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BSNL MT Internal Technical knowledge

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BSNL MT Internal Technical knowledge

shape Introduction

BSNL Management Training (MT) 2019 Examination, conducted in online Mode, has: a duration of 3 hour, a maximum score of 450 marks, and consists of 3 sections, namely – Management Aptitude, Cognitive Ability and Technical knowledge. There is a Negative marking in BSNL MT exam and 25% marks are deducted for each wrong answer. Candidates must clear the cut-off in all 3 sections to qualify for the BSNL MT exam.

shape Pattern

Components Marks Duration
Section-I - Management Aptitude 150 3 Hours (10.00 A.M. to 1.00 P.M.)
Section-II - Cognitive Ability 150
Section-III - Technical knowledge 150
Total 450

shape Syllabus

BSNL MT Internal Technical knowledge Syllabus:
The syllabus for this section is as follows:
    (1) Materials and Components
    (2) Physical Electronics, Electronics Devices and ICs
    (3) Signals and Systems
    (4) Network theory
    (5) Electromagnetic Theory
    (6) Electronic Measurements and Instrumentation
    (7) Analog Electronic Circuits
    (8) Digital Electronic Circuits
    (9) Control Systems
    (10) Communication Systems
    (11) Microwave Engineering
    (12) Computer Engineering
    (13) Power Electronics

Below mentioned are the different categories of Sample questions in the BSNL MT Internal Technical knowledge Section.

