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Why the cutoff frequency is taken for 3db?
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asked
Mar 10, 2018
by
anonymous
Why the cutoff frequency is taken for 3db?
cutoff
frequency
3db
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asked
Mar 10, 2018
by
anonymous
What is meant by 3db frequency?
What is meant by 3db frequency?
3db
frequency
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51
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0
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asked
Sep 10, 2017
by
anonymous
when bjt is in cutoff ?
Last answer:
When Q-point is at cut off region means it is just above the horizontal axis VCE
bjt
cutoff
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1
answer
asked
Sep 10, 2017
by
anonymous
why mosfet is used for high frequency?
Last answer:
MOSFET provides better efficiency at high frequency and its high speed switching losses are less hence MOSFET is used for high frequency.
high
frequency
mosfet
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98
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1
answer
asked
Mar 10, 2018
by
anonymous
What is the best frequency response?
What is the best frequency response?
best
frequency
response
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64
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0
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asked
Mar 10, 2018
by
anonymous
What is the frequency response of a circuit?
What is the frequency response of a circuit?
frequency
response
circuit
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91
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0
answers
asked
Mar 10, 2018
by
anonymous
What do you mean by frequency response of an amplifier?
What do you mean by frequency response of an amplifier?
frequency
response
amplifier
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asked
Apr 30, 2018
by
anonymous
For measurement of radio frequency ac signals __________ type meter is used
For measurement of radio frequency ac signals __________ type meter is used
Last answer:
For measurement of radio frequency ac signals thermo-couple type meter is used
measurement
radio
frequency
ac
signals
type
meter
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1
answer
asked
Mar 15, 2018
by
anonymous
Which capacitor is used for high frequency?
Which capacitor is used for high frequency?
capacitor
used
high
frequency
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answers
asked
May 19, 2020
by
anonymous
State the frequency and amplitude for both the voltage waveforms.
ac
phasorform
frequency
amplitude
rms
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asked
Jun 18, 2018
by
anonymous
Which of the following thyristors can be used for high frequency of operation?
Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO
Last answer:
Which of the following thyristors can be used for high frequency of operation? A) TRIAC B) DIAC C) SCR D) GTO
thyristors
used
high
frequency
operation
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1
answer
asked
Mar 24, 2018
by
anonymous
For a frequency of 200 Hz, the time period will be?
For a frequency of 200 Hz, the time period will be?
Last answer:
For a frequency of 200 Hz, the time period will be 0.005 s.
frequency
time
period
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1
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asked
Mar 19, 2018
by
anonymous
For given applied voltage, with the increase in frequency of the applied voltage?
For given applied voltage, with the increase in frequency of the applied voltage?
Last answer:
For given applied voltage, with the increase in frequency of the applied voltage eddy current loss will remain unchanged.
voltage
increase
frequency
applied
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174
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1
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asked
May 8, 2018
by
anonymous
What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to
What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage: (A) Eddy Current and Hysteresis losses will be excessive (B) Current will be too much high (C) Transformer may start to smoke and burn (D) No effect
Last answer:
What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage: (A) Eddy Current and Hysteresis losses will be ... will be too much high (C) Transformer may start to smoke and burn (D) No effect
power
transformer
designed
operation
frequency
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490
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1
answer
asked
Apr 29, 2018
by
anonymous
For a 500 Hz frequency excitation, a 50 km long power line will be modeled as
For a 500 Hz frequency excitation, a 50 km long power line will be modeled as
Last answer:
For a 500 Hz frequency excitation, a 50 km long power line will be modeled as long line
frequency
excitation
long
power
line
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1
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asked
Mar 21, 2018
by
anonymous
For measuring current at high frequency we should use?
Last answer:
For measuring current at high frequency we should use thermocouple instrument.
measuring
current
high
frequency
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1
answer
asked
Jun 18, 2018
by
anonymous
A pulse radar has a pulse repetition frequency (PRF) of 3 KHz. If the radar is emitting at 10 GHz, what is the
A pulse radar has a pulse repetition frequency (PRF) of 3 KHz. If the radar is emitting at 10 GHz, what is the maximum unambiguous range for this radar? A) 5 Km B) 5 m C) 50 Km D) 15 m
Last answer:
A pulse radar has a pulse repetition frequency (PRF) of 3 KHz. If the radar is emitting at 10 GHz, what is the maximum unambiguous range for this radar? A) 5 Km B) 5 m C) 50 Km D) 15 m
pulse
repetition
frequency
radar
emitting
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119
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asked
Jun 18, 2018
by
anonymous
The clock frequency of an 8085 microprocessor based system is 3 MHz. What should be the minimum pulse
The clock frequency of an 8085 microprocessor based system is 3 MHz. What should be the minimum pulse width of the INTR signal so that it is recognized successfully? A) 5.6 µs B) 5.7 µs C) 5.8 µs D) 5.9 µs
Last answer:
The clock frequency of an 8085 microprocessor based system is 3 MHz. What should be the minimum pulse width of the INTR signal so that it is recognized successfully? A) 5.6 µs B) 5.7 µs C) 5.8 µs D) 5.9 µs
clock
frequency
8085
microprocessor
system
minimum
pulse
width
intr
signal
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1
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asked
Jun 18, 2018
by
anonymous
What is the frequency range of VHF electromagnetic waves?
