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inductors have a high impedance when?
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Aug 22, 2017
by
anonymous
inductors have a high impedance when?
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Nov 28, 2017
by
James
When you increase the number of turns.
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asked
Aug 22, 2017
by
anonymous
can inductors have resistance?
can inductors have resistance?
Last answer:
Yesss every inductor has resistance ... Because it is also made up of good conductor have some value of resistance practicaly But ideal inductor has resistance is zero
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Apr 9, 2018
by
anonymous
Maximum power is transferred when load impedance is ...
Maximum power is transferred when load impedance is A) equal to source impedance B) equal to half of the source impedance C) equal to zero D) none of the above
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Apr 9, 2018
by
anonymous
An air core transformer has primary and secondary inductors of 8mH and 10 mH respectively...
An air core transformer has primary and secondary inductors of 8mH and 10 mH respectively. The mutual inductance is 5mH. The coefficient of coupling is A) 1/8 B) 1/6 C) ¼ D) ½
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Mar 29, 2018
by
anonymous
When a transistor is connected in common emitter mode, it with have
Last answer:
When a transistor is connected in common emitter mode, it with have medium input resistance and high output resistance.
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asked
May 3, 2018
by
anonymous
A transmission line has 1 P.0 impedance on a base of 11 KV, 100 MVA. On a base of 55 KV. it will have a P.0 impedance of
A transmission line has 1 P.0 impedance on a base of 11 KV, 100 MVA. On a base of 55 KV. it will have a P.0 impedance of
Last answer:
A transmission line has 1 P.0 impedance on a base of 11 KV, 100 MVA. On a base of 55 KV. it will have a P.0 impedance of 0.02 P.U
transmission
line
impedance
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May 16, 2018
by
anonymous
The driving point impedance with poles at ω = 0(zero) and ω = ∞ (infinity) must have the
The driving point impedance with poles at ω = 0(zero) and ω = ∞ (infinity) must have the (a) s term in the denominator and an excess term in the numerator (b) s term in the numerator and an excess term in the denominator (c) s term in the numerator and equal number of terms in the numerator and denominator (d) s term in the denominator and equal number of terms in the numerator and denominator
Last answer:
The driving point impedance with poles at ω = 0(zero) and ω = ∞ (infinity) must have the s term in the denominator and an excess term in the numerator
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asked
May 13, 2018
by
anonymous
An accurate voltmeter must have an internal impedance of
An accurate voltmeter must have an internal impedance of (A) very low value. (B) very high value (C) medium value. (D) zero Value
Last answer:
An accurate voltmeter must have an internal impedance of very high value
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Mar 28, 2018
by
anonymous
Two voltmeters have the same range 0-400V. The internal impedance ...
Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are
Last answer:
Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are 360V and 240V.
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asked
Mar 19, 2018
by
anonymous
Two transformers do not have equal percentage impedance. This is likely to result in?
Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in?
Last answer:
Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in loading of the transformers not in proportion to their kVA ratings.
transformers
parallel
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asked
May 17, 2018
by
anonymous
When a dominant mode wave guide not terminated in its characteristic impedance is excited with a 10 GHZ
When a dominant mode wave guide not terminated in its characteristic impedance is excited with a 10 GHZ signal then if d is the distance between two successive minima of the standing wave in the guide then (A) d = 1.5 cm (B) d is less then 1.5 cm (C) d is greater then 1.5 cm (D) d = 3 cm
Last answer:
When a dominant mode wave guide not terminated in its characteristic impedance is excited with a 10 GHZ signal then if d is the distance between two successive minima of the standing wave in the guide then d = 1.5 cm
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asked
May 13, 2018
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anonymous
When the load on a transmission line is equal to the surge impedance loading
When the load on a transmission line is equal to the surge impedance loading (a) The receiving end voltage is less than the sending end voltage (b) The sending end voltage is less than the receiving end voltage (c) The receiving end voltage is more than the sending end voltage (d) The receiving end voltage equal to the sending end voltage
Last answer:
When the load on a transmission line is equal to the surge impedance loading The receiving end voltage equal to the sending end voltage
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asked
May 16, 2018
by
anonymous
The lossless line of characteristics impedance 300 Ohm is terminated in a pure resistance of 200 Ohm.
