题目内容

A Zener diode is designed to operate in the ( ) region of its characteristic curve in the operating condition.

A. forward operating
B. reverse bias
C. reverse breakdown
D. zero voltage

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It is best not to leave unused TTL inputs unconnected () because of noise sensitivity. In a TTL NAND gate, there are several alternative ways to handle unused inputs except ( ).

A. tied-together inputs
B. inputs to Vcc
C. inputs to unused output
D. inputs to ground

The 8421-BCD number for decimal 473 is ( ).

A. 010011010011
B. 101011011001
C. 010001110011
D. 010011110011

The time interval on the leading edge of a pulse between 50% and 50% of the amplitude is the ( ).

A. rise time
B. fall time
C. pulse width
D. period

A quantity having continuous value is ( ).

A. a digital quantity
B. an analog quantity
C. a binary quantity
D. a natural quantity