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1221.

The economically smallest size of gobar gas plant is:

A.	30 cubic ft	B.	50 cubic ft
C.	60 cubic ft	D.	70 cubic ft

1222.

The capacity of biogas plant varies from:

A.	2.0-2.75 m3	B.	10-50 m3
C.	2-150 m3	D.	5-200 m3

1223.

The capacity of smallest biogas plant is about:

A.	1 m3	B.	2 m3
C.	6 m3	D.	12 m3

1224.

The percentage of nitrogen in gobar gas manure is:

A.	1.50%	B.	2.00%
C.	4.50%	D.	8%

1225.

Biogas is used for:

A.	Cooking food	B.	Operating engine
C.	Burning gas stove	D.	All are correct

1226.

A quantity of gobar gas required to cook one-person meal is:

A.	3 kg	B.	5 kg
C.	8 kg	D.	10 kg

1227.

The production of gas from one kilogram of wet dung in biogas plant is:

A.	0.037 m3	B.	0.085 m3
C.	1.0 m3	D.	1.5 m3

1228.

The pH value of sturry for better gas production should be between:

A.	3?5	B.	5?6
C.	7?8	D.	8?9

1229.

Calorific value of biogas is:

A.	450 Kcal/m3	B.	1000 Kcal/m3
C.	3000 Kcal/m3	D.	4500 Kcal/m3

1230.

Biogas is obtained by the anaerobic fermentation of:

A.	Animal dung	B.	Plant waste
C.	Animal waste	D.	All are correct