The lossless line of characteristics impedance 300 Ohm is terminated in a pure resistance of 200 Ohm. The value of the standing wave ratio is (a) 1.5 (b) 0.67 (c) 1.0 (d) 1.25
Last answer:
The lossless line of characteristics impedance 300 Ohm is terminated in a pure resistance of 200 Ohm. The value of the standing wave ratio is 1.5
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asked
Apr 9, 2018
by
anonymous
A loss less line of characteristic impedance Z0 is terminated in pure reactance of –jZ0 value. VSWR is
A loss less line of characteristic impedance Z0 is terminated in pure reactance of –jZ0 value. VSWR is (1) 10 (2) 2 (3) 1 (4) Infinity
Last answer:
A loss less line of characteristic impedance Z0 is terminated in pure reactance of –jZ0 value. VSWR is Infinity.
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asked
Apr 9, 2018
by
anonymous
The magnitude of the open-circuit and short circuit input impedance of a transmission line are 100 ohm and...
The magnitude of the open-circuit and short circuit input impedance of a transmission line are 100 ohm and 25 ohm respectively. The characteristic impedance of line is: (1) 25 ohm (2) 50 ohm (3) 75 ohm (4) 100 ohm
Last answer:
The magnitude of the open-circuit and short circuit input impedance of a transmission line are 100 ohm and 25 ohm respectively. The characteristic impedance of line is 25 ohm.
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asked
May 25, 2018
by
anonymous
A high-Q tuned circuit in an amplifier permits to have high
A high-Q tuned circuit in an amplifier permits to have high (a) selectivity (b) fidelity (c) sensitivity (d) frequency ranges
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asked
May 16, 2018
by
anonymous
Modern capacitors which have high capacitance in small size use a dielectric of
Modern capacitors which have high capacitance in small size use a dielectric of (A) paper (B) rubber (C) ceramic (D) Mylar
Last answer:
Modern capacitors which have high capacitance in small size use a dielectric of ceramic
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asked
Apr 12, 2018
by
anonymous
If the RF transmission is terminated in its Characteristic impedance Z, which of the following statements is...
If the RF transmission is terminated in its Characteristic impedance Z, which of the following statements is wrong : a. The input impedance of transmission line becomes Zc. b. The transmission line acts as an infinite long transmission line. c. The VSWR becomes one d. The VSWR becomes infinite
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Mar 28, 2018
by
anonymous
Among the three configuration the highest output impedance is obtained by
Last answer:
Among the three configuration, the highest output impedance is obtained by CB.
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asked
Mar 28, 2018
by
anonymous
Typical loudspeaker impedance rating is
Last answer:
Typical loudspeaker impedance rating is 8 ῼ.
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asked
Mar 28, 2018
by
anonymous
In an RLC parallel circuit, the impedance at resonance is
Last answer:
In an RLC parallel circuit, the impedance at resonance is Maximum.
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1
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Mar 28, 2018
by
anonymous
Intrinsic impedance of free space is given as
Last answer:
Intrinsic impedance of free space is given as 377 ῼ.
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asked
20 minutes
ago
by
anonymous
Leaves of many grasses are capable of folding and unfolding because (1) their mesophyll is not differentiated into palisade and spongy parenchyma (2) they have stomata on both sides of the leaf (3) they have high levels of silica (4) they have specialised bulliform cells
Leaves of many grasses are capable of folding and unfolding because (1) their mesophyll is not differentiated into palisade and spongy parenchyma (2) they have stomata on both sides of the leaf (3) they have high levels of silica (4) they have specialised bulliform cells
Last answer:
they have specialised bulliform cells
biology
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6 days
ago
by
anonymous
Gas thermometers are more sensitive than the liquid thermometers because the gases (1) have large coefficient of expansion (2) are lighter (3) have low specific heat (4) have high,specific heat
Gas thermometers are more sensitive than the liquid thermometers because the gases (1) have large coefficient of expansion (2) are lighter (3) have low specific heat (4) have high,specific heat
Last answer:
have large coefficient of expansion
physics
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6 days
ago
by
anonymous
Why do brids not have respiratory trouble at the time of flying at high altitude ? (1) Their lungs are very large (2) They fly inactively (3) They have extra air sacs (4) They use less oxygen
Why do brids not have respiratory trouble at the time of flying at high altitude ? (1) Their lungs are very large (2) They fly inactively (3) They have extra air sacs (4) They use less oxygen
Last answer:
They have extra air sacs
physics
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asked
Mar 29, 2019
by
Pallavi123
Why transformer have high and low voltage windings
Last answer:
According to our application, we need low voltage and high voltage transformer. High voltage tsansformer also called step up transformer. Low voltage transformer also called step down transformer ... tranformer used in consumer side or substation or special application like battery,etc...
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asked
Mar 28, 2018
by
anonymous
The internal resistance of the voltmeter must be very high in order to have
Last answer:
The internal resistance of the voltmeter must be very high in order to have Minimum current through the meter.
