Digital Circuits [GATE (Graduate Aptitude Test in Engineering) Electronics & CE (EC)]: Questions 77 - 79 of 326
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Question 77
Appeared in Year: 2007
Question MCQ▾
An 8255 chip is interfaced to an 8085 microprocessor system as an I/O mapped I/O as show in the figure. The address lines and of the 8085 are used by the 8255 chip to decode internally its three ports and the Control register. The address lines to as well as the signal be used for address decoding. The range of addresses for which the 8255 chip would get selected is
Choices
Choice (4) | Response | |
---|---|---|
a. | F8GH - FCH | |
b. | F8H - FFH | |
c. | F8H - FBH | |
d. | F0H - F7H |
Question 78
Appeared in Year: 2004
Question MCQ▾
A digital system is required to amplify a binary-encoded audio signal. The user should be able to control the gain of the amplifier from minimum to a maximum in 100 increments. The minimum number of bits required to encode, in straight binary, is
Choices
Choice (4) | Response | |
---|---|---|
a. | 6 | |
b. | 5 | |
c. | 8 | |
d. | 7 |
Question 79
Appeared in Year: 2011
Question MCQ▾
The output of a 3-stage Johnson (twisted ring) counter is fed to a digital-to analog (D/A) converter as shown in the figure below. Assume all states of the counter to be unset initially. The waveform which represents the D/A converter output is
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. |