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A CE amplifier is the most common BJT amplifier. | |
A. | TRUE [Correct Answer] |
B. | FALSE [Wrong Answer] |
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Explanation:-
Answer : A Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
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f_{T} = 1.47 x 10^{10} Hz ; g_{m} = 38 milli mho
f_{T} = 1.64 x 10^{8} Hz ; g_{m} = 30 milli mho
f_{T} = 1.47 x 10^{9} Hz ; g_{m} = 38 mho
f_{T} = 1.33 x 10^{12} Hz; g_{m} = 0.37 m-mho
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RS FF
D FF
T FF
Clocked RS FF
⇒ A varactor diode is used for
tuning
rectification
amplification
rectification and amplification
⇒ For a npn BJT transistor f_{β} is 1.64 x 10^{8} Hz. C_{μ} = 10^{-14} F; C_{p} = 4 x 10^{-13} F and DC current gain is 90. Find f_{T} and g_{m} (f_{β} = cut off frequency, C_{μ} = capacitance, C_{p} = parasitic capacitance, g_{m} = transconductance, f_{T} = gain BW product)
f_{T} = 1.47 x 10^{10} Hz ; g_{m} = 38 milli mho
f_{T} = 1.64 x 10^{8} Hz ; g_{m} = 30 milli mho
f_{T} = 1.47 x 10^{9} Hz ; g_{m} = 38 mho
f_{T} = 1.33 x 10^{12} Hz; g_{m} = 0.37 m-mho
⇒ Nyquist plot provides information about absolute stability as well as relative stability.
TRUE
FALSE
⇒ ∇^{2} is
vector
scalar
depend on direction
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⇒ A transmission line of characteristic impedance z_{0} = 50 Ω. Phase Velocity = 2 x 10^{8} m/sec, and length l = 1 m is terminated by a load z_{1} = (30 - j 40) ohms. The input impedance of the line for a frequency of 100 MHz will be
(30 + j x 40) Ω
(30 - j 40) Ω
(50 + j x 40) Ω
(50 - j 40) Ω
⇒ At night D layer of ionosphere is absent.
TRUE
FALSE
⇒ Which of the following statement is false?
Television signals are propagated as ground waves
Surface waves can propagate on piezoelectric substrates
The skip distance is the maximum distance upto which ionospheric reflection is possible
Tropospheric scatter propagation is always subjects to fading
⇒ In what range should Re(s) remains so that Laplace transform of the function e^{(a + 2)t + 5} exists?
Re(s) > a + 2
Re(s) > a + 7
Re(s) < a
Re(s) > a + 5
⇒ Polystyrene has a relative permittivity of 2.7. If the wave is incident at an angle θ_{i} of 30° from air into polystyrene, the angle of transmission will be nearly
0.2°
2°
18°
48°
⇒ The maximum phase difference between the applied voltage and current in a RLC series current with finite values of R, L, C, and f can be
less than 90°
less than 45°
180°
30°
⇒ A broadside array consisting of 200 cm wavelength with 10 half-wave dipole spacing 10 cm. And if each array element feeding with 1 amp. current and operating at same frequency then find the half power beamwidth
4°
2°
10°
15°
⇒ A waveguide behave as
high Pass filter
low Pass filter
band Pass filter
all Pass filter
⇒ The maximum rectification efficiency in case of full wave rectifier is
1
0.812
0.666
0.406
⇒ In a half wave voltage doubler circuit the input frequency is 50 Hz. The ripple frequency is
25 Hz
50 Hz
100 Hz
150 Hz
⇒ A step voltages is applied to RLC series circuit having R = 2 Ω, L = 1 H and C = 1 F. The transient current response will be
over damped
critically damped
under damped
any of the above depending the magnitude of voltage
⇒ The use of thermocouple meters for ac measurement leads to a scale which is
linear
square law
logarithmic
exponential
⇒ For a second order system, the position of poles is shown in the given figure. This syste
undamped
overdamped
underdamped
critically damped
⇒ Number of cards read per minute by a card reader may be of the order of
20
1
10000
300
⇒ In which configuration does output ac voltage appear between emitter and ground?
CE
CB
CC
Both CE and CB
⇒ In figure, the curre
is 2 A from A to B
is 2 A from B to A
depends on the value of R
none of the above
⇒ j^{6} =
j
j^{2}
j^{3}
- j
⇒ A full bridge inverter is fed by a battery of 30 V. The rms value of output voltage is
15 V
152 V
30 V
302 V
⇒ A circular waveguide has an infinite set of TE and TM modes.
TRUE
FALSE
⇒ In Pascal an array declaration provides information to the Pascal processor to enable it to
identify the variable as an array name
reserve memory locations to store all the components of array
check the values computed for subscripts expressions during program execution with the specified lower and upper limits of subscripts
all of the above
⇒ The turn ratio of a transformer is 20:1, if a load of 10Ω is connected across the secondary, what will be the effective resistance seen looking into the Primary?
2 kΩ
4 kΩ
8 kΩ
32 kΩ
⇒ An enhancement mode MOSFET is on when the gate voltage is
zero
positive
high
more threshold value
⇒ Donor energy level is n type semiconductor is very near valence band.
TRUE
FALSE
⇒ The poles of an RC function
are simple and lie on jω axis
are simple and lie on negative real axis
may be complex conjugate
may be anywhere in s plane
⇒ In deriving ac equivalent circuit for an amplifier circuit we short circuit
all resistors
all transistors
all inductors
all capacitors