831. A certain inverting amplifier has a closed-loop voltage gain of 25. The Op-amp has an open-loop voltage gain of 100,000. If an Op-amp with an open-loop voltage gain of 200,000 is substituted in the arrangement, the closed-loop gain________________?
A. doubles
B. drops to 12.5
C. remains at 25
D. increases slightly

832. If the negative potential on the control grid of CRT is increased, the intensity of spot _____________?
A. Is increased
B. Is decreased
C. Remains the same
D. None of the above

833. To send 10% of the main current through a moving coil galvanometer of resistance 99 O the shunt required is______________?
A. 11 O
B. 9 O
C. 100 O
D. 9 O

834. An ideal ammeter has ______________ resistance?
A. Low
B. Infinite
C. Zero
D. High

835. The horizontal plates of a CRO are supplied with _____________ to observe the waveform of signal?
A. Sinusoidal wave
B. Cosine wave
C. Sawtooth wave
D. None of the above

836. If 2% of the main current is to be passed through a galvanometer of resistance G, then resistance of the shunt required is ________________?
A. G/50
B. G/49
C. 49 G
D. 50 G

837. The resistance of an ideal voltmeter is ______________?
A. Low
B. Infinite
C. Zero
D. High

838. Which of the following is likely to have the largest resistance ?
A. Voltmeter of range 10 V
B. Moving coil galvanometer
C. Ammeter of range 1 A
D. A copper wire of length 1 m and diameter 3 mm

839. 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________________?
A. nG
B. G/n
C. G/(n-1)
D. (n-1)G

840. A CRO is used to measure _________________?
A. Voltage
B. Frequency
C. Phase
D. All of above

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