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BSNL MT External Technical knowledge

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BSNL MT External 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 External 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 Technical knowledge Section.

shape Samples

Materials and Components:
1. Which capacitor-store higher amount of energy?
    A. Air capacitor B. Paper capacitor C. Mica capacitor D. Plastic film capacitor
Answer: C
2. In paramagnetic materials
    A. permanent magnetic dipoles exist but the interaction between neighbouring dipoles is negligible B. permanent magnetic dipole do not exist C. permanent magnetic dipoles exist and the interaction between neighbouring dipoles is very strong D. permanent magnetic dipole moment may or may not exist
Answer: A
3. The core of a coil has a length of 10 cm. The self-inductance is 8 mH. If the core length is doubled, all other quantities remaining the same, the self-inductance will be
    A. 32 mH B. 16 mH C. 8 mH D. 4 mH
Answer: D
4. The minority carrier life time and diffusion constant in a semiconducting material are 100 μs and 100 cm2/s respectively. The diffusion length of carriers is
    A. 0.1 cm B. 0.01 cm C. 0.0141 cm D. 1 cm
Answer: A
5. Two materials having temperature coefficients of 0.004 and 0.0004 respectively are joined in series. The overall temperature coefficient is likely to be
    A. 0.08 B. 0.04 C. 0.001 D. 0.0001
Answer: C
Physical Electronics, Electronics Devices and ICs:
1. At room temperature the current in an intrinsic semiconductor is due to
    A. holes B. electrons C. ions D. holes and electrons
Answer: D
2. The most commonly used semiconductor material is
    A. silicon B. germanium C. mixture of silicon and germanium D. none of the above
Answer: A
3. In which of these is reverse recovery time nearly zero?
    A. Zener diode B. Tunnel diode C. Schottky diode D. PIN diode
Answer: C
4. A transistor has a current gain of 0.99 in the CB mode. Its current gain in the CC mode is
    A. 100 B. 99 C. 1.01 D. 0.99
Answer: A
5. The amount of photoelectric emission current depends on
    A. frequency of incident radiation B. intensity of incident radiation C. both frequency and intensity of incident radiation D. none of the above
Answer: B
Signals and Systems:
1. Which one most appropriate dynamic system?
    A. y(n) + y(n - 1) + y(n + 1) B. y(n) + y(n - 1) C. y(n) = x(n) D. y(n) + y(n - 1) + y(n + 3) = 0
Answer: A
2. An energy signal has G(f) = 10. Its energy density spectrum is
    A. 10 B. 100 C. 50 D. 20
Answer: B
3. If transfer function of a system is H(z) = 6 + [latex]z^{-1}[/latex] + [latex]z^{-2}[/latex] then system is
    A. minimun phase B. maximum phase C. mixed phase D. none
Answer: A
4. In Laplace transform, multiplication by [latex]e^{-at}[/latex] in time domain becomes
    A. translation by a in s domain B. translation by (-a) in s domain C. multiplication by [latex]e^{-as}[/latex] in s domain D. none of the above
Answer: A
5. A voltage wave having 5% fifth harmonic content is applied to a series RC circuit. The percentage fifth harmonic content in the current wave will be
    A. 5% B. more than 5% C. less than 5% D. equal or more than 5%
Answer: B
Network theory:
1. An RLC series circuit is underdamped. To make it overdamped, the value of R
    A. has to be increased B. has to be decreased C. has to be increased to infinity D. has to be reduced to zero
Answer: A
2. In a minimum function
    A. the degree of numerator and denominator are equal B. the degree of numerator and denominator are unequal C. the degree of numerator is one more than degree of denominator D. the degree of numerator is one less than degree of denominator
Answer: A
3. The drift velocity of electrons is
    A. very small as compared to speed of light B. equal to speed of light C. almost equal to speed of light D. half the speed of light
Answer: A
4. A capacitor stores 0.15C at 5 V. Its capacitance is
    A. 0.75 F B. 0.75 μF C. 0.03 F D. 0.03 μF
Answer: C
5. A 0.5 μF capacitor is connected across a 10 V battery. After a long time, the circuit current and voltage across capacitor will be
    A. 0.5 A and 0 V B. 0 A and 10 V C. 20 A and 5 V D. 0.05 A and 5 V
Answer: B
Electromagnetic Theory:
1. A broadside array consisting of 200 cm wavelength with 10 half-wave dipole spacing 10 cm. And if each array element feeding with 1 amp. Current and operating at same frequency then find the half power beam width.
