McqMate
Chapters
101. |
In hydraulic head, NPSH is used for the analysis of |
A. | Adiabatic expansion |
B. | Priming |
C. | Wear |
D. | Cavitation View Answer |
Answer» D. Cavitation View Answer |
102. |
NPSH is the difference between |
A. | Suction pressure and vapour pressure |
B. | Vapour pressure and suction pressure |
C. | Suction pressure and heat |
D. | Shaft and head View Answer |
Answer» A. Suction pressure and vapour pressure |
103. |
What can NPSH be used to determine |
A. | Friction characteristics |
B. | Pipe diameter |
C. | Cavitation |
D. | Thermal expansion View Answer |
Answer» C. Cavitation |
104. |
The measure of how close the fluid is to the given point is called |
A. | Flashing |
B. | Darcy’s factor |
C. | Transfer temperature |
D. | Heizenberg’s factor View Answer |
Answer» A. Flashing |
105. |
NPSH is relevant |
A. | Outside the pumps |
B. | Inside the pumps |
C. | Away from the pumps |
D. | Series and parallel with the pumps View Answer |
Answer» A. Outside the pumps |
106. |
With the increase in cavitation, the drag coefficient of the impeller |
A. | Increases |
B. | Decreases |
C. | Same |
D. | Independent View Answer |
Answer» A. Increases |
107. |
What is positive suction head? |
A. | Draft tube is above |
B. | Pump pressure is above |
C. | Liquid level is above |
D. | Turbine head is above View Answer |
Answer» C. Liquid level is above |
108. |
NPSHr is determined by using |
A. | Pump pressure |
B. | PumpLinx |
C. | Heat transfer |
D. | Chemical energy View Answer |
Answer» B. PumpLinx |
109. |
If we use two lower capacity pumps in parallel, cavitation |
A. | Increases |
B. | Decreases |
C. | Same |
D. | Independent View Answer |
Answer» B. Decreases |
110. |
The characteristic curves of a centrifugal pump, plots required by the pump. |
A. | Velocity |
B. | Pressure |
C. | NPSH |
D. | Velocity and pressure View Answer |
Answer» C. NPSH |
111. |
Which among the following is not a characteristic curve for centrifugal pump? |
A. | Transfer speed vs Transfer pressure |
B. | Head vs Flow rate |
C. | Power input vs pump efficiency |
D. | Specific speed vs pump efficiency View Answer |
Answer» A. Transfer speed vs Transfer pressure |
112. |
The consequence of Newtons second law is |
A. | Conservation of angular momentum |
B. | Conservation of mass |
C. | Conservation of potential energy |
D. | Conservation of kinetic energy View Answer |
Answer» A. Conservation of angular momentum |
113. |
Which of the following is taken into account during a characteristic curve? |
A. | Flow rate |
B. | Cavitation |
C. | Tolerances |
D. | Casing View Answer |
Answer» A. Flow rate |
114. |
As the specific speed increases, the slope of HQ curve |
A. | Decreases |
B. | Increases |
C. | Independent |
D. | Remains the same View Answer |
Answer» C. Independent |
115. |
The primary selection tool is called as |
A. | Pump curve |
B. | Speed curve |
C. | Power curve |
D. | Fluid curve View Answer |
Answer» A. Pump curve |
116. |
Voids are created due to |
A. | Reaction ratio |
B. | Pressure ratio |
C. | Liquid free layers |
D. | Volumetric layers View Answer |
Answer» C. Liquid free layers |
117. |
Cavitation usually occurs due to the changes in |
A. | Pressure |
B. | Temperature |
C. | Volume |
D. | Heat View Answer |
Answer» A. Pressure |
118. |
Degree of reactions are most commonly used in |
A. | Turbomachinery |
B. | Pressure drag |
C. | Aerodynamics |
D. | Automobiles View Answer |
Answer» A. Turbomachinery |
119. |
At high pressure, the voids can generate |
A. | Drag force |
B. | Mass density |
C. | Shock waves |
D. | Flow speed View Answer |
Answer» C. Shock waves |
120. |
Voids that implode near metal surface develops a |
A. | Drag force |
B. | Cyclic stress |
C. | Shock waves |
D. | Flow speed View Answer |
Answer» B. Cyclic stress |
121. |
Internal cavitation occurs due to |
A. | Drag force |
B. | Cyclic stress |
C. | Shock waves |
D. | Flow speed View Answer |
Answer» C. Shock waves |
122. |
The velocities of the blade angles can be found out using |
A. | Mach number |
B. | Froude’s number |
C. | Velocity triangles |
D. | Reynolds number View Answer |
Answer» C. Velocity triangles |
123. |
Hydrodynamic cavitation is due to the process of |
A. | Vaporisation |
B. | Sedimentation |
C. | Filtration |
