EOM 2 paper 15

71,By varying the pitch of the blades the pressure generated by axial flow fan is?

remains same,

decreases,

increases,

increases 8 times,

72,The water guage of a axial flow fan can be increased by?,

increasing speed of rotation,

changing the pitch of blades,

installing 2 or more stages,

enlarging the evasee of the fan,

73,The manometric efficiency of axial flow fan is?,

10 to 20 %,

70 to 85 %,

20 to 30 %,

40 to 50 %,

74,The ovarall efficiency of axial flow fan is?,

10 to 20 %,

70 to 85 %,

20 to 30 %,

40 to 50 %,

75,Modern flame safety lamps can withstand an air velocity of?,

5 m/s,

10 m/s,

15 m/s

20 m/s,

Ans: 1, 3, 3, 2, 3