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Thermistors are made of – a pure metals b pure insulators c sintered mixtures of metallic oxides d pure semiconductor Answer is: When a sample of N type semiconductor has electron density of 6. Then, the real part and wo are given by? The poles and zeros of a driving point function of a network are simple and interlace on answere negative real axis with a pole closest to the origin. The depth of penetration or skin depth for an electromagnetic field of frequency ‘f’ in a conductor of resistivity r and permeability m is- a inversely proportional to r and f and directly proportional to m b directly proportional to r and inversely proportional to f and m c directly proportional to bsml and inversely proportional to r and m d inversely proportional to r and m and directly proportional to f Answer is: 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: 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 Witj high frequency signal generator 1d An additional local oscillator will be needed Answer is: 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 Wth is: 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: 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: An air capacitor is a ” a time variant b active device c time invariant d time invariant and passive device Answer is: The resolution of a logic analyser is – a the maximum number of input channels b the minimum duration of the glitch it can capture c it’s internal clock period d the minimum amplitude of input signal it can display Answer is: High loop gain 2.

One of the following statement which is true for relative dielectric constant is – a It is dimensionless b It is not equal to unity for vacuum c It’s value for all substances is less than one d None Answer is: To form a quorum how many members of the Lok Sabha or Rajya Sabha should be present?

Learn and practice the placement papers of BSNL and find out how much you score before you appear for your next interview and written test.

For a two port reciprocal network, the output open pgevious voltage divided by the input current is equal to ” a B b Z12 c ” d h12 Answer is: The transmission does not have – a Partition noise b Flicker noise c resistance d Short noise Answer is: You can easily yfar all kind of precious test papers by practicing the exercises given below.

Essayist works with words as sculptor with- a water b stone c air d hills Answer is: The statement ‘In any network of linear impedances, the current flowing at any point is equal to papefs algebraic sum of the currents caused to flow at that point by each of the sources of emf taken separately with all other emf’s reduced to zero’ represents – a Kirchhoff’s law b Norton’s theorem c Thevenin’s theorem d Superposition theorem Answer is: Considering the conditions- 1.

An amplifier has a band width of 20 KHz and a midband gain of 50 without oapers.

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: The primary control on drain current in a JFET is exerted by – a Channel resistance b Size of depletion regions c Voltage jgo across channel d Gate reverse bias Answer is: Asnwers International Date Line is represented by- a meridian b meridian c wwith d meridian Answer is: 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: Ninth Plan in India ranges from- a b c d Answer is: The location of lightning arrestor is – a Near the transformer b Near the circuit breaker c Away from the transformer d None Answer is: The intrinsic impedance of free space- a is independent of frequency b decreases with increase of frequency c questjon with increase of frequency d varies as square questioj of frequency Answer is: 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 biased correctly, a zener diode ” a acts as a gsnl resistance b has a constant voltage across it c has a constant current passing through it d never overheats Answer is: When an ac current of 5A and dc current of 5A flow simultaneously through a circuit then which of the following statement is true?

Varoctor diode has non linearity of – a capacitance b Inductance c Resistance d Is a linear device Answer is: The 2’s complement of is ” a b c d Answer is: Microbiology Biochemistry Biotechnology Biochemical Engineering.

Poles and zeros of a driving point function of a network are simple and interlace on the jw axis.