D. | Excavation View Answer |
Answer» A. Vaporisation |
124. |
The process of bubble generation leads to |
A. | High temperatures |
B. | High pressures |
C. | High energy densities |
D. | High volumetric ratio View Answer |
Answer» C. High energy densities |
125. |
Reciprocating pump is a |
A. | Negative displacement pump |
B. | Positive displacement pump |
C. | Diaphragm pump |
D. | Emulsion pump |
Answer» B. Positive displacement pump |
126. |
What happens to the reciprocating pump when left untouched? |
A. | Efficiency decreases |
B. | Wear and tear |
C. | Surface expansion |
D. | Pressure change |
Answer» C. Surface expansion |
127. |
Reciprocating pumps operate by drawing into the chamber |
A. | Liquid |
B. | Pressure |
C. | Heat |
D. | Electricity |
Answer» A. Liquid |
128. |
The cylinder of reciprocating cylinder is made up of |
A. | Cast iron |
B. | Wrought iron |
C. | Aluminium |
D. | Copper View Answer |
Answer» A. Cast iron |
129. |
The higher discharge valve line holds the discharge valve |
A. | Open |
B. | Closed |
C. | Stop functioning |
D. | Automatic View Answer |
Answer» B. Closed |
130. |
Reciprocating pumps are also called as |
A. | Force pumps |
B. | Mass Pumps |
C. | Heat pumps |
D. | Speed pumps View Answer |
Answer» A. Force pumps |
131. |
Reciprocating pumps are classified according to |
A. | Drag force |
B. | Number of cylinders |
C. | Shock waves |
D. | Flow speed View Answer |
Answer» B. Number of cylinders |
132. |
Simple hand operating pump is also called as |
A. | Froth pump |
B. | Bicycle pump |
C. | Multistage pumps |
D. | Centrifugal pumps View Answer |
Answer» B. Bicycle pump |
133. |
Power operated pump in which only one side engages the fluid displacement is called |
A. | Froth pump |
B. | Single acting |
C. | Double acting |
D. | Bicycle pump View Answer |
Answer» B. Single acting |
134. |
Operation of reciprocating motion is done by a source |
A. | Power |
B. | Energy |
C. | Momentum |
D. | Inertia View Answer |
Answer» A. Power |
135. |
An up and down back and forth relative linear motion is called |
A. | Reciprocation |
B. | Rotation |
C. | Filtration |
D. | Excavation View Answer |
Answer» A. Reciprocation |
136. |
Power operated pump in which only both sides engage the fluid displacement is called |
A. | Froth pump |
B. | Single acting |
C. | Double acting |
D. | Bicycle pump View Answer |
Answer» C. Double acting |
137. |
The two opposite motion that comprise a single reciprocation is called |
A. | Turbocharger |
B. | Stokes |
C. | Fluid motion |
D. | Auto motion View Answer |
Answer» A. Turbocharger |
138. |
Reciprocating pumps has efficiency compared to centrifugal pumps |
A. | Higher |
B. | Lower |
C. | Equal |
D. | Exponential View Answer |
Answer» B. Lower |
139. |
Reciprocating pumps works on the principle of |
A. | Drag force |
B. | Liquid flow push |
C. | Shock waves |
D. | Flow speed View Answer |
Answer» B. Liquid flow push |
140. |
Reciprocating pump is a type of |
A. | Positive displacement pump |
B. | Bicycle pump |
C. | Multistage pumps |
D. | Centrifugal pumps View Answer |
Answer» A. Positive displacement pump |
141. |
During the suction stroke the moves left thus creating vacuum in the Cylinder. |
A. | Piston |
B. | Cylinder |
C. | Valve |
D. | Pump View Answer |
Answer» A. Piston |
142. |
When both the sources are effective it is called as |
A. | Double acting pump |
B. | Single acting pump |
C. | Triple acting pump |
D. | Normal pump View Answer |
Answer» A. Double acting pump |
143. |
A repetitive variation about the central value of equilibrium is called |
A. | Reciprocation |
B. | Oscillation |
C. | Filtration |
D. | Excavation View Answer |
Answer» B. Oscillation |
144. |
A linear wheel turning motion is called as a |
A. | Reciprocation |
B. | Rotation |
C. | Oscillation |
D. | Bicycle pump View Answer |
Answer» B. Rotation |
145. |
A reciprocating pump that has 1200 crank is |
A. | Froth pump |
B. | Single acting |
C. | Double acting |
D. | Triple acting View Answer |
Answer» D. Triple acting View Answer |
146. |
In a positive displacement pump, what gets displaced? |
A. | Fluid |
B. | Volume |
C. | Pressure |
D. | Temperature View Answer |
Answer» B. Volume |
147. |
What happens to the reciprocating pump when left untouched? |
A. | Efficiency decreases |
