menu search
person
thumb_up_alt 0 like thumb_down_alt 0 dislike
124 views

1 Answer

The scale of a rectifier instrument is linear.

thumb_up_alt 0 like thumb_down_alt 0 dislike
← Prev Question Next Question →

Related questions

Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
180 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
93 views 1 answer
Description :

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

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
300 views 1 answer
Description :

Answer :

The rectifier instrument is not free from frequency error.

thumb_up_alt 0 like thumb_down_alt 0 dislike
167 views 1 answer
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

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
103 views 1 answer
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

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
1.1k views 1 answer
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

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
135 views 1 answer
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

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
219 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
90 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
151 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
130 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
268 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
95 views 1 answer
Description :

What is the definition of a primary instrument?

thumb_up_alt 0 like thumb_down_alt 0 dislike
73 views 0 answers
Description :

Eddy current damping cannot be used for moving iron instrument because

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
2.2k views 1 answer
Description :

Answer :

Instrument transformers are potential transformers, current transformers.

thumb_up_alt 0 like thumb_down_alt 0 dislike
62 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
218 views 1 answer
Description :

Answer :

The pointer of an indicating instrument should be very light.

thumb_up_alt 0 like thumb_down_alt 0 dislike
184 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
260 views 1 answer
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 

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 

thumb_up_alt 0 like thumb_down_alt 0 dislike
149 views 1 answer
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

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
326 views 1 answer
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

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
122 views 1 answer
Description :

List out advantages and disadvantages of bridge rectifier.

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
94 views 1 answer
Description :

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

Answer :

Peak Inverse Voltage (PIV): The maximum value of reverse voltage (for the diode in a rectifier) occurring at the peak of the negative cycle of the input cycle is called Peak Inverse Voltage. ... dc power delivered to the load to the ac input power from the secondary winding of the transformer. 

thumb_up_alt 0 like thumb_down_alt 0 dislike
282 views 1 answer
Description :

Single-phase mid-point controlled rectifier with RL load

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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
109 views 1 answer
Description :

Single-phase Midpoint controlled rectifier with Resistive load

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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
258 views 1 answer
Description :

operation of half wave rectifier type AC Voltmeter.

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 

thumb_up_alt 0 like thumb_down_alt 0 dislike
216 views 1 answer
Description :

need of rectifier and filter. 

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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
41 views 1 answer
Description :

thumb_up_alt 0 like thumb_down_alt 0 dislike
2.6k views 0 answers
Description :

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

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 

thumb_up_alt 0 like thumb_down_alt 0 dislike
100 views 1 answer
Description :

Answer :

Rectifier is a device which convert AC to DC.

thumb_up_alt 0 like thumb_down_alt 0 dislike
2.6k views 1 answer
Description :

Answer :

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

thumb_up_alt 1 like thumb_down_alt 0 dislike
100 views 1 answer
Description :

Answer :

Full wave bridge rectifier is used in mobile chqrger.

thumb_up_alt 1 like thumb_down_alt 0 dislike
131 views 2 answers
Description :

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

thumb_up_alt 1 like thumb_down_alt 0 dislike
77 views 1 answer
Description :

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

thumb_up_alt 1 like thumb_down_alt 0 dislike
83 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
128 views 2 answers
Description :

Answer :

IT CHANGES NEGATIVE CYCLE IN TO POSITIVE CYCLE FROM AC CURRENT.

thumb_up_alt 0 like thumb_down_alt 0 dislike
121 views 2 answers
Description :

What modifications are necessary if ac is applied to a PMMC instrument?

thumb_up_alt 0 like thumb_down_alt 0 dislike
47 views 0 answers
Description :

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

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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
2.3k views 1 answer
Description :

feature of PMMC instrument. 

Answer :

Consumes less power Great accuracy. High torque to weight ratio

thumb_up_alt 0 like thumb_down_alt 0 dislike
79 views 1 answer
thumb_up_alt 0 like thumb_down_alt 0 dislike
60 views 0 answers
Description :

Write any four advantages of instrument transformer.

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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
81 views 1 answer
Description :

State the meaning of secondary instrument. Classify secondary instruments.

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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
56 views 1 answer
Description :

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

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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
154 views 1 answer
Description :

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

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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
128 views 1 answer
Description :

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

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
609 views 1 answer
Description :

Name the different torque and their function in measuring instrument.

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. 

thumb_up_alt 0 like thumb_down_alt 0 dislike
66 views 1 answer
Description :

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

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. 

thumb_up_alt 0 like thumb_down_alt 0 dislike
82 views 1 answer
Description :

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

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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
136 views 1 answer
Description :

State the meaning of absolute instrument and secondary instrument. 

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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
75 views 2 answers
...