shape Samples

Materials and Components:
1. The number of valence electrons in pentavalent impurity is
    A. 5 B. 4 C. 3 D. 1
Answer: A
2. If the diameter of a wire is doubled, its current carrying capacity becomes
    A. one-fourth B. half C. twice D. four times
Answer: D
3. Material which lack permanent magnetic dipoles are known as
    A. paramagnetic B. diamagnetic C. ferromagnetic D. ferrimagnetic
Answer: B
4. For a permanent magnetic material
    A. the residual induction and coercive field should be large B. the residual induction and coercive field should be small C. area of hysteresis loop should be small D. initial relative permeability should be high
Answer: A
5. In a coaxial cable, braided copper is used for
    A. conductor B. shield C. dielectric D. jacket
Answer: B
Physical Electronics, Electronics Devices and ICs:
1. At very high temperatures the extrinsic semi-conductors become intrinsic because
    A. drive in diffusion of dopants and carriers B. band to band transition dominants over impurity ionization C. impurity ionization dominants over band to band transition D. band to band transition is balanced by impurity ionization
Answer: B
2. When a voltage is applied to a semiconductor crystal then the free electrons will flow.
    A. towards positive terminal B. towards negative terminal C. either towards positive terminal or negative terminal D. towards positive terminal for 1 μs and towards negative terminal for next 1 μs
Answer: A
3. Ferrite have
    A. low copper loss B. low eddy current loss C. low resistivity D. higher specific gravity compared to iron
Answer: C
4. The number of doped regions in PIN diode is
    A. 1 B. 2 C. 3 D. 1 or 2
Answer: B
5. As compared to an ordinary semiconductor diode, a Schottky diode
    A. has lower cut in voltage B. has higher cut in voltage C. lower reverse saturation current D. both (b) and (c)
Answer: A
Signals and Systems:
1. The signal defined by the equations f(t) = 0 for t a is
    A. a step function B. a pulse function C. a shifted step function originating at t = a D. none of the above
Answer: B
2. A signal g(t) = A then g(t) is a
    A. energy signal B. power signal C. neither energy nor power signal D. insufficient data
Answer: B
3. The Fourier series of an odd periodic function contains
    A. odd harmonics only B. even harmonics only C. cosine harmonics only D. sine harmonics only
Answer: D
4. An impulse function consist of
    A. pure dc B. pure a.c C. entire frequency range with constant phase D. infinite bandwidth with linear phase variations
Answer: C
5. Double integration of a unit step function would lead to
    A. an impulse B. a parabola C. a ramp D. a doublet
Answer: B
Network theory:
1. The synthesis of minimum function was suggested by
    A. O'Brune B. R. Richards C. Bott and Duffin D. none of the above
Answer: A
2. Which of the following is correct for a driving point functions?
    A. The real parts of all poles must be negative B. The real parts of all poles and zeros must be negative C. The real parts of all poles and zeros must be negative or zero D. The real parts of all zeros must be negative
Answer: C
3. A current is flowing through a conductor with non-uniform area of cross-section. Then
    A. current will be different at different cross-sections. B. current will be the same at all the cross-sections. C. current will be different but current density will be same at all the cross-sections D. current will be the same but current density will be different at different cross-sections.
Answer: D
4. The electrical energy required to heat a bucket of water to a certain temperature is 2 kWh. If heat losses, are 25%, the energy input is
    A. 2.67 kWh B. 3 kWh C. 2.5 kWh D. 3.5 kWh
Answer: A
5. The current rating of a cable depends on
    A. length of cable B. diameter of cable C. both length and diameter of cable D. none of the above
Answer: B
Electromagnetic Theory:
1. Consider a loss less antenna with a directive gain of + 6 dB. If 1 mW of power is fed to it the total power radiated by the antenna will be
    A. 4 mW B. 1 mW C. 7 mW D. 1/4 mW
Answer: A
2. Which of the following should dominant wave have?
    A. Lowest cut off frequency B. Highest cut off frequency C. No attenuation D. No phase shift
Answer: A
3. For a 400 kHz transmission line having L = 0.5 mH/km, C = 0.08 mF and negligible R and G, the value of propagation constant P will be
    A. 15.9 radians/km B. 31.8 radians/km C. 63.6 radians/km D. 105.4 radians/km
Answer: A
4. The Depth of penetration of EM wave in medium having conductivity σ at a frequency of 1 MHz is 25 cm. The depth of penetration at a frequency of 4 MHz will be
    A. 6.25 cm B. 12.50 cm C. 50 cm D. 100 cm
Answer: B
5. A transmission line is feeding 1 watt of power to a horn antenna having a gain of 10 dB. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free space is
    A. 10 watts B. 1 watt C. 0.1 watt D. 0.01 watt
Answer: A
Electronic Measurements and Instrumentation:
6. Which of the following voltmeters would you use for measuring voltage across 20 kΩ resistance?
    A. Voltmeter having a resistance of 5 kΩ B. Voltmeter having a sensitivity of 1 kW/V C. Voltmeter having sensitivity of 10 kW/V D. None of the above
Answer: C
7. A single phase energy meter has the rating 1200 resolutions/ kWh. If a 500 W electric gadget is used for 4 hours, the energy meter will make
    A. 1200 revolutions B. 1800 revolutions C. 2100 revolutions D. 2400 revolutions
Answer: D
8. In which of the transformer is the secondary nearly short circuited under normal operating conditions?
    A. CT B. PT C. Distribution transformer D. Power transformer
Answer: A
9. An LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5 V range through a 250 gain amplifier. For a displacement 0.5 mm the output of LVDT is 2 mV. The sensitivity of instrument is
    A. 0.1 V/mm B. 0.5 V/mm C. 1 V/mm D. 5 V/mm
Answer: C
10. In a strain measuring device using a strain gauge, the output quantity is
    A. voltage B. resistance C. impedance D. either (a) or (b)
Answer: A
Analog Electronic Circuits:
1. The self-bias provides
    A. stable Q point B. large voltage gain C. high input impedance D. high base current
