1.A ball bearing operating at a load F has 8000 hours of life. The life of the

bearing, in hours, when the load is doubled to 2F is

a) 8000

b) 6000

c) 4000

d) 1000

2. Environment friendly refrigerant R134 is used in the new generation domestic refrigerators. Its

chemical formula is

a) CHClF2

b) C2Cl3F3

c) C2Cl2F4

d) C2H2F4

3. The number of degrees of freedom of a planar linkage with 8 links and 9 simple revolute joints is

a) 1

b) 2

c) 3

bearing, in hours, when the load is doubled to 2F is

a) 8000

b) 6000

c) 4000

d) 1000

2. Environment friendly refrigerant R134 is used in the new generation domestic refrigerators. Its

chemical formula is

a) CHClF2

b) C2Cl3F3

c) C2Cl2F4

d) C2H2F4

3. The number of degrees of freedom of a planar linkage with 8 links and 9 simple revolute joints is

a) 1

b) 2

c) 3