Users Also Read
MCQ's Search Engine
Electrical Engineering
Mechanical Engineering
Civil Engineering
Automobile Engineering
Chemical Engineering
Computer Engineering
Electronics Engineering
Medical Science Engg
A transistor has
| |
A. | I only [Wrong Answer] |
B. | II only [Wrong Answer] |
C. | II and III only [Wrong Answer] |
D. | I and II only [Correct Answer] |
View Answer
Explanation:-
Answer : D Discuss it below : Ranjeet kumar Said on 2020-09-06 22:41:48 Answer B is right !! OOPS Login [Click here] is required to post your answer/result |
Also Read Similar Questions Below :
⇒ A sample of N type semiconductor has an electron density of 6.25 x 10^{18}/cm^{3} at 300 K. If intrinsic concentration of carriers in this sample is 2.5 x 10^{13}/cm^{3} at this temperature, the hole density is
10^{6} / cm^{3}
10^{8} / cm^{3}
10^{10} / cm^{3}
10^{12} / cm^{3}
⇒ The current i(t), though a 10 Ω resistor in series with an inductance, is given by i(t) = 3 + 4 sin (10t + 45°) + 4 sin (300t + 60°) Amperes. The RMS value of the current and the power dissipated in the circuit are
41 A, 410 W, respectively
35 A, 350 W, respectively
5 A, 250 W, respectively
11 A, 1210 W, respectively
⇒ The output V_{R} of the ratio detector is related with the output V_{F} of similar Foster-Seeley discriminator as follows.
V_{R} = V_{F}
V_{R} < V_{F}
V_{R} = 2V_{F}
V_{F} = 2V_{R}
⇒ A square corner reflector is used in
radio astronomy
tv broadcast
point to point communication
all of the above
⇒ An ac voltage 20 sin 1000t feeds an R-C series circuit. R = 8 Ω and active power is 4 W. The power factor is
1
0.8
0.6
0.4
⇒ Which of the following circuit has the greatest bandwidth?
f_{r} = 455 MHz; Q = 10
f_{r} = 455 MHz; Q = 100
f_{r} = 1 MHz; Q = 100
f_{r} = 1 MHz; Q = 10
⇒ In a half bridge inverter, the freewheeling diodes are needed
even when load is resistive
only when load is inductive
only when load is inductive or capacitive
for all types of loads
⇒ For an N-point FFT algorithm with N = 2^{m} which one of the following statements is TRUE?
It is not possible to construct a signal flow graph with both input and output in normal order
The number of butterflies in the m^{th} stage is N/m
In-place computation requires storage of only 2N node data
Computation of a butterfly requires only one complex multiplication
⇒ Good frequency stability can be available
crystal oscillators
Hartley oscillators
colpitts oscillators
none of the above
⇒ The average load current supplied by a thyristor depends on
firing angle
firing frequency
magnitude of gate current
all of the above
⇒ During day time ionosphere can be considered to be consisting of
D, E, F_{1} and F_{2} layers
D, E, F_{1} layers
D, E, F_{2} layers
D and E layers
⇒ ISDN stands for
Integrated Services Digital Network
Inter Services Digital Network
Inter Subscriber Digital Network
integrated Subscriber Digital Network
⇒ In a negative feedback amplifier A = 100, β = 0.04 and V_{s} = 50 mV, then feedback will be
4
8
10
2
⇒ In which of the following is the width of junction barrier very small?
Tunnel diode
Photo diode
PIN diode
Schottky diode
⇒ For a 400 kHz transmission line having L = 0.5 mH/km, C = 0.08 mF and negligible R and G, the value of propagation constant P will be
15.9 radians/km
31.8 radians/km
63.6 radians/km
105.4 radians/km
⇒ To bypass a 100 ohm emitter resistor at
10 μF
100 μF
1000 μF
1 μF
⇒ What is the address space of 8086 CPU?
One Megabyte
256 Kilobytes
1 K Megabytes
64 Kilobytes
⇒ A pre-emphasis circuit provides extra noise immunity by
converting the phase modulation of FM
preamplifying the whole audio band
amplifying the higher audio frequencies
boosting the pass frequencies
⇒ The 8086 arithmetic instruction work on
1 and 2
1 and 3
2 and 3
1, 2 and 3
⇒ Which of the following polynomials is not Hurwitz?
