The rectifier instrument is not free from?

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1 Answer

Answer :

The rectifier instrument is not free from frequency error.

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Related questions

The scale of a rectifier instrument is?

Last Answer : The scale of a rectifier instrument is linear.

A Pyrheliometer is an instrument to measure :

Description : A Pyrheliometer is an instrument to measure :  (A) temperature of solar photovoltaic cell  (B) intensity of direct solar radiation at normal incidence  (C) intensity of indirect solar radiation  (D) efficiency of a solar photovoltaic cell

Last Answer : A Pyrheliometer is an instrument to measure : intensity of direct solar radiation at normal incidence 

In a PMMC instrument, the damping provided is :

Description : In a PMMC instrument, the damping provided is :  (A) air damping (C) eddy current damping (B) fluid damping (D) magnetic damping using a magnet

Last Answer : In a PMMC instrument, the damping provided is : eddy current damping 

A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an

Description : A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an ammeter with full scale deflection of 100 mA, the required shunt resistance is (A) 1 Ω (B) 1.001 Ω (C) 0.5 Ω (D) 10 Ω

Last Answer : A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an ammeter with full scale deflection of 100 mA, the required shunt resistance is 1.001 Ω

Eddy current damping cannot be used for moving iron instrument because

Description : Eddy current damping cannot be used for moving iron instrument because

Last Answer : Eddy current damping cannot be used for moving iron instrument because the presence of a permanent magnet required for such purpose would affect the deflection and hence the reading of the instrument

Identify the instrument that does not exist (A) Dynamo-meter type ammeter (B) Dynamo-meter type

Description : Identify the instrument that does not exist (A) Dynamo-meter type ammeter (B) Dynamo-meter type wattmeter (C) Moving-iron voltmeter (D) Moving-iron wattmeter

Last Answer : Identify the instrument that does not exist (A) Dynamo-meter type ammeter (B) Dynamo-meter type wattmeter (C) Moving-iron voltmeter (D) Moving-iron wattmeter

Instrument transformers are?

Last Answer : Instrument transformers are potential transformers, current transformers.

A multirange instrument has?

Last Answer : A multirange instrument has multiple shunt or series resistances inside the meter.

The gravity controlled instrument has crowded scale because current is proportional to?

Last Answer : The gravity controlled instrument has crowded scale because current is proportional to sine of deflection angle.

If an instrument has cramped scale for larger values, then it follows?

Last Answer : If an instrument has cramped scale for larger values, then it follows logarithmic law.

The ratio of maximum displacement deviation to full scale deviation of the instrument is called?

Description : The ratio of maximum displacement deviation to full scale deviation of the instrument is called?

Last Answer : The ratio of maximum displacement deviation to full scale deviation of the instrument is called linearity.

A moving iron instrument can be used for?

Last Answer : A moving iron instrument can be used for both D.C. and A.C.

The disc of an instrument using eddy current damping should be of?

Last Answer : The disc of an instrument using eddy current damping should be of conducting and non-magnetic material.

In a portable instrument, the controlling torque is provided by?

Last Answer : In a portable instrument, the controlling torque is provided by spring.

The pointer of an indicating instrument should be?

Last Answer : The pointer of an indicating instrument should be very light.

Which is an instrument which measures insulation resistance of an electric circuit relative to earth and one another?

Last Answer : Meggar is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another.

A moving-coil permanent-magnet instrument can be used as flux-meter?

Last Answer : A moving-coil permanent-magnet instrument can be used as flux-meter by eliminating the control springs.

A moving-coil permanent-magnet instrument can be used as what by using a low resistance shunt?

Last Answer : A moving-coil permanent-magnet instrument can be used as ammeter by using a low resistance shunt.

List out advantages and disadvantages of bridge rectifier.

Description : List out advantages and disadvantages of bridge rectifier.

Last Answer : Advantages :  1. Bridge rectifier can be used in applications allowing floating output terminals i.e. not output terminal is grounded.  2. The need of center-tapped transformer is eliminated.  ... The value of the diodes used should be precise , else there will be an error in rectification

Define PIV, TUF, ripple factor, efficiency of rectifier.

Description : Define PIV, TUF, ripple factor, efficiency of rectifier.

Last Answer : PIV: Peak Inverse Voltage (PIV) is defined as the maximum negative voltage which appears across non-conducting reverse biased diode. TUF : Transformer Utilization Factor (TUF) is defined as the ratio of DC output ... Efficiency of rectifier: η = DC output power/ AC input power = PLdc / Pac

Single-phase mid-point controlled rectifier with RL load

Description : Single-phase mid-point controlled rectifier with RL load

Last Answer : Single-phase mid-point controlled rectifier with RL load : The circuit configuration of single-phase midpoint controlled rectifier is shown in the figure. During positive half-cycle of ... some part of next positive half-cycle of voltage with reversed polarity can appear across load.

