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Consider the following statements Timer 555 can be used as
| |
A. | 1 and 2 [Wrong Answer] |
B. | 1 and 3 [Correct Answer] |
C. | 2 and 3 [Wrong Answer] |
D. | 1, 2, 3 [Wrong Answer] |
View Answer
Explanation:-
Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
Also Read Similar Questions Below :
⇒ A signal x(n) = sin(ω_{0}n + φ) is the input to a linear time invariant system having a frequency response H(e^{jω}) If the O/P of the system is Ax(n -n_{0}), then the general form of H(e^{jω}) will be
- n_{0}ω_{0} + β for any arbitrary real β
- n_{0}ω_{0} + 2pk for any arbitrary integer k
n_{0}ω_{0} + 2pk for any arbitrary integer k
- n_{0}ω_{0} + φ
⇒ In the following astable multivibrator circuit, which properties of v_{0}(t) depends on R_{2Only the frequencyOnly the amplitudeBoth the amplitudeNeither the amplitude nor the frequency}
⇒ In electronic voltmeters the measuring device is a
moving coil instrument
moving iron instrument
dynamometer instrument
none of the above
⇒ If X(z) = (1 - az^{-1}), and |a| < |z|, the initial value x_{0} is
1
0
2
∞
⇒ Which of the following transformers has low primary current?
Current transformer
Potential transformer
Distribution transformer
Both (a) and (b)
⇒ In CE amplifier
input and output are in phase
phase difference between input and output is 30° to 90°
phase difference between input and output is 60° to 120°
output is inverted with respect to its input voltage
⇒ In a thyristor the gate current is increased, then
anode current will increase
anode current will decrease
anode current will remain constant
anode current may increase or decrease
⇒ Turn off time of a transistor switch is equal to (where t_{s} is storage time and t_{f} is fall time.)
t_{s} + t_{f}
t_{s} - t_{f}
2t_{s}
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⇒ In CCD
a small charge is deposited for logical 1
a small charge is deposited for both logical 1 and 0
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none of the above
⇒ Which of the following codes provides parity checks?
CCITT-2
EBCDIC
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⇒ A binary with a digits, all of which are unity has the value
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2^{n} - 1
⇒ In the given figure the input frequency is such that R << X_{c},
v_{0} lags v_{i} by 90°
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⇒ The gain of an half wavelength antenna is
2.15 dB
10 dB
1.78 dB
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⇒ Which of the following, is not a piezoelectric material?
Rochelle salt
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Lithium sulphate
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⇒ The first critical frequency nearest the origin of the complex frequency plane for an RL driving point impedance will be
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a pole in left half plane
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⇒ A series R, L, C circuit has R = 2Ω, L = 1H, C = 1 μF. It is connected to an ac variable frequency source of peak voltage 10 V. At resonance the power supplied by the source will be
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⇒ Which of the following is used in the sterilization of water?
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⇒ The system in the given figure,
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⇒ The main advantage of CMOS circuit is
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low power consumption
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output signal is desired in phase with input signal
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⇒ Photo electric emission can occur only if the frequency of light is more than threshold frequency.
TRUE
FALSE
⇒
A-3, B-2, C-4, D-1
A-2, B-3, C-1, D-4
A-3, B-2, C-1, D-4
A-2, B-3, C-4, D-1
⇒ A shadow zone does not receive any space wave
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⇒ The characteristic equation of a control system is given as s^{4} + 8s^{3} + 24s^{2} + 32s + K = 0. What is the range of values of K for this system to be stable?
0 ≤ K < 80
0 ≤ K < 100
0 ≤ K < 2300
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⇒ Which of the following is not a travelling wave?
e = E_{m} sin (βx - ωt)
e = E_{m} cos (βx - ωt)
e = E_{m} sin (ωt - βx)
e = E_{m} sin (βx)
⇒ Which of the following bridges is also used in an oscillator?
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Schering
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⇒ In a zener diode
forward voltage rating is high
negative resistance characteristics exists
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none of the above
⇒ A single phase full wave regulator feeds R-L load. The best gating signal is
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long duration pulses
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either (a) or (b)
⇒ In Fermi-Dirac statistics, the probability of electron occupation of an energy level equal to Fermi level is
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0.25
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1
⇒ Consider the amplitude modulated (AM) signal A_{c} cos ω_{c}t + 2 cos ω_{m}t cos ω_{c}t For demodulating the signal using envelope detector, the minimum value of A_{c} should be
2
1
0.5
0
⇒ A signal x(n) = sin(ω_{0}n + φ) is the input to a linear time invariant system having a frequency response H(e^{jω}) If the O/P of the system is Ax(n -n_{0}), then the general form of H(e^{jω}) will be
- n_{0}ω_{0} + β for any arbitrary real β
- n_{0}ω_{0} + 2pk for any arbitrary integer k
n_{0}ω_{0} + 2pk for any arbitrary integer k
- n_{0}ω_{0} + φ
⇒ In the following astable multivibrator circuit, which properties of v_{0}(t) depends on R_{2Only the frequencyOnly the amplitudeBoth the amplitudeNeither the amplitude nor the frequency}
⇒ In electronic voltmeters the measuring device is a
moving coil instrument
moving iron instrument
dynamometer instrument
none of the above
⇒ If X(z) = (1 - az^{-1}), and |a| < |z|, the initial value x_{0} is
1
0
2
∞
⇒ Which of the following transformers has low primary current?