What is the frequency range of VHF electromagnetic waves? A) 30-300 kHz B) 30-3000 kHz C) 30-300 MHz D) 30-3000 MHz
Last answer:
What is the frequency range of VHF electromagnetic waves? A) 30-300 kHz B) 30-3000 kHz C) 30-300 MHz D) 30-3000 MHz
frequency
range
vhf
electromagnetic
waves
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394
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1
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asked
May 1, 2018
by
anonymous
The speed of a three-phase induction motor is controlled by variable voltage variable frequency control
The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque (1) Decreases (2) Increases (3) Remains constant (4) None of the above
Last answer:
The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque Increases
speed
three-phase
induction
motor
controlled
variable
voltage
frequency
control
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118
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1
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asked
Apr 29, 2018
by
anonymous
What is the frequency of an alternator which has 2 poles and makes 3600 revolutions per minute?
What is the frequency of an alternator which has 2 poles and makes 3600 revolutions per minute? A) 3600 HZ B) 60 Hz C) 120 Hz D) None of these
Last answer:
What is the frequency of an alternator which has 2 poles and makes 3600 revolutions per minute? A) 3600 HZ B) 60 Hz C) 120 Hz D) None of these
frequency
alternator
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1
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Apr 29, 2018
by
anonymous
What happens to the voltage in the secondary when the frequency of the supply in the primary is decreased?
What happens to the voltage in the secondary when the frequency of the supply in the primary is decreased? A) It increases B) It decreases C) It remains the same D) Cannot say unless the actual percentage increase in the frequency is known
Last answer:
What happens to the voltage in the secondary when the frequency of the supply in the primary is decreased? A) It increases B) It decreases C) It remains the same D) Cannot say unless the actual percentage increase in the frequency is known
voltage
secondary
frequency
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73
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1
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asked
Apr 28, 2018
by
anonymous
The device which allows reverse power flow and withstands highest switch frequency is
The device which allows reverse power flow and withstands highest switch frequency is (A) GTO (B) MOSFET (C) IGBT (D) Inverter grade SCR
Last answer:
The device which allows reverse power flow and withstands highest switch frequency is MOSFET
device
reverse
power
flow
highest
switch
frequency
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60
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1
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asked
Apr 28, 2018
by
anonymous
The time period of third harmonic of power supply frequency, in milliseconds, is
The time period of third harmonic of power supply frequency, in milliseconds, is (A) 20 (B) 3.33 (C) 6.66 (D) 60
Last answer:
The time period of third harmonic of power supply frequency, in milliseconds, is 6.66
time
period
third
harmonic
power
supply
frequency
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482
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1
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asked
Apr 26, 2018
by
anonymous
Two waves have frequency of 500 Hz. One is set at its maximum value whereas the other at zero. The phase
Two waves have frequency of 500 Hz. One is set at its maximum value whereas the other at zero. The phase angle between them will be
Last answer:
Two waves have frequency of 500 Hz. One is set at its maximum value whereas the other at zero. The phase angle between them will be 90o
waves
frequency
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179
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1
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asked
Apr 26, 2018
by
anonymous
In a 741 Op-Amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to the
In a 741 Op-Amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to the (A) applied load (B) internal compensation (C) impedance of the source (D) power dissipation in the chip
Last answer:
In a 741 Op-Amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to the internal compensation
741
op-amp
fall-off
starting
relatively
low
frequency
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98
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1
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asked
Mar 25, 2018
by
anonymous
The frequency of an alternating current is?
The frequency of an alternating current is?
Last answer:
The frequency of an alternating current is the number of waves passing through a point in one second.
frequency
alternating
current
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76
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1
answer
asked
Mar 24, 2018
by
anonymous
Two waves of the same frequency have opposite phase when the phase angle between them is?
Two waves of the same frequency have opposite phase when the phase angle between them is?
