Ammeter MCQ

21. An ammeter has a current range of 0—5 A, and its internal resistance is 0.2 ohm in order to change the range to 0—25 A, we need to add a resistance of

  1. 0.05 ohm in parallel with the meter
  2. 0.04 ohm in parallel with the meter
  3. 1.0 ohm in series with the meter
  4. 0.8 ohm in series with the meter
Answer. a

22. An ammeter of 0—25 A range has guarantee accuracy of 1% of full scale reading. The current measured is 5 A. The limiting error is

  1. 0.05
  2. 0.04
  3. 0.025
  4. 0.02
Answer. a

23. A galvanometer may be converted into ammeter or voltmeter. In which of the following cases the resistance of the device will be the largest?

  1. An ammeter of range 10 A
  2. A voltmeter of range 5 V
  3. An ammeter of range 5 A
  4. A voltmeter of range 10 V
Answer. d

24. For a given frequency, the deflection torque of an induction ammeter is directly proportional to:

  1. (current)2
  2. (current)3
  3. (current)½
  4. (current)
Answer. a

25. Which of the following is correct about a clamper?

  1. It preserves the signal shape But changes the DC level.
  2. It changes signal shape But preserves the DC level
  3. It preserves signal shape as well as DC level
  4. It changes both signal shape and DC level
Answer. a

26. The deflecting torque of an ammeter is directly proportional to the current passing through it and the instrument has a full-scale deflection of 90° for a current of 10 A. What deflection will occur for a current of 5 A when the instrument has gravity control?

  1. 30°
  2. 45°
  3. 60°
  4. 90°
Answer. a

27. A meter  movement with current sensitivity 100 μA and internal resistance 100 Ω is required to measure the current of 10 mA. What will the shunt resistance be equal to?

  1. 1 Ω
  2. 0.98 Ω
  3. 0.99 Ω
  4. 1.010101 Ω
Answer. d

28. A 1 mA D’Arsonval movement has a resistance of 100 ohms. It is to be converted to a 10 V voltmeter. The value of multiplier resistance is

  1. 999 Ω
  2. 9999 Ω
  3. 9900 Ω
  4. 990 Ω
Answer. c

29. If an ammeter & a capacitor are connected in series on D.C. circuit the ammeter will

  1. Give continuous reading
  2. Initially give& then will come to zero
  3. Not give any reading
  4. Give only half the reading
Answer. b

30. The range of a permanent magnet moving coil instrument used as an Ammeter can be increased by

  1. Connecting a high resistance in series with the instrument
  2. Connecting a low resistance in series with the instrument
  3. Connecting a low resistance in parallel with the instrument
  4. Connecting a high resistance in parallel with the instrument
Answer. c

Adblocker detected! Please consider reading this notice.

We've detected that you are using AdBlock Plus or some other adblocking software which is preventing the page from fully loading.

We don't have any banner, Flash, animation, obnoxious sound, or popup ad. We do not implement these annoying types of ads!

We need fund to operate the site, and almost all of it comes from our online advertising.

Please add to your ad blocking whitelist or disable your adblocking software.