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
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
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
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
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
The use of negative feedback ________________?
(A) reduces the voltage gain of an Op-amp
(B) makes the Op-amp oscillate
(C) makes linear operation possible
(D) answers (A) and (B)
A certain OP-amp has bias currents of 50 µA. The input offset current is_________________?
(A) 700 nA
(B) 99.3 µA
(C) 49.7 µA
(D) none of these
If the feedback resistor in Q15 (above question) is open, the voltage gain ____________?
(A) increases
(B) decreases
(C) is not affected
(D) depends on Ri
A voltage follower _____________?
(A) has a voltage gain of 1
(B) is noninverting
(C) has no feedback resistor
(D) has all of these