SAIL MT Electronics & Communication Model Paper-10
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SAIL MT Electronics & Communication Model Paper-12
SAIL MT Electronics & Communication Model Paper-13
SAIL MT Electronics & Communication Model Paper-14
SAIL MT Electronics & Communication Model Paper-15
SAIL MT Electronics & Communication Model Paper-16
SAIL MT Electronics & Communication Model Paper-17
SAIL MT Electronics & Communication Model Paper-18
SAIL MT Electronics & Communication Model Paper-19
SAIL MT Electronics & Communication Model Paper-20
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Q.1.If the voltage applied across a capacitance is triangular in waveform then the waveform of the current is
Triangular
Trapezoidal
Sinusoidal
Rectangular
Q.2.One of the following statement which is true for relative dielectric constant is -
It is dimensionless
It is not equal to unity for vacuum
It’s value for all substances is less than one
None
Q.3.Pure metals generally have
high conductivity and low temperature coefficient
high conductivity and large temperature coefficient
low conductivity and zero temperature coefficient
low conductivity and high temperature coefficient
Q.4.For small size, high frequency coils, the most common core material is
Air
Ferrite
Powdered ion
Steel
Q.5.For an abrupt junction Varactor diode,the dependence of device capacitance (C) on applied reverse bias (V) is given by
C a V1/3
C a V-1/3
C a V1/2
C a V-1/2
Q.6.A superconductor is a
A material showing perfect conductivity and Meissner effect below a critical temperature
A conductor having zero resistance
A perfect conductor with highest dimagnetic susceptibility
A perfect conductor which becomes resistive when the current density through it exceeds a critical value
Q.7.When a semiconductor based temperature transducer has a temperature coefficient of –2500 mV/0C then this transducer is indeed a
Thermistor
Forward biased pn junction diode
Reverse biased pn junction diode
FET
Q.8.The location of lightning arrestor is -
Near the transformer
Near the circuit breaker
Away from the transformer
None
Q.9.Time constant of an RC circuit increases if the value of the resistance is -
Increased
Decreased
Neither a nor b
Both a and b
Q.10.Intrinsic semiconductors are those which -
Are available locally
Are made of the semiconductor material in its purest from
Have more electrons than holes
Have zero energy gaps
Q.11.The primary control on drain current in a JFET is exerted by -
Channel resistance
Size of depletion regions
Voltage drop across channel
Gate reverse bias
Q.12.The electrical conductivity of metals which is expressed in ohm-1 m-1 is of the order of -
1010
105
10-4
10-6
Q.13.When biased correctly, a zener diode –
acts as a fixed resistance
has a constant voltage across it
has a constant current passing through it
never overheats
Q.14.The current amplification factor adc is given by –
IC/IE
IC/IB
IB/IC
IB/IC
Q.15.Compared to bipolars, FETs have
high input impedance
low input impedance
same input impedance
none
Q.16.The source-drain channel of JFET is -
ohmic
bilateral
unilateral
both a and b
Q.17.A diac is equivalent to a -
Pair of SCRs
Pair of four layer SCRs
Diode and two resistors
Triac width
Q.18.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 –
106/cm3
103/ cm3
1010/ cm3
1012/ cm3
Q.19.When the two networks shown in fig. are equivalent with respect to the terminals 1 and 2 at all frequencies then the values of CA, LB, LC and CC will be –
0.5, 0.33, 6, 0.166
0.5, 3, 6, 0.66
0.5, 3, 3, 2
0.5, 3, 6, 0.166
Q.20.Poles and zeros of a driving point function of a network are simple and interlace on the jw axis.The network consists of elements –
R and C
L and C
R and L
R, L and C
Q.21.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 -
Kirchhoff's law
Norton's theorem
Thevenin's theorem
Superposition theorem
Q.22.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 –
TE1 mode
TM01 mode
TE01 mode
Higher order mode
Q.23.A two-port network is symmetrical if –
z11z22 – z12z21 = 1
h11h22 – h12h21 = 1
AD – BC = 1
y11y22 – y12y21 = 1
Q.24.For transmission line load matching over a range of frequencies,it is best to use
a balun
a broad band directional coupler
a double stub
a single stub of adjustable position
Q.25.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 -
by an LC network
as an RC driving point impedance
as an RC driving point admittance
only by an RLC network
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