Last answer:
Two waves of the same frequency have opposite phase when the phase angle between them is 180°.
waves
frequency
opposite
phase
angle
between
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185
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1
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asked
Mar 19, 2018
by
anonymous
If the supply frequency to the transformer is increased, the iron loss will?
Last answer:
If the supply frequency to the transformer is increased, the iron loss will increase.
supply
frequency
transformer
increased
iron
loss
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102
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1
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asked
Mar 18, 2018
by
anonymous
Is the speed of alternator is directly proportional to frequency?
Is the speed of alternator is directly proportional to frequency?
Last answer:
Yes, speed of alternator is directly proportional to frequency.
speed
alternator
directly
proportional
frequency
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78
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1
answer
asked
Feb 3, 2018
by
anonymous
Operating frequency of power MOSFET is higher than that of power BJT. Justify the statement.
Operating frequency of power MOSFET is higher than that of power BJT. Justify the statement.
Last answer:
Power MOSFET have high turning on and turning off capability high switching speed of MOSFET is due to the high rate of change of drain voltage. The switching losses of power MOSFET ... lower frequency. Hence, operating frequency of power MOSFET is higher than that of power BJT.
mosfet
bjt
frequency
operating
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697
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1
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Sep 20, 2017
by
anonymous
What is the unit of frequency?
Last answer:
Unit of frequency is herzt
unit
frequency
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55
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2
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asked
Apr 26, 2018
by
anonymous
A 4 GHz carrier is amplitude modulated by a low-pass signal of maximum cut off frequency 1 MHz
A 4 GHz carrier is amplitude modulated by a low-pass signal of maximum cut off frequency 1 MHz. lf this signal is to be ideally sampled, the minimum sampling frequency should be nearly
Last answer:
A 4 GHz carrier is amplitude modulated by a low-pass signal of maximum cut off frequency 1 MHz. lf this signal is to be ideally sampled, the minimum sampling frequency should be nearly 4 Ghz
frequency
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102
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1
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asked
Mar 24, 2018
by
anonymous
A sine wave has a frequency of 50 Hz. Its angular frequency is _______ radian/second.
Last answer:
A sine wave has a frequency of 50 Hz. Its angular frequency is 100 n radian/second.
sine
wave
angular
frequency
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316
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1
answer
asked
Mar 21, 2018
by
anonymous
A Weston frequency meter is?
Last answer:
A Weston frequency meter is moving iron instrument.
weston
frequency
meter
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53
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1
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asked
Aug 4, 2019
by
anonymous
Define the following terms: 1) Virtual height 2) Actual height 3) Critical frequency. 4) Maximum usable frequency.
Define the following terms: 1) Virtual height 2) Actual height 3) Critical frequency. 4) Maximum usable frequency.
Last answer:
1) Virtual height:- The incident and refracted rays follow paths that are exactly the same as they have been if reflection had taken place from a surface located at a greater height, called ... angle of incidence is other than the normal is known as maximum unstable frequency. MUF= fc secθ
virtual
height
actual
critical
frequency
maximum
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56
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1
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asked
Sep 6, 2018
by
anonymous
Draw the diagram and explain the working of ferrodynamic type frequency meter.
Draw the diagram and explain the working of ferrodynamic type frequency meter.
Last answer:
Ferrodynamic type frequency meter: (Electrical resonance type frequency meter): It consists of a fixed coil. The supply whose frequency is to be measured is connected across it. This coil ... so selected that the moving coil takes up a convenient position when frequency is of normal value.
ferrodynamic
type
frequency
meter
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1
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Sep 6, 2018
by
anonymous
List the different types of frequency meters.
List the different types of frequency meters.
Last answer:
Different types of frequency meters 1. Reed type [Mechanical type] 2. Ferro-dynamic type [Resonances type] 3. Weston type 4. Ratio-meter type 5. Saturable core type 6. Digital type
different
types
frequency
meters
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47
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1
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asked
Sep 5, 2018
by
anonymous
State the application of phase sequence indicator; clip on ammeter, frequency meter & P.F. meter.
State the application of phase sequence indicator; clip on ammeter, frequency meter & P.F. meter.
Last answer:
Phase Sequence Indicator: 1. For finding correct phase sequence of supply 2. For obtaining exact instant of parallel operation of alternators. 3. For obtaining reversal of rotation ... 4. In electroplating industries 5. In various processes industries for measuring power factor
application
phase
sequence
indicator
clip
ammeter
frequency
meter
pf
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113
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1
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asked
Sep 5, 2018
by
anonymous
State the need of multistage amplifier. Draw frequency response of R-C coupled amplifier.
