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A JFET is a
tripolar device
bipolar device
None of the above
unipolar device
In figure the voltage distribution on a vertical earthed antenna is represented by
Curve B
Curve C
Curve A
Curve D
Inputs A and B of the given figure are applied to a NANDgate.
The output is LOW
from 0 to 2
from 0 to 6
from 1 to 2 and 3 to 4
from 0 to 1 and 2 to 3
To neglect a current source the terminals across the source are
replaced by capacitance
short-circuited
open-circuited
replaced by some resistance
BFO stands for
Ballistic Frequency Oscillator
Beat frequency oscillator
Broad Frequency Oscillator
Blocking Frequency Oscillator
Computer ICs work reliably because
these are made from pure silicon
they are based on two state design
None of the above
these are maintained at two temperatures
The expression A2 + B2 - 3 AB when written is Pascal should be written as
A * A + B * B - 3.0 A * B
A * A + B * B - 3 A * B
A * A + B * B - 3.0 * A * B
A * A + B * A - 3 * A * B
Which is not a software
Windows
Hard Disk
MS Word
DOS
The disadvantage of transformer coupling in amplifier is
cost of transformer at audio frequencies
cost and size of transformer at audio frequencies
size of transformer at audio frequencies
size of transformer at radio frequencies
Assertion
(A): When an electron is revolving in its orbit and magnetic field is also present, the angular frequency of electron will be affected by the magneticfield.
Reason (R): In the case of electron revolving in its orbit in the presence of magnetic field, the orbital magnetic dipole moment is not affected by the presence of magnetic field
Both A and R are true but R is not correct explanation of A
Both A and R are true and R is correct explanation of A
A is false but R is true
A is true but R is false
In a plate modulated class C amplifier, the peak supply voltage is
V. The maximum plate-cathode voltage can be
4 V
2.5 V
1.5 V
1 V
In a radio receiver, the local oscillator is always tuned to a frequency higher than the incoming frequency to
facilitate image frequency rejection
All of the above
facilitate tracking
allow permit adequate frequency coverage without switching
In a 3 phase bridge inverter with 120° mode of operationthe.
number of thyristors conducting at one time are
3
1
2
4
In the given figure power meters at A and B indicate 1 mW and 110 μWrespectively.
VSWR of line is
2
2.5
3
1.5
In pulse width modulation of chopper
Ton is kept constant T is varied
both T and Ton are varied
either T or Ton is varied
T is kept constant and Ton is varied
Assertion
(A): If , the final value of i(t) = 10Reason (R): If , the initial value i(t) = 2
Both A and R are correct but R is not correct explanation of A
A is true, R is false
Both A and R are correct and R is correct explanation of A
A is false, R is true
If , the coefficient of term e-t in f(t) will be
1
0.5
2/3
The distance of a direct broadcasting satellite from earth's surface is about
1000 km
55000 km
10000 km
36000 km
In a piezoelectric crystal, the application of mechanical force will cause
magnetic Dipoles in the crystal
electrical polarization in the crystal
plastic deformation of crystal
shift in Fermi level
Assertion
(A): Transient analysis uses Laplacetransformation.
Reason (R): Laplace transform method is suitable for solution of integro differential equations
Both A and R are correct and R is correct explanation of A
A is true, R is false
A is false, R is true
Both A and R are correct but R is not correct explanation of A
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