85151. Slip of a reciprocating pump is negative, when
85152. Which of the following is not an impulse turbine?
85153. A hydraulic accumulator is a device used to store __________ energy which may be supplied to a machine later on.
85154. The Furneyron turbine is __________ reaction turbine.
85155. The discharge through a turbine is
85156. Which of the following pump is sucessfully used for lifting water to the boilers?
85157. The efficiency of a reaction turbine for a given head __________ with the increase in speed.
85158. In an impulse turbine, the pressure of water both at entering and leaving the vanes, is atmospheric.
85159. Which of the following pump is successfully used for lifting water from deep wells?
85160. The Thomson's turbine is __________ reaction turbine.
85161. Manometric head is the actual head of water against which a centrifugal pump has to work.
85162. The hydraulic efficiency of an impulse turbine is the
85163. The overall efficiency for a Pelton wheel lies between
85164. Which of the following statement is wrong ?
85165. Which of the following statement is correct as regard to water wheels?
85166. Braking jet in an impulse turbine is used
85167. Head developed by a centrifugal pump is
85168. The ratio of the normal force of jet of water on a plate inclined at an angle of 30° as compared to that when the plate is normal to jet, is
85169. A reciprocating pump is also called a __________ displacement pump.
85170. The head available at the inlet of the turbine is known as net or effective head.
85171. In an axial flow reaction turbine, the water flows __________ to the axis of the wheel.
85172. The air vessel, in a reciprocating pump, is a cast iron closed chamber having an opening at its base.
85173. A double overhung Pelton wheel has
85174. Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft?
85175. In a reaction turbine, the water enters the wheel under pressure and flows over the vanes.
85176. If the ratio of all the corresponding linear dimensions are equal, then the model and the prototype are said to have
85177. The undershot water wheels are those in which
85178. A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used ?
85179. Which of the following pump is suitable for small discharge and high heads?
85180. The gross or total head of the turbine is the __________ of the water levels at the head race and tail race.
85181. The specific speed of a centrifugal pump may be defined as the speed of an imaginary pump, identical with the given pump, which will discharge one litre of water, while it is being raised through a head of one metre.
85182. In an outward flow reaction turbine
85183. A hydraulic press is a device used
85184. The flow ratio in case of Francis turbine varies from
85185. Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.?
85186. The function of guide vanes in a reaction turbine is to
85187. Which of the following statement is correct ?
85188. If the ratio of corresponding velocities at corresponding points are equal, then the model and the prototype are said to have dynamic similarity.
85189. The jet ratio is defined as the ratio of the
85190. Mechanical efficiency of a centrifugal pump is the ratio of
85191. The cavitation in a hydraulic machine is mainly due to
85192. In a centrifugal pump, the regulating valve is provided on the
85193. A Francis turbine is an outward flow reaction turbine.
85194. The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which
85195. The runaway speed of a hydraulic turbine is the speed
85196. The cavitation in a hydraulic machine
85197. The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is
85198. If the net positive suction head (NPSH) requirement for the pump is not satisfied, then
85199. A turbine develops 10000 kW under a head of 25 metres at 135 r.p.m. Its specific speed is
85200. The power of a centrifugal pump working under constant head and discharge increases with the speed.
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