BSNL JTO PREVIOUS YEAR PAPER SECTION-2
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BSNL JTO PREVIOUS YEAR PAPER SECTION-2

           1.A converter which can operate in both 3 pulse and 6 pulse modes is a--
            a.) 1 phase full converter 
b)  3 phase half wave converter
c)  3 phase semi converter 
d)  3 phase full converter  
2.A single phase CSI has capacitor C as the load. For a constant source current, the voltage across the capacitor is –  
a.) square wave 
b.) triangular wave 
c ) step function 
d.)  pulsed wave 
3.A single phase full wave midpoint thyristor converter uses a 230/200V transformer with centre tap on the secondary side. The P.I.V per thyristor is –  
a) 100V 
b) 141.4V 
c)  200V 
d) 282.8V 
4.In dc choppers for chopping period T, the output voltage can be controlled by FM by varying –  
a) T keeping Ton constant 
b) Ton keeping T constant 
c) Toff keeping T constant 
d.) None of the above 
5.From the hot metal surface electrons escape because  
a) of change of state from metal to gas due to heat. 
b) of change of stats from gas to metal. 
c) the energy supplied is greater than the work function . 
d)  the energy is greater than Fermi level. 
6.The most common device used for detection in radio receivers is –  
a) amplifier 
b)  triode 
c)  diode 
d)  transistor 
7.In a full wave rectifier the negative point in a circuit is  
a) Either cathode 
b) Either anode 
c) The central tap on the high voltage secondary 
d) Either plate 
8.Negative feedback amplifier has a signal corrupted by noise as its input. The amplifier will-  
a) Amplify the noise as much as the signal 
b) Reduce the noise 
c) Increase the noise 
d)  Not effect the noise 
9..Match the given feedback circuit with it’s proper nomenclatures 
            a) Current  series feedback
b) Current shunt feedback    c) Voltage series feedback    d) Voltage shunt feedback 
10.Class A amplifier is used when   a)No phase inversion is required  b) Highest voltage gain is required c) dc voltages are to be amplified  d) Minimum distortion is desired 
11.Identify the correct match for the given transistor 
a).Enhancement type P channel MOSFET    b)  Depletion type N channel MOSFET   c)  Enhancement type N channel MOSFET d)  Depletion type P channel MOSFET 
12.In case a signal band limited to fm is sampled at a rate less than 2fm, the constructed signal will be   a) Distortionless   b) Small in amplitude   c)  Having higher frequencies suppressed  d)  Distorted 
13.Quad 2 input AND gates IC No is –   a) 7411  b) 7404   c) 7400   d)  7408 
14.Registers in which data is entered or taken out in serial form are referred as –   a) left shift register    b) right shift register      c) shift registers      d) none of the above 
15.An ideal power supply consist of –     a) Very small output resistance     b) Zero internal resistance      c) Very large input resistance      d) Very large output resistance 
           16.Register and counters are similar in the sense that they both –
a)count pulses    b) store binary operation   c) shift registers      d) made from an array of flip flops and gates integrated on a single chip 
17.In the 8421 BCD code the decimal number 125 is written as –       a) 1111101   b) 0001 0010 0101    c) 7D      d)  None of the above 
18.In D/A converter, the resolution required is 50mv and the total maximum input is 10v. The number of bits required is –      a) 7      b)  8    c)  9      d) 200 
19.On differentiation unit impulse function results in --     a) Unit parabolic function.    b) Unit triplet.    c) Unit doublet.      d) Unit ramp function. 
20.Read the following;   i. Routh Hermitz`s criterion is in time domain.   ii. Root locus plot is in time domain. iii. Bode plot is in frequency domain.       iv. Nyquist criterion is in frequency domain.     a) 2, 3, and 4 are correct      b)  1, 2 and 3 are correct      c)  3 and 4 are correct      d) All four are correct. 
21.The maximum phase shift that can be provided by a lead compensator with transfer function.     G(S)=(1+6S)/ (1+2S)     a) 150    b) 450    c)300   d)600  
 22. The correct sequence of steps required to improve system stability is –     a) Insert derivative action, use negative feedback, reduce gain.    b) Reduce gain, use negative feedback, insert derivative action. 
c) Reduce gain, insert derivative action, use negative feedback
d)Use negative feedback, reduce gain, insert derivative action. 
 