State the need of multistage amplifier. Draw frequency response of R-C coupled amplifier.
Last answer:
The need of multistage amplifier The voltage (or power) gain, obtained from a single stage small signal amplifier, is limited. Therefore, it is not sufficient for all practical applications. Therefore, in ... to use a MULTISTAGE AMPLIFIER . Frequency response of R-C coupled amplifier.
multistage
amplifier
frequency
response
r-c
coupled
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101
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1
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asked
Aug 30, 2018
by
anonymous
Classify the transformers based on the construction, frequency and power.
Classify the transformers based on the construction, frequency and power.
Last answer:
Classification of Transformer Based On: i) Construction: Shell type, Core type, Berry type ii) Change in voltage level: Step-Up, Step-Down, iii) Number of phases: Single phase, Three phase iv) ... Control vi) Cooling: Self-cooled, Air-cooled, Forced-air cooled, Oil-cooled, Forced-oil cooled.
classify
transformers
construction
frequency
power
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105
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1
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asked
Jun 18, 2018
by
anonymous
The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply frequency of
The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply frequency of A) 10 kHz B) 10 Hz C) 5 kHz D) 5 Hz
scr
turned
off
voltage
reversal
anode-cathode
ac
supply
frequency
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154
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0
answers
asked
May 8, 2018
by
anonymous
In a series R-C circuit, with the increase in frequency, current
In a series R-C circuit, with the increase in frequency, current (A) Reduces (B) Increases (C) Does not change (D) Becomes zero
Last answer:
In a series R-C circuit, with the increase in frequency, current Increases
series
r-c
circuit
frequency
current
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72
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1
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asked
May 8, 2018
by
anonymous
A series R-L-C Circuit has a resonant frequency of 1000 Hz. If the values of R, L and C are
A series R-L-C Circuit has a resonant frequency of 1000 Hz. If the values of R, L and C are doubled, the new resonant frequency is
Last answer:
A series R-L-C Circuit has a resonant frequency of 1000 Hz. If the values of R, L and C are doubled, the new resonant frequency is 500 Hz
series
r-l-c
circuit
resonant
frequency
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148
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1
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asked
Apr 29, 2018
by
anonymous
In a series RLC high Q circuit, the current peaks at a frequency
In a series RLC high Q circuit, the current peaks at a frequency (1) equal to the resonant frequency (2) greater than the resonant frequency (3) less than the resonant frequency (4) equal to half the resonant frequency
Last answer:
In a series RLC high Q circuit, the current peaks at a frequency equal to the resonant frequency
series
rlc
circuit
current
peaks
frequency
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228
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1
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asked
Apr 26, 2018
by
anonymous
An accelerometer has input range of 0 to 10g, natural frequency 30 Hz and mass 0.001 kg. The range of the
An accelerometer has input range of 0 to 10g, natural frequency 30 Hz and mass 0.001 kg. The range of the secondary displacement transducer in mm required to cover the input range is (A) 0 to 2.76 (B) 0 to 9.81 (C) 0 to 11.20 (D) 0 to 52.10
Last answer:
An accelerometer has input range of 0 to 10g, natural frequency 30 Hz and mass 0.001 kg. The range of the secondary displacement transducer in mm required to cover the input range is 0 to 2.76
accelerometer
natural
frequency
displacement
transducer
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57
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1
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asked
Mar 25, 2018
by
anonymous
The effective resistance of an iron-cored choke working on ordinary supply frequency...
The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of?
Last answer:
The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of iron loss in core.
effective
resistance
choke
working
ordinary
supply
frequency
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123
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1
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asked
Mar 25, 2018
by
anonymous
In a series L-C circuit at the resonant frequency the?
In a series L-C circuit at the resonant frequency the?
Last answer:
In a series L-C circuit at the resonant frequency the current is maximum.
series
lc
circuit
resonant
frequency
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69
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1
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asked
Mar 25, 2018
by
anonymous
In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of?
In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of?
Last answer:
In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of L or C.
rlc
series
resonant
circuit
magnitude
resonance
frequency
changing
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601
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1
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asked
Mar 21, 2018
by
anonymous
In a Weston frequency meter, the magnetic axes of the two fixed coils are?
Last answer:
In a Weston frequency meter, the magnetic axes of the two fixed coils are perpendicular.
weston
frequency
meter
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74
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1
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asked
Mar 21, 2018
by
anonymous
In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of?
Last answer:
In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of 0.5 Hz.
vibrating
frequency
meter
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176
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1
answer
...