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Sheet 2 PDF

The document contains a series of electrical engineering problems related to ammeter and voltmeter design and calculations. It includes tasks such as calculating shunt resistance, designing an Aryton shunt for different current ranges, determining percentage errors due to ammeter insertion, and finding multiplier resistance for voltmeters. Each problem involves specific circuit parameters and requires analytical solutions based on electrical principles.

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Shahd Mohamed
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8 views2 pages

Sheet 2 PDF

The document contains a series of electrical engineering problems related to ammeter and voltmeter design and calculations. It includes tasks such as calculating shunt resistance, designing an Aryton shunt for different current ranges, determining percentage errors due to ammeter insertion, and finding multiplier resistance for voltmeters. Each problem involves specific circuit parameters and requires analytical solutions based on electrical principles.

Uploaded by

Shahd Mohamed
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Sheet 2

1. A 1mA meter movement with an internal resistance of 100Ω is to be converted


into a 0 – 100mA. Calculate the value of shunt resistance required.

2. Design an Aryton shunt to provide an ammeter with current ranges 0 – 10mA,


100mA and 500mA using a D’Arsonval movement having an internal resistance of
50Ω and full scale deflections of 1mA.

3. An ammeter that has an internal resistance of 78Ω is used to measure the current
through resistor Rc. Determine the percentage of error of the reading due to ammeter
insertion.

Ra = 1 k 

E=3V Rb = 1 k  Rc =1 k 

4. A basic D’Arsonval movement with a full scale deflection of 50μA and internal
resistance of 500Ω is used as a voltmeter. Determine the value of the multiplier
resistance needed to measure a voltage range 0-10V.

5. Calculate the value of multiplier resistance for the multiple range DC voltmeter
circuit as shown in figure below. Given Rm =1kΩ and Ifs = 50μA

R1
3v
10 v
R2
S

+ 30 v
R3

Im Rm
-
6. In the circuit below, two voltmeters are be used to measure the voltage across
resistor RB

RA

E
RB

Meter A: S=1kΩ/V, range =10V


Meter B: S=20kΩ/V, range =10V

a) Calculate voltage across resistor RB without any voltmeter is connected.


b) Calculate voltage across resistor RB with voltmeter A is used.
c) Calculate voltage across resistor RB with voltmeter B is used.
d) Determine the percentage of error of the reading of each voltmeter due to
voltmeter insertion.

7. In the circuit below, what is the value Rx if the meter reads half-scale?

Rm =2 k 
Rz = 4.6 k  Ifs =50 A

Rsh = 500 
R = 1 k

E = 1.5 V Rx

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