Singing of telephone wires in the wind occurs due to :
 (a) Vibrations caused by birds as they sit on or get off, the wires
 (b) Tensioning at the ends
 (c) Magnus effect
 (d) Generation of Karman Vortex street

1 Answer

Answer :

(d) Generation of Karman Vortex street

Related questions

Description : Which of the following losses of pre-stress occurs only in pre-tensioning and not in posttensioning? (A) Elastic shortening of concrete (B) Shrinkage of concrete (C) Creep of concrete (D) Loss due to friction

Last Answer : Answer: Option A

Description : Why, when birds sit on transmission lines or current wires doesn't get shock?

Last Answer : It's true that if birds touch the single one line (phase or neutral) they don't get electrical shock... if birds touch 2 lines than the circuit is closed and they get electrical shock. so ... is grounded..So that means that human who touch the line closes the circuit between phase and neutral.

Description : Why, when birds sit on transmission lines or current wires doesn't get shock?

Last Answer : A:Its true that if birds touch the single one line (phase or neutral) they don't get electrical shock... if birds touch 2 lines than the circuit is closed and they get electrical shock.. so if a human ... the air. If he is standing on the ground then touching the line (phase) he will get a shock.

Description : Pick up the correct statement from the following: (A) The maritime structures should be designed to withstand wave motion of air (B) The wind vortex results in conical depression in the air surface (C) A tube of air rotating at hundreds of kilometres per hour forms a tornado (D) all of the above

Last Answer : (D) all of the above

Description : Pick out the wrong statement about cavitation. (A) Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation ... (D) Large scale cavitation cannot damage pipeline, restrict fluid flow and damage steam turbine blades

Last Answer : (D) Large scale cavitation cannot damage pipeline, restrict fluid flow and damage steam turbine blades

Description : Post tensioning system (A) Was widely used in earlier days (B) Is not economical and hence not generally used (C) Is economical for large spans and is adopted now a days (D) None of these

Last Answer : Answer: Option D

Description : Select the incorrect statement (A) The loss of pre-stress is more in pre-tensioning system than in post-tensioning system. (B) Pre-tensioning system has greater certainty about its durability. (C ... or bridges, post-tensioning system is cheaper than pre-tensioning system (D) None of the above

Last Answer : Answer: Option D

Description : Due to the impact of water wave on a sea shore structure (A) Hydrostatic pressure coupled with a strong momentary impact is caused (B) Vibrations are subjected (C) Internal pressure is developed (D) All of the above

Last Answer : (D) All of the above

Description : Which of the following conditions is worst with regard to wake vortex turbulence? a. Lights winds near the surface b. Strong winds near the surface c. Marked vertical wind shear d. Marked atmospheric turbulence near the ground

Last Answer : a. Lights winds near the surface

Description : Where is Albertus Magnus College?

Last Answer : Albertus Magnus College is located in the state of Connecticut.

Description : Who discovered cement? (1) Agassit (2) Albertus Magnus (3) Joseph Aspdin (4) Janseen

Last Answer : Joseph Aspdin

Description : Pick out the correct statement. (A) A forced vortex occurs when fluid rotates as a solid about an axis (B) In laminar flow, Newton's law of viscosity does not apply (C) A free vortex occurs, when fluid rotates as a solid (D) In turbulent flow, there are neither cross-currents nor eddies

Last Answer : (A) A forced vortex occurs when fluid rotates as a solid about an axis

Description : The crisp Fall air, walking on crunchy leaves, crunchy Macs in season, that smell; or a Springtime breeze, being able to remove the many layers of Winter clothing, birds singing, flowers blooming; which season do you prefer?

Last Answer : I live in New England, what’s not to love about Fall? well, maybe November, leaves are gone, rain is cold…

Description : Its 1:15am: Why do I hear birds singing?

Last Answer : Must Owls. Are they saying “Whooooo”?

Description : Why do shoes hang from telephone wires?

Last Answer : In my old neighborhood bullies would beat you up, take your shoes and throw them on the wires so you couldn’t get to them. It was like a deer’s head for their trophy room.

Description : Why telephone wires need to be slack in the summer?

Last Answer : Feel Free to Answer

Description : Which of the following statements is correct concerning the circuits in a sound powered telephone system? A. The ringing circuit is composed of only one common wire to ground. B. The common ... connected to each station. D. The talking and calling circuits are electrically dependent upon each other.

Last Answer : Answer: B

Description : The local loop of the telephone system is understood to be A. a single piece of wire connecting the subscriber's telephone set to another telephone set in an adjacent room B. a two-wire or four- ... a facsimile machine to a computer D. a group of wires connecting a telephone set to a modem

Last Answer : B. a two-wire or four-wire communication circuit between the customer’s premise and central office

Description : Why are telephone wires between two poles kept loose?

Last Answer : Ans: Telephone wires are kept loose between two poles so that they are protected from being broken due to expansion and contraction caused by the change of temperature in summers and winters.

Description : Internet access by transmitting digital data over the wires of a local telephone network is provided by  leased line  digital subscriber line  digital signal line  None of the Above

Last Answer :  digital subscriber line

Description : Different computers are connected to a LAN by a cable and a (1) modem (2) interface card (3) special wires (4) telephone lines

Last Answer : interface card

Last Answer : Overhead telephone wires are made of steel.

Description : Stability of an existing structure may be disturbed by (A) Rising of water table (B) Vibrations caused by traffic movements (C) Mining in the neighbourhood (D) All the above

Last Answer : Answer: Option D

Description : For what type of structures do you recommend post-tensioning?

Last Answer : 1) High rise buildings. In long span slab where beam is not provided & the slab of assembly hall, cinema theaters etc. like structure where the distance between columns are more, then post ... Post Tensioning is used extensively for slabs on grade where soils are likely to move (expansive soils)

Description : Draw a neat labeled diagram of Automatic Weight Tensioning and Temperature Compensation and give any two advantages of the same.