Single-phase Midpoint controlled rectifier with Resistive load

Description : Single-phase Midpoint controlled rectifier with Resistive load

Last Answer : Single-phase Midpoint controlled rectifier with Resistive load:  1) During positive half cycle of AC supply, a is positive with respect to b , this makes T1 forward biased and T2 is reverse ... voltage reverses the polarity and T2 is turned off. The operation is as shown in waveforms.

operation of half wave rectifier type AC Voltmeter.

Description : operation of half wave rectifier type AC Voltmeter.

Last Answer :  Half-wave Rectifier Voltmeter The d'Arsonval meter movement only responds to the average or dc value of the current through the moving coil. In order to measure alternating ... ) input voltage signal alternating signal needs to be rectified first by using diode rectifier to produce 

need of rectifier and filter.

Description : need of rectifier and filter. 

Last Answer : Need of rectifier: Every electronics circuit needs a D.C. power source for its operation. The rectifier circuit is used to convert A.C. supply to unidirectional pulses .  Need of filter: A filter ... only the D.C. components to reach the load. So filter is used to provide ripple free output.

Explain full wave bridged rectifier with the help of circuit diagram and input output waveform.

Description : Explain full wave bridged rectifier with the help of circuit diagram and input output waveform.

Last Answer : 1. In positive half cycle (0 to Π): The end A of the secondary winding becomes positive and end B negative. This makes diode D1 and D4 forward biased while diode D2 and D3 are reverse biased. These two diodes will ... D2 and D3 when it is conducting is as follows.  B - D2 - RL - D3 - A 

An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to

Description :  An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V 

Last Answer :  An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V 

When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a

Description : When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is

Last Answer : When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is √3/2

In a half-wave rectifier, if an a.c supply is 60 Hz. Then what is the a.c ripple at output?

Description : In a half-wave rectifier, if an a.c supply is 60 Hz. Then what is the a.c ripple at output? (A) 30 Hz (B) 60 Hz (C) 20 Hz (D) 15 Hz

Last Answer : In a half-wave rectifier, if an a.c supply is 60 Hz. Then what is the a.c ripple at output? (A) 30 Hz (B) 60 Hz (C) 20 Hz (D) 15 Hz

What is rectifier?

Last Answer : Rectifier is a device which convert AC to DC.

why rectifier is used in power supply ?

Last Answer : Rectifier is use in power supply to convert Alternating current (AC) to Direct Current (DC) .

which rectifier used in mobile charger?

Last Answer : Full wave bridge rectifier is used in mobile chqrger.

which rectifier is more efficient?

Last Answer : the efficiency of centre tapped full wave rectifier and bridge rectifier is same that is 80.2% but the because of the use of Central trap the Transformer utilisation factor It's become low.hence we can say the bridge rectifier is more efficient

what is rectifier and its types?

Last Answer : rectifier is a device which converts AC voltage to pulsating DC voltage using one or more diode diode conducts only in unit direction that is forward bias condition practically it does not conduct ... types one is with using two diodes and Centre tap Transformer and another is bridge wave rectifier

can rectifier convert dc to ac?

Last Answer : NO IT ONLY CONVERT FROM AC TO DC BECAUSE DIODE WHICH ARE USED IN IT, ARE UNIDIRECTIONAL.

how does rectifier convert ac to dc?

Last Answer : IT CHANGES NEGATIVE CYCLE IN TO POSITIVE CYCLE FROM AC CURRENT.

What are the test and measuring instrument required in an Electrical depots?

Description : What are the test and measuring instrument required in an Electrical depots?

Last Answer : Ans. Following are the test and measuring instruments required in an Electrical depots. a. Test lamp b. Line Tester c. Continuity tester d. Volt meter e. Ammeter f. Earth megger g. Megger h. Lux meter i. Power analyzer j. Infrared thermometer

List two advantages of PMMC instrument.

Description : List two advantages of PMMC instrument.

Last Answer : 1. It has uniform scale. 2. Power consumption is low 3. It can be obtained in wide ranges. 4. High sensitivity & accuracy 5. It is unaffected by external magnetic field. 6. Additional damping device not required. 7. Hysteresis problem is not there.

need of calibration and explain the procedure to calibrate the instrument.

Description : need of calibration and explain the procedure to calibrate the instrument.

Last Answer : Need of calibration: Every measuring device degrades over time due to normal wear and tear. These changes can be caused by various reasons such as electric or mechanical shock or a hazardous manufacturing ... different magnitude are used to calculate the resistance based on ohm's law.

feature of PMMC instrument.

Description : feature of PMMC instrument. 

Last Answer : Consumes less power Great accuracy. High torque to weight ratio

Write any four advantages of instrument transformer.

Description : Write any four advantages of instrument transformer.

Last Answer : Advantages of instrument transformer: 1. Extension of instrument range is possible. 2. Isolation of instruments from high voltage side. 3. Power loss is less as compared to shunts and multipliers. 4 ... measurement. 5. It is economical method of range extension. 6. Increases in safety of operator.

State the meaning of secondary instrument. Classify secondary instruments.

Description : State the meaning of secondary instrument. Classify secondary instruments.

Last Answer : Secondary instruments: - Gives reading directly of the quantity being measured. - Calibrated with respect to absolute instruments  Classification of Secondary instruments:  1. Depending on the ... on permissible error: i) Standard meters ii) Substandard meters iii) First grade instruments.

State the function of former and control spring in PMMC instrument.

Description : State the function of former and control spring in PMMC instrument.

Last Answer : Function of Former: To support the coil and provide eddy current damping.  Function of Control Spring: To provide control torque or force and in some instruments springs can be used as current leads.

‘PMMC instrument is not suitable to measure AC quantity’. State the reason.

Description : ‘PMMC instrument is not suitable to measure AC quantity’. State the reason.

Last Answer : The direction of force exerted on moving coil depends on the direction of current flowing through moving coil. If the direction of magnetic field is kept constant, it produces unidirectional torque if the current is ... on the coil in one cycle to zero. Hence the meter cannot read A.C. quantities.

Describe spring control method of producing controlling torque in measuring instrument. Write any two properties required for spring material.

Description : Describe spring control method of producing controlling torque in measuring instrument. Write any two properties required for spring material.

Last Answer : A)Spring control method: As shown in the figure, the inner ends of the both springs are attahced to the spindle, while outer end of upper spring is attached to the lever and outer ... of spring material: 1.Non Magnetic material 2.Low specific resistance 3.Low temperature coefficient of resistance

Name the different torque and their function in measuring instrument.

Description : Name the different torque and their function in measuring instrument.

Last Answer : List of torques in analog instruments:  1. Deflecting torque  2. Controlling / restraining torque.  3. Damping torque.  1. Deflecting torque:  - To create deflection of pointer ... .  - Bring the pointer to standstill quickly.  - To minimize oscillations about final position. 

Give the classification of the errors used in measuring instrument & state the reason for their occurrence.

Description : Give the classification of the errors used in measuring instrument & state the reason for their occurrence.

Last Answer : Types of errors in measuring instruments:  A) Gross error: These are due to mistakes on the part of person using the instrument.  B) Systematic Error:  i) Instrumental Error: These ... multiplying factor.  C) Random error: These persist even after gross and systematic errors are removed. 

Name the material used for :- (i) Moving coil (ii) Permanent magnet in PMMC instrument.

Description : Name the material used for :- (i) Moving coil (ii) Permanent magnet in PMMC instrument.

Last Answer : (i) Material used for Moving coil: Copper, Aluminum( some times)  (ii) Permanent magnets are made of special alloys such as :  Aluminum-Nickel-Cobalt (Alnicos)  Strontium-Iron  Neodymium-Iron-Boron  Samarium-Cobalt.

State the meaning of absolute instrument and secondary instrument.

Description : State the meaning of absolute instrument and secondary instrument. 

Last Answer : Absolute instruments:   These instruments read the quantity under measurement indirectly i.e. in terms of deflection, degrees and meter constant. The actual value under measurement can be calculated ... of operation (b) Depending upon permissible percentage error. (c) Depending upon application.

State the advantages of instrument transformer in using for extension of range of meters.

Description : State the advantages of instrument transformer in using for extension of range of meters. 

Last Answer : Advantages of instrument transformer: 1. Extension of instrument range is possible. 2. Isolation of instruments from high voltage side. 3. Power loss is less as compared to shunts and multipliers. 4 ... measurement. 5. It is economical method of range extension. 6. Increases in safety of operator.

Explain magnetic effect employed in measuring instrument.

Description : Explain magnetic effect employed in measuring instrument.

Last Answer : Magnetic Effect:  I) In PMMC meters:  ➢ When a current is passed through a conductor, magnetic field is produced round the conductor. Due to this field when current ... field it experiences a mechanical force.  Examples: Electrodynamometer type instruments, Induction type instrument.