56. The switching time of an opto-isolator ________ with increased current, while for many devices it is exactly the reverse.
(a) increases
(b) decreases
(c) remains the same
(d) None of the above
57. In a programmable unijunction transistor (PUT), the ________ can be controlled through a couple of resistors and the supply voltage.
(a) interbase resistance RBB
(b) intrinsic stand-off ratio
(c) emitter firing potential VP
(d) All of the above
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