# Digital Circuits [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 61 - 66 of 271

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## Question 61

Appeared in Year: *2003*

### Question

MCQ▾The circuit shown in figure converts

### Choices

Choice (4) | Response | |
---|---|---|

a. | Gray to Binary code | |

b. | Binary to excess - 3 code | |

c. | BCD to binary code | |

d. | Excess -3 to gray code |

## Question 62

Appeared in Year: *2005*

### Question

MCQ▾The Boolean function implemented in the figure using two input multiplexes is,

### Choices

Choice (4) | Response | |
---|---|---|

a. | ||

b. | ||

c. | ||

d. |

## Question 63

Appeared in Year: *2007*

### Question

MCQ▾The Boolean function Y = AB + CD is to be realized using only 2 - input NAND gates. The minimum number of gates required is

### Choices

Choice (4) | Response | |
---|---|---|

a. | 2 | |

b. | 5 | |

c. | 3 | |

d. | 4 |

## Question 64

Appeared in Year: *2003*

### Question

MCQ▾The minimum number of comparators required to build an 8-bits flash ADC is,

### Choices

Choice (4) | Response | |
---|---|---|

a. | 8 | |

b. | 255 | |

c. | 256 | |

d. | 63 |

## Question 65

Appeared in Year: *2004*

### Question

MCQ▾The minimum number of 2- to -1 multiplexers required to realize a 4- to -1 multiplexers is

### Choices

Choice (4) | Response | |
---|---|---|

a. | 1 | |

b. | 4 | |

c. | 2 | |

d. | 3 |

## Question 66

Appeared in Year: *2005*

### Question

MCQ▾Consider an 8085 microprocessor system. The following program starts at location 0100H.

`LXI SP, OOFF`

`LXI H, 0701`

`MVI A, 20H`

`SUB M`

The content of accumulator when the program counter reaches 0109 H is,

### Choices

Choice (4) | Response | |
---|---|---|

a. | 20 H | |

b. | FF H | |

c. | 02 H | |

d. | 00 H |