Q. Why are relays used for driving the motors?

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Q. Why are ULN2803 normally used between the micro controllers and the relays?

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Q. Why are opto isolators normally used between the micro controllers and the ULN2803?

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Q. Which of the following is a type of a electromagnetic relay?

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Q. Reed switches show connectivity whenever they are in the presence of an electrical field?

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Q. Which of the following is an application of stepper motors?

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Q. What are normal 4 step sequence of a stepper motor if we start to move in clockwise direction with 0110 value?

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Q. What is the meaning of a step angle?

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Q. For a normal 4 step sequence, what are number of teeth required to accomplish a 2 degree step angle?

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Q. Ounch-inch is a unit of a torque.

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Q. Why do we make the connection of the SCLK for communicating serially between two devices?

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Q. What is the function of the CE pin in SPI?

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Q. Which of the following is correct?

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Q. If CPHA= 0 and CPOL=1, then which of the following is true?

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Q. In SPI write, LSB goes first?

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Q. In AVR, which of the following registers are used for SPI?

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Q. How do we set the SPI, to operate in the master mode 1?

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Q. SPI can act as a half duplex transmission?

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Q. Which frequency is not recommended for SPI clock?

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Q. To select the value of the clock to be fosc/16, what are the appropriate values?

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