Current transformer
Potential transformer
Distribution transformer
Both (a) and (b)
⇒ In CE amplifier
input and output are in phase
phase difference between input and output is 30° to 90°
phase difference between input and output is 60° to 120°
output is inverted with respect to its input voltage
⇒ In a thyristor the gate current is increased, then
anode current will increase
anode current will decrease
anode current will remain constant
anode current may increase or decrease
⇒ Turn off time of a transistor switch is equal to (where t_{s} is storage time and t_{f} is fall time.)
t_{s} + t_{f}
t_{s} - t_{f}
2t_{s}
2t_{f}
⇒ In CCD
a small charge is deposited for logical 1
a small charge is deposited for both logical 1 and 0
a small charge is deposited for logical 0 and large charge for logical 1
none of the above
⇒ Which of the following codes provides parity checks?
CCITT-2
EBCDIC
ASCII
Baudot
⇒ A binary with a digits, all of which are unity has the value
n^{2} - 1
2^{n}
2(^{n - 1})
2^{n} - 1
⇒ In the given figure the input frequency is such that R << X_{c},
v_{0} lags v_{i} by 90°
v_{0} leads v_{i} by 90°
v_{0} and v_{i} are in phase
either (b) or (c)
⇒ The gain of an half wavelength antenna is
2.15 dB
10 dB
1.78 dB
100 dB
⇒ Which of the following, is not a piezoelectric material?
Rochelle salt
Quartz
Lithium sulphate
Sodium bicarbonate
⇒ The first critical frequency nearest the origin of the complex frequency plane for an RL driving point impedance will be
a zero in left half plane
a zero in right half plane
a pole in left half plane
a pole or zero in left half plane
⇒ A series R, L, C circuit has R = 2Ω, L = 1H, C = 1 μF. It is connected to an ac variable frequency source of peak voltage 10 V. At resonance the power supplied by the source will be
50 Ω
25 Ω
12.5 Ω
6.25 Ω
⇒ Which of the following is used in the sterilization of water?
Hydrogen bromide
Oxygen
Ozone
Caustic potash
⇒ The system in the given figure,
good gain and phase margin
poor gain and phase margin
good gain margin but poor phase margin
poor gain margin but good phase margin
⇒ The main advantage of CMOS circuit is
high gain
high output impedance
low power consumption
high gain and high output impedance
⇒ Class A amplifiers are preferred when
minimum distortion is required
maximum voltage gain is required
output signal is desired in phase with input signal
signal having A.C. superimposed on D.C. are to be amplified
⇒ Photo electric emission can occur only if the frequency of light is more than threshold frequency.
TRUE
FALSE
⇒
Match the following:
List I | List II | ||
---|---|---|---|
A. | Ratio of maximum energy stored to energy dissipated per cycle | 1. | Propagation constant |
B. | TEM mode is loss less medium | 2. | Cutoff frequency is zero |
C. | Ratio of frequency in radian to phase velocity of EM wave | 3. | Quality factor of cavity |
D. | TEM is the mode of lowest cutoff frequency | 4. | Cylindrical waveguide |
A-3, B-2, C-4, D-1
A-2, B-3, C-1, D-4
A-3, B-2, C-1, D-4
A-2, B-3, C-4, D-1
⇒ A shadow zone does not receive any space wave
TRUE
FALSE
⇒ The characteristic equation of a control system is given as s^{4} + 8s^{3} + 24s^{2} + 32s + K = 0. What is the range of values of K for this system to be stable?
0 ≤ K < 80
0 ≤ K < 100
0 ≤ K < 2300
0 ≤ K < 600
⇒ Which of the following is not a travelling wave?
e = E_{m} sin (βx - ωt)
e = E_{m} cos (βx - ωt)
e = E_{m} sin (ωt - βx)
e = E_{m} sin (βx)
⇒ Which of the following bridges is also used in an oscillator?
Maxwell
Schering
Hay
Wien
⇒ In a zener diode
forward voltage rating is high
negative resistance characteristics exists
sharp breakdown occurs at low reverse voltage
none of the above
⇒ A single phase full wave regulator feeds R-L load. The best gating signal is
short duration pulses
long duration pulses
pulse train
either (a) or (b)
⇒ In Fermi-Dirac statistics, the probability of electron occupation of an energy level equal to Fermi level is
0
0.25
0.5
1
⇒ Consider the amplitude modulated (AM) signal A_{c} cos ω_{c}t + 2 cos ω_{m}t cos ω_{c}t For demodulating the signal using envelope detector, the minimum value of A_{c} should be
2
1
0.5
0