BSNL JTO 2010 QUESTION PAPER PDF

This recruitment of Junior Telecom officer is generally done through an examination, which is usually held in the last week of June. As regards the eligibility is concerned, only Indian Nationals are eligible to apply for the post of JTO. Candidates, who are in the final year, are also eligible to submit an application provided they have the required educational qualification on or before 31st December of the examination year. As already mentioned, candidates are selected through an All-India based competitive Examination. The examination is of 3 hours and the question paper is divided into three sections, first two sections consist of 50 questions each, all from engineering stream, and the third section consists of 20 questions based on General Ability.

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Click Here. If the voltage applied across a capacitance is triangular in waveform then the waveform of the current is- a Triangular b Trapezoidal c Sinusoidal d Rectangular Answer is :- Rectangular.

Pure metals generally have- a high conductivity and low temperature coefficient b high conductivity and large temperature coefficient c low conductivity and zero temperature coefficient d low conductivity and high temperature coefficient Answer is :- high conductivity and large temperature coefficient. For small size, high frequency coils, the most common core material is a Air b Ferrite c Powdered ion d Steel Answer is :- Air.

A superconductor is a- a A material showing perfect conductivity and Meissner effect below a critical temperature b A conductor having zero resistance c A perfect conductor with highest dimagnetic susceptibility d A perfect conductor which becomes resistive when the current density through it exceeds a critical value Answer is :-A material showing perfect conductivity and Meissner effect below a critical temperature.

The location of lightning arrestor is - a Near the transformer b Near the circuit breaker c Away from the transformer d None Answer is :- Near the transformer. Time constant of an RC circuit increases if the value of the resistance is - a Increased b Decreased c Neither a nor b d Both a and b Answer is :- Increased. Intrinsic semiconductors are those which - a Are available locally b Are made of the semiconductor material in its purest from c Have more electrons than holes d Have zero energy gaps Answer is :- Are made of the semiconductor material in its purest from.

The primary control on drain current in a JFET is exerted by - a Channel resistance b Size of depletion regions c Voltage drop across channel d Gate reverse bias Answer is :- Gate reverse bias. The electrical conductivity of metals which is expressed in ohm-1 m-1 is of the order of - a b c d Answer is :- When biased correctly, a zener diode — a acts as a fixed resistance b has a constant voltage across it c has a constant current passing through it d never overheats Answer is :- has a constant voltage across it.

Compared to bipolars, FETs have- a high input impedance b low input impedance c same input impedance d none Answer is :- high input impedance. The source-drain channel of JFET is - a ohmic b bilateral c unilateral d both a and b Answer is :- both a and b.

When a sample of N type semiconductor has electron density of 6. One of the following modes which has the characteristics of attenuation becoming less as the frequency is increased and is attractive at icrowave frequencies of circular cylindrical wave guides is — a TE1 mode b TM01 mode c TE01 mode d Higher order mode Answer is :- TE01 mode.

For transmission line load matching over a range of frequencies, it is best to use a- a balun b broad band directional coupler c double stub d single stub of adjustable position Answer is :- double stub.

The poles and zeros of a driving point function of a network are simple and interlace on the negative real axis with a pole closest to the origin. Poles and zeros of a driving point function of a network are simple and interlace on the jw axis. For a two port reciprocal network, the output open circuit voltage divided by the input current is equal to — a B b Z12 c — d h12 Answer is :- Z In a short electric doublet the radiation properties are so that- a The induction field diminishes as the square root of the distance and is only appreciable in the vicinity of the conductor.

Answer is :-Mean rate of power through a unit area of spherical sphere surrounding this doublet is proportional to the square of the elemental length, other factors remaining constant. In an underground cable the distortion in the transmission of carrier frequency can be eliminated by using - a Inductive loading b Resistive loading c Capacitive loading d Shielding Answer is :- Inductive loading.

The characteristic impedance of a transmission line with inductance 0. For a quarter wavelength ideal transmission line of characteristic impedance 50 ohms and load impedance ohms, the input impedance will be — a 25W b 50Wc W d W Answer is :- 25W. When an antenna has a gain of 44dB then assuming that the main beam of the antenna is circular in cross-section the beam width will be - a 0.

Lens antennas used for microwaves are usually made of - a Polystyrene b Glass of low refractive index c Paraboloid surfaces d Dielectric media having large refractive index An,. When an ac current of 5A and dc current of 5A flow simultaneously through a circuit then which of the following statement is true?

