1181. For pipes that must be broken at intervals for maintenance , the conncector used should be a/an :
A. Union *
B. Tee
C. Reducer
D. Elbow
1182. If more than two branches of pipes are to be connected at the same point , then use a/an:
A. Elbow
B. Union
C. Tee *
D. None of these
1183. The most economical valve for use with large diameter pipes is :
A. Butterfly valve *
B. Globe valve
C. Needle valve
D. None of these
1184. Which of the following factors doesnot contribute to the pressure drop in a pipeline ?
A. Velocity of fluid
B. Size of pipe
C. Lenght of pipe and number of bends
D. None of these
1185. Which of the following factors does not contribute to the pressure drop in a pipeline ?
A. Velocity of fluid
B. Size of pipe
C. Lenght of pipe and number of bends
D. None of these *
1186. Which of the following can be used to creat a flow of gas where no significant compression is required ?
A. Reciprocating compressor
B. Blower *
C. Axial flow compressor
D. Centrifugal Compressor
1187. Erosion and pits formation on the impeller of a centrifugal pump may be due to :
A. Cavitation *
B. Low speed of impeller
C. Its operation with delivery valve closed for considerable time after starting the pump
D. Off centering of pump with motor
1188. Which of the following valves will incur maximum pressure drop for the same discharge of water ?
A. Globe valve
B. Gate valve
C. Needle valve *
D. Butterfly valve
1189. While starting an axial flow pump, its delivery valve should be kept :
A. Open *
B. Closed
C. Either open or closed
D. None of these
1190. Identification of pipelines carrying different liquids and gases is done by _________of the pipe:
A. Diameter
B. Colour *
C. Altitude
D. None of these