P_{1} = s^{8} + 2s^{6} + 4s^{4}
P_{2} = s^{6} - 3s^{4} + 2s^{2} + 1
P_{3} = s^{4} + 3s^{3} + 3s^{2} + 2s + 1
P_{4} = s^{7} + 2s^{6} 2s^{4} + 4s^{3} + 8s^{2} + 8s + 4
⇒ In an R-L-C series circuit, R = 2/L/C . If R is doubled
the response will become underdamped
the response will become overdamped
the response will be critically damped
the response may be under damped or overdamped
⇒ In a BJT CE amplifier circuit the value of coupling capacitor should be such that
its reactance is small for the lowest frequency in the input and output
its reactance is high for the lowest frequency in the input and output
its reactance is zero for the lowest frequency in the input and output
its reactance is infinite for the lowest frequency in the input and output
⇒
Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true R is false
A is false R is true
⇒ The action of backward wave oscillator is similar to that of
klystron amplifier
reflex klystron oscillator
TWT
magnetron
⇒ Floating gate is fabricated for making MOS
ROM
PROM
EPROM
EAROM
⇒ In a fully controlled bridge converter feeding a resistive load the waveshapes of output voltage and output current
are always similar
can never be similar
may be similar or dissimilar
are similar only if a = 0
⇒ In a Vidicon camera tube
grid G_{1} accelerates electrons
grid G_{2} accelerates electrons and grid G_{3}, slows down electrons
grid G_{3} accelerates electrons and grid G_{2} slows down electrons
both grids G_{2} and G_{3} accelerate electrons
⇒ In following figure, what will be R_{1} and R_{2} for maximum symmetrical swing if V_{CSat} ≈ 0. Given that R_{E} = 200 Ω, R_{C} = 400 Ω, V_{CC} = 20 V, β
6 k
3 k, 6 k
9.9 k, 2.4 k
2.4 k, 9.9 k
⇒ Find 'X' in the circuit bel
p(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15)
0
Σ(14)
1
⇒ The subtraction of a binary number Y from another binary number X, done by adding the 2's complement of Y to X results in a binary number without overflow. This implies that the result is
-ve and is in normal form
-ve and 2's complement form
+ve and is in normal form
+ve and in 2's complement
⇒ A sample of N type semiconductor has an electron density of 6.25 x 10^{18}/cm^{3} at 300 K. If intrinsic concentration of carriers in this sample is 2.5 x 10^{13}/cm^{3} at this temperature, the hole density is
10^{6} / cm^{3}
10^{8} / cm^{3}
10^{10} / cm^{3}
10^{12} / cm^{3}
⇒ The current i(t), though a 10 Ω resistor in series with an inductance, is given by i(t) = 3 + 4 sin (10t + 45°) + 4 sin (300t + 60°) Amperes. The RMS value of the current and the power dissipated in the circuit are
41 A, 410 W, respectively
35 A, 350 W, respectively
5 A, 250 W, respectively
11 A, 1210 W, respectively
⇒ The output V_{R} of the ratio detector is related with the output V_{F} of similar Foster-Seeley discriminator as follows.
V_{R} = V_{F}
V_{R} < V_{F}
V_{R} = 2V_{F}
V_{F} = 2V_{R}
⇒ A square corner reflector is used in
radio astronomy
tv broadcast
point to point communication
all of the above
⇒ An ac voltage 20 sin 1000t feeds an R-C series circuit. R = 8 Ω and active power is 4 W. The power factor is
1
0.8
0.6
0.4
⇒ Which of the following circuit has the greatest bandwidth?
f_{r} = 455 MHz; Q = 10
f_{r} = 455 MHz; Q = 100
f_{r} = 1 MHz; Q = 100
f_{r} = 1 MHz; Q = 10
⇒ In a half bridge inverter, the freewheeling diodes are needed
even when load is resistive
only when load is inductive
only when load is inductive or capacitive
for all types of loads
⇒ For an N-point FFT algorithm with N = 2^{m} which one of the following statements is TRUE?