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1
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asked
Mar 25, 2018
by
anonymous
All good conductors have high?
All good conductors have high?
Last answer:
All good conductors have high conductance.
good
conductors
high
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asked
Mar 15, 2018
by
anonymous
Why does induction motor have high starting current?
Why does induction motor have high starting current?
Last answer:
In induction motor , the flux produce is quadrature to the applied voltage. Since when we are going to start motor , there is no flux present inside . So in order to lets say compensate it ... times of current to further increase flux. So that is reason for high starting current in induction motor
induction
motor
high
starting
current
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2
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asked
Sep 30, 2017
by
anonymous
does the high voltage side of Transformer winding have more number of turns?
Last answer:
yes High Voltage side of Transformer winding have more number of turns. and low voltage side of Transformer winding have less number of turns.
transformer
high
voltage
turns
winding
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1
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asked
Sep 4, 2018
by
anonymous
State two types of inductors and give their applications.
State two types of inductors and give their applications.
Last answer:
Types of inductors: i) Air cored inductor ii) Iron cored inductor iii) Ferrite cored inductor Air cored inductor: These are used for high frequency application e.g. Radio sets ... radio receiver, wide band pulse transformers, oscillators, signal generators, high frequency amplifiers, etc.
types
inductors
give
applications
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asked
May 15, 2018
by
anonymous
Four inductors each of inductance 1mH are connected in parallel and this combination is
Four inductors each of inductance 1mH are connected in parallel and this combination is connected in series with two inductors each of inductance 1mH. Calculate the equivalent inductance?
Last answer:
Four inductors each of inductance 1mH are connected in parallel and this combination is connected in series with two inductors each of inductance 1mH. Calculate the equivalent inductance? 2.25 mH
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1
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asked
Apr 14, 2018
by
anonymous
Shunt Inductors are primarily installed in transmission lines to :
Shunt Inductors are primarily installed in transmission lines to : (A) Improve Power Factor (B) Improve Stability (C) Reduce Ferranti Effect (D) Improve Voltage Profile
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asked
Mar 10, 2018
by
anonymous
Explain the electrical losses of magnetic materials used for the cores of inductors and transformer.
Explain the electrical losses of magnetic materials used for the cores of inductors and transformer.
electrical
losses
magnetic
materials
used
cores
inductors
transformer
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asked
6 days
ago
by
anonymous
When hot liquid is poured into a thick glass tumbler, it cracks because glass : (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion
When hot liquid is poured into a thick glass tumbler, it cracks because glass : (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion
Last answer:
is a bad conductor of heat so only inner surface expands
physics
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1
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asked
Jan 19
by
anonymous
The snow on the mountains does NOT melt all at once when it is heated by the sun because: (1) it becomes very hard (2) it reflects most of the heat from the sun (3) it has a low specific heat capacity (4) it has a high latent heat of fusion
The snow on the mountains does NOT melt all at once when it is heated by the sun because: (1) it becomes very hard (2) it reflects most of the heat from the sun (3) it has a low specific heat capacity (4) it has a high latent heat of fusion
Last answer:
it reflects most of the heat from the sun
physics
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1
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asked
Apr 10, 2018
by
anonymous
When measuring strain, ballast circuit use a capacitor to act as a high pass filter. This is done when:
When measuring strain, ballast circuit use a capacitor to act as a high pass filter. This is done when: a) Static strain are being measured b) Dynamic strain are being measured c) Both Static and dynamic strain are being measured d) None of the above
Last answer:
When measuring strain, ballast circuit use a capacitor to act as a high pass filter. This is done when: Dynamic strain are being measured
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1
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asked
Mar 25, 2018
by
anonymous
Sparking occurs when a load is switched off because the circuit has high?
Sparking occurs when a load is switched off because the circuit has high?
Last answer:
Sparking occurs when a load is switched off because the circuit has high inductance.
