Description : In case of supersonic flow of a fluid through pipeline, the 'Mach number' is (A) 0 (B) 1 (C) < 1 (D) > 1
Last Answer : (D) > 1
Description : Bats can sense obstacles because they produce – (1) supersonic sound waves (2) ultrasonic sound waves (3) infrasonic sound waves (4) micro sound waves
Last Answer : (2) ultrasonic sound waves Explanation: The reason that bats use ultrasound is because it has such a high frequency and it has a low diffraction or it bends less. They use this sound to do a ... come faster in a particular area than the rest of the sounds then they know that something is near.
Description : Bats can sense obstacles because they produce (1) supersonic sound waves (2) ultrasonic sound waves (3) infrasonic sound waves (4) micro sound waves
Last Answer : ultrasonic sound waves
Description : Is gravity really enough to pull a person to supersonic velocity?
Last Answer : answer:It has already been done. Here My assumption is terminal velocity only works if there is resistance to slow you down.
Description : In which case power required would be more a.In lifting up a weight of 100 kg at a velocity of 3 m/sec but accelerating upwards at 0.5 m/sec b.In lowering a weight of 100 kg along an a inclined plane ... speed of 3 m/sec e.In lowering the weight at a velocity of 3 m/sec and acceleration of 1 m/sec2
Last Answer : a. In lifting up a weight of 100 kg at a velocity of 3 m/sec but accelerating upwards at 0.5 m/sec
Description : The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be (A) Parabolic (B) Hyperbolic (C) Straight line (D) None of these
Last Answer : (A) Parabolic
Description : If an engineer is designing a building in an area that has an occasional supersonic flight pass over it the engineer should apex?
Last Answer : design extra reinforcements in the buildings windows so that they can withstand the vibrations from sonic booms
Description : With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the (A) Velocity increases (B) Pressure decreases (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : A convection process in which an external device, such as a fan, is used to produce the fluid flow. a. Forced Convection b. External Convection c. Placid Convection d. Thermionic Convection
Last Answer : Forced Convection
Description : The instrument for measurement of flow/ velocity is________. A. Bimetallic. C) Turbine meter. B. Manometer. D) Wattmeter
Last Answer : Turbine meter
Description : A fluid flows in a steady manner between two section in a flow line at section 1: A 1 = 1ft², V1 = 100fpm, volume1 of 4ft³/lb. at sec2: A2 = 2 ft², p= 0.20 lb/ft³ calculate the velocity at section 2. a. 625 fpm b. 567 fpm c. 356 fpm d. None of the above
Last Answer : 625 fpm
Description : Calculate: a. Mass flow rate in lb/hr. b. The velocity at section 2 in fps a. 800,000lb/hr;625ft/s b. 900,000lb/hr;625 ft/s c. 888,000lb/hr;269 ft/s d. 700,000lb/hr;269 ft/s m = A1V!/V1
Last Answer : 900,000 lb/hr;625 ft/s
Description : How does a supersonic electric jet airplane work?
Last Answer : They don’t work.
Description : How well do plug-in supersonic devices work to repel spiders?
Last Answer : Source: http://www.pestproducts.com/spider.htm Spider Elimination Kit Treat the perimeter of the building with a professional residual pesticide such as Cynoff WP WSB, Demon WP or Suspend SC at maximum strength. ... power dusting with Delta Dust would be best. I've never used these - just google'd.
Description : Can you make a shock wave of light by breaking the light barrier just like supersonic airplanes break the sound barrier? -Physics
Last Answer : Yes and no. It depends on the material you are in. In order to keep things from traveling into the past, and thereby preserve local conservation of mass-energy, and thereby prohibit the universe ... eye, it is detected by cameras and serves as an important tool for scientists studying cosmic rays.
Description : Who is the creator of Supersonic Concord ?
Last Answer : France and Britain are the makers of Supersonic Concord.
Description : A supersonic jet produces sonic boom in a
Last Answer : A supersonic jet produces sonic boom in a A. Cone-like area behind the jet B. 10-100 km area C. both A and B D. Area of 10 km all around it.
Description : Why have we been able to build supersonic aircrafts but not supersonic ships?
Last Answer : Because water has a greater resistance than air, so a boat wouldneed to be incredibly powerful to go supersonic, beyond the limitsof current technology. The current water speed record is 'only'345mph.
Description : Supersonic aircraft fly with the speed_____.
Last Answer : Greater than the speed of sound
Description : A supersonic plane flies at the speed (a) Less than the speed of the sound (b) Of sound (c) Greater than the speed of the sound (d) Of light
Last Answer : Ans:(c)
Description : Supersonic jet causes pollution by thinning of - (1) O3 layer (2) O2 layer (3) SO2 layer (4) CO2 layer
Last Answer : (1) O3 layer Explanation: Three forms (or allotropes) of oxygen are involved in the ozone-oxygen cycle: oxygen atoms (O or atomic oxygen), oxygen has (O2 or diatomic oxygen), and ... oxygen radicals. The atomic oxygen radicals then combine with separate O2 molecules to create two O3 molecules.
Description : Supersonic plane fly with the speed - (1) less than the speed of sound (2) of sound (3) greater than the speed of sound (4) of light
Last Answer : (3) greater than the speed of sound Explanation: The regimes of flight are subsonic, transonic, supersonic and hypersonic. Vehicles that fly at supersonic speeds are flying faster than the speed of sound. The speed of sound is about 768 miles per hour (1,236 kilometers per hour) at sea level.
Last Answer : (3) greater than the speed of sound Explanation: Supersonic travel is a rate of travel of an object that exceeds the speed of sound (Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) ... this speed is approximately 344 m/s, 1,125 ft/s, 768 mph, 667 knots, or 1,235 km/h.
