Bharat Sanchar Nigam Limited-BSNL
Company profile
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Bharat Sanchar Nigam Limited (known as BSNL, India Communications Corporation Limited) is a public sector communications company in India. It is the India's largest telecommunication company with 25.14% market share as on December 31, 2007. Its headquarters are at Bharat Sanchar Bhawan, Harish Chandra Mathur Lane, Janpath, New Delhi. It has the status of Mini-ratna - a status assigned to reputed Public Sector companies in India.
BSNL –JTO Recruitment Exam
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Written Test duration (3 hours)
Sectional papers will be conducted:
A. Engineering Stream Paper - I
B. Engineering Stream Paper - II
C. General Ability Test Paper - III
1. The standard of paper in Engineering subjects will be that of Engineering Degree Examination of an Indian University.
2. In the general ability test, special attention will be paid to assess the candidate’s capacity for general awareness. The standard of paper in general ability test will be such as may be expected of an Engineering Graduate.
BSNL –JTO SAMPLE PAPER-1
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1. Of the following bridges the one which can be used for the measurement of dielectric loss of a capacitor is –
a.) Schering bridge
b) Heaviside campbell equal ratio voltage
c) Owen bridge
d) Anderson bridge
2. LVDT is uses as a –
a). Displacement transducer
b) Pressure transducer
c) Temperature
d.) Any of the above
3. Polarization is a measure of -
a.) Dielectric constant per unit volume.
b.)Voltage gradient to produce electrical breakdown
c.) Product of charge and distance
d.)Excess charge density
4. Compared to the inductive type of transducer, capacitive transducer is superior for the measurement of displacement because of -
a.)Absence of non-linearity
b.) High frequency response
c.) Small size
d.) High accuracy
5. An incremental model of a solid state device is one which represents the –
a.) ac property of the device at the desired operating point
b) dc property of the device at all operating points
c) Complete ac and dc behaviour of the device at all operating points
d)ac property of the device at all operating points.
6. The ac resistance of a forward biased p-n junction diode operating at a bias voltage 'V' and carrying current ‘I’ is –
a ) Zero
b) a constant value independent of Vand I
c) very high
d.) none of the above
7. A meter is shielded with a soft iron to –
a) Prevent damage from rough use
b) Keep moisture out of movement
c) Protect meter movement from stray magnetic fields
d) Achieve all of the above
8. A capacitor that has been connected across a battery for comparatively long time becomes–
a) Charged
b) Discharged
c) Short - circuited
d) Defective
9. The charge on the plates of a capacitor is given by the expression –
a.) Q = VI
b.) Q = IR
c.) Q = CV
d.) Q = IC
10. Silicon steel used for electrical purposes has silicon percentage of –
a.) 0.5
b.) 2.5
c.) 3.4
d). None
11. The feature of VTM is its –
a.) Low input impedance
b.) Low power consumbtion
c.) The ability to measure wider ranges of voltage and resistances
d) None
12. In an N-type semiconductor, the position of the fermi level –
a.) Is lower than the centre of the energy gap
b.) Is at the centre of the energy gap
c.) Is higher than the centre of the energy gap
d.) Can be anywhere depending upon the doping concentration
13. A JFET can operate in –
a.) depletion and enhancement model
b.) depletion mode only
c.) enhancement mode only
d.) neither enhancement nor depletion mode
14. Consider the following semiconductor diodes –
a.) Germanium diode
b.) Silicon diode
c.) Tunnel diode
d.) Schottky diode
15. A diode with a PIV of 50V is likely to break down when rectifying 50v ac supply because –
a.) it is made of defective material
b.) it is incorrectly connected to the supply
c.) peak value of ac supply exceeds the PIV value
d.) ac supply is of extremely high frequency.
16. The set of transistor characteristics that enables a to be determined directly from the slope is –
a.) CE transfer characteristics
b.) CE output characteristics
c.) CB transfer characteristics
d.) CB input characteristics
17. For an N-channel JFET, the drain voltage has to be –
a.) positive with respect to the source
b.) negative with respect to the source
c.) uncharged with respect to the source
d.) none
18. The SCR is often employed as a –
a.) Source-controlled switch
b.) Drain-controlled switch
c.) Gate-controlled switch
d ) None
19. An oscilloscope has an input impedance consisting of 1MW and 20pF in parallel. A high impedance probe connected to the input of this oscilloscope has a 10MW series resistance, this 10MW resistance –
a.) Need not be shunted
b.) Should be shunted by a 2pF capacitor
c.) Should be shunted by a 20pF capacitor
d.) Should be shunted by a 200pF capacitor
20. Compared to silicon, gallium arsenide (GaAs) has –
a.) Easier to grow crystals since the vapour- pressure of arsenic is high
b.) Higher optoelectronic conversion efficiency
c.) Both a and b
d). None
21. When the network shown in the fig draw a current I and if the ends ab are shorted, the current drawn would be –
a.) I
b.) I\ 4
c.) 4 I
d.) 2 I
22. When all the resistances in the circuit are of one ohm each, then the equivalent resistance across the points A and B will be –
a.) 1W
b.) 0.5W
c.) 2W
d )1.5W
23. Of the following periodic waveforms the one having only odd harmonics of sinusoidal waveform is-
a.) 1 and 2
b.) 1 and 3
c.) 1 and 4
d.) 2 and 4
24. When in the network shown in the given fig, the switch K is dosed at t = 0 with the capacitor uncharged then the value for at t = 0+ will be –
a.) 100 amp./sec.
b.) –100 amp./sec.
c.) 1000 amp./sec.
d.) –1000 amp./sec.
25. For the circuit shown in the given figure, the voltage VAB is –
a.) 6V
b.) 10V
c.) 25V
d.) 40V
26. In the network shown in the given fig. current i = 0 when E = 4V, I = 2A and I = 1A when E = 8V, I = 2A. The Thevenin voltage and the resistance into the terminals AB are –
a.) 4V, 2W
b.) 4V, 4W
c.) 8V, 2W
d.) 8V, 4W
27. The effective resistance between the terminals A and B in the circuit shown in the fig. is –
R
a.) R
b.) R-1
c.) R/2
d.) 6/11 R
28. When in a two terminal network, the open circuit voltage measured at the given terminals by an electronic voltmeter is 100V and a short circuit current measured at the same terminals by an ammeter of negligible resistance is 5A then if a resistor of 80W is connected at the same terminal, then the current in the load resistor will be –
a. 1A
b.) 1.25A
c). 6A
d. 6.25A
29. The electric potential due to an electric dipole of length L at point distance r away from it will be doubled if the -
a.) Length L of the dipole is doubled
b ) r is doubled
c) r is halved
d ) L is halved
30. When a particular mode is excited in a waveguide there appears an extra electric component in the direction of propagation . The resulting mode is
a. ) Longitudinal electric
b. ) Transverse electromagnetic
c. ) Transverse magnetic
d ). Transverse electric
31. When for a transmission line the open circuit and short circuit impedance are 20W and 5 W respectively then the characteristic impedance of the line is -
a. ) 100 Ohms
b ). 50 Ohms
c. ) 25 Ohms
d. ) 10 Ohms
32. In an ideal transmission line with matched load, the voltage standing wave ratio and reflection coefficient are respectively -
a. ) 1 and 1
b ). infinity and 1
c ) infinity and 0
d.) 1 and 0
33. When an electric charge of 100 coulombs is enclosed in sphere of radius 100 m then the electric displacement density ( in coulomb / m2) D is –
a. ) 0.0833
b ). 0.833
c. ) 1.666
d. ) 10
34. For the dominant mode in a rectangular wavelength with breadth 10 cm, the guide wavelength for a signal of 2.5 GHz will be -
a. ) 12 cm
b. ) 15 cm
c. ) 18 cm
d. ) 20 cm
35. When the phase velocity of an electromagnetic waves depends on frequency in any medium, the phenomenon is called-
a. ) Scattering
b. ) Polarization
c. ) Absorption
d. ) Dispersion
36.Antennas commonly used for microwave links are -
a. ) Loop antenna
b. ) Log-periodic antennas
c. ) Paraboloidal dishes
d ). Rhombic antennas
37. One of the following instrument which may be used to measure the optical activity of compounds is –
a. ) Infrared spectrometer
b. ) Atomic absorption spectrometer
c. ) Polarimeter
d. ) Flouroscope
38. Schering bridge measures –
a. ) Capacitance dielectric loss
b. ) Inductance
c. ) Resistance
d. ) Mutual inductance
39. When a square wave is fed to an RC circuit, then –
a. ) voltage across R is square and across C is not square
b. ) voltage across C is not square and across R is not square
c. ) voltage across both R and C are square
d. ) voltage across both R and C are not square
40. The time constant of the RC circuit is –
a. ) less than the time period of the input square wave.
b ). much larger than the time period of the input square wave.
c.) equal to the time period of the input square wave.
d ). none
41. Harmonic distortion for each frequency can be obtained by harmonic analyser of the –
a. ) heterodyne type
b. ) tuned circuit type
c. ) fundamental suppression type`
d. ) bridge circuit type.
