Electronic Instruments

11. An ammeter is connected in with the circuit element whose current we wish to measure

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

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12. An ammeter should have ___________ resistance

1. Infinite
2. Very large
3. Very low
4. None of the above

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13. An ideal ammeter has resistance

1. Low
2. Infinite
3. Zero
4. High

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14. For display of signal pattern ___________ voltage is applied to the horizontal plates of a CRO

1. Sinusoidal
2. Rectangular
3. Sawtooth
4. None of the above

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15. If 2% of the main current is to be passed through a galvanometer of resistance G, then resistance of the shunt required is ___________.

1. G/50
2. G/49
3. 49 G
4. 50 G

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16. If a multimeter has a sensitivity of 1000 O per volt and reads 50 V full scale, its internal resistance is ___________.

1. 20 kO
2. 50 kO
3. 10 kO
4. None of the above

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17. If the full-scale deflection current of a multimeter is 50 µA, its sensitivity is ___________.

1. 10 kO/V
2. 100 kO/V
3. 50 kO/V
4. 20 kO/V

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18. If the negative potential on the control grid of CRT is increased, the intensity of spot ___________.

1. Is increased
2. Is decreased
3. Remains the same
4. None of the above

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19. The horizontal plates of a CRO are supplied with to ___________ observe the waveform of signal.

1. Sinusoidal wave
2. Cosine wave
3. Sawtooth wave
4. None of the above

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20. The input resistance of a VTVM is about ___________.

1. 1000 O
2. 10 kO
3. 20 kO
4. 10 MO

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