Description : Why axial flow compressor is preferred for gas turbines for aeroplanes ?
Last Answer : Because it has low frontal area.
Description : In a/an __________ vessel, the fluid enters and leaves following plug flow. (A) Open (B) Closed (C) Open-closed (D) Close-opened
Last Answer : (B) Closed
Description : In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is __________ °C. (A) 20 (B) 60 (C) 120 (D) ∞
Last Answer : (D) ∞
Description : Adiabatic compression is one in which A. Temperature during compression remains constant B. No heat leaves or enters the compressor cylinder during compression C. Temperature rise follows a linear relationship D. Work done is maximum.
Last Answer : ANSWER : B
Description : A fluid in equilibrium cannot sustain : (A) tensile stress (B) compressive stress (C) shear stress (D) bending stress
Last Answer : A fluid in equilibrium cannot sustain : shear stress
Description : For laminar flow of Newtonian fluid in a circular pipe, the velocitydistribution is a function of the distance 'd' measured from the centre line of the pipe, and it follows a __________ relationship. (A) Logarithmic (B) Parabolic (C) Hyperbolic (D) Linear
Last Answer : (B) Parabolic
Description : In hydel power station, the motion produced in turbines is due to – (1) flow of water (2) burning of coal (3) burning of diesel (4) production of steam
Last Answer : (1) flow of water Explanation: A water turbine is a rotary machine that converts kinetic energy and potential energy of water into mechanical work. Hydroelectric power comes from water at work, water in motion. To generate electricity, water must be in motion. This is kinetic (moving) energy.
Description : The purpose of a surge tank is (A) To control the pressure variations due to rapid changes in the pipe line flow (B) To eliminate water hammer possibilities (C) To regulate flow of water to turbines by providing necessary retarding head of water (D) All of the above
Last Answer : Answer: Option D
Description : In hydel power station, the motion produced in turbines is due to (1) flow of water (2) burning of coal (3) burning of diesel (4) production of steam
Last Answer : flow of water
Description : Cerebrospinal fluid: a. is produced mainly by the lateral, third and fourth ventricles b. enters the subarachnoid space through foramina Lushka and Magendie c. is reabsorbed mainly into the lymphatics d. production is dependent of the blood pressure
Last Answer : is produced mainly by the lateral, third and fourth ventricles
Description : A Newtonian fluid is that (A) Which follows Newton's law of motion (B) Which needs a minimum shear, before it starts deforming (C) For which shear & deformation are related as T = µ (∂u/∂y) (D) None of these
Last Answer : (C) For which shear & deformation are related as T = µ (∂u/∂y)
Description : Which one of the following types of compressor is mostly used for supercharging of IC engines? (a) Radial flow compressor (b) Axial flow compressor (c) Root blower (d) Reciprocating compressor
Last Answer : Ans : c
Description : Compressor mostly used for supercharging of IC engine is A. Radial flow compressor B. Axial flow compressor C. Root blower compressor D. Reciprocating compressor
Last Answer : ANSWER : A
Description : Which one of the following type of compressor is mostly used for supercharging of I.C engine A. Radial flow compressor B. Axial flow compressor C. Root blower D. Reciprocating compressor.
Last Answer : ANSWER : C
Description : Why the work per kg of air flow in axial flow compressor is less compared to centrifugal compressor for same pressure ratio ?
Last Answer : Isentropic efficiency of axial flow compressor is higher.
Description : Paddle agitator (A) Is suitable for mixing low viscosity liquids (B) Produces axial flow (C) Moves at very high speed (D) None of these
Last Answer : (A) Is suitable for mixing low viscosity liquids
Description : Pick out the wrong statement pertaining to the turbine agitator. (A) Recommended peripheral speed for the turbine agitator is 200-250 metres/minute (B) Pitched blade turbine agitator gives only radial flow with ... l/4th of agitator diameter (with central disc, it is l/8th of the agitator diameter)
Last Answer : (B) Pitched blade turbine agitator gives only radial flow with complete absence of the axial flow
Description : A propeller agitator (A) Produces mainly axial flow (B) Is used for mixing high viscosity pastes (C) Runs at very slow speed (2 rpm) (D) All (A), (B) and (C)
Last Answer : (A) Produces mainly axial flow
Description : The Stoke's stream function applies to the (A) Irrotational flow only (B) Ideal/non i viscous fluids only (C) Cases of axial symmetry (D) None of these
Last Answer : (C) Cases of axial symmetry
Description : High specific speed of a pump implies that, it is a/an __________ pump. (A) Centrifugal (B) Mixed flow (C) Axial flow (D) None of these
Last Answer : (C) Axial flow
Description : __________ pumps are axial flow pumps. (A) Turbine (B) Propeller (C) Diffuser (D) None of these
Last Answer : (B) Propeller
Description : Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of __________ flow type. (A) Axial (B) Radial (C) Mixed (D) None of these
Last Answer : (A) Axial
Description : 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
Last Answer : (A) Open
Description : A mixed flow centrifugal pump (A) Employs such an impeller, through which the flow is a combination of radial & axial flow (B) Mixes the two fluids before pumping them (C) Pumps the two fluids separately and then mixes them (D) Employs impellers in both the radial & axial directions
Last Answer : (A) Employs such an impeller, through which the flow is a combination of radial & axial flow
Description : Propellers are (A) Axial flow mixers (B) Low speed impeller (C) Used for mixing liquids of high viscosity (D) Radial flow mixers
