Write the relation between RMS value and Average value.

Write the relation between RMS value and Average value.
by

1 Answer

Answer :

The ratio of RMS value to average value is called the form factor of an alternating quantity.

image

by

Related questions

Write emf equation of a transformer.

Description : Write emf equation of a transformer.

Last Answer : E.M.F equation of transformer is given by where Фm= Maximum value of ac flux linking with primary and secondary winding. f = frequency of applied ac signal N= number of turns on primary or ... in primary = E1=4.44 Фm f N1volts  Voltage induced in primary = E2=4.44 Фm f N2volts

Explain the operation of transistor as a switch and as an amplifier, with neat circuit diagrams.

Description : Explain the operation of transistor as a switch and as an amplifier, with neat circuit diagrams. 

Last Answer : Explanation of transistor as a switch: The transistor can be used for two types of application viz. amplification and switching. For the amplification, transistor is biased in its active region. ... results in a large output voltage, which shows that the transistor works as an amplifier.

Explain the operation of a full wave bridge rectifier with π filter using a neat diagram. Draw input and output waveforms.

Description : Explain the operation of a full wave bridge rectifier with π filter using a neat diagram. Draw input and output waveforms.

Last Answer : During positive half-cycle of input, the secondary voltage VAB is positive, so diodes D1 and D2 forward biased and D3 and D4 reverse biased. The load current flows from terminal A ... smooth DC voltage appears across the load. The input and output waveforms are shown in the figure.

List any 4 advantages and any 4 disadvantages of Integrated circuits.

Description : List any 4 advantages and any 4 disadvantages of Integrated circuits.

Last Answer : Advantages of Integrated circuits:- 1. Extremely small size. 2. Very small weight . 3. Very low cost . 4. More reliable . 5. Lower power consumption . 6. Easy replacement ... achieved.  9.Large value of saturation resistance of transistors. 10.Voltage dependence of resistor and capacitors.

Draw the output characteristics of BJT in CE configuration and label various regions on it.

Description : Draw the output characteristics of BJT in CE configuration and label various regions on it.

Last Answer :  output characteristics of BJT in CE configuration 

State the applications of BJT.

Description : State the applications of BJT.

Last Answer : Applications of BJT: 1. As a switch 2. As an amplifier 3. As a multivibrator 4. As a oscillator 5. As a timer circuit 6. As a Logic circuits 7. Delay circuits

Draw the block diagram of regulated power supply.

Description : Draw the block diagram of regulated power supply.

Last Answer : Block diagram of regulated power supply:

Define filter and state it’s types.

Description : Define filter and state it’s types.

Last Answer : A filter circuit may be defined as a circuit, which removes (or minimizes)the unwanted a.c. component of the rectifier output and allows only the d.c. component to reach the load. Types of filters 1) ... 2) Choke input filter(series inductor filter) 3) LC filter 4) π Filter 5) RC filter

List different types of resistors and capacitors.

Description : List different types of resistors and capacitors.

Last Answer : Types of Resistors: 1. Carbon Composition resistor 2. Thin film resistor 3. Thick film resistor 4. Wire wound resistor 5. Thermistor 6. LDR 7. Photo resistor Types of capacitors: 1 ... capacitor 2. Variable capacitor 3. Air ganged capacitor 4. PVC ganged capacitor 5. Trimmer capacitor

Explain statically induced EMF and Dynamically induced EMF with neat diagrams.

Description : Explain statically induced EMF and Dynamically induced EMF with neat diagrams.

Last Answer : Statically Induced EMF:- When changing magnetic field links with a stationary coil an emf is induced. This emf is called statically induced emf. Statically induced EMF is of two types: Self-induced ... cuts the field and an emf is induced. This emf is called dynamically induced emf.    

Explain the working of auto-transformer and state any two advantages of it.

Description : Explain the working of auto-transformer and state any two advantages of it. 

Last Answer : Working of auto transformer :-It is a transformer with one winding only, part of this being common to both primary and secondary. In this transformer the primary and secondary are not electrically ... are less, so the efficiency of auto transformer is higher than that of two winding transformer.

