BSNL JTO 2009 QUESTION PAPER PDF

The coupling coefficient between two air core coils depends on. Which of the following is the incorrect statement for a parallel plate capacitor which is being charged-? A Energy stored in the capacitor does not enter it through the connecting wire through the space around the wires and plates of capacitor. B Rate at which energy flows into this volume is equal to the integration of the poynting vector over the boundary of the volume between the plates. C The poynting vector points everywhere radially outward of the volume between plates.

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The coupling coefficient between two air core coils depends on. Which of the following is the incorrect statement for a parallel plate capacitor which is being charged-? A Energy stored in the capacitor does not enter it through the connecting wire through the space around the wires and plates of capacitor.

B Rate at which energy flows into this volume is equal to the integration of the poynting vector over the boundary of the volume between the plates. C The poynting vector points everywhere radially outward of the volume between plates. D The poynting vector points everywhere radially in to the volume between the plats. Ans- C 3. How many links can be formed with n nodes and b branches-? When a network has 10 nodes and 17 branches in all then the number of node pair voltages would be A 7 B 9 C 10 D Ans- B 7.

What is the potential energy of an orbiting electron in any atom-? Ans- B 8. Barrier potential in a P-N junction is caused by A thermally generated electrons and holes B diffusion of majority carriers across the junction C migration of minority carriers across the junction D flow of drift current. Ans- C 9. NPN transistor is properly biased then the electrons from the emitter A Recombine with holes in the base B Recombine in the emitter itself C Pass through the base to the collector D Are stopped by the junction barrier Ans- C A Unipolar Junction Transistor can A be triggered by any one of its three terminals B Not be triggered C Be triggered by two of its three terminals only D Be triggered by all of its terminals only.

Ans- C When the graph of a network has six branches with three tree branches then the minimum number of equations required for the solution of the network is A 2 B 3 C 4 D 5 Ans- B Which one of the following is not a transducer? Ans- D Weins Bridge is used for measurement of frequency in the applied voltage waveform is measurement of frequency in the applied voltage waveform is A Sinusoidal B square C rectangular D triangular Ans- A In the case of an instrument reading of 8.

The h parameter equivalent circuit of a junction transistor is valid for A High frequency, large signal operation B High frequency, small signal operation C Low frequency, large signal operation. A system is causal if the output of any time depends only on A Values of input in the past and in the future B Values of input at that time and in the past C Values of input at that time and in the future D None Ans- B.

The electrons escape from the hot metal surface because A Of change of state from metal to gas due to heat. Negative feedback amplifier has a signal corrupted by noise as its input. The difference between the number of atoms in a unit cell of a bcc crystal and an fcc crystal is A 1 B 2 C 4 D 6 Ans- B. Which of the following materials are piezoelectric-?

A 1ms pulse can be stretched to 1 s pulse by using A an astable multivibrator B a monostable multivibrator C a bistable multivibrator D a Schmitt trigger circuit Ans-B What is the typical value for the ratio of current in a p-n junction diode in the forward bias and that in the reverse bias?

Which one of the following is not LED material? A vertical wire of length carries a current of 1A at 10MHz. The total radiated power is nearly. The common mode error voltage in a DVM can be eliminated by using at its input A a differential amplifier B a wide band amplifier C a tuned amplifier D a low-pass filter Ans-A Ans- B Which of these is not work of kalidasa?

PART 2 Ans- A An though it mourns the death of someone, need not be sad. Kanha Part situated in which state A M. Bengal Ans- B Which day is observed as Human Rights Day?

Modern capacitors which have high capacitance in small size use a dielectric of A paper B rubber C ceramic D Mylar 2. The Maximum spectral response of the germanium and silicon is in the A infrared region B ultraviolet region C visible region D x-ray region 3. For an insulating material, dielectric strength and dielectricloss should be respectively A high and high B low and high C high and low D low and low.

In a distortion factor meter, the filter at the front. The coefficient of coupling between two air core coils depends on A mutual inductance between two coils only B self inductances of the two coils only C mutual inductance and self inductances of the two coils D none 6.

For a parallel plate capacitor which is being charged out of the following the incorrect statement is A Energy stored in the capacitor does not enter it through the connecting wire through the space around the wires and plates of capacitor. D The poynting vector points everywhere radially in to the volume between the plates. The presence of alkali oxides in alumino silicate ceramics is likely to result in dielectric breakdown due to A Polarization B Conductivity C Structural homogeneties D Ionization 8.

Electrical contact materials used in switches, brushes and relays must possess A high thermal conductivity and high melting point B Low thermal conductivity and low melting point C High thermal conductivity and low melting point D Low thermal conductivity and high melting point. In any atom the potential energy of an orbiting electron is A always positive B always negative C sometime positive, sometime negative D numerically less then its kinetic energy. The advantage of a semiconductor strain gauge cover the wire round strain guage is that A it is more sensitive B it is more linear C it is less temperature dependent D its cost is low When an NPN transistor is properly biased then most of the electrons from the emitter A recombine with holes in the base B recombine in the emitter itself C pass through the base to the collector D are stopped by the junction barrier The deplition voltage for silicon diode at m0 bias is A 0.

