85051. The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as
85052. The thermostatic expansion valve is also called
85053. In figure shown, E is a heat engine with efficiency of 0.4 and R is a refrigerator. It is given that Q2 + Q4 = 3Q1. The C.O.P. of the refrigerator is
85054. The specific humidity during cooling and dehumidification
85055. The capillary tube, as an expansion device, is used in
85056. In aircraft, air refrigeration Cycle is used because of
85057. The material of pipe lines for a system using freon as a refrigerant should be
85058. The temperature of air recorded by a thermometer, when the moisture present in it begins to condense, is called wet bulb temperature.
85059. In a pressure enthalpy chart, the space to the left of the saturated liquid line represents
85060. During sensible heating of air __________ decreases.
85061. The overall coefficient of heat transfer is used in problems of
85062. The boiling point of R-12 is about - 30°C.
85063. The wet bulb temperature during sensible heating of air
85064. In a refrigerating machine, heat rejected is __________ heat absorbed.
85065. Discharge of a centrifugal pump is
85066. A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is
85067. The static head of a centrifugal pump is equal to the __________ of suction head and delivery head.
85068. The ratio of actual work available at the turbine to the energy imparted to the wheel is known as __________ efficiency.
85069. Geometric similarity is said to exist between the model and the prototype, if both of them
85070. The speed of a turbine runner is
85071. Discharge of a centrifugal pump is (where N = Speed of the pump impeller)
85072. In a reaction turbine, the draft tube is used
85073. The power produced by the reaction turbine is __________ to the head of water.
85074. Slip of a reciprocating pump is defined as the
85075. The efficiency of a centrifugal pump will be maximum when the blades are bent backward.
85076. Multi-stage centrifugal pumps are used to
85077. The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is
85078. Theoretical power required (in watts) to drive a reciprocating pump is (where w = Specific weight of liquid to be pumped in N/m3, Q = Discharge of the pump in m3/s, Hs = Suction head in metres, and Hd = Delivery head in metres)
85079. Which of the following pump is preferred for flood control and irrigation applications?
85080. The efficiency of a Pelton wheel working under constant head __________ with the increase in power.
85081. The discharge of a centrifugal pump working under constant head __________ with the speed.
85082. Delivery head of water of a centrifugal pump is inversely proportional to diameter of its impeller.
85083. The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)
85084. Which of the following turbine is preferred for 0 to 25 m head of water?
85085. The speed ratio of a Francis turbine is defined as the ratio of the theoretical jet velocity to the peripheral speed at inlet.
85086. The overall efficiency of a reaction turbine is the ratio of
85087. Work done by a turbine __________ upon the weight of water flowing per second.
85088. The maximum number of jets, generally, employed in an impulse turbine without jet interference are
85089. In a reciprocating pump, air vessels are fitted to the suction pipe and delivery pipe close to the cylinder of the pump.
85090. Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)
85091. A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the
85092. When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases.
85093. A Francis turbine is used when the available head of water is
85094. The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is
85095. A hydraulic coupling belongs to the category of
85096. The principle of jet propulsion is used in driving the ships and aeroplanes.
85097. In the casing of a centrifugal pump, the kinetic energy of the water is converted into pressure energy before the water leaves the casing.
85098. The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as
85099. For centrifugal pump impeller, the maximum value of the vane exit angle is
85100. In a reaction turbine, the pressure head of water, while flowing over the vanes, is converted into kinetic head before leaving the wheel.
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