When Q factor of a circuit is high, then - a power factor of the circuit is high b impedance of the circuit is high c bandwidth is larged none of these Answer is :- none of these. A memoryless system is — a causal b not causal c nothing can be said d none Answer is :- causal. An air capacitor is a — a time variant b active device c time invariant d time invariant and passive device Answer is :-time invariant and passive device.

Thermistors are made of - a pure metals b pure insulators c sintered mixtures of metallic oxides d pure semiconductor Answer is :- sintered mixtures of metallic oxides. Pirani gauge is used to measure — a very low pressures b high pressures c pressures in the region of 1 atm d fluid flow Answer is :- very low pressures.

These circuits converts input power at one frequency to output power at a different frequency through one stage conversion — a AC voltage controllers b Cyclo converters c Phase controlled rectifiers d Inverters Answer is :-Cyclo converters.

In a forward voltage Triggering thyristor changes from — a off state to on state b on state to off state c on state to on state d off state to off state Answer is :- off state to on state. A thyristor, when triggered, will change from forward blocking state to conduction state if its anode to cathode voltage is equal to - a peak repetitive off state forward voltage b peak working off state forward voltage c peak working off state reverse voltage d peak non-repetitive off state forward voltage Answer is :- peak working off state forward voltage.

A four quadrant operation requires- a two full converters in series b two full converters connected back to back c two full converters connected in parallel d two semi converters connected back to back Answer is :-two full converters connected back to back.

In an enhancement type MOSFET the output V-I characteristics has — a only an ohmic region b only a saturation region c only ohmic region at 10 W voltage value followed by a saturation region at higher voltages d an ohmic region at large voltage values preceded by a saturation region at lower voltages Answer is :- only ohmic region at 10 W voltage value followed by a saturation region at higher voltages.

The energy gap in a semiconductor - a increases with temperature b remains constant c slightly increase with temperature d decrease with temperature Answer is :-decrease with temperature. In an electronic circuit matching means - a connecting a high impedance directly to low impedance b selection of components which are compatible c transferring maximum amount of signal between different kinds of circuits.

P channel FETs are less superior than N channel FETs because a They have higher input impedance b They have high switching time c They consume less power d Mobility of electrons is greater than that of holes Answer is :- Mobility of electrons is greater than that of holes.

An amplifier has a band width of 20 KHz and a midband gain of 50 without feedback. The output of a class B amplifier - a is distortion free b consists of positive half cycles only c is like the output of a full wave rectifier d comprises short duration current pulses Answer is :- consists of positive half cycles only.

An amplifier with negative feedback - a lowers its lower 3 dB frequency b raises its upper 3 dB frequency c increases its bandwidth d all of the above Answer is :- all of the above.

What changes would be necessary in block C if FM signals are to be received - a Block becomes redundant b A FM detector would be required c A high frequency signal generator 1d An additional local oscillator will be needed Answer is :- A FM detector would be required. The main disadvantage of Diode-Transistor logic DTL is its- a greater speed b slower speed c average speed d none of the above Answer is :- slower speed. Basic memory cell of dynamic RAM consists of — a a flip flop b a transistor acting as a capacitor c a transistor d a capacitance Answer is :- a transistor acting as a capacitor.

Master slave flip-flop is made up of — a two flip flops connected in series b two flip flops connected in parallel c a debouncer circuit d a-D- latch Answer is :-two flip flops connected in series. Number of nybbles making one byte is — a 2 b 4 c 8 d 16 Answer is :- 2. The intrinsic impedance of free space- a is independent of frequency b decreases with increase of frequency c increases with increase of frequency d varies as square root of frequency Answer is :-is independent of frequency.

A system consists of 12 poles and 2 zeroes. Considering the conditions- 1. High loop gain 2. Less ringing 3. Greater damping 4 Negative dB gain margin System stability requirements would include? In the equatorial plane only Geosynchronous satellite are launched because it is the only plane which provides — a 24 hour orbit b stationary satellite c global communication d zero-gravity environs Answer is :- stationary satellite.

Radio Broadcasting is an example of — a space multiplexing b time multiplexing c frequency multiplexing d none of the above Answer is :- frequency multiplexing. The most common modulation system used for telegraphy is- a frequency shift keying b two — tone modulation c pulse code modulation d single tone modulation Answer is :- frequency shift keying. In colour picture tube shadow mask is used to- a reduce x-ray emission b ensure that each beam strikes only its own dotsc increase screen brightness d provide degaussing for the screen Answer is :- increase screen brightness.

The circuit that separates composite video warefore from the sync pulses is- a the keyed AGC amplifar b a clipper c an integrator d a sawtooth current Answer is :- a sawtooth current.