Last Answer :  figure of automatic weight tensioning Advantages of automatic weight tensioning and temperature compensation:  Sparkless current collection at higher speeds.  OHE becomes more dynamically ... of unregulated OHE.  Because of fixed tension, fluctuations in the height are minimized

Description : During agitation of liquids, the (A) Froude number is independent for the curves between power number and Reynolds number in baffled system (B) Power number becomes independent of impellers Reynolds number at high Reynolds number, ... , the centre vortex) on the power number (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Description : What are deterministic vibrations? * (A)Vibrations caused due to known exciting force (B)Vibrations caused due to unknown exciting force (c) Vibrations which are aperiodic in nature (D) None of the above

Last Answer : (A)Vibrations caused due to known exciting force

Description : Deterministic vibrations are A Vibrations caused due to unknown exciting force B Vibrations caused due to known exciting force C Vibrations which are aperiodic in nature D None of the mentioned

Last Answer : B Vibrations caused due to known exciting force

Description : What are deterministic vibrations? a. Vibrations caused due to known exciting force b. Vibrations caused due to unknown exciting force c. Vibrations which are aperiodic in nature d. None of the above

Last Answer : a. Vibrations caused due to known exciting force

Description : The vertical dotted line connecting the small circular symbols at coordinates '05L', '09L', '13L', '21L', '25L', etc., shown in the illustration, indicate that all _______________. EL-0100 A. contacts are ... board 'TB2' C. wires are grounded at both ends of the line D. wires have a common shield

Last Answer : Answer: B

Description : What is the meaning of the name Karman ?

Last Answer : The Arabic name Karman means "generous" , " selfless" , " one who respects others".

Description : Border line which separates outer space from Earth’s atmosphere is known as------? A. Durand line B. Space line C. Venus line D. Karman line (Answer)

Last Answer : D. Karman line (Answer)

Description : The equation, Nst = (f/2)/[1 + 5 (Npr - 1) √(f/2)], corresponds to __________ analogy. (A) Von-Karman (B) Reynolds (C) Colburn (D) Prandtl

Last Answer : (D) Prandtl

Description : The equation f -0.5 = 4.07 loge (NRe √f) -0.6 is called the __________. (A) Colebrook formula (B) Von-Karman equation (C) Fanning equation (D) None of these

Last Answer : (B) Von-Karman equation

Description : Which of the following equations is valid for laminar flow of a fluid through packed bed? (A) Fanning equation (B) Kozeny - Karman equation (C) Hagen-Poiseuille equation (D) Blake-Plummer equation

Last Answer : (B) Kozeny - Karman equation

Description : The equation relating friction factor to Reynold number, f -0.5 = 4 loge (NRe /√f) -0.4 , is called the __________ equation. (A) Nikuradse (B) Von-Karman

Last Answer : (B) Ergun's

Description : The flow of water through the hole in the bottom of a wash basin is an example of (A) Steady flow (B) Uniform flow (C) Free vortex (D) Forced vortex

Last Answer : Answer: Option C

Description : Flow occurring in a pipeline when a valve is being opened is (A) Steady (B) Unsteady (C) Laminar (D) Vortex

Last Answer : Answer: Option B

Description : In a free vortex motion, the radial component of velocity everywhere is (A) Maximum (B) Minimum (C) Zero (D) Nonzero and finite

Last Answer : Answer: Option C

Description : The tangential velocity of the water element having a free vortex is (A) Directly proportional to its distance from the centre (B) Inversely proportional to its distance from the centre (C) Directly ... (distance)2 from the centre (D) Inversely proportional to its (distance)2 from the centre

Last Answer : Answer: Option B

Description : When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as (A) Steady flow (B) Turbulent flow (C) Vortex flow

Last Answer : Answer: Option C

Description : In a forced vortex, the velocity of flow everywhere within the fluid is (A) Maximum (B) Minimum (C) Zero (D) Nonzero finite

Last Answer : Answer: Option D

Description : The movement of air mass in the case of Tornado can be described as : (a) Forced vortex throughout (b) free vortex throughout (c) Forced vortex at the core and free vortex outside (d) Free vortex at the core and forced vortex outside

Last Answer : (c) Forced vortex at the core and free vortex outside

Description : Littoral drift (A) Is the raised line of sand, parallel to the sea coast (B) Is the slow movement of surface water at sea caused by the wind (C) Is a current parallel to the shore, caused due to tangential component of the wind (D) Is a current perpendicular to the shore line caused due to wind

Last Answer : (C) Is a current parallel to the shore, caused due to tangential component of the wind

Description : Underground cables are laid at sufficient depth (a) to minimise temperature stresses (b) to avoid being unearthed easily due to removal of soil (c) to minimise the effect of shocks and vibrations due to gassing vehicles, etc. (d) for all of the above reasons

Last Answer : (c) to minimise the effect of shocks and vibrations due to gassing vehicles, etc.

Description : 10] The main reason for generation of harmonics in a transformer could be A. Fluctuating load B. Poor insulation C. Mechanical vibrations D. Saturation of core

Last Answer : D) saturation of core

Description : Burning in the toilet for a long time ? I am 18 years old. My toilet has been burning on the street for three years. No blood goes. But very irritating. Urine and frequent burns. Even if you sit ... like a sack that encloses with a drawstring. Please tell, whats the story of them big puppys .....

Last Answer : It causes burning sensation in the urine due to your urinary tract infection. But itching or burning in the anus can be due to various reasons. The most common causes of this problem are high humidity , mild ... of water , do not eat fried or televaja food. Do not eat stale food in the market.