MCQ IN COAL INDIA (PART-2)
*Which diagram explains the limit of explosibility of CH4? (1)coward (2)le chetelier (3)Graham's (4)palvalov *The delay between the ignition and the application of the heat source termed as (1)lag on ignition (2) incubation period (3)saturation period (4)thermal conductivity *What is the use of pitot tube? (1)to measure static pressure (2)to measure sound wave (3)to measure air velocity (4)to measure air temperature. *Name the instrument which is used to measure the atmospheric pressure? (1)barometer (2) hygrometer (3)kata thermometer (4)methanometer *What type of measurement is done with velometer? (1) pressure drop between any point intake airways (2) air velocity (3)mine air resistant (4)air temperature *Methane drainage was first tried in a colliery? (1)Ruhr coalfield of Germany (2)amlabed colliery of India (3)Santa Lucia mine of Spain (4)Lorraine coal field of France. *Firedamp is largely made up of (1)CO2 (2)CO (3)CH4 (4)N2 *What is the relation between size of coal and total methane gas content emitted at face? (1)directly proportional (2)inversely proportional (3)in Gp series (4)in Ap series। *Which of the following means is adopted to break the methane layering? (1) in creased air velocity (2)methane probe (3)Venturi blower (4) water spraying *Which of the following test is better to carry out before cap test? (1) ignition test (2) accumulation test (3) loop test (4) sensitivity test.
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