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Ericsson Technical Test - 2006

Posted on :23-02-2016

Section 1 - Technical:-

Q1.  A PIN diode is

a) suitable for use as microwave switch
b) used as microwave detector
c) semiconductor point contact diode
d) microwave mixer diode


Q2. What is memory word addressing capability of 8085 mp?

a) 32k
b) 64k
c) 255k
d) 512 k


Q3. Highest voltage gain can be obtained from

a) CC
b) CE
c) CB
d) Both CE and CB


Q4. GSM channel bandwidth is

a) 200 mhz
b) 200 khz
c) 25 mhz.
d) 25 khz


Q5. 10 bit A/D converters, the quantization error in %-

a) 1
b) 2
c) 0.1
d) 0.2


Q6. Ideal value of VSWR:

a) zero
b) 1
c) 2
d) infinity


Q7. Telephone traffic is measured in

a) in terms of gos
b) erlang
c) with echo cancellers
d) none


Q8. Transistors are generally free from which of following type of noise?

a) Resistance noise
b) shot noise
c) flicker noise
d) partition noise


Q9. The VHF band is-

a) 30 hz-300hz
b) 300Hz-3Khz
c) 3Khz-30Khz
d) 30 Khz-300khz


Q10. Converter is a device used for transforming

a) AC to DC
b) DC to DC
c) DC to AC
d) AC to AC


Q11. Which type of fading cause serious distortion of modulated signal?

a) selective fading
b) interference fading
c) absorption fading
d) polarization fading


Q12. For satellite communication the frequency should be

a) less than fc
b) equal to critical freq of ionosphere
c) more than critical freq of ionosphere
d) none of these


Q13. The attenuation in wave guides near the cutoff frequency is-

a) Zero
b) Very Low
c) Medium High


Q14. D layer roughly extends from

a) 20 -50km
b) 55-90 km
c) upto 110 km
d) up to 50 km


Q15. Frequency of microwave is

a) 15khz
b) 15mhz
c) less than 2000 mhz
d) more than 2000 mhz


Q16. Which of following is digital?

a) pulse position modulation
b) pulse code modulation
c) pulse width modulation
d) pulse frequency modulation


Q17. As electromagnetic waves travel in space only one can happen

a) absorption
b) attenuation
c) reflection
d) refraction


Q18. When modulating freq. is doubled ,modulating index is halved and modulating voltage remains constant. The system is

a) AM
b) FM
c) Pm
d) any one


Q19. Companding is used

a) to protect small signal in PCM from quantization distortion
b) to overcome quantized noise in PCM
c) to overcome impulse noise
d) none of these


Q20. Balun is a transformer which changes

a) unbalanced to balanced line
b) balanced to unbalanced line
c) zero to infinite impedance
d) input like transformer


Q21. H plane tee is also

a) shunt t
b) series t
c) shunt series t
d) none


Q22. Anti side tone circuit in telephone is used to

a) amplify side tone
b) suppress side tone
c) eliminate side tone
d) attenuate side tone


Q23. Fading can be avoided by-

a) providing space diversity reception
b) providing AVC in receiver
d) All are possible


Q24. Efficiency of antenna increases in

a) ohmic resistance of antenna
b) radiation resistance of antenna
c) input reactance of antenna
d) all the above



Section -2 Computer network:-

Q25. What are the chips on which computer COM ports are based?

a) USB chip
b) UART
c) UNC
d) UDP


Q26. How two switch can be connected?

a) Straight cable
b) unleashed twisted pair cable
c) twisted pair cable
d) cross cable


Q27. What is smtp?

a) protocol on LAN
b) protocol for email over internet
c) protocol for retrieving email from server on LAN
d) software allows user view HTML documents


Q28. A protocol concerned with file transfer, management, and access is

a) MHS
b) FTAM
c) DS
d) CMIP


Q29. Primary rate interface of ISDN used in India correspond to

a) 2B+D16 structure at 192 Usps
b) 23B+D64 structure at 1.544Mbps
c) 30B+2D64 structure at 2.048Mbps
d) 23B+D64 structure at 1.544Mbps
e) 2B+D16 structure at 144Usps


Q30. Virtual switching is form of

a) datagram switching
b) message switching
c) packet switching
d) circuit switching


Q31. Two addresses required for communication

a) IP & logical addresses.
b) IP & physical addresses.
c) IP & MAC
d) IP & communicating addresses.


Q32. X.25  provides data link control using one of the following bit oriented protocol

a) LAP
b) LAP B
c)  LAP C
d) HDL C


Q33. Which type of connector is used in LAN cable?

a) RJ11
b) RJ40
c) RJ45
d) RJ 30


Q34. In OSI layer does FDDI protocol operate?

a) physical
b) data link
c) physical and datalink
d) network



  
   






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