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# Ammeter

## Related questions

Write any two disadvantages of ammeter shunts.

With neat diagram, explain the working of clip-on ammeter.

Describe procedure for calibration of ammeter with diagram.

How range of A.C. ammeter & A.C. voltmeter is extended? Draw suitable diagram.

State the application of phase sequence indicator; clip on ammeter, frequency meter & P.F. meter.

Draw a typical electric circuit including ammeter and voltmeter.

What should be the ideal resistance of ammeter ?

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State the use of:- (i) Clip-on-ammeter (ii) Phase sequence indicator

A 10A DC Ammeter has a resistance of 0.1 Ω is to be extended to 50 A, the required shunt wire is A) Manganin wire of 20 m Ω B) Constantan wire of 20 m Ω C) Manganin wire of 25 m Ω D) Constantan wire of 25 m Ω

Measurement of power by voltmeter and ammeter method in a circuit resulted in calculated maximum errors of ±1 % and ± 2 %, respectively. The likely error in calculated power is (A) ± 3 % (B) ± 0.022 % (C) ± 1.5 % (D) ± 0.22 %

The current transformer that is used to measure a 100 A current by 5 A ammeter is a_____.

A 0-10 A ammeter has a guaranteed accuracy of 1% of full scale deflection, the limiting error while reading 2.5 A will be (a) 1% (b) 2% (c) 4% (d) None of these

What will happen if a voltmeter is connected like an ammeter in series of the load ? (a) The meter will burn out. (b) The measurement will be too high. (c) The same current will flow as would have been with ammeter in circuit. (d) There will be almost no current in the circuit.

Internal resistance of a micro-ammeter is 500 ohm. Shunt resistance required to increase its range from 0-100 µA to 0-10 A will be approximately (a) 0.05 Ω (b) 0.005 Ω (c) 0.5 Ω (d) 5.0 Ω

Hot wire ammeter is used (a) only for dc circuit (b) only for ac circuit (c) both (a) and (b) (d) Either (a) or (b)

A permanent magnet moving coil ammeter has a coil resistance of 99 ohm and Full Scale Deflection (FSD) current of 0.1mA. Shunt resistance is 1 ohm. Current through the meter at 0.5 F.S.D is:

The measurement range of an ammeter can be increased by using a:

Clamp on ammeter is used for measurement of:

An ammeter has a current change of 0—5A and its internal resistance is 0.2 ohm. In order to Change the range to 0-25 A, wear need to add a resistance of  A) 0.8 ohm in series with the meter B) 1.0 ohm in series with the meter C) 0.04 ohm in parallel with the meter D) 0.05 ohm in parallel with the meter

You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed? A.9 V B.900 mV C.0 V D.18 V

Which of the following will happen if a voltmeter is connected like an ammeter in series to the load ? (A) There will be almost no current in the circuit. (B) The meter will burn. (C) The measurement will be trio high. (D)  A very high current will flow.

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