Electronic Instruments

1. A CRO is used to measure ___________.

  1. Voltage
  2. Frequency
  3. Phase
  4. All of above

Correct answer: (D)
All of above

2. A galvanometer in series with a high resistance is called ___________.

  1. An ammeter
  2. A voltmeter
  3. A wattmeter
  4. None of the above

Correct answer: (B)
A voltmeter

3. A galvanometer of resistance G is shunted by a very small resistance S. The resistance of the resulting ammeter is ___________.

  1. GS/(G+S)
  2. G+S
  3. G-S
  4. None of the above

Correct answer: (A)
GS/(G+S)

4. A series ohmmeter circuit uses a 3 V battery and a 1 mA meter movement. What is the half-scale resistance for this movement?

  1. 3 kO
  2. kO
  3. kO
  4. 6 kO

Correct answer: (A)
3 kO

5. A voltmeter has a resistance of G ohms and range V volts. The value of resistance required in series to convert it into voltmeter of range nV is ___________.

  1. nG
  2. G/n
  3. G/(n-1)
  4. (n-1)G

Correct answer: (D)
(n-1)G

6. A voltmeter is connected in a ___________ with the circuit component across which potential difference is to be measured

  1. Parallel
  2. Series
  3. Series or parallel
  4. None of the above

Correct answer: (A)
Parallel

7. A voltmeter should have ___________ resistance

  1. Zero
  2. Very high
  3. Very low
  4. None of the above

Correct answer: (B)
Very high

8. A VTVM has input resistance than that of a multimeter

  1. More
  2. Less
  3. Same
  4. None of the above

Correct answer: (A)
More

9. A VTVM is never used to measure ___________.

  1. Voltage
  2. Current
  3. Resistance
  4. None of the above

Correct answer: (B)
Current

10. An ammeter has a resistance of G ohms and range of I amperes. The value of resistance required in parallel to convert it into an ammeter of range nI is ___________.

  1. nG
  2. (n-1)G
  3. G/(n-1)
  4. G/n

Correct answer: (C)
G/(n-1)

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