    A. 4° B. 2° C. 10° D. 15°
Answer: B
2. A broadside array operating at 100 cm wavelength consist of 4 half-wave dipoles spaced 50 cm apart. Each element carries radio frequency current in the same phase and of magnitude 0.5 A. The radiated power will be
    A. 196 W B. 73 W C. 36.5 W D. 18.25 W
Answer: A
3. A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls find cut off wavelength for dominant mode.
    A. 4 cm B. 1 cm C. 2 cm D. 8 cm
Answer: A
4. A hollow rectangular waveguide has dimensions a = 2b. Calculate the amount of attenuation, if the frequency is 3 GHz, and b = 1 cm.
    A. 49 B. 47.33 C. 50.33 D. 50
Answer: B
5. A plane electromagnetic wave travels in dielectric medium of relative permittivity 9. Relative to free space, the velocity of propagation in the dielectric is
    A. increased by a factor of 9 B. increased by a factor of 3 C. unchanged D. reduced by a factor of 1/3
Answer: D
Electronic Measurements and Instrumentation:
1. To increase Q factor of a coil, the wire should be
    A. long B. thin C. thick D. long and thin
Answer: C
2. An ammeter of 0-25 A range has a guaranteed accuracy of 1% of full scale reading. The current measured is 5 A. The limiting error is
    A. 2% B. 2.5% C. 4% D. 5%
Answer: D
3. The coil of a moving iron instrument has a resistance of 500 Ω and an inductance of 1 H. It reads 250 V when a 250 V dc is applied. If series resistance is 2000 Ω, its reading when fed by 250 V, 50 Hz ac will be
    A. 260 V B. 252 V C. 250 V D. 248 V
Answer: D
4. In 3 phase power measurement by two wattmeter method, the reading of one wattmeter is zero. The power factor of load is
    A. 1 B. 0.5 C. 0 D. 0.8
Answer: B
5. In a CRO which of the following is not a part of electron gun
    A. cathode B. grid C. accelerating anode D. X - Y plates
Answer: D
Analog Electronic Circuits:
1. To prevent a DC return between source and load, it is necessary to use
    A. resistor between source and load B. inductor between source and load C. capacitor between source and load D. either (a) or (b)
Answer: C
2. Which of the following oscillators is suitable for frequencies in the range of megahertz?
    A. RC phase shift B. Wien bridge C. Hartley D. Both (a) and (c)
Answer: C
3. To protect the diodes in a rectifier and capacitor input filter circuit it is necessary to use
    A. surge resistor B. surge inductor C. surge capacitor D. both (a) and (b)
Answer: A
4. In a CE amplifier the input impedance is equal to the ratio of
    A. ac base voltage to ac base current B. ac base voltage to ac emitter current C. ac emitter voltage to ac collector current D. ac collector voltage to ac collector current
Answer: A
5. An amplifier has a large ac input signal. The clipping occurs on both the peaks. The output voltage will be nearly a
    A. sine wave B. square wave C. triangular wave D. (a) or (c)
Answer: B
Digital Electronic Circuits:
1. The resolution of an n bit DAC with a maximum input of 5 V is 5 mV. The value of n is
    A. 8 B. 9 C. 10 D. 11
Answer: C
2. 2's complement of binary number 0101 is
    A. 1011 B. 1111 C. 1101 D. 1110
Answer: A
3. An OR gate has 4 inputs. One input is high and the other three are low. The output
    A. is low B. is high C. is alternately high and low D. may be high or low depending on relative magnitude of inputs
Answer: B
4. Decimal number 10 is equal to binary number
    A. 1110 B. 1010 C. 1001 D. 1000
Answer: B
5. A device which converts BCD to seven segment is called
    A. encoder B. decoder C. multiplexer D. none of these
Answer: B
Control Systems:
1. Which terminology deals with the excitation or stimulus applied to the system from an external source for the generation of an output?
