Engineering

Boost your preparation with the latest Engineering MCQs with answers and explanations. Our collection covers civil engineering, electrical engineering, mechanical engineering, electronics, software engineering, and other core subjects. These multiple-choice questions are designed for students, competitive exam aspirants, and professionals preparing for NTS, PPSC, FPSC, CSS, PMS, PEC exams, university entry tests, and job interviews. Practice online with updated Engineering MCQs to strengthen concepts, improve technical knowledge, and perform better in exams and recruitment tests.

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3222. Pick out the wrong statement.:

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Carburetted water gas is also called blue gas
Coals are divided in four species according to their carbon content in Seylor’s classification
Carbonisation time in a by-product coke oven is about 16 hours
Gross and net calorific value of a fuel is the same, if it does not contain hydrogen or hydrocarbons
✅ The correct answer is option A.

3226. Presence of free moisture in coal during its high temperature carbonisation

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Reduces the coking time
Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls
Increases the loss of fine coal dust from the ovens when charging
None of these
✅ The correct answer is option B.

3229. Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

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The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
It reduces its calorific value tremendously
It reduces its flame temperature tremendously
There are chances of explosion during preheating
✅ The correct answer is option A.