23Identity slope change at w = 10 of the magnitude v/s frequency characteristic of a unity feedback system with the following open-loop transfer function – 
 
a)40dB/dec to –20dB/dec     b) 40dB/dec to 20dB/dec     c)–20dB/dec to –40dB/dec   d). 40dB/dec to –20dB/dec 
24. In the feedback control system the loop transfer function is given by – 
G(S)H(S)=K/S(S+2)(S^2+2S+2) 
Number of asymptotes of its root loci is  
a)1 
b)2 
c)3 
d)4     25.  Considering the following statement :
      In a magic tee
1. the collinear arms are isolated from each other
2. one of the collinear is isolated from the E-arm
3. one of the collinear  arm is isolated from the H-arm
4. E-arm and H-arm are isolated from each other.
Of  these statements
a) 1 and 2 are correct
b) 1 and 3 are correct
c) 1 and 4 are correct
 d) 2 and 3 are correct  
26  In 1965 first geostationary satellite was launched called -
a) ANIK
b) EARLY BIRD (Intel sat -1)
c) WESTAR
d) MOLNIYA
27.      --- watt of power is received from sun per m2 surface area  of a  geosynchronous  satellite
a) 100
b)  500
c) 2000
d) 1000
28.The ripple factor in an LC filter
a)  Increases with the load current
b) Increases with the load resistance
c) Remains constant with the load current
d)  Has the lowest value
29 In different parts of the country identical telephone numbers are distinguished by their –
a)  Language digits
b)  Access digits
c) Area codes
d) Central office codes
30.Amplitude modulation is used for broadcasting because
a)  it is move noise immune than other modulation systems
b)  compared with other systems it requires less transmitting power
c)  its use avoids receiver complexity
d) no other modulation system can provide the necessary bandwidth for high fidelity
31.The amplifiers following the modulated stage in a low level modulation AM system be
a) linear amplifier
b) harmonic generators
c) class C power amplifiers
d) class B untuned  amplifiers
.32.In a radar system maximum unambiguous range depends on
a) maximum power of the transmitter
b) pulse repetition frequency
c) width of the transmitted pulse
d) sensitivity of the radar receiver
33. In composite video waveform the function of the serrations, is to
a) equalize the charge in the integrator before the start of vertical retrace.
b)  help vertical synchronization
c) help horizontal synchronization.
d) simplify the generation of the vertical sync pulse
34..The frequency range 30MHz – 300MHz is –
a)  medium frequency
b)  very high frequency
c)  super high frequency
d) Infrared  frequency
35.Which wave cannot exist inside wave guide –
a.) TE
b) TM
c) TEM
d) HE
36.Ionosphere layer of earth is situated at –
a) upto 18kms from earth
b)  from 18 to 70 km
c) 70 to 500 km
d)above 500 km
37.A two cavity klystron tube is a –
a)  velocity modulated tube
b)  frequency modulated tube
c) Amplitude modulated tube
d) simple triode
38.As the thermal noise get doubled due to the increase in a resistance the noise power get –
a) doubled
b) quadrupted
c) unchanged
d) halved  
39.   Which one is a cross field tube –  
a) Klystron 
b) Reflex Klystron 
c.) Magnetron 
d.) TWT 
40.The degree of coupling depends on –  
a) size of hole 
b)  location of holes 
c) size and location of holes 
d) not depend on size or location of hole 
 41.The thermal noise depends on –  
a)direct current through device 
b) resistive component of  resistance 
c)reactive component of impedance 
d.)load to connected 
42.In a radio receiver the IF amplifier  
a.) is tuned above the stations incoming frequency 
b) amplifies the output of local oscillator 
c)  is fixed tuned to one particular frequency 
d) can be tuned to various isolate frequencies 
43.   A duplexer is used to  
a) couple two antennas to a transmitter without interference  
b ) isolate the antenna from the local oscillator  
c) prevent interference between two antennas connected to a receiver  
d) use an antenna for reception or transmission without interference  
44.Intel's 8085 microprocessor chip contains  
a) seven 8 bit registers 
b) 8 seven bits registers 
c)seven 7 
d)eight 8 
45.Boolean algebra is based on –  
a). numbers 
b). logic 
c). truth 
d). symbols 
46.  When A = 0, B = 0, C = 1 then in 2 input logic gate we get - - gate  
a) XOR 
b)  AND 
c)  NAND             
d)  NOR

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