    A. Input signal B. Output signal C. Error signal D. Feedback signal
Answer: A
2. Which among the following is not an advantage of an open loop system?
    A. Simplicity in construction & design B. Easy maintenance C. Rare problems of stability D. Requirement of system recalibration from time to time
Answer: D
3. Which notation represents the feedback path in closed loop system representation?
    A. b(t) B. c(t) C. e(t) D. r(t)
Answer: A
4. Which among the following represents an illustration of closed loop system?
    A. Automatic washing machine B. Automatic electric iron C. Bread toaster D. Electric hand drier
Answer: B
5. How is an output represented in the control systems?
    A. r(t) B. c(t) C. x(t) D. y(t)
Answer: B
Communication Systems:
1. A cordless telephone using separate frequencies for transmission in base and portable units is known as
    A. duplex arrangement B. half duplex arrangement C. either (a) or (b) D. neither (a) nor (b)
Answer: A
2. For attenuation of high frequencies we should use
    A. shunt capacitance B. series capacitance C. inductance D. resistance
Answer: A
3. A modem is classified as low speed if data rate handled is
    A. upto 100 bps B. upto 250 bps C. upto 400 bps D. upto 600 bps
Answer: D
4. VSB modulation is preferred in TV because
    A. it reduces the bandwidth requirement to half B. it avoids phase distortion at low frequencies C. it results in better reception D. none of the above
Answer: A
5. A woofer should be fed from the input through a
    A. low pass filter B. high pass filter C. band pass filter D. band stop filter
Answer: A
Microwave Engineering:
1. The velocity factor of a transmission line depends on
    A. temperature B. skin effect C. relative permittivity of dielectric D. none of the above
Answer: C
2. In a klystron amplifier the input cavity is called
    A. buncher B. catcher C. Pierce gun D. collector
Answer: A
3. Microwave resonators are used in
    A. microwave oscillators B. microwave narrow band amplifier C. microwave frequency metres D. all of the above
Answer: D
4. In a TWT the amplitude of resultant wave travelling down the helix
    A. increases exponentially B. increases linearly C. decreases exponentially D. is almost constant
Answer: A
5. In a directional coupler
    A. isolation (dB) equals coupling plus directivity B. coupling (dB) equals isolation plus directivity C. directivity (dB) equals isolation plus coupling D. isolation (dB) equals (coupling) (directivity)
Answer: A
Computer Engineering:
1. Which of the following languages is more suited to a structured program?
    A. PL/1 B. FORTRAN C. BASIC D. PASCAL E. None of the above
Answer: D
2. From what location are the 1st computer instructions available on boot up?
    A. ROM BIOS B. CPU C. boot.ini D. CONFIG.SYS E. None of the above
Answer: A
3. The part of machine level instruction, which tells the central processor what has to be done, is
    A. Operation code B. Address C. Locator D. Flip-Flop E. None of the above
Answer: A
4. How many digits of the DNIC (Data Network Identification Code) identify the country?
    A. first three B. first four C. first five D. first six E. None of the above
Answer: A
5. What is the term used for describing the judgmental or commonsense part of problem solving?
    A. Heuristic B. Critical C. Value based D. Analytical E. None of the above
Answer: A
Power Electronics:
1. A cycloconverter can be
    A. step down B. step up C. step down or step up D. none of the above
Answer: C
2. Two thyristor of same rating and same specifications
    A. will have equal turn on and turn off periods B. will have equal turn on but unequal turn off periods C. may have equal or unequal turn on and turn off periods D. will have unequal turn on and turn off periods
Answer: C
3. The phenomenon of overlap in converter operation due to
    A. source resistance B. source inductance C. both source resistance and source inductance D. high value of firing angle
Answer: B
4. An SCR is triggered at 40° in the positive half cycle only. The average anode current is 50 A. If the firing angle is changed to 80°, the average anode current is likely to be
    A. 50 A B. 25 A C. less than 50 A but more than 25 A D. less than 25 A
Answer: C
5. A chopper
    A. converts constant voltage dc into ac and then into variable voltage dc B. converts constant voltage dc into variable voltage dc directly C. converts ac of one frequency into ac of another frequency D. converts ac to dc
Answer: B