Few Questions from the BSNL JTO 2008 exam , My friend could remember only these but i think these would give you a rough idea about type of questions to be asked later , will add more questions as I get them .
Diac is equivalent to a –
a) Pair of SCRs
b) Pair of four layer SCRs
c) Diode and two resistors
d) Triac width
Answer: b
When a sample of N type semiconductor has electron density of 6.25 ´ 1011 /cm3 at 300K and if the intrinsic concentration of carriers in this sample is 2.5 ´ 1013/cm3 then the hole density will be –
a) 106/cm3
b) 103/ cm3
c) 1010/ cm3
d) 1012/ cm3
Answer: b
The statement ‘In any network of linear impedances, the current flowing at any point is equal to the 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: d
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: a
A two-port network is symmetrical if –
a) z11z22 – z12z21 = 1
b) h11h22 – h12h21 = 1
c) AD – BC = 1
d) y11y22 – y12y21 = 1
Answer: c
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: c
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. It can be realised –
a) by an LC network
b) as an RC driving point impedance
c) as an RC driving point admittance
d) only by an RLC network
Answer: d
Poles and zeros of a driving point function of a network are simple and interlace on the jw axis. The network consists of elements –
a) R and C
b) L and C
c) R and L
d) R, L and C
Answer: b
For a two port reciprocal network, the output open circuit voltage divided by the input current is equal to –
a) B
b) Z12
c) 12
d) h12
Answer: b
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.
b) In the radiation, magnetic field is minimum when the current is maximum.
c) The radiation resistance of a short doublet antenna is extremely high.
d) 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.
Answer: d
The frequency modulated (FM) radio frequency range is nearly –
a) 250 –300 MHz
b) 150 – 200 MHz
c) 90 – 105 MHz
d) 30-70 MHz
Answer: c
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: a
The characteristic impedance of a transmission line with inductance 0.294 mH /m and capacitance 60 pF/m is –
a) 49 W
b) 60 W
c) 70 W
d) 140 W
Answer: c
For a quarter wavelength ideal transmission line of characteristic impedance 50 ohms and load impedance 100 ohms, the input impedance will be –
a) 25W
b) 50W
c) 100W
d) 150W
Answer: a
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 f and inversely proportional to r and m
d) inversely proportional to r and m and directly proportional to f
Answer: b
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) 0.4456 0
b) 1.44560
c) 2.44560
d) 3.44560
Answer: b
Hope these Questions helped will post more soon .
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