Hardware MCQ - 1

1. Which among the below not correct for I2C?

A. I2C is a half-duplex interface

B. I2C is Asynchronous communication interface

C. I2C is open-drain interface

D. I2C follow Wire-AND communication

Ans: B 

I2C is a synchronous interface. Data is transmitted in sync with the clock

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2. What is the current 'I' through the circuit?

A. 0.7 mA

B. 3.3 mA

C. 11.8 mA

D. 15 mA

Ans: C

I = (3.3-0.7)/220 = 11.8 mA

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3. Which among the below is a plug-in type?

A. Processor

B. RAM

C. EEPROM

D. Ethernet PHY

Ans: B

RAM has plug-in options

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4. A zener diode is used in a design having a breakdown voltage of 5.1V. It has a maximum power dissipation specification of 510 mW. What is the maximum current the diode can handle in the design?

A. 50 mA

B. 100 mA

C. 1000 mA

D. 5.1 mA

Ans: B

P = V*I => I = P/V => I = 510m/5.1 => I = 100 mA

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5. Which of the following are not commonly used peripherals of a micro controller?

A. RAM

B. I2C

C. Ethernet

D. UART

Ans: A

RAM is internal to the microcontroller and is only interfaced external processor. However, it is not common to see an external RAM interfaced to microcontroller through External Bus Interface

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