42. A three phase wattmeter requires –
a ). only two current coils and two pressure coils
b.) only one current coil and two pressure coil
c. ) only two current coils and one pressure coil
d. ) only current coil
43. A low pass filter circuit is basically –
a. ) a differentiating circuit with low time constant
b. ) a differentiating circuit with large time constant.
c. ) an integrating circuit with low time constant.
d. ) an integrating circuit with large time constant.
44. If the differential pressure in restriction type flow measuring devices is then the flow will be proportional to –
45. When a system is represented by the transfer function then the dc gain of this system is –
a.) 1
b.) 2
c.) 5
d.) 10
46. Silicon based semiconductor device called thyristor was first fabricated by –
a). Jell laboratories in U.S.A
b). Maxwell laboratories in U.S.A
c.) Bell laboratories in U.S.A
d). GEC laboratories in U.S.A
47. A semiconductor based temperature transducer has a temperature coefficient of –2500mV/0C. This transducer is indeed a –
a.) Thermistor
b.) Forward biased pn junction diode
c.)Reverse biased pn junction diode
d.) FET
49. Which of the followings pairs of Telemetry situations and Modulation techniques and conditions is correctly matched-
a.) Pulse amplitude modulation Low amplitude signals
b.) Pulse position modulation For short distance when power is enough
c.) Pulse width modulation Power to be spent in telemetry is required to be low
d.) Pulse code modulation, minimization of interference effects.
50. The SCR ratings di/dt in A/m sec and dv/dt in n/m sec, may vary, respectively between-
a.) 20 to 500, 10 to 100
b.) both 20 to 500
c.) both 10 to 100
d.) 50 to 300, 20 to 500
51. Match the given controlled rectifiers with 50 Hz supply
a.)1 phase full converter with source inductance
b.)3 phase full converter
c.)3 phase semiconductor
d.)3 phase halls wave converter
52. For natural or forced commutation the cyclo converters (CCs) requires as under.
a) natural commutation in both step up and step down CCs
b.) forced commutation in both step up and step down CCs
c.) forced commutation in step up CCs
d). forced commutation in step down CCs
53. The peak inverse voltage in ac to dc converter system is highest in-
a). single phase full wave mid point converter
b). single phase full converter
c) 3 phase bridge converter
d). 3 phase half wave converter.
54. A single phase full converter feeds power to RLE load with R = 6 W L = 6 MH and E = 60 V. The ac source voltage is 230 V, 50 Hz, For continuous conduction, the average value of load current for a firing angle delay of 50 is
a.) 12.181 A
b). 14.81 A
c). 16.76 A
d.) 32.40 A
55. What is 2’s complement of 00011100-
a.) 11100011
b.) 10001100
c.) 11100100
d.) 10000111
56. In C programming a expression contains relational operators, assignment operators and arithmetic operators if parentheses is absent then execution follows
a.) assignment, relational, arithmatic
b.) arithmatic, relational, assignment
c.) relational, arithmatic, assignment
d.) assignment, arithmatic, relational
57. In semiconductor memory information stored in form-
a.) binary
b.) hexadecimal
c.) octal
d.) ASCII
58. I\p to Not gate gives o/p as-
a ) inversion of some bits
b.) 2’s complement of i\p
c.) 1’s complement of i\p
d.) o/p is some as i\p
59. A negative logic means-
a ) logic 0 and 1 are represented by a +ve voltage respective
b). logic 0 and 1 are presented as –ve and +ve voltage
c.) logic 0 voltage is higher than logic 1 voltage level
d.) logic 0 voltage is lower than logic 1 voltage level
60. For designing D flip flop from SR FF a circuit is aloud at 01p of SR FF is-
a.) AND
b.) OR
c.) NOR
d.) NOT
61.A 20,000 Ohms per volt meter will deflect full-scale with a current of -
a.) 50 mA
b.) 50 mA
c.) 100 mA
d.) 1000 mA
62. A plate modulated class –CRF power amplifier produces 100 KW of radiated power at 100 % modulation. The modulating audio amplifier supplies approximately -------- kW of this power-
a.) 50
b) 33
c) 22
d) 11
