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calculate the total sound pressure level caused by a combination of sounds with the following SPL,s (a) 25db and 39db (b)60db+60db+60db

What is the maximum reading allowed for earth continuity on a white goods appliance?
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A bus is a set of wires connecting computer components. A computer may have several buses, e.g. a system bus, an internal bus, and special purpose local buses. All communication between the various components takes place over one of these buses. For example, data transfer between the CPU and memory normally occurs on the system bus, while movement of data between registers and the ALU takes place on a bus internal to the microprocessor chip. The speed at which data can be transferred is dependent on the number of data lines in the bus and, in the case of synchronous buses, the clock speed of the bus. The transfer rate or bandwidth of a particular system bus can be calculated from the number of cycles required for transfer, the length of the cycle and the number of data lines. Each data line carries 1 bit at a time.

Suppose that a bus has 16 data lines and requires 4 cycles of 250 ns each to transfer data. The bandwidth of this bus would be,
a)1Mb/s b)2 Mb/s c)4 Mb/s d)8Mb/s

A communication channel is of 10kbps bandwidth. The transmission media is fiber optic. We need to
send a window of size 15 packets, where each packet is containing 5000bytes. The total time to
transfer all data from one to another node is:
(a) 50ms
(b) 25ms
(c)75ms
(d)None of these