Engineering Answers

All about programmable peripheral interface (interface to A/D and D/A converter).

Consider a memory of 8 words per block. If 2 clock cycle are required to transfer address

from CPU to main memory and 6 clock cycle to access the 1st word and 3 clock cycle each for

consecutive words and 2 clock cycle for transferring the word from memory to cache. Then

calculate the total clock cycle required to transfer the block with interleaving and without

interleaving if the number of module is four.

A 100 KVA. 4600 V three phase wye-connected alternator has an

armature resistance of 2 Ω per phase and synchronous armature

reactance, Xs’ of 20 Ω per phase. Find the full load generated voltage

per phase at: a)Unity power factor b) A power factor of 0.75 lagging ii)

Repeat part i) to determine the generated voltage per phase at full load

with: a) A leading load of 0.75 power factor b) A leading load of 0.4

power factor.

A mixture of 60%methane and 40%propane by volume is compressed from 40°C, 4bar to 12 bar. Find the final temprature of the mixture, work required per unit mass, and the entropy change for each gas assuming ideal gas behaviour with constant specific heats. take Cp for methane as 35.72KJ/kgK and Cp for propane as 74.56KJ/kgK

A tank is situated at top of a house. RL of ground was kept as 200 m while the RL of the

terrace was measured to be 206.5 m. The RL of top of tank was found to be 208 m. An orifice

is placed at the bottom of the tank (Cd = 0.65) having diameter of 40 mm. A pipe was fit to

the orifice having diameter of 40 mm and diameter of the pipe was suddenly increased to 100

mm. Bend of 90o was provided and a gate valve is provided to control the flow. Just before

the tap a bend of 90o was again provided and a sudden contraction was provided and pipe

diameter was reduced to 20 mm. Calculate the discharge coming out from the tap if the total

length of pipe is 120 m (10 m 40 mm pipe, 90 m 100 mm pipe and 20 m 20 mm pipe) and

pipe is made up of steel with f = 0.015 if

A parallel resonance circuit has a resistance of and half-power frequencies of 86 kHz and 90 kHz. Determine, (a) the capacitance, (b) the resonant frequency, (c) the inductance, (d) the bandwidth and (e) the quality factor.

In a crane, the chain sprocket is driven by a motor on the spindle of which

is keyed a pinion of 14 teeth. This meshes with a gear of 68 teeth keyed

to the same spindle as a pinion of 12 teeth. The last gear meshes with a

gear of 50 teeth keyed to the same spindle as a gear of 25 teeth, and

the latter gear meshes with a gear of 54 teeth keyed to the chain sprocket

spindle. Chain sprocket is 16 ½ 𝑖𝑛. in diameter. Sketch the arrangement

and find the number of revolutions per minute of the motor when 20 ft of

chain are wound on the drum per minute.

In a brick-making machine is found this train of gears. A motor is carrying

pulley E, which is 6 in.in diameter, drives the machine. The wide-faced

roller F, 12 in. in diameter, drives a conveyor belt. If the motor runs at

1200 rpm, what is the speed of the conveyor belt in feet per minute?

In a broaching machine, the shaft A carries a pulley 24 in. in diameter which is driven by a belt from a 12-in. pulley on the countershaft overhead, the latter turning 150 rpm. The gears 2 and 4 have 12 teeth each, and 3 and 5 have 60 teeth. Gear 5 is fast to 6, which has 10 teeth and a circular pitch of 1.047 in. and which engages with rack 7 to which is attached the broach. Find the speed with which the broach is drawn through the work in inches per minute.

A man borrows Php100,000 at a rate of 6% compounded continuously for 5 years. How much must he pay annually if money is compounded continuously?