Define transformation ratio of a transformer.

Description : Define transformation ratio of a transformer.

Last Answer : Transformation Ratio (K) of a transformer: It is the ratio of secondary number of turns to primary number of turns. (OR) It is the ratio of secondary voltage to primary voltage. (OR ) It is the ratio of primary current to secondary current. OR

Define FHP motor and list various types.

Description : Define FHP motor and list various types.

Last Answer : Any motor rated less than one horse power may be called as fractional horse power motors(FHP) various types of FHP motors are: 1.Split phase induction motor 2. Capacitor start induction motor 3. Capacitor start capacitor run induction motor 4. Shaded pole induction motor. 

Define (i) Permeability (ii) Reluctance.

Description : Define (i) Permeability (ii) Reluctance.

Last Answer : Permeability: The capability of the magnetic material to conduct the magnetic flux is known as permeability (OR) It is defined as ratio of magnetic flux density B in a medium to the magnetic flux intensity ... as the property of a material due to which it opposes the creation of magnetic flux in it.

Define EMF and state its unit.

Description : Define EMF and state its unit.

Last Answer : Electromotive force(EMF): A potential difference generated by a source of electrical energy across its terminals which tends to produce an electric current in a circuit is called electromotive force. Unit of EMF is Volt

Draw: (i) Input characteristics of transistor in CE mode. (ii) Output characteristics of transistor in CE mode and show different regions on it.

Description : Draw: (i) Input characteristics of transistor in CE mode. (ii) Output characteristics of transistor in CE mode and show different regions on it.

Last Answer : (i) Input characteristics of transistor in CE mode.   (ii) Output characteristics of transistor in CE mode and show different regions on it.  

Draw and explain: bridge rectifier with shunt capacitor filter.

Description : Draw and explain: bridge rectifier with shunt capacitor filter.

Last Answer : Operation of bridge rectifier with capacitor filter is explained in different intervals with the help of the following wave form. Operation in interval at 0 to A: ... filter is very close to theideal dc voltage waveform as most of the ripple is removed from rectified output.

Explain ideal voltage source with suitable diagram.

Description : Explain ideal voltage source with suitable diagram.

Last Answer : A voltage source is a two terminal device which can maintain a fixed voltage. An ideal voltage source can maintain the fixed voltage independent of the load resistance or the output current. ... the terminal voltage remains constant equal to V volts without load (RL = ∞) or with load

State the need for filters and list the different types of filters.

Description : State the need for filters and list the different types of filters.

Last Answer : Need for filters 1) Output of all rectifiers is pulsating dc voltage and most of citcuits which work on dc requires pure dc voltage. 2) So in order to get pure dc waveform, filters are connected at the ... 2) Choke input filter(series inductor filter) 3) LC filter 4) π Filter 5) RC filter

List the different transistor configurations.

Description : List the different transistor configurations.

Last Answer : The three different transistor configurations are, 1. Common emitter configuration(CE) 2. Common base configuration(CB) 3. Common collector configuration(CC)

State why transistor is called as a bipolar device.

Description : State why transistor is called as a bipolar device.

Last Answer : In case of transistor (BJT), the current conduction takes place due to both electrons and holes, ie, due to both positive as well as negative polarity charge carriers. Therefore transistor is called a bipolar device. 

List any two applications of LED.

Description : List any two applications of LED.

Last Answer : 1) LEDs are used in 7 segment display and dot matrix display. 2) They are used in opto couplers. 3) They are used for indicating power ON/OFF conditions. 4) They are used in infrared remote controls. 5) They are used as indicators in various electronic circuits.

Define passive components and classify them.

Description : Define passive components and classify them.

Last Answer : Passive components: The components which by themselves are not capable of amplifying (or processing) electrical signals are known as passive components. They require external energy source for their functioning. These are bidirectional devices.  Classification: Resistors, Capacitors, Inductors etc.

Compare analog and digital ICs.

Description : Compare analog and digital ICs.

Last Answer : Sr. No. Analog ICs Digital ICs  1 Analog ICs accept and output analog data through its pins. Digital ICs deal with only logic data inputs and outputs.  2 Almost every ... IC for dedicated application. Works with TTL logic level and works in voltage range of 0-5V only.

Compare autotransformer with two winding transformer.

Description : Compare autotransformer with two winding transformer.

Last Answer : Two winding transformer Auto transformer 1.It has two separate windings : a) primary, b)secondary.  1. An auto transformer has single winding which acts both as primary and secondary ... varied. 3. They find application as boosters in AC feeders to increase the voltage levels.

Define: (i) Efficiency (ii) Voltage regulation of transformer.

Description : Define: (i) Efficiency (ii) Voltage regulation of transformer.

Last Answer : i) Efficiency : It is the ratio of output power to the input power of the transformer.It is denoted by η. ii) Voltage Regulation of transformer: The ratio of the change in Secondary Terminal ... So where, VNL = No Load Secondary voltage VFL = Full load secondary voltage

State Faraday's first and second law of electromagnetic induction.

Description : State Faraday's first and second law of electromagnetic induction.

Last Answer : i)Faraday's First Law: Whenever a conductor cuts the magnetic lines of force or is cut by the magnetic lines of force or flux linking with conductor changes, an emf is induced in the conductor.  ... Law: The magnitude of induced emf is directly proportional to the rate of change of flux.

State the types of single phase induction motors.

Description : State the types of single phase induction motors.

Last Answer : The types of single phase induction motors are: i) Resistance split phase induction motor. ii) Capacitor split phase inductor motor. a. Capacitor start induction run motor b. permanent capacitor motor c. capacitor start capacitor run induction motor iii) Shaded pole induction motor.

State the working principle of I ø transformer.

Description : State the working principle of I ø transformer.

Last Answer : Working principle of transformer : Transformer works on the principle of mutual electromagnetic induction. When AC voltage is applied to the primary winding of a transformer it causes ac current to flow ... in the secondary winding. The current flows in the secondary circuit if load is connected.

Define: (i) Inductive reactance (ii) Impedance.

Description : Define: (i) Inductive reactance (ii) Impedance.

Last Answer : i) Inductive reactance: Inductive reactance is the opposition offered by an inductor to alternating current . It is denoted by XL and given by XL = 2πf LΩ = ωL Ω ii)Impedance: It is the total opposition offered to flow of AC current in an AC circuit. It is denoted by Z and the unit is ohm. 

With the help of waveforms and phasor diagrams, show the phase relationship between voltage and current in pure inductive circuit.

Description : With the help of waveforms and phasor diagrams, show the phase relationship between voltage and current in pure inductive circuit.

Last Answer : Phasor Diagram:  

List the types of induced emf.

Description : List the types of induced emf.

Last Answer : The types of induced emf are : i) Statically induced emf , ii) Dynamically induced emf

Define: (i) Electromagnetism (ii) Magnetic flux.

Description : Define: (i) Electromagnetism (ii) Magnetic flux.

Last Answer : i)Electromagnetism : It is the magnetism generated by electricity. OR  It is defined as the phenomenon associated with electric and magnetic fields and their interactions with each other. ii) Magnetic flux : The total number of magnetic lines of force in a magnetic field is called magnetic flux.

The RMS value of a sine-wave current may also be expressed as the _____________. A. average value B. maximum value C. effective value D. instantaneous value

Description : The RMS value of a sine-wave current may also be expressed as the _____________. A. average value B. maximum value C. effective value D. instantaneous value

Last Answer : Answer: C

Alternating current measured in a transmission line will be a) Peak value b) Average value c) RMS value d) Zero

Description : Alternating current measured in a transmission line will be a) Peak value b) Average value c) RMS value d) Zero

Last Answer : c) RMS value

Define RMS value and Average value of AC waveform.

Description : Define RMS value and Average value of AC waveform.

