Engineering Answers

It has been known that a fixed dose of a certain drug results to an

average increase of pulse rate by at least 12 beats per minute with

a standard deviation of 5. A group of 20 patients given the same

dose showed the following increases: 15, 12, 10, 8, 14, 15, 16, 11,

7, 13, 9, 10, 12, 11, 9, 10, 17, 14, 15, 7. Is there proof to show that

this group has a lower average increase of pulse rate than the ones

in general? Use 0.05 level of significance

‘A decoder with an enable input can be used as a DEMUX’. Justify and design a 3:8

decoder using 2:4 decoder so that it can also be used as a 1:8 DEMUX.

Design a 3-bit Even Parity Generator circuit using a Decoder with Active-Low outputs.

Design a 4:2 Priority Encoder such that the order of priority of the decimal inputs is given

as D2> D0> D1> D3, where all Di’s are inputs to the priority encoder.

A wedge belt is required to transmit 18.5kw from an electric motor running at 1455rpm to a uniformly loaded conveyor running at 400rpm. The desired center distance is 1.4m select a suitable belt and determine the diameter of the pulleys

An irreversible first-order homogeneous reaction A ----> P is carried out in a batch reactor. It is

required to produce 500 tons of product in 5000 hours of operation. The following data is

available.

Kat 1630C = 0.8 h-1 ; E = 28.96 kcal/gmol ; ΔHr = -15 kcal/gmol ; CPA= 150 kcal /gmol K

A=    kg / m3

;

The times necessary to fill and drain the reactor are 10 & 15 minutes. Negligible reaction occurs

in 10 minutes required to heat reactor to 1630C. XA= 90% . Compare the size requirements for

adiabatic and isothermal operation.

Consider the circuit shown in Fig. 1. If 𝑉1 = 10V; the BJT has a β = 200 and 𝐼𝑠 = 10 𝑎𝐴 and the

capacitors are short circuits in the frequency range of operation, determine the values of 𝑅1 and 𝑅2, if

the amplifier is to have a gain of 100. What is its’ operating point ? It is given that 𝑅3 = 100 Ω.

You are provided with the BC547 transistor and E24 series of resistors, along with a voltage supply of 10 V. If the transistor can be assumed to have a 𝛽 = 200, design a common-emitter amplifier to the following specifications:

a. The amplifier should be biased in the middle of the active region.

b. A sinusoidal output of amplitude 1 V should be obtained when a sinusoidal input of amplitude 10 mV and frequency 10 kHz, is applied from a source of resistance 5 kΩ. 

https://www.chegg.com/homework-help/questions-and-answers/choose-correct-definition-idiom-use-dictionary-1-get-like-house-fire-good-relationship-b-a-q65726684

A barite composed of 100% BaSO4 is fused with carbon in the form of coke containing 6% ash (which is infusible). The composition of the fusion mass is

BaSO4 11.1%

BaS 72.8

C 13.9

Ash 2.2

_____

100%

Reaction:

BaSO4 + 4C → BaS + 4CO

Find the excess reactant, the percentage of the excess reactant, and the degree of completion of the reaction.