BSNL JTO Recruitment Test Paper Pattern Set 3

1. The 2’s complement of 10002 is –
a) 0111
b) 0101
c) 1000
d) 0001

2. Master slave flip-flop is made up of –
a) two flip flops connected in series
b) two flip flops connected in parallel
c) a debouncer circuit
d) a-D- latch

3. Number of nybbles making one byte is –
a) 2
b) 4
c) 8
d) 16

4. Negative dB gain margin System stability requirements would include
a) 1 and 3
b) 1, 2 and 3
c) 1 and 4
d) 2, 3 and 4

4. The intrinsic impedance of free space-
a) is independent of frequency
b) decreases with increase of frequency
c) increases with increase of frequency
d) varies as square root of frequency

5. A system consists of 12 poles and 2 zeroes. Its high frequency asymptote in its magnitude plot has a slope of –
a) –200 dB/decade
b) –240 dB/decade
c) –230 dB/decade
d) –320 dB/decade

6. Considering the conditions-
1. High loop gain 
2. Less ringing
3. Greater damping

7. In the equatorial plane only Geosychronous satellite are launched because it is the only plane which provides –
a) 24 hour orbit
b) stationary satellite
c) global communication
d) zero-gravity environs

8. Radio Broadcasting is an example of –
a) space multiplexing
b) time multiplexing
c) frequency multiplexing
d) none of the above

9. PAM signals can be demodulation by using a –
a) Low pass filters (LPE) alone
b) A Schmitt trigger followed by a LPF
c) A differentiator followed by a LPF
d) A clipper circuit by a LPF

10. In an FDM receiver channels can be separated by using –
a) AND gates
b) Band pass
c) differentiation
d) Integration

11. The most common modulation system used for telegraphy is-
a) frequency shift keying
b) two – tone modulation
c) pulse code modulation
d) single tone modulation

12. Use of varoctor diode in generation of modulated segial be-
a) FM generation only
b) 100AM generation only
c) PM generation only
d) both PM and AM generation

13. In colour picture tube shadow mask is used to-
a) reduce x-ray emission
b) ensure that each beam strikes only its own dots
c) increase screen brightness
d) provide degaussing for the screen

14. The circuit that separates composite video warefore from the sync pulses is-
a) the keyed AGC amplifar
b) a clipper
c) an integrator

d) a sawtooth current
15. Band width of microwaves is-
a) 1GHz -103 GHz
b) 1GHz –100 GHz
c) 1 GHz –10 GHz
d) 1 GHz – 106 GHz

16. In transverse Magnetic mode-
a) no electric line is in direction of propagation
b) no magnetic line is in direction of propagation
c) bath magnetic & electric lines are is direction of propagation
d) neither magnetic nor electric lines in direction of propagation

17. Signal transmission in sky wave propagation is due to –
a) Reforction of wave
b) Reflection of wave
c) Pierus through Inosphere
d) None

18. According to Barkhausen Criterion Phase shift of signal should be –
a) 600
b) 900
c) 1800
d) 3600

19. The transmission does not have –
a) Partition noise
b) Flicker noise
c) resistance
d) Short noise

20. Varoctor diode has non linearity of –
a) capacitance
b) Inductance
c) Resistance
d) Is a linear device

21. Noise figure is calculated as –
a) i/p signal to noise ratio X o/p signal to noise ratio
b) i/p S/N Ratio / O/P S/N Ratio
c) i/p S/N Ratio / O/P S/N Ratio X 100
d) i/p S/N Ratio + O/P S/N Ratio

22. You can determine quickly the effect of adding poles and zeros by –
a) Nicholas chart
b) Nyquist plot
c) Bode plot
d) Root locus.

23. The polar plot of G(S) = intercepts real axis at w = wo. Then, the real part and wo are given by-
a) –5, 1
b) –2.5, 1
c) –5,0-5
d) –5, 2

24. Laplace transform F (s) of a function f (E) is given by The initial and final values of F (t) will be respectively-
a) zero and 1
b) zero and 10
c) 10 and zero
d) 70 and 80

25. A satellite link uses different frequencies for receiving and transmitting in order to –
a) avoid interference from terrestrial microwave links
b) avoid interference between its powerful transmitted signals and weak in coming signal
c) minimize free-space losses
d) maximize antenna gain

26. The first determining factor in selecting a satellite system is its-
a) EIRP
b) Antenna size
c) Coverage area
d) Antenna gain

27. Equalizing pulses in TV are sent during-

a) horizontal blanking
b) vertical blanking
c) the serrations
d) the horizontal retrace

28. The son seems to have ——– from his father a somewhat gloomy and moody manner-
a) washed
b) inherited
c) admired
d) attempt

29. Essayist works with words as sculptor with-
a) water
b) stone
c) air
d) hills