B. | Wear and tear |
C. | Surface expansion |
D. | Pressure change View Answer |
Answer» C. Surface expansion |
148. |
Positive displacement pumps are capable of developing pressures, in suction pressure. |
A. | High, low |
B. | Low, high |
C. | High, high |
D. | Low, low View Answer |
Answer» A. High, low |
149. |
When is a reciprocating pump used? |
A. | When quantity of liquid is small |
B. | When quantity of liquid is large |
C. | To pump high pressure |
D. | To pump low pressure View Answer |
Answer» A. When quantity of liquid is small |
150. |
Positive displacement pumps are also called as_ |
A. | Constant pressure pump |
B. | Pressure drag pumps |
C. | Constant volume pumps |
D. | Constant head pumps View Answer |
Answer» C. Constant volume pumps |
151. |
In centrifugal pumps, their capacity is affected due to |
A. | Drag force |
B. | Cyclic stress |
C. | Shock waves |
D. | Pressure View Answer |
Answer» D. Pressure View Answer |
152. |
A quantity of fluid that leaks from a higher pressure discharge to a lower pressure discharge is called |
A. | Slip |
B. | Heat |
C. | Friction |
D. | Enthalpy View Answer |
Answer» A. Slip |
153. |
Positive displacement pumps regulate the flow by varying its |
A. | Drag force |
B. | Cyclic stress |
C. | Shock waves |
D. | Flow speed View Answer |
Answer» D. Flow speed View Answer |
154. |
Simplest example of single acting reciprocating pump is |
A. | Mineral ores |
B. | Whirl wheels |
C. | Bicycle tires |
D. | Syringe View Answer |
Answer» D. Syringe View Answer |
155. |
Rotary pumps do not function well under |
A. | High Vaporisation |
B. | High Sedimentation |
C. | High viscosity |
D. | Excavation View Answer |
Answer» C. High viscosity |
156. |
The parameter that disturbs the working of the rotary pump is_ |
A. | High Vaporisation |
B. | High Sedimentation |
C. | Low flow rate |
D. | Excavation View Answer |
Answer» C. Low flow rate |
157. |
Rotary pumps are commonly used to circulate_ |
A. | Lube oils |
B. | Petroleum |
C. | Diesel |
D. | Water View Answer |
Answer» A. Lube oils |
158. |
Capacity of a rotary pump is defined as |
A. | Total liquid displaced |
B. | Overall performance of pump |
C. | Maximum fluid flow |
D. | Minimum fluid flow View Answer |
Answer» A. Total liquid displaced |
159. |
What type of flow does the reciprocating pump have? |
A. | Uniform |
B. | Continuous |
C. | Pulsating |
D. | Non-uniform View Answer |
Answer» B. Continuous |
160. |
What is the full form of PD? |
A. | Positive displacement |
B. | Pump displacement |
C. | Plunger displacement |
D. | Plunger direct View Answer |
Answer» A. Positive displacement |
161. |
Why can’t rotary pumps non-lubricate water? |
A. | Because it has lesser viscosity |
B. | Because it contains abrasive particles |
C. | Multistage pumps are difficult to operate |
D. | Draft tube is thin View Answer |
Answer» B. Because it contains abrasive particles |
162. |
The maximum speed of reciprocating pump is |
A. | 20m/min |
B. | 30m/min |
C. | 40m/min |
D. | 50m/min View Answer |
Answer» B. 30m/min |
163. |
The pump that uses a relatively smaller amount of liquid is called |
A. | Froth pump |
B. | Reciprocating pump |
C. | Double acting |
D. | Bicycle pump View Answer |
Answer» B. Reciprocating pump |
164. |
Sliding vanes in pumps are held by |
A. | Draft pins |
B. | Whirl wheels |
C. | Springs |
D. | Nails View Answer |
Answer» C. Springs |
165. |
Air vessel accumulates excess quantity of |
A. | Vapor |
B. | Water |
C. | Heat |
D. | Pressure View Answer |
Answer» B. Water |
166. |
In which pump is the liquid in contact with both the sides of the plunger |
A. | Froth pump |
B. | Single acting |
C. | Double acting |
D. | Bicycle pump View Answer |
Answer» C. Double acting |
167. |
When a cylinder has inlet and outlet ports at each end, then it is called as |
A. | Double acting |
B. | Air lift pumps |
C. | Reciprocating pumps |
D. | Centrifugal pumps View Answer |
Answer» A. Double acting |
168. |
Turbomachines work under |
A. | Newtons first law |
B. | Newtons second law |
C. | Newtons third law |
D. | Kepler’s law View Answer |
Answer» B. Newtons second law |
169. |
The main function of nozzle is to |
A. | Varying temperatures |
B. | Pressure variations |
C. | Load variations |
D. | Heat variations View Answer |
