CIE-II - MCA - 2024-25_Sem-I

Which pins of the 8051 are set aside for serial communication?

• 16 and 17

• 20 and 40

• 18 and 19

• 10 and 11

What is the function of the SCON register in 8051 microcontroller?

• to control SBUF and SMOD registers

• to program the start bit, stop bit, and data bits of framing

• to control SMOD registers

• none of the mentioned

What is the need of a ULN2803 in driving a relay in 8051 microcontroller?

• for switching a motor

• for increasing the current

• for increasing the power

• for switching the voltage

What is the reason for a gap between the transmitter and receiver in an optoisolator when interfaced to 8051 microcontroller?

• to allow conduction of current

• to increase the voltage and current levels

• to prevent the electrical current surge from reaching the system

• none of the mentioned

How to interface LM35 to 8051 microcontroller?

• directly to any IO pin of 8051

• to analog channel of ADC then to 8051

• to RxD pin of 8051

• to TxD pin of 8051

A stepper motor with a step angle of 15 degrees has _____steps per revolution.

• 72

• 27

• 24

• 16

Which of the following interface is used for waveform generation using the 8051 microcontrollers?

• ADC

• DAC

• ACD

• CAD

8 input DAC in 8051 microcontroller has

• 8 discrete voltage levels

• 64 discrete voltage levels

• 124 discrete voltage levels

• 256 discrete voltage levels

When is TI flag in SCON register raised in 8051 microcontroller?

• During the transfer of STOP bit

• During the transfer of START bit

• Upon RESET

• On an Interrupt

What are the components of an optoisolator interfaced with 8051 microcontroller?

• It has an LED transmitter and a photosensor receiver, separated from each other by a gap

• It has an LED transmitter and a transistor.

• It has a photosensor and a transistor.

• It has an LED transmitter and a photo transistor.