B:-Rotary drilling

C:-Air rotary drilling
D:-Down the hole drilling
Correct Answer:- Option-B

Question31:-Which of the following statements are true regarding performance of
centrifugal pumps

i. The capacity of the pump varies directly as the speed

ii. The capacity of pump varies directly as the diameter

iii. The head varies directly as the square of the speed

iv. The head varies directly as the cube of the diameter

B:-All of the above

C:-i, ii and iii

D:-none of the above
Correct Answer:- Option-C

Question32:-The filter used in Drip irrigation systems to remove suspended
substances with specific gravity greater than 1.2 is

A:-Media filter
B:-Screen filter
C:-Disc filter
D:-Hydro cyclone filter
Correct Answer:- Option-D
Question33:-In a centrifugal pump, the volute casing helps to convert
A:-Pressure head to velocity head
B:-Gravity head to velocity head
C:-Gravity head to pressure head
D:-Velocity head to pressure head
Correct Answer:- Option-D
Question34:-The accessory used to relieve pressure in the tile drain line is
A:-Junction box
B:-French drains
C:-Relief wells and Breathers
D:-Blind inlets
Correct Answer:- Option-C

Question35:-In case of grain, the ratio of the diameter of the largest inscribing
circle to the diameter of the smallest circumscribing circle is known as

A:-Shape factor