Which fuel is prepared by heating bituminous coal continuously for 15 to 18 hours in closed chamber? March 25, 2021 by admin Question: Which fuel is prepared by heating bituminous coal continuously for 15 to 18 hours in closed chamber? A. charcoal B. anthracite C. coke D. briquette coal Answer» c. coke Note: The above multiple-choice question is for all general and Competitive Exams in India.