Hexaware Placement: Sample Questions 3 - 4 of 6

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Question 3

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What is meant by Superconductivity?

Explanation

is the ability of certain materials to conduct electric current with practically zero resistance . This produces interesting and potentially useful effects. For a material to behave as a superconductor, low temperatures are required. Superconductivity was first observed in 1911 by H. K. Ones, a Dutch physicist. It is an idea like if we pump some electricity into a closed superconducting loop, that loop would hold its charge indefinitely. The electrons will simply go round and round and round, never stopping, and never losing any of their energy to resistance, magnetic interference, or even heat loss.

Question 4

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What is ALE?

Explanation

ALE (Address Latch Enable) is a control signal of 8085 MPU. 8085 is a 8-bit microprocessor which have 16-bit address bus among them lower 8-bit are multiplexed. So while MPU executes read or write operation it needs to demultiplex. ALE control signal used to demultiplex the lower order address and data bus. The address bus will be enabled during the 1st clock cycle as the ALE pin goes high i.e.. logic ‘1’ during the first half cycle. During 2nd and 3rd clock cycles it goes low i.e.. logic ‘0’ indicating the address & data bus (AD0-AD7) is for data. Hence it disables the address & data bus during the 2nd and 3rd clock cycles.

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