Search
One stage of a cascade impactor designed to operate at 1.0 ft/min at standard conditions has a cutoff diameter of 5 um. What will be the cutoff diameter for this stage if it is operated at 300°F, but flow is measured at 1.0 ft/min after the gas has cooled to standard conditions?
6. A 72-ohm coil of wire is connected in series with an adjustable resistor(rheostat) whole resistance can be varied from 0 to 99 ohms. If the line is 115 volts, calculate (a) the range through which the coil current can be varied, (b) the rheostat resistance when the power taken by the coil is 90 watts.
The answer should be:0.72 to 1.6 amp
7. Using the given data of Prob. 6, calculate the power taken by the coil when the voltage drops across rheostat and coil are equal.
The answer should be: 45.8 watts
A total of 10 rectangular aluminum fins (k = 203 W/m·K) are placed on the outside flat surface of an electronic device. Each fin is 100 mm wide, 20 mm high and 4 mm thick. The fins are located parallel to each other at a center-to-center distance of 8 mm. The temperature at the outside surface of the electronic device is 60°C. The air is at 20°C, and the heat transfer coefficient is 100 W/m2 ·K. Determine (a) the rate of heat loss from the electronic device to the surrounding air and (b) the fin effectiveness.
Design and Implement the following logic functions using Verilog. And must be implemented using all three modeling techniques (Gate level modeling, Dataflow modeling, and Behavioral modeling)
i. Unclocked S-R latch.
ii. Clocked S-R latch.
Distinguish between renewable and non-renewable source of energy.
Can a full detailed description be given on how a aluminium frying pan is made through casting?
QUESTION 3 [ 17 Marks]
(a) Give the different types of loading and supports on a beam.
[7]
(b) State the assumptions made in the theory of pure bending.
[3]
(c) In a civil engineering construction site, a rectangular support beam 100 mm wide and
250 mm deep is exposed to a maximum shear force of 50kN. You are required to
calculate:
(i)
Average shear stress,
(ii)
Maximum shear stress,
(iii)
Shear stress at 25 mm above the neutral axis
QUESTION 2 [14 Marks]
In a metal workshop a technician is tasked with making calculations on metal strength
properties. The technician is given two rectangular plates, one of steel and the other of brass
each 40 mm wide and 10 mm deep and these are placed together to form a beam 40 mm wide
and 20 mm deep, on two supports 1 m apart, the brass plate being on top of the steel plate. You
are required to calculate the maximum load which can be applied at the centre of the beam
given that the plates are either
(a) Separate and bend independently,
[6]
(b) Firmly secured throughout their length.
[8]
Given: The maximum allowable stress in steel= 112.5 N/mm2
and in brass = 75 N/mm2
.
Take Es = 2 X 105 N/mm2
and Eb = 8 X 104 N/mm2.