63. An amplifier without feedback has a distortion of 15 % and gain of 40. When 10% negative feedback is applied the distortion will become-
a.) 50 %
b) -45 %
c) 3%
d) -5%
64. MODEM implies-
a.) Modulator at transmitting side and ditector at the receiving side
b.) Which deals with analog signals and shows digital information
c.) Analog to digital at transmitting side and digital to analog at a receiving side
d) A device which deals with digital signals only
65. Twisted ring and ring counters are examples of –
a.) Synchronous counters
b.) Asynchronous counters
c.) both a and b
d.) None of the above
66. Specify Non characteristic flip flop in the following –
a.) The outputs are complement of each other
b.) The flip flop has two input signals
c.) The flip flop has two output signals
d). The flip flop is a bistable devise with only two stable states
67. The voltage obtained when digital input is 001 is a 3 bit R-2R ladder DIA converter is-
a.) VR/22
b.) VR/21
c.) VR/23
d.) none of the above
68. Identify NOT an octal number-
a.) 19
b). 15
c.) 77
d.) 101
69. The set of binary digits 01000100 represents-
a.) number 6810 in a pure binary computer
b.) number 44 in 8421 BCD code
c) Both a and b
d.) None of the above
70. The system matrix of a continuous time system, described in the state variable form is
The system is stable for all values of x and y satisfying –
a.) x < 1/2, y < 1/2
b). x < 0, y < 2
c.) x > 1/2, y >0
d.) x < 0, y < 1/2
71. The break away and break in point in the root locus for open loop transfer function G(S) H(S) = are located respectively at –
a). –2 and -1
b). –2.47 and –3.77
c.) –4.27 and –7.73
d.) –7.73 and –4.27
72. The overall transfer function in a second order is given by-
Its resonant frequency is -
73. The detection of an AM waveform in an Envelope –
a.) One side band and full amplitude carrier are needed
b.) Both side bands and full amplitude carrier are needed
c) Only two side bands are needed
d). Upper side band and part of carriers are needed
74. Satellite used for intercontinental communication is known as –
a.) Comsat
b.) Dom sat
c.) Mari sat
d). Intelsat
75. Mark out non submarine cable –
a.) TAT – 7
b.) INTELSAT V
c.) ATLANTIS
d.) CANTAT 2
76. The capacity of an analog communication channel with 4kHz bandwidth and 15 dB SNR is approximately-
a). 20,000 bps
b). 16,000 bps
c.) 10,000 bps
d.) 8,000 bps
77. The blind speed of an MTl radar can be avoided by changing the-
a.) Carrier frequency
b.) Pulse repetition frequency
c.) Antenna rotation rate
d.) Transmitted power
78. The output voltage in a feedback series regulator circuit is regulated by controlling the-
a.) Magnitude of the input voltage
b.) Gain of the feedback transistor
c.) Reference voltage
d.) Voltage drop across the series pass transistor
79. Indicate the signal not transmitted in colour TV-
a.) Y
b.) Q
c.) R
d.) I
80. As frequency of signal increases-
a.) Directivity increases & beam width increases
b.) Directivity & beam width decreases
c.) Directivity increases & beam width decreases
d.) Directivity decreases & beam width increases
81. The number of hardware interrupts (which require an external signal to interrupt) present in on 8085 mP are
a). 1
b). 4
c.) 5
d.) 13
82. Highest priority interrupt is-
a.) INTR
b.) RST 7.5
c.) RST 6.5
d.) TRAP
83. One instruction cycle means-
a.)Time require to execute set of instructions
b.)Time require to execute one instruction
c.) Time require to complete one operation of accessing memory, or I/o
d.) None of above
84. If the clock freq. is 5 mH3 how much time is required to execute on instruction of 18 T-states-
a.)3.6 msec.
b.) 36 msec.
c.) 36 msec.
d.) 36 sec.
85. In data transfer operation which flog get affected-
a. ) zero flog
b. ) carry flog
c. ) sign flog.
d.) none
86. CMP instruction comes under group -
a.) Data transfer
b.) Brouching operations
c). Machine control operation
d.) logical operations
87. The logic operation-
a).can be performed directly with content of the register.
b.) are performed without content of a
c.)none of above.