Last Answer : 1. RMS value:- For an alternating current, the RMS value is defined as that value of steady current (DC) which produces the same heat or power as is produced by the alternating current during the ... by averaging all the instantaneous values of its wave over a period of half cycle. Iav=0.637 Imax

Define following terms used in A.C. circuits : (i) Cycle (ii) Rms value (iii) Phase difference (iv) Average value

Description : Define following terms used in A.C. circuits : (i) Cycle (ii) Rms value (iii) Phase difference (iv) Average value

Last Answer : (i) Cycle:   A complete set of variation of an alternating quantity which is repeated at regular interval of time is called as a cycle. OR  Each repetition of an alternating quantity ... charge as is transferred by the alternating current during the same time under the same conditions. 

Define : i) Average value ii) RMS value of an AC Wave.

Description : Define : i) Average value ii) RMS value of an AC Wave.

Last Answer : i) Average value: The average value is defined as the average of all instantaneous values during one alternation . That is, the ratio of the sum of all considered instantaneous values to the ... as produced by the alternating current when flowing through the same resistance for the same time.

AC voltmeters are generally calibrated to read the ________. A. instantaneous voltage B. average voltage C. RMS voltage D. peak voltage

Description : AC voltmeters are generally calibrated to read the ________. A. instantaneous voltage B. average voltage C. RMS voltage D. peak voltage

Last Answer : Answer: C

External noise fields are measured in terms of _______. A. rms values B. dc values C. average values D. peak values

Description : External noise fields are measured in terms of _______. A. rms values B. dc values C. average values D. peak values

Last Answer : D. peak values

The voltage at any point in an ac circuit will be a) Peak voltage b) RMS voltage c) Average voltage d) Source voltage

Description : The voltage at any point in an ac circuit will be a) Peak voltage b) RMS voltage c) Average voltage d) Source voltage

Last Answer : b) RMS voltage

In which of the following waveforms is RMS voltage equal to the average voltage?

Description : In which of the following waveforms is RMS voltage equal to the average voltage? A) Triangle wave B) Square wave C) Sine wave D) None of these

Last Answer : In which of the following waveforms is RMS voltage equal to the average voltage? A) Triangle wave B) Square wave C) Sine wave D) None of these

What is RMS value ?

Description : What is RMS value ?

Last Answer : If a certain amount of heat is generated in a certain amount of DC current flows through a certain register at a certain time , if the same amount of heat is generated in the current flowing through the ... at the same time, then that DC current is called the effective or RMS value of AC current.

What does the Voltmeter in AC mode show? Is it RMS value or peak value?

Description : What does the Voltmeter in AC mode show? Is it RMS value or peak value?

Last Answer : Multimeter in AC mode shows RMS value of the voltage or current. Also when it is DC mode it will show the RMS value only.

Find the power of a wave given that the RMS value of E and H are 6 and 4.5 respectively. a) 24 b) 27 c) 29 d) 32

Description : Find the power of a wave given that the RMS value of E and H are 6 and 4.5 respectively. a) 24 b) 27 c) 29 d) 32

Last Answer : b) 27

In a half wave rectifier the rms value of AC component of the waves (a) Zero (b) Equal to DC value (c) More than DC value (d) Less than DC value

Description : In a half wave rectifier the rms value of AC component of the waves (a) Zero (b) Equal to DC value (c) More than DC value (d) Less than DC value

Last Answer : b) Equal to DC value

6 The value of flux involved in the emf equation of a transformer is A. rms value B. rms value C. Maximum value D. Instantaneous value

Description : 6 The value of flux involved in the emf equation of a transformer is A. rms value B. rms value C. Maximum value D. Instantaneous value

Last Answer : C) maximum value

Define : i) Maximum Value ii) RMS Value of ac supply

Description : Define : i) Maximum Value ii) RMS Value of ac supply

Last Answer : i) Maximum Value :- The maximum or peak value attained by an alternating quantity during positive or negative half cycle, is called maximum value or peak value.  ii) RMS Value of ac ... as produced by the alternating current when flowing through the same resistance and for the same time. 

RMS value formula

Description : RMS value formula

Last Answer : RMS value formula