Signal transmission in sky wave propagation is due to — a Reforction of wave b Reflection of wave c Pierus through Inosphere d None Answer is :- Reforction of wave. According to Barkhausen Criterion Phase shift of signal should be — a b c d Answer is :- The transmission does not have - a Partition noise b Flicker noise c resistance d Short noise Answer is :- Partition noise.

Varoctor diode has non linearity of - a capacitance b Inductance c Resistance d Is a linear device Answer is :- capacitance. You can determine quickly the effect of adding poles and zeros by — a Nicholas chart b Nyquist plot c Bode plot d Root locus. Answer is :- Bode plot. Then, the real part and wo are given by- a —5, 1 b —2. A satellite link uses different frequencies for receiving and transmitting in order to — a avoid interference from terrestrial microwave links b avoid interference between its powerful transmitted signals and weak in coming signal c minimize free-space losses d maximize antenna gain Answer is :- avoid interference between its powerful transmitted signals and weak in coming signal.

Equalizing pulses in TV are sent during- a horizontal blanking b vertical blanking c the serrations d the horizontal retrace Answer is :-vertical blanking. The son seems to have ——— from his father a somewhat gloomy and moody manner- a washed b inherited c admired d attempt Answer is :-inherited. Essayist works with words as sculptor with- a water b stone c air d hills Answer is :- stone. What is a collection of sheep called?

Join these sentences meaningfully by choosing the correct alternative from the following : You can buy a book. You can read it. What is the opposite of Asperity — a gentility b superiority c kindness d clarity Answer is :- superiority.

Ninth Plan in India ranges from- a b c d Answer is :- How much electricity does India propose to generate through nuclear power by the year AD? In which year did the fall of Bastille take place?

To form a quorum how many members of the Lok Sabha or Rajya Sabha should be present? How may countries are non-permanent members of the Security Council? The International Date Line is represented by- a meridian b meridian c meridian d meridian Answer is :- meridian. Shifting cultivation is commonly used in which of the following states? Then, the real part and wo are given by?

Answer is :- —5, 1. Skip to main content. Weekly Current Affairs. Pure metals generally have- a high conductivity and low temperature coefficient b high conductivity and large temperature coefficient c low conductivity and zero temperature coefficient d low conductivity and high temperature coefficient Answer is :- high conductivity and large temperature coefficient 3. For small size, high frequency coils, the most common core material is a Air b Ferrite c Powdered ion d Steel Answer is :- Air 4.

A superconductor is a- a A material showing perfect conductivity and Meissner effect below a critical temperature b A conductor having zero resistance c A perfect conductor with highest dimagnetic susceptibility d A perfect conductor which becomes resistive when the current density through it exceeds a critical value Answer is :-A material showing perfect conductivity and Meissner effect below a critical temperature 6.

The location of lightning arrestor is - a Near the transformer b Near the circuit breaker c Away from the transformer d None Answer is :- Near the transformer 8. Time constant of an RC circuit increases if the value of the resistance is - a Increased b Decreased c Neither a nor b d Both a and b Answer is :- Increased 9.

Intrinsic semiconductors are those which - a Are available locally b Are made of the semiconductor material in its purest from c Have more electrons than holes d Have zero energy gaps Answer is :- Are made of the semiconductor material in its purest from The primary control on drain current in a JFET is exerted by - a Channel resistance b Size of depletion regions c Voltage drop across channel d Gate reverse bias Answer is :- Gate reverse bias When biased correctly, a zener diode — a acts as a fixed resistance b has a constant voltage across it c has a constant current passing through it d never overheats Answer is :- has a constant voltage across it Compared to bipolars, FETs have- a high input impedance b low input impedance c same input impedance d none Answer is :- high input impedance The source-drain channel of JFET is - a ohmic b bilateral c unilateral d both a and b Answer is :- both a and b One of the following modes which has the characteristics of attenuation becoming less as the frequency is increased and is attractive at icrowave frequencies of circular cylindrical wave guides is — a TE1 mode b TM01 mode c TE01 mode d Higher order mode Answer is :- TE01 mode For transmission line load matching over a range of frequencies, it is best to use a- a balun b broad band directional coupler c double stub d single stub of adjustable position Answer is :- double stub For a two port reciprocal network, the output open circuit voltage divided by the input current is equal to — a B b Z12 c — d h12 Answer is :- Z12 In an underground cable the distortion in the transmission of carrier frequency can be eliminated by using - a Inductive loading b Resistive loading c Capacitive loading d Shielding Answer is :- Inductive loading

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