88. What happen when PUSH instruction executed -
a.) data retrieved from stock to register
b.) data from register saved on the stock.
c.) 16 bit address of instruction saved on stock.
d.) 16 bit address from stock retrieved
89. SIM stands for-
a.) serial interface memory
b.) set interrupt mask
c.) set if minus
d.) set internal memory
90. Maximum clock frequency required to operate 8085-
a.) 2 MHz
b.) 3 MHz
c) 6 MHz
d.) 9 MHz
91. ASCII code is-
a). 7 bit
b). 8 bit
c)16 bit
d.) 32 bit.
92. In memory mapped I/O address lines are-
a.) 8
b) 16
c) 32
d) 64
93. The parity bit adding technique is used for -
a.) Indexing
b.) Coding
c.) Error detection
d.) Controlling
94. A demultiplexer-
a.) has multiple i/p and single o/p
b.) has single i/p and multiple o/p
c.) has multiple i/p and multiple o/p
d.) has single i/p and single o/p
95. Subroutines are useful-
a) to reduce storage requirements
b) to increase programming speed and reduce storage
c) most applications are same
d.) but increases expense
96. As daring goes with temerity same way clear-sighted with –
a.) Perspicacity
b.) Impulsiveness
c.) Energy
d.) Clemency
97. A man who visits his friend is a –
a.) Host
b.) Guest
c.) Master
d.) Owner
98. Zealot is –
a)beginner
b) Patron
c.) fanatic
d.) Murderer
99.ive the plural of ‘Mouse’ –
a.) Mouse’s
b). Mice
c). Mouse
d). None
100Find the part of speech of the underlined word –
Shama and Radha were playing together.
a.) reposition.
b.) Noun
c.) Conjunction.
d) Verb.
101. Which of the following is not one of the multiple names of ganesha?
a). Vinayaka
b). Lambodra
c.) Ekadanta
d.) Vighneshwara
e. ) all of the above
102. If a man weighs 60 Kilograms on earth, how much will be his weight on the moon?
a. ) 50 kg
b. ) 40 kg
c. ) 20 kg
d. ) 10 kg
103. The Indian star not selected for waxing at the famous Madame Tussaud’s wax is-
a. ) Salman Khan
b. ) Amitabh Bachan
c. ) ShahRukh Khan.
d. ) Raj Kapoor
104 Rate of growth of per capita income in India drops down to – percent in 2000-2001-.
a. )5.3 percent
b. )3.5 percent
c. )4.8 percent
d. )8.4 percent
105. Ascorbic acid is the chemical name of-
a.)Vitamin A
b.)Vitamin B
c.)Vitamin C
d.) Vitamin D
106. All India Muslim League was founded by-
a.) Nawab Slimullah Khan
b.) Sir Mohd Iqubal
c.) Sir syed Ahmed Khan
d.) Moulana Shaukat Ali
106. Red Blood corpuscles are formed in-
a.)Marrow
b) Kidney
c) Liver
d) Heart
107. The southern most tip of India is in-
a.) Lakshadweeep
b.) Kanya Kumari
c ) Andaman and Nicobar Islands
d.) Rameswaram
108 The first bowler in cricket history to take 500 test wickets is-
a.) Imran Khan
b).Courtney Walsh
c). Shane Warne
d.) Muttiah Murlidharan
109. President of the National Consumer Disputes Redressal Commission (NCDRC) is-
a.) Mr. D.C Wadhwa
b). Mr. A. P Wadhwa
c.) Mr. A. C Wadhwa
d.) Mr. D. P Wadhwa
110. C.V. Raman got Nobel Prize for-
a.) Thermodynamics
b.) Quantum theory
c.)Optics and spectroscopy
d.) Nuclear Physics
111. First governor general of Bengal-
a). Lord Clive
b.) Lord Warren Hastings
c.) Lord Lytton
d.) Lord Ripon
112. The slogan “Do or Die” is associated with-
a.) Subhash Chandra Bose
b.) Gandhiji
c.) Harijan
d.) Satyagraha
113. Champaran is in the state of-
a). Gujarat
b). Maharashtra
c.) Bihar
d). Madhya Pradesh
114. These tribes are found in central Asia-
a.) Garos
b) Kirghiz
c.) Lushai
d). Santhals
115.Join these sentences meaningfully by choosing the correct alternative from the following :
You can buy a book. You can read it.
