Ammeter MCQ - Practice Questions & Answers

A miliammeter of range 10 mA has a coil of resistance $1 \Omega$. To use it as an ammetre of range 1 A , the required shunt must have a resistance of

A

$\frac{1}{101} \Omega$s

B

$\frac{1}{100} \Omega$

C

$\frac{1}{99} \Omega$

D

$\frac{1}{9} \Omega$

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A galvanometer has a resistance of $50 \Omega$ and its full scale deflection current is $50 \mu A$. What shunt resistance should be added so that the ammeter can have a range of $0-5 \mathrm{~mA}$ ?

A

$0.5 \Omega$

B

$1 \Omega$

C

$1.5 \Omega$

D

$2 \Omega$

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Two resistors 400 ohm and 800 ohm are connected in series with a 6V battery. It is desired to measure the current in the circuit. An ammeter of 10 ohm resistance is used for this purpose. The reading in the ammeter is:

A

2.7mA

B

3.5mA

C

4.36mA

D

4.96mA

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The sensitivity of a galvanometer of resistance 406 ohm is increased by 30 times. The shunt used is :

A

$88 \; \Omega$

B

$14$ $\Omega$

C

$6\: \Omega$

D

$16\: \Omega$

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The sensitivity of a galvanometer of resistance 406 ohm is increased by 30 times.
The shunt used is :

A

$88 \ \Omega$

B

$14 \ \Omega$

C

$6 \ \Omega$

D

$16 \ \Omega$

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Find the reading of the ammeters $A_{1}$ (in ampere) connected as shown in the network.

A

1A

B

2A

C

5A

D

6A

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In the circuit as shown in figure, the current in ammeter is:

A

$\frac{42}{32}\mathrm{A}$

B

$\frac{27}{32}\mathrm{A}$

C

$\frac{15}{32}\mathrm{A}$

D

$\frac{32}{15}\mathrm{A}$

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A moving coil galvanometer is converted into an ammeter reading up to 0.03 A by connecting a shunt of resistance 4r across it and into an ammeter reading up to 0.06 A when a shunt of resistance r is connected across it. What is the maximum current which can be sent through this galvanometer, if no shunt is used?

A

0.01 A

B

0.02 A

C

0.03 A

D

0.04 A

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A galvanometer having 50 divisions provided with a variable shunt $s$ which is used to measure the current when connected in series with a resistance of $90 \Omega$ and a battery of internal resistance $10 \Omega$ .It is observed that when the shunt resistances are $10 \Omega$ and $50 \Omega$ ,the deflection are respectively 9 and 30 division. The resistance of the Galvanometer is :