Answer» B. Pressure variations |
170. |
When the piston moves forward, liquid is drawn |
A. | Into the cylinder |
B. | Away from the cylinder |
C. | Into the draft tube |
D. | Away from the draft tube View Answer |
Answer» A. Into the cylinder |
171. |
In a reciprocating pump, with the change in discharge pressure, |
A. | The Volume delivered increases |
B. | The volume delivered decreases |
C. | Volume delivered remains the same |
D. | Volume delivered is independent View Answer |
Answer» C. Volume delivered remains the same |
172. |
The amount of fluid that leaks internally is called |
A. | Head race |
B. | Slip |
C. | Tail race |
D. | Internal friction View Answer |
Answer» B. Slip |
173. |
For a good condition, slip should be_ |
A. | Below 1 percent |
B. | 1 to 2 percent |
C. | 3 to 4 percent |
D. | Above 5 percent View Answer |
Answer» A. Below 1 percent |
174. |
If the slip is above 5 percent, the pumps needs to be |
A. | Dragged |
B. | Overhauled |
C. | Retracted |
D. | Intermittent View Answer |
Answer» B. Overhauled |
175. |
Slip in a pump depends on which of following parameters? |
A. | Wear |
B. | Pressure |
C. | Temperature |
D. | Heat View Answer |
Answer» A. Wear |
176. |
Internal breakage in a pump mainly takes place when |
A. | Discharge pressure is increased |
B. | Temperature is increased |
C. | Heat leads to expansion |
D. | Corrosion takes place View Answer |
Answer» A. Discharge pressure is increased |
177. |
The output that we get after an internal breakage can be classed as |
A. | An increase |
B. | A decrease |
C. | Constant |
D. | An independent variable View Answer |
Answer» C. Constant |
178. |
When the hydraulic fluid forms on only one side of the piston, it is called |
A. | Single acting pump |
B. | Double acting pump |
C. | Froth pump |
D. | Draft tube View Answer |
Answer» A. Single acting pump |
179. |
A pump with two steams and two water cylinders is called |
A. | Single acting pump |
B. | Double acting pump |
C. | Froth pump |
D. | Duplex pump View Answer |
Answer» D. Duplex pump View Answer |
180. |
When an external force is not available in a pump, we use a |
A. | Hydraulic cylinder |
B. | Slip gauge |
C. | Tail race |
D. | Heater View Answer |
Answer» A. Hydraulic cylinder |
181. |
Reciprocating pumps give a flow |
A. | Uniform |
B. | Non- uniform |
C. | Pulsating |
D. | Sinusoidal View Answer |
Answer» C. Pulsating |
182. |
Suction stroke becomes difficult to pump |
A. | High temperature fluids |
B. | Viscous fluids |
C. | Fluids with abrasives |
D. | High velocity fluids View Answer |
Answer» B. Viscous fluids |
183. |
Piston pumps are very |
A. | Expensive |
B. | Cheap |
C. | Reasonable |
D. | Intricate View Answer |
Answer» A. Expensive |
184. |
What is the full form of DAC? |
A. | Digital Acting pumps |
B. | Double acting pumps |
C. | Data acting pumps |
D. | Draft tube pumps View Answer |
Answer» B. Double acting pumps |
185. |
Which among the following is not a multi-cylinder pump? |
A. | Double acting simplex |
B. | Single acting duplex |
C. | Double acting duplex |
D. | Single acting triplex View Answer |
Answer» A. Double acting simplex |
186. |
A pressure vessel is used to hold |
A. | Air |
B. | Gases |
C. | Molecules |
D. | Solids View Answer |
Answer» B. Gases |
187. |
A tank that is used to protect closed water heating systems is called |
A. | Pressure vessel |
B. | Expansion vessel |
C. | Heat vessel |
D. | Auto vessel View Answer |
Answer» B. Expansion vessel |
188. |
How is the construction of the vessel tested? |
A. | Uniform testing |
B. | Continuous testing |
C. | Pulsating test |
D. | Non-destructive testing View Answer |
Answer» D. Non-destructive testing View Answer |
189. |
Where is the excess quantity of water from the pump accumulated? |
A. | Froth tube |
B. | Draft tube |
C. | Air vessels |
D. | Bicycle pump View Answer |
Answer» C. Air vessels |
190. |
What is the shape of a pressure vessel? |
A. | Square |
B. | Spheres |
C. | Cones |
D. | All the shapes View Answer |
Answer» D. All the shapes View Answer |
191. |
Pressure vessel closures are used to |
A. | Avoid breakage |
B. | Avoid leakage |
C. | Retain structures |
D. | Maintain pressure View Answer |
Answer» C. Retain structures |
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