a) and
b) nor
c) either
d) neither
116. What is the opposite of Asperity –
a) gentility
b) superiority
c) kindness
d) clarity
116. The Election Commission functions under-
a) Ministry of Home Affairs
b) Ministry of Law
c) Prime Minister's Secretariat
d) None of these
117. Article 352 of Indian Constitution needs to be revoked in case-
a) President's Rule is to be imposed
b) Emergency is declared
c) Services of a Government servant are to be terminated without any enquiry
d) A political party of national level is to be banned
118. Radio-activity was first discovered by-
a) Becquerel
b) Madam Curie
c) Rutherford
d) Jenner
119. Ninth Plan in India ranges from-
a) 1995-2000
b) 1996-2001
c) 1997-2002
d) 1998-2003
120. How much electricity does India propose to generate through nuclear power by the year 2000 AD?
a) 5,000 MW
b) 10,000 MW
c) 15,000 MW
d) 20,000 MW
121. In which year did the fall of Bastille take place?
a) 1769
b) 1789
c) 1889
d) 1869
122. How may countries are non-permanent members of the Security Council?
a) 6
b) 7
c) 9
d) 10
123. The International Date Line is represented by-
a) 1000 meridian
b) 2000 meridian
c) 1800 meridian
d) 900 meridian
124. India's first satellite was launched from-
a) Sriharikota
b) Cape Kennedy
c) Bangalore
d) A Soviet cosmodrome
125. Name the author of the famous book "Politics"-
a) Aristotle
b) Socrates
c) Plato
d) None of them
126. "Guernica" is Picasso's painting on-
a) The Spanish Civil War
b) The American Civil War
c) The French Revolution
d) The Russian Revolution
127. The object of the Supreme Court's Keshvanand Bharati ruling is -
a) To put a limit on Parliament's amendatory powers
b) To give unlimited powers to Parliament to amend the Constitution
c) To give precedence to Directive Principles over Fundamental Rights
d) None of these
128. Which country in July '99 officially announced mastering of indigenously developed neutron bomb technology?
a) N. Korea
b) France
c) India
d) China
129. Shifting cultivation is commonly used in which of the following states?
a) Tamil Nadu
b) Maharashtra
c) Jammu and Kashmir
d) Nagaland
BSNL JTO Sample Paper -2
--------------------------------------------
1.For a transmission line, the propogation constant, for a TEM wave travelling in it is given by (Where the symbols have the usual meanings ) -
a) [ (R+jwL) (G+jwc)]
b) [ R+jwL) (G+jwc)] ½
c) [ (R-jwL) (G + jwc) ] ½
d) [(R-jwL) ( G+jw2c)]1/3
2.The advantages of wave guides over co-axial lines would include which of the following features-
1. Easier to use
2. lower power losses
3. Higher operating frequencies possible
a) 1 and 2
b) 1 and 3
c) 2 and 3
d) 1, 2 and 3
3.When a 75 ohm transmission line is to be terminated in two resistive loads R1 and R2 such that the standing pattern in the two cases have the same SWR , then the values of R1 and R2 (in ohms) should be -
a) 250 and 200 respectively
b) 225 and 25 respectively
c) 100 and 150 respectively
d) 50 and 125 respectively
4.The degenerate modes in a wave guide are characterized by -
a) Same cut off frequencies but different field distribution
b) Same cut off frequencies and same field distributions
c) Different cut off frequencies but same field distributions
d) Different cut off frequencies and different field distributions
5.A TEM wave impinges obliquely on a dielectric-dielectric boundary with Er1=2 and Er2=1, the angle of incidence for total reflection is -
a) 30 0
b) 60 0
c) 45 0
d) 90 0
6.The radiation pattern of Hertzian dipole in the plane perpendicular to the dipole is a -
a) Null
b) Circle
c) Figure of eight
d) None of the above
7. Permeance is the -
a) square of reluctance
b) reluctance
c) reciprocal of the reluctance
d) cube of the reluctance.
8.One of the following which is an active transducer is -
a) Photoelectric
b) Photovoltaic
c) Photo-conductive
d) Photo emission
9.The wein bridge uses only -
a) Inductors
b) Capacitors
c) Resistors
d) Capacitors and Resistors.
10.The greater the value of Q -
a) higher will be the bandwidth of the resonant circuit.
b) smaller will be the bandwidth of the resonant circuit.
c) nothing can be said)
d) none.