Description : What is the high frequency sound that cannot be heard by the human ear? A. Ultrasonic B. Transonic C. Subsonic D. Supersonic
Last Answer : A. Ultrasonic
Description : Supersonic air plane creates a shock wave called
Last Answer : Sonic Boom
Description : The supersonic jets cause pollution by the thinning of (a) O2 layer (b) O3 layer (c) CO2 layer (d) SO2 layer.
Last Answer : (b) O3 layer
Description : Atmospheric pollution caused by the exhaust gas of supersonic transport air-crafts is mostly in the atmospheric region called (A) Thermosphere (B) Stratosphere (C) Troposphere (D) Mesosphere
Last Answer : (B) Stratosphere
Description : Indian and Russian scientists successfully test-fired a supersonic cruise missile named (1) GSAT – 1 (2) GSLV (3) Brahmos (4) INSAT –3B
Last Answer : Brahmos
Description : Supersonic jet causes pollution by thinning of (1) O3 layer (2) O2 layer (3) SO2 layer (4) CO2 layer
Last Answer : O3 layer
Description : The time required to stop a car moving with a velocity 20 m/sec within a distance of 40 m is equal to a.8 sec b.2 sec c.4 sec d.10 sec e.6 sec
Last Answer : c. 4 sec
Description : If a gymnast sitting on a rotating stool, with his arms outstretched suddenly lowers his arm a.the angular velocity will remain constant b.the angular momentum will increase c.the angular velocity will decrease d.his moment of inertia will decrease e.107 dynes
Last Answer : d. his moment of inertia will decrease
Description : Why is exhaust steam coming out of turbine is admitted to a steam header? a) To increase the pressure b) To decrease the velocity c) To decrease the pressure drop d) To control the pollution
Last Answer : To decrease the pressure drop
Description : The principle of conservation of energy cannot be applied in case of a.Flow of heat through a metal b.Ideal flow of water in a pipe c.Simple pendulum d.Sliding of a particle along inclined plane with friction e.A particle moving in gravitational field
Last Answer : e. A particle moving in gravitational field
Description : The principle of conservation of energy cannot be applied in case of a.Flow of water in a pipe b.A particle moving in gravitational field c.Frictional movement of a particle over a surface d.Frictionless movement of a principle over a surface e.Simple pendulum
Last Answer : c. Frictional movement of a particle over a surface
Description : In case of Imhoff tanks, A. The shape is rectangular B. Detention period is 2 hours C. The velocity of flow is restricted to 0.30 m/minute D. All the above
Last Answer : ANS: D
Description : In case of laminar flow of fluid through a circular pipe, the (A) Shear stress over the cross-section is proportional to the distance from the surface of the pipe (B) Surface of velocity distribution is a ... occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius)
Last Answer : (B) Surface of velocity distribution is a paraboloid of revolution, whose volume equals half the volume of circumscribing cylinder
Description : The ratio of average fluid velocity to the maximum velocity in case of laminar flow of a Newtonian fluid in a circular pipe is (A) 0.5 (B) 1 (C) 2 (D) 0.66
Last Answer : (A) 0.5
Description : What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition? (A) 0.5 (B) 0.67 (C) 1 (D) 2
Last Answer : (D) 2
Description : he pressure drop per unit length of pipe incurred by a fluid 'X' flowing through pipe is Δp. If another fluid 'Y' having both the specific gravity & density just double of that of fluid 'X', flows through the same pipe ... then the pressure drop in this case will be (A) Δp (B) 2Δp (C) Δp 2 (D) Δp/2
Last Answer : (B) 2Δp
Description : Velocity at a certain point in case of streamline flow is (A) Constant (B) Independent of time (C) Both (A) & (B)
Description : Pick out the wrong statement: (A) Greater is the kinematic viscosity of the liquid, greater is the thickness of the boundary layer (B) Blowers develop a maximum pressure of 2 atmospheres ( ... factor in case of turbulent flow of liquids in pipe depends upon relative roughness & Reynolds number
Last Answer : (C) Friction losses in pipe fittings are generally expressed in terms of velocity heads
Description : Mass velocity in case of steady flow and through a constant crosssection conduit is independent of the (A) Temperature (B) Pressure (C) Both (A) & (B) (D) Neither (A) nor (B)
Description : In case of turbulent flow of a Newtonian fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity) (A) Vavg (B) 1.2 Vavg (C) 1.5 Vavg (D) 1.8 Vavg
Last Answer : (B) 1.2 Vavg
Description : The fluid velocity varies as the cube of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop for __________ fluid. (A) Newtonian (B) Pseudo-plastic (C) Dilatent (D) Bingham plastic
Last Answer : (B) Pseudo-plastic
Description : The ratio of maximum to average velocity in case of streamline flow between parallel plates is (A) 1 (B) 1.5 (C) 2 (D) 2.5
Last Answer : (B) 1.5
Description : The fluid velocity varies as the square of the cylindrical pipe diameter, in case of steady state laminar flow at constant pressure drop, for __________ fluid. (A) Newtonian (B) Dilatant (C) Pseudo-plastic (D) Non-Newtonian
Last Answer : (A) Newtonian
Description : Pick out the wrong statement. (A) Surface tension of a liquid is because of the difference in magnitude of adhesive & cohesive forces (B) A hydrometer used for the determination of ... Turbulent fluid flow is characterised by the rapid fluctuation of instantaneous pressure & velocity at a poin
Last Answer : (C) In case of unsteady fluid flow, the velocity at any given point does not change with time
Description : The fluid velocity varies as the square root of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop of __________ fluid. (A) Dilatent (B) Pseudo-plastic (C) Bingham plastic (D) Newtonian
Last Answer : (A) Dilatent