Last Answer : (A) Axial flow mixers
Description : __________ is an example of axial flow impeller. (A) Paddle (B) Turbine (C) Propeller (D) All (A), (B) and (C)
Last Answer : (C) Propeller
Description : Which of the following is most prone to pulsating discharge flow? (A) Centrifugal pump (B) Reciprocating pump (C) Gear pump (D) Axial flow pump
Last Answer : (C) Gear pump
Description : Low specific speed of a pump implies that, it is a/an __________ pump. (A) Axial flow (B) Centrifugal (C) Mixed flow (D) None of these
Last Answer : (B) Centrifugal
Description : Which of the following can be used to create a flow of gas, where no significant compression is required? (A) Reciprocating compressor (B) Blower (C) Axial flow compressor (D) Centrifugal compressor
Last Answer : (B) Blower
Description : A backmix reactor (A) Is same as plug-flow reactor (B) Is same as ideal stirred tank reactor (C) Employs mixing in axial direction only (D) Is most suitable for gas phase reaction
Last Answer : (B) Is same as ideal stirred tank reactor
Description : In a semi-batch reactor, (A) Mixing takes place in axial direction only (B) Velocity of reaction can be controlled (C) Condition similar to plug flow reactor exists (D) Residence time is constant
Last Answer : (B) Velocity of reaction can be controlled
Description : A plug-flow reactor is characterised by (A) High capacity (B) Presence of axial mixing (C) Presence of lateral mixing (D) Constant composition and temperature of reaction mixture
Last Answer : (C) Presence of lateral mixing
Description : Most commonly used pump for lifting water in water supply mains, is (A) Axial flow pump (B) Reciprocating pump (C) Rotary type pump (D) Centrifugal pumps
Last Answer : (A) Axial flow pump
Description : This type thresher consists of a flywheel with corrugation on its periphery and sides. Rims of flywheel fitted with chopping blades. b. Axial flow c. Dummy d. None of above
Last Answer : Ans- a. Syndicator
Description : Identify the picture. a) Hummer mill type b) Spike-tooth type c) Dummy type d) Axial flow type
Last Answer : Hummer mill type
Description : are mounted on the Periphery of a cylinder that rotates inside a closed casing and concave. a) Dummy type c) spike-tooth type b) Hummer type d) Axial flow type
Last Answer : spike-tooth type
Description : It consists of spike tooth cylinder, woven- wire mesh concave and upper casing provided with helical concave. a) Dummy type c) Spike-tooth type b) Hummer type d) Axial flow type
Last Answer : Axial flow type
Description : It consists of beats mounted on a shaft which rotates inside a closed casing and concave. a) Dummy type c) Spike-tooth type c) Hummer type d) Axial flow type
Last Answer : Dummy type
Description : Axial flow thresher uses a) Raspbar type cylinder b) Serrated disc type c) Spike tooth d) Hammer mill
Last Answer : a) Raspbar type cylinder
Description : Axial flow thresher uses a) Raspbar type cylinder b) Serrated disc type cylinder c) Spike tooth d) Hammer mill
Description : Axial flow thresher utilises (a) Rasp bar cylinder (b) Spike tooth cylinder (c) Hammer mill cylinder (d) Peg tooth cylinder
Last Answer : (b) Spike tooth cylinder
Description : The compression ratios for axial flow compressors are ____. a) Lesser b) Higher c) moderate d) None
Last Answer : b) Higher
Description : Differentiate between : (i) Reciprocating and rotary air compressor (ii) Centrifugal and axial flow compressor
Last Answer : (i) Reciprocating and rotary air compressor: Sr. No. Reciprocating air compressor Rotary air compressor 1 It is having to and fro motion. It is having rotary ... I.C. engine and for refrigerants and industrial gases. Used universally with large gas turbine.
Description : Axial flow compressor
Last Answer : Axial flow compressor : Working Principle: As the fluid enters and leaves in the axial direction, the centrifugal component in the energy equation does not come into play. Here the compression is fully ... the absolute velocity of the fluid and the stator converts this into pressure rise.
Description : An isothermal aqueous phase reversible reaction, P ⇌ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m3 .h is given by, r = 0.5CP - 0.125CR. A stream containing only P enters the reactor. The ... (in hours) for 40% conversion of P is (A) 0.80 (B) 1.33 (C) 1.60 (D) 2.67
Last Answer : (C) 1.60
Description : . An irreversible aqueous phase reaction, A + B → P, is carried out in an adiabatic mixed flow reactor. A feed containing 4kmole/m3 of each A and B enters the reactor at 8m3 /hr. If the temperature of ... be assumed to be independent of temperature and composition. (A) 190 (B) 290 (C) 390 (D) 490
Last Answer : (B) 290
Description : The most suitable refrigerant for a commercial ice plant is : (A) brine (B) NH3 (C) Freon (D) air
Last Answer : Ammonia NH3
Description : Dew point temperature is constant as long as there is : (A) no change in moisture content of the air (B) no change in volume of air (C) no change in dry bulb and wet bulb temperature (D) no change in relative and specific humidity of air
Last Answer : Dew point temperature is constant as long as there is : no change in moisture content of the air
Description : The comfort conditions in air conditioning are : (A) 22 ºC dry bulb temperature and 60% relative humidity (B) 25 ºC dry bulb temperature and 100% relative humidity (C) 20º C dry bulb temperature and 75% relative humidity (D) 15º C bulb temperature and 80% relative humidity
Last Answer : The comfort conditions in air conditioning are : 22 ºC dry bulb temperature and 60% relative humidity
Description : Air is normally dehumidified by : (A) injecting water (B) passing steam (C) heating (D) cooling
Last Answer : 1