It is not possible to construct a signal flow graph with both input and output in normal order
The number of butterflies in the m^{th} stage is N/m
In-place computation requires storage of only 2N node data
Computation of a butterfly requires only one complex multiplication
⇒ Good frequency stability can be available
crystal oscillators
Hartley oscillators
colpitts oscillators
none of the above
⇒ The average load current supplied by a thyristor depends on
firing angle
firing frequency
magnitude of gate current
all of the above
⇒ During day time ionosphere can be considered to be consisting of
D, E, F_{1} and F_{2} layers
D, E, F_{1} layers
D, E, F_{2} layers
D and E layers
⇒ ISDN stands for
Integrated Services Digital Network
Inter Services Digital Network
Inter Subscriber Digital Network
integrated Subscriber Digital Network
⇒ In a negative feedback amplifier A = 100, β = 0.04 and V_{s} = 50 mV, then feedback will be
4
8
10
2
⇒ In which of the following is the width of junction barrier very small?
Tunnel diode
Photo diode
PIN diode
Schottky diode
⇒ For a 400 kHz transmission line having L = 0.5 mH/km, C = 0.08 mF and negligible R and G, the value of propagation constant P will be
15.9 radians/km
31.8 radians/km
63.6 radians/km
105.4 radians/km
⇒ To bypass a 100 ohm emitter resistor at
10 μF
100 μF
1000 μF
1 μF
⇒ What is the address space of 8086 CPU?
One Megabyte
256 Kilobytes
1 K Megabytes
64 Kilobytes
⇒ A pre-emphasis circuit provides extra noise immunity by
converting the phase modulation of FM
preamplifying the whole audio band
amplifying the higher audio frequencies
boosting the pass frequencies
⇒ The 8086 arithmetic instruction work on
- signed and unsigned numbers
- ASCII data
- unpacked BCD data
1 and 2
1 and 3
2 and 3
1, 2 and 3
⇒ Which of the following polynomials is not Hurwitz?
P_{1} = s^{8} + 2s^{6} + 4s^{4}
P_{2} = s^{6} - 3s^{4} + 2s^{2} + 1
P_{3} = s^{4} + 3s^{3} + 3s^{2} + 2s + 1
P_{4} = s^{7} + 2s^{6} 2s^{4} + 4s^{3} + 8s^{2} + 8s + 4
⇒ In an R-L-C series circuit, R = 2/L/C . If R is doubled
the response will become underdamped
the response will become overdamped
the response will be critically damped
the response may be under damped or overdamped
⇒ In a BJT CE amplifier circuit the value of coupling capacitor should be such that
its reactance is small for the lowest frequency in the input and output
its reactance is high for the lowest frequency in the input and output
its reactance is zero for the lowest frequency in the input and output
its reactance is infinite for the lowest frequency in the input and output
⇒
Assertion (A): Absolute instruments are used in standard laboratories.
Reason (R): Absolute instruments do not require calibration.
Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true R is false
A is false R is true
⇒ The action of backward wave oscillator is similar to that of
klystron amplifier
reflex klystron oscillator
TWT
magnetron
⇒ Floating gate is fabricated for making MOS
ROM
PROM
EPROM
EAROM
⇒ In a fully controlled bridge converter feeding a resistive load the waveshapes of output voltage and output current
are always similar
can never be similar
may be similar or dissimilar
are similar only if a = 0
⇒ In a Vidicon camera tube
grid G_{1} accelerates electrons
grid G_{2} accelerates electrons and grid G_{3}, slows down electrons
grid G_{3} accelerates electrons and grid G_{2} slows down electrons
both grids G_{2} and G_{3} accelerate electrons
⇒ In following figure, what will be R_{1} and R_{2} for maximum symmetrical swing if V_{CSat} ≈ 0. Given that R_{E} = 200 Ω, R_{C} = 400 Ω, V_{CC} = 20 V, β
6 k
3 k, 6 k
9.9 k, 2.4 k
2.4 k, 9.9 k
⇒ Find 'X' in the circuit bel
p(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15)
0
Σ(14)
1
⇒ The subtraction of a binary number Y from another binary number X, done by adding the 2's complement of Y to X results in a binary number without overflow. This implies that the result is
-ve and is in normal form
-ve and 2's complement form
+ve and is in normal form
+ve and in 2's complement