11.The most serious source of error in a) c) bridge measurement is -
a) eddy currents
b) leakage currents
c) residual imperfectness
d) stray fields.
12.Moving iron instruments -
a) have a linear scale
b) do not have a linear scale
c) both a and b)
d) none.
13.If accuracy is the main consideration, which one of the following voltmeters should one select -
a) 100 v ; 2 mA
b) 100 v ; 100 ohm/volt
c) 100 v ; 1mA
d) 10,000 v ; 10 mA
14.In dc tacho generators used for measurement of speed of a shaft, frequent calibration has to be done because -
a) the contacts wear off
b) the strength of permanent magnet decreases with age
c) the armature current produces heating effect
d) there is back emf.
15.Ideal transformer cannot be described by -
a) h parameters
b) ABCD parameters
c) G parameters
d) parameters
16.Consider the following statements -
A3- phase balanced supply system is connected to a 3 phase unbalanced load) Power supplied to this load can be measured using
1. Two wattmeters
2. One wattmeter
3. Three wattmeters
Which of these statements is/are correct?
a) 1 and 2
b) 1 and 3
c) 2 and 3
d) 3 alone
17.The function of the reference electrode in a pH meter is to -
a) Produce a constant voltage
b) Provide temperature compensation
c) Provide a constant current
d) Measure average pH value
18.Match the column A (Devices) with column B (Characteristics) and select the correct answer by using the codes given below the column -
Column A Column B
A) BJT 1. Voltage controlled negative resistance
B) MOSFET 2. High current gain
C) Tunnel diode 3. Voltage regulation
D) Zener diode 4. High input impedance
Codes :
A B C D
a) 1 4 2 3
b) 2 4 1 3
c) 2 3 1 4
d) 1 3 2 4
19.A thyristor during forward blocking state is associated with.-
a) large current , low voltage.
b) low current , large voltage.
c) medium current , large voltage
d) low current, medium voltage.
20.In controlled rectifiers, the nature of load current i.e. whether load current is continuous or discontinuous -
a) does not depend on type of load and firing angle delay
b) depends both on the type of load and firing angle delay
c) depends only on the type of load)
d) depends only on the firing angle delay.
21A single phase voltage controller feeds power to a resistance of 10 W . The source voltage is 200 V rms. For a firing angle of 900 , the rms value of thyristor current in amperes is -
a) 20
b) 15
c) 10
d) 5
22.In the performance of single phase and three phase full converters the effect of source inductance is to
a) reduce the ripples in the load current -
b) make discontinuous current as continuous
c) reduce the output voltage
d) increase the load voltage.
23.The cycloconverters (CCs) require natural or forced commutation as under -
a) natural commutation in both step up and step down CCs
b) forced commutation in both step up and step down CCs
c) forced commutation in step up CCs
d) forced commutation in step down CCs
24.Power transistors are more commonly of -
a) silicon npn type.
b) silicon pnp type.
c) silicon nnp type.
d) silicon npp type.
25.C is a -
a) Middle level language
b) High level language
c) Low level language
d) None of above
26.What will be output of program
main ( )
{ int i ;
print f ("Enter value of i");
scant ("%d", & i);
if ( i = 5 )
print f ("you entered 5");
else
print f ("you entered %d", i ); }
if user entered 100 then
a) 5
b) 100
c) 1005
d) None
27.(7F)16 + (BA)16 = (?)16-
a) 481
b) 139
c) –481 d) –139
28.Two’s complement of 3 bit nonzero linory number is some or original number is all bits accepts- a) MSB are zeros
b) LSB are zeros
c) MSB are ones
d) LSB are ones.
29.Transistors with high frequency have -
a) Thick base
b) Thin base
c) Some other feature
d) None of the above
30.Telephone traffic is specified in terms of -
a) Average waiting time
b) Grade of service
c) Peak waiting time
d) Erlangs
31.In a Hartley oscillator -
a) Necessary phase relation is obtained by connecting grid and plate electrodes to the opposite ends of the tuned circuit.
b) The mutual inductance must have the appropriate polarity.
c) Both grid circuit and plate tuned circuit offer inductive reactance
d) None of the above
32.The condenser C is charged in a bootstrap sweep generator -
a) Linearly but the discharge is non linear
b) Non linearly but the discharge is linear
c) Linearly and the discharge is linear
d) Non linearly and the discharge is non linear
JTO SAMPLE PAPER 2
