BEL is expected to have recruitment drive soon. As the number of aspirants are in large numbers . We are posting some of the previously appeared questions. (only technical)
These were some of the topics given in 2010.
1. Antennas: Antenna lenths, types(vhf,uhf,yogi-gudi n other)
2. Satellites: Basics on Satillites, Satillite positions, Distance problems, Geo-synchronous Satillites
3. Radar : Basics on Raders, Tracking Raders, FW-CM Raders, MTI Raders
4. Microprocessors: 80286, Data n Adders lines(1-2 qns)
5. Networks : Resonance Frequency, Y-Delta problems, Nodal n Mesh Analysis, RLC n/w, power Calculations(p=v^2/R=I^2R=VI)
6. Control Systems : Transfer Function, Routh-Hurwitz Crierion
7. Op-amps : R and C connected op-amp o/p
8. Timers: IC(4000,4001,7485)
9. Capacitance n Inductance Formulas and its problems,Conductivity
10. Basic Electronics: p-n junction, FET, Oscillators, no.of electrons(germanium,silicon,arsenic,antinmoni remaining also....)
11. Electromagnitics : m(mue),mr, Maxwell,s equation, J= (Sigma)*E, Divergence, Wave guides.
12. 1-5 qns from Basics of normal operating systems(windows,unix,win98) n Control Networking
13. Digital Electronics : Flip-flops(j-k,T,D), Logic Gates
14.Communications : Detectors,S/N ratio.
Some of the questions:
1 . A Zener diode works on the principle of
ans: Tunneling of charge carriers across the jn.
(ii)I/O devices are accessed using IN and OUT instructions.
(iii)there can be a max of 256 input devices and 256 output devices.
(iv) airthmetic and logic operations can be directly performed with the I/Odata.
ans : (iv)
(ii) increased with increase in doping levels of the two sides.
(iii) increase with the increase in temp.
(iv) all the above.
ans : (iv)
14. Rsistivity ofGermanium in ohms cm. is approx. equal to
a. 50 b. 10-12 c. 50k d. 10-6
15. The number of free electrons/cubic cm intrinsic Germanium at room temperature is approx. equal to
a. 1.5*1010 b. 2.5*1013 c. 1000 d. 5*106
These were some of the topics given in 2010.
1. Antennas: Antenna lenths, types(vhf,uhf,yogi-gudi n other)
2. Satellites: Basics on Satillites, Satillite positions, Distance problems, Geo-synchronous Satillites
3. Radar : Basics on Raders, Tracking Raders, FW-CM Raders, MTI Raders
4. Microprocessors: 80286, Data n Adders lines(1-2 qns)
5. Networks : Resonance Frequency, Y-Delta problems, Nodal n Mesh Analysis, RLC n/w, power Calculations(p=v^2/R=I^2R=VI)
6. Control Systems : Transfer Function, Routh-Hurwitz Crierion
7. Op-amps : R and C connected op-amp o/p
8. Timers: IC(4000,4001,7485)
9. Capacitance n Inductance Formulas and its problems,Conductivity
10. Basic Electronics: p-n junction, FET, Oscillators, no.of electrons(germanium,silicon,arsenic,antinmoni remaining also....)
11. Electromagnitics : m(mue),mr, Maxwell,s equation, J= (Sigma)*E, Divergence, Wave guides.
12. 1-5 qns from Basics of normal operating systems(windows,unix,win98) n Control Networking
13. Digital Electronics : Flip-flops(j-k,T,D), Logic Gates
14.Communications : Detectors,S/N ratio.
Some of the questions:
1 . A Zener diode works on the principle of
ans: Tunneling of charge carriers across the jn.
2. in an 8085,microprocessor system with memory mapped I/O:
(i) I/O device have 8-bit addresses.(ii)I/O devices are accessed using IN and OUT instructions.
(iii)there can be a max of 256 input devices and 256 output devices.
(iv) airthmetic and logic operations can be directly performed with the I/Odata.
ans : (iv)
3. built-in potential in a p-n jn.-
(i) is equal to the difference in the fermi level of the two sides,expressed in volts.(ii) increased with increase in doping levels of the two sides.
(iii) increase with the increase in temp.
(iv) all the above.
ans : (iv)
4. the breakdown voltage of a transitor with its base open is BV(ceo) and that with emitter open BV(cbo) then,
ans: BV(cbo)>BV(ceo)
ans: BV(cbo)>BV(ceo)
5. The gray code equivalent of binary 1100 is
a. 1011 b. 1101 c. 1010 d. 1100
6. A Multiplexer has
a. Multiple inputs and single output
b. Single input and Multiple outputs
c. Multiple inputs and Multiple outputs
d. Multiple inputs for Storage of Data
7. A binary half adder
a. Adds two binary digits and produces their sum and carry
b. Adds half the sum to the carry
c. Adds two binary digits and carry from previous addition
d. Adds two binary digits at half the speed
11. Multiplication of two nos 10101010 & 10010011 in 2’s complement form....
12 . A ckt is given suppplied with 15v with a series of resistance of 1k and a parallel combination of 12V zener diode and 2k resistance. FInd current through 2k resistance.
Ans: 6mA
a. 1011 b. 1101 c. 1010 d. 1100
6. A Multiplexer has
a. Multiple inputs and single output
b. Single input and Multiple outputs
c. Multiple inputs and Multiple outputs
d. Multiple inputs for Storage of Data
7. A binary half adder
a. Adds two binary digits and produces their sum and carry
b. Adds half the sum to the carry
c. Adds two binary digits and carry from previous addition
d. Adds two binary digits at half the speed
8. The noise figure of a receiver is a measure of:
1. Excess noise generated
2. Bandwidth of the receiver
3. Gain of the receiver
4. Operating frequency
9. The ratio receiver is:
1. Direct detection type
2. Super regenerative type
3. Super heterodyne type
4. None of these
1. Excess noise generated
2. Bandwidth of the receiver
3. Gain of the receiver
4. Operating frequency
9. The ratio receiver is:
1. Direct detection type
2. Super regenerative type
3. Super heterodyne type
4. None of these
10. Gain of an directional antenna 6db P=1mw find transmitted power………(use Ptr= G * P.)
12 . A ckt is given suppplied with 15v with a series of resistance of 1k and a parallel combination of 12V zener diode and 2k resistance. FInd current through 2k resistance.
Ans: 6mA
13. Resistivity of silicon in ohms cm. is approx. equal to
a. 50 b. 1012 c. 230k d. 10-6 14. Rsistivity ofGermanium in ohms cm. is approx. equal to
a. 50 b. 10-12 c. 50k d. 10-6
15. The number of free electrons/cubic cm intrinsic Germanium at room temperature is approx. equal to
a. 1.5*1010 b. 2.5*1013 c. 1000 d. 5*106
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