A UJT can A be triggered by any one of its three terminals B not be triggered C be triggered by two of its three terminal only D be triggered by all of its terminals only.

The energy of electric field due to a spherical charge distribution of radius r and inform charge density in vacuum is. When a short grounded vertical antenna has a length L which is 0. When an antenna of input resistance 73 ohm is connected to a ohm line and if the losses are ignored then its efficiency will be nearly A 0. The transformer utilization factor of full wave bridge rectifier is A 0. A two port network having a 6 dB loss will give A an output power which is one quarter of the input power B an output power which is one-half of the input power C an output voltage which is 0.

D an output power which is 0. While transporting a sensitive galvanometer A the terminals are kept shorted B critical damping resistance is connected across the terminals C the terminals are kept open circuited D it does not matter as to what is connected across the terminals. A T type attenuator is designed for an attenuation of 40 dB and terminating resistance of 75 ohms. Which of the following values represent full series arm R1 and shunt arm R2?

For a transmission line, the characteristic impedance with inductance 0. When the graph of a network has six branches with three tree branches then the minimum number of equations required for the solution of the network is A 2 B 3 C 4 D 5 Consider the following statement for a 2-port network 1. As a network contains only independent current sources and resistors then if the values of all resistors are doubled then the values of the node voltages are A will become half B will remain unchanged C will become double D cannot be determined unless the circuit configuration and the values of the resistors are known.

Poynting vector watt-meter is based on. Which one of the following is not a transducer in the true sense? The term used to denote a static device that converts ac to dc, de to ac, dc to dc or ac to ac is A Converter system B Inverter C Chopper D Thyristor Weins bridge is used for measurement of frequency in the applied voltage waveform is measurement of frequency in the applied voltage waveform is A sinusoidal B square C rectangular D triangular Strain gauge is A not a transducer B an active transducer C not an electronic instrument A system is causal if the output of any time depends only on A Values of input in the past and in the future B Values of input at that time and in the past C Values of input at that time and in the future D none Form the hot metal surface electrons escape because A of change of state from metal to gas due to heat.

B of change of state from gas to metal C the energy supplied is greater than the work function D the energy is greater than Fermi Level The most common device used for detection in radio receivers is A B triode C diode D transistor In a full wave rectifier the negative point in a circuit is.

A cathode B anode C The central tap on the high voltage secondary D plate. An ideal constant current source is connected in series with an ideal constant voltage source. Considering together the combination will be a A constant voltage source B constant current source C constant voltage and a constant current source or a constant power source. D resistance Anode current in an thyristor is made up of A electrons only B electrons or holes C electrons and holes D holes only For a pulse transformer, the material used for its core and the possible turn ration from primary to secondary are respectively A ferrite : 20 : 1 B laminated iron : 1 :1 C ferrite : 1 : 1 D powered iron : 1: 1 A converter which can operate in both 3 pulse and 6 pulse mode is a A 1 phase full converter B 3 phase half wave converter C 3 phase semi converter D 3 phase full converter.

A single phase CSI has capacitor C as the load. For a constant source current, the voltage across the capacitor is A square wave B triangular wave C step function D pulsed wave The P. V per thyristor is A V B The linearity error for a digital input is indicated by.

B gamma C? Match the given feedback circuit with its proper nomenclatures A Current series feedback B Current shunt feedback C Voltage series feedback D Voltage shunt feedback Class A amplifier is used when A No phase inversion is required B Highest voltage gain is required C dc voltages are to be amplified D Minimum distortion is desired. In case a signal band limited to fermimeter is sampled at a rate less than 2 fermimeter, the constructed signal will be A Distortion-less B Small in amplitude C Having higher frequencies suppressed D Distorted Registers in which data is entered or taken out in serial form are referred as A left shift register B right shift register C shift registers D none of the above Read the following i Routh Herwitzs criterion is in time domain ii Root locus plot is in time domain iii Bode plot is in frequency domain iv Nyquist criterion is in frequency domain.

A 2,3 and 4 are correct B 1,2 and 3 are correct C 3 and 4 are correct D all four are Correct Register and counters are similar in the sense that they both A count pulses B store binary operation C shift operation C made from an array of flip flops and gates integrated on a single chip.

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Education and Career Forum. Question papers for BSNL electronics and communication? Application forms and entrance exams details for the same? Reference Books to prepare for this Exam? Originally Posted by manjula If you are belong from those degree the you are applicable for JTO exam. Telecommunication, ii.

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BSNL JTO 2009 Question Paper With Answer

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