system
(a) At the receiving end
(b) At transmitting end
(c) In the channel
(d) During regeneration of the information
 
3. A transponder is a satellite equipment which
(a) Receives the signal from earth station and amplifies it
(b) Changes the frequency of received signal
(c) Retransmits the received signal
(d) All of the above
 
4. The quality  of space link is measured in terms of_ ratio
(a) C/N
(b) S/N
(c) G/T
(d) EIRP
 
5. CDMA rejects
(a) Narrow band interference
(b) Wideband interference
(c) Both A and B
(d) None of the above.
 
6. Which type of PCB requires minimum soldering on component side in order to avoid replacement oriented difficulties ?
(a) Single sidedPCB
(b) Double sidedPCB
(c) Both a and b
(d) None of the above
 
7. Which of the following is not a virus in mobile phone ?
(a) Trojan Horse
(b) Fake android apps
(c) spyware
(d) Avast
 
8. The maximum allocated frequency deviation in FM is
(a) 10MHz
(b) 75MHz
(c) 100MHz
(d) 125MHz
 
9. In digital modulation
(a) Carrier Signal is digital and message signal is analog
(b) Message signal is digital and carrier signal is analog
(c) Both carrier and message signals are digital
(d) Both carrier and message signals are analog
 
10. WiFi stands for
(a) Wireless fidelity
(b) Wideband function
(c) wireless function
(d) None of the above.
 
11. IMT2000 is a digital mobile system that function as
(a) Pager
(b) Cordless
(c) Low earth orbit satellites
(d) All of theabove.
 
12. CDMA  offers
(a) Soft handoff
(b) Hard Handoff
(c) Hanofff varies from cell to cell
(d) None of the above

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