sparking
load
switched
circuit
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1
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asked
6 days
ago
by
anonymous
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because : (1) metals have higher thermal capacity than plastics (2) plastics have a lower density than metals (3) metals are good conductors of heat (4) plastics have a higher thermal conductivity than metals
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because : (1) metals have higher thermal capacity than plastics (2) plastics have a lower density than metals (3) metals are good conductors of heat (4) plastics have a higher thermal conductivity than metals
Last answer:
metals are good conductors of heat
physics
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Jan 19
by
anonymous
A speculator who enters into a purchase transaction with a view to sell in the near future when the price would have risen is called a (1) Bear (2) Bull (3) Bison (4) Boar
A speculator who enters into a purchase transaction with a view to sell in the near future when the price would have risen is called a (1) Bear (2) Bull (3) Bison (4) Boar
Last answer:
Bull
economics
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Jan 17
by
anonymous
Opportunity cost of production of a commodity is (1) the cost that the firm could have incurred when a different technique was adopted (2) the cost that the firm could have incurred under a different method of production (3) the actual cost incurred (4) the next best alternative output
Opportunity cost of production of a commodity is (1) the cost that the firm could have incurred when a different technique was adopted (2) the cost that the firm could have incurred under a different method of production (3) the actual cost incurred (4) the next best alternative output
Last answer:
the next best alternative output
economics
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1
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asked
Jan 12
by
anonymous
A hare is spotted by a tiger from a distance of 50 metres. When the tiger starts a chase, the hare also starts running. If the speed of the hare be 4 km/hr and that of a tiger 5 km/hr, how far the hare will have run before its over taken? a) 100m b) 200m c) 300m d) 400m
A hare is spotted by a tiger from a distance of 50 metres. When the tiger starts a chase, the hare also starts running. If the speed of the hare be 4 km/hr and that of a tiger 5 km/hr, how far the hare will have run before its over taken? a) 100m b) 200m c) 300m d) 400m
Last answer:
B Relative speed of the tiger = (5-4)km/hr =1 km/hr Time taken by tiger to cover 50 m, =(50/1000)hr =1/20hr In 1/20 hrs, the tiger cover a distance of (4*1/20)km =1/5km =>(1/5*1000)m =200m
time-speed-distance
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asked
Jan 9
by
anonymous
In how many ways can 8 different ballons be distributed among 7 different boxes when any box can have any number of ballons? A) 5^4-1 B) 5^4 C) 4^5-1 D) 7^8
In how many ways can 8 different ballons be distributed among 7 different boxes when any box can have any number of ballons? A) 5^4-1 B) 5^4 C) 4^5-1 D) 7^8
Last answer:
Answer: D) Here n = 7, k = 8. Hence, required number of ways = n^k =7^8
permutation
combination
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asked
Aug 17, 2020
by
omar
A synchronous generator and motor are rated 30MVA, 13.2 kV, and both have subtransient reactances of 20%. The line connecting them has a reactance of 10% on the base of the machine ratings. The motor is drawing 20MW at 0.8 power-factor leading and a terminal voltage of 12.8 kV when a symmetrical 3-phase fault occurs at the motor terminals. Use superposition concepts to find the fault current in amperes
power system analysis
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Aug 24, 2019
by
anonymous
A battery is known to have an EMF of 5.0V but when a certain voltmeter is connected to it the reading is 4.9V.
A battery is known to have an EMF of 5.0V but when a certain voltmeter is connected to it the reading is 4.9V. The battery can deliver a current of 0.40A when connected to a resistance of 12ohms. What is the resistance of the voltmeter?
battery
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May 20, 2018
by
anonymous
The time/div and voltage/div axes of an oscilloscope have been erased. When a 1 kHz, 5V p-p square wave
Last answer:
The time/div and voltage/div axes of an oscilloscope have been erased. When a 1 kHz, 5V p-p square wave calibration pulse is connected to channel 1 ofthe scope the waveform observed on the screen is ... are the same, the amplitude (pp) and period of the unknown signal are respectively. 7.5 V, 2ms
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asked
Mar 29, 2018
by
anonymous
In a NOR gate all inputs must be - - - to get high output
Last answer:
In a NOR gate all inputs must be Low to get high output
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Mar 29, 2018
by
anonymous
Binary means - - - Binary numbers have a base of 2
Last answer:
Binary means Two Binary numbers have a base of 2
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asked
Sep 23, 2017
by
anonymous
Does MOSFET have a second breakdown problem?
Last answer:
No MOSFET do not have a second breakdown problem.
mosfet
second
breakdown
problem
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asked
4 days
ago
by
anonymous
Reserpine is used to : (1) reduce high blood pressure (2) increase blood pressure when it is low (3) alleviate pain (4) cure arthritis
Reserpine is used to : (1) reduce high blood pressure (2) increase blood pressure when it is low (3) alleviate pain (4) cure arthritis
Last answer:
reduce high blood pressure
biology
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asked
May 25, 2020
by
anonymous
What happens insulators when high voltage passes through transmission lines whether it breaks or lose it's insulating property?
What happens insulators when high voltage passes through transmission lines whether it breaks or lose it's insulating property?
Last answer:
I think it will breaks when it crosses breakdown voltage .
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