Answer: A
2. Which power amplifier can deliver maximum load power?
    A. Class A B. Class AB C. Class B D. Class C
Answer: D
3. In class C operation of an amplifier circuit, the collector current exists for
    A. 360° of input wave B. 180° of input wave C. more than 180° of input wave D. less than 180° of input wave
Answer: D
4. An amplifier with loop gain Aβ will be more stable for value of Aβ as
    A. 0.95 B. 0.7 C. 1.2 D. 1.5
Answer: B
5. The quiescent collector current [latex]I_{C}[/latex], and collector to emitter voltage [latex]V_{CE}[/latex] in a CE connection are the values when
    A. ac signal is zero B. ac signal is low C. ac signal is negative D. either (a) or (b)
Answer: A
Digital Electronic Circuits:
1. In 2's complement representation the number 11100101 represents the decimal number
    A. +37 B. -31 C. +27 D. -27
Answer: D
2. A decade counter skips
    A. binary states 1000 to 1111 B. binary states 0000 to 0011 C. binary states 1010 to 1111 D. binary states 1111 to higher
Answer: C
3. BCD input 1000 is fed to a 7 segment display through a BCD to 7 segment decoder/driver. The segments which will lit up are
    A. a, b, d B. a, b, c C. all D. a, b, g, c, d
Answer: C
4. A ring counter with 5 flip flops will have
    A. 5 states B. 10 states C. 32 states D. infinite states
Answer: A
5. In the expression A + BC, the total number of minterms will be
    A. 2 B. 3 C. 4 D. 5
Answer: D
Control Systems:
1. The output is said to be zero state response because ______conditions are made equal to zero.
    A. Initial B. Final C. Steady state D. Impulse response
Answer: A
2. Basically, poles of transfer function are the laplace transform variable values which causes the transfer function to become ___________
    A. Zero B. Unity C. Infinite D. Average value
Answer: C
3. By equating the denominator of transfer function to zero, which among the following will be obtained?
    A. Poles B. Zeros C. Both a and b D. None of the above
Answer: A
4. The output signal is fed back at the input side from the _________point
    A. Summing B. Differential C. Take-off D. All of the above
Answer: C
5. In a parallel combination, the direction of flow of signals through blocks in parallel must resemble to the main _______
    A. Forward B. Feedback C. Opposite D. Diagonal
Answer: A
Communication Systems:
1. The colour subcarrier and sidebands produced by its modulation with the chrominance signals are accommodated in the standard channel width by the process of
    A. frequency adjustment B. frequency interleaving C. frequency changing D. frequency amalgamation
Answer: B
2. In colour TV receiver, varactor diode is used for
    A. detection B. rectification C. tuning D. both (a) and (b)
Answer: C
3. The number of noise sources in a BJT are
    A. 3 B. 2 C. 1 D. 4
Answer: A
4. Energy content of atmospheric noise
    A. does not depend on frequency B. decreases as frequency is increased C. increases as frequency is increased D. either (a) or (c) depending on the temperature
Answer: B
5. A 400 W carrier is amplitude modulated with m = 0.75. The total power in AM is
    A. 400 W B. 512 W C. 588 W D. 650 W
Answer: B
Microwave Engineering:
1. As the frequency is increased, the charging MVAR in a cable
    A. decreases B. increases C. remain the same D. decreases or remains the scheme
Answer: B
2. Loss angle of a good quality cable is about
    A. 1° B. 30° C. 70° D. 90°
Answer: A
3. In a three cavity klystron amplifier, the oscillations are excited in
    A. input cavity B. output cavity C. intermediate cavity D. both (a) and (b)
Answer: C
4. Which of the following lines is non-radiating?
    A. Open two wire B. Coaxial C. Both D. None of the above
Answer: Option B
5. Which of the following devices uses a helix?
    A. Klystron amplifier B. Klystron oscillator C. TWT D. Both (a) and (b)
Answer: C
Computer Engineering:
1. A computer assisted method for the recording and analyzing of existing or hypothetical systems is
    A. Data transmission B. Data flow C. Data capture D. Data processing E. None of the above
Answer: B
2. What could cause a fixed disk error.
    A. No-CD installed B. bad ram C. slow processor D. Incorrect CMOS settings E. None of the above
Answer: D
3. Which of the following refers to the associative memory?
    A. the address of the data is generated by the CPU B. the address of the data is supplied by the users C. there is no need for an address i.e. the data is used as an address D. the data are accessed sequentially E. None of the above
Answer: C
4. A station in a network forwards incoming packets by placing them on its shortest output queue. What routing algorithm is being used?
    A. hot potato routing B. flooding C. static routing D. delta routing E. None of the above
Answer: A
5. What stage of the manufacturing process has been described as "the mapping of function onto form"?
    A. Design B. Distribution C. project management D. field service E. None of the above
Answer: A
Power Electronics:
1. In a 3 phase fully controlled converter the firing frequency is
    A. 3 times the line frequency B. 6 times the line frequency C. 9 times the line frequency D. 12 times the line frequency
Answer: B
2. A semiconverter feeding an RLE load operates in
    A. first quadrant only B. first and second quadrants C. first and fourth quadrants D. first and third quadrants
Answer: A
3. A thyristor has a maximum allowable junction temperature of 120°C and the ambient temperature is 40°C. If thermal resistance is 1.6° C/W, the maximum allowable internal power dissipation is
    A. 20 W B. 50 W C. 92 W D. 128 W
Answer: B
4. The value of capacitor C for dynamic equalising circuit of series connected thyristors is determined by
    A. forward characteristics of thyristors B. reverse recovery characteristics of thyristors C. both forward and reverse recovery characteristics of thyristors D. none of the above
Answer: B
5. In a single phase full wave regulator, the firing angles in the positive and negative half cycles are generally
    A. equal B. different C. equal or different D. different but sometimes equal
Answer: A