In a Coolidge tube, an electric field is applied

In a Coolidge tube, an electric field is applied
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In a Coolidge tube, an electric field is applied A. to increases the charge on the cathode rays. B ... D. to decrease the charge on the cathode rays.
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Explain construction and working of Coolidge tube for production of X-ray.

Description : Explain construction and working of Coolidge tube for production of X-ray.

Last Answer : Construction:- It consist of hard glass bulb with cathode and anode as shown in fig. Cathode is a metal filament kept at negative potential to the filament. Target T consist of copper ... the filament current, the thermionic emission of electron hence intensity of X- rays can be controlled.

Explain the production of X-ray’s using Coolidge tube.

Description : Explain the production of X-ray’s using Coolidge tube. 

Last Answer : Principle: When fast moving electrons are suddenly stopped then X- rays are produced.  Production: 1. When the cathode is heated by electric current it produced electron due to thermionic emissions ... filament current, penetrating power of X-ray depends on P.D. between cathode and anode. 

How did Coolidge attempt to preserve world peace?

Description : How did Coolidge attempt to preserve world peace?

Last Answer : Need answer

How did hoover and Coolidge feel about government involvement in business?

Description : How did hoover and Coolidge feel about government involvement in business?

Last Answer : Both President Coolidge and President Hoover were pro-business Republicans. They believed that any policies that helped big business (such as tax cuts) were good for the economy, and thus, ... the Great Depression. But those policies were definitely something both presidents supported in the 1920s.

How did Calvin Coolidge have leadership?

Description : How did Calvin Coolidge have leadership?

Last Answer : What is the answer ?

What color of hair does Calvin Coolidge have?

Description : What color of hair does Calvin Coolidge have?

Last Answer : rainbow

How did Calvin Coolidge die?

Description : How did Calvin Coolidge die?

Last Answer : Calvin Coolidge died of a coronary thrombosis at age 60, on January 5, 1933.

Who is Calvin Coolidge?

Description : Who is Calvin Coolidge?

Last Answer : He served as US President, 1923-1929He served as US President, 1923-1929He served as US President, 1923-1929He served as US President, 1923-1929He served as US President, 1923-1929He served as US President, 1923-1929

In a cathode ray tube, electric and magnesity of the magnetic fields are simultaneously applied at right angles to each other and the intensity of the

Description : In a cathode ray tube, electric and magnesity of the magnetic fields are simultaneously applied at right angles to each other and the intensity of the

Last Answer : In a cathode ray tube, electric and magnesity of the magnetic fields are simultaneously applied at right angles to each ... 01 T` and `E=50,000 V//m`.

The electric field applied in vertical directional to the cathode rays moving horizontally deflect them in __________

Description : The electric field applied in vertical directional to the cathode rays moving horizontally deflect them in __________

Last Answer : The electric field applied in vertical directional to the cathode rays moving horizontally deflect them in __________ ... a) and (b) D. None of these

(2) experience collision less frequently Explanation: When an electric field is applied, both the valence electrons and the free electrons move in the same direction. The hole direction is opposite to that of valence electron but the mobility is the same. Even for the same electric field, valence electrons cannot move as freely as the free electrons because its movement is restricted due to collisions. Therefore, the velocity of valence electrons is less compared to free electrons. In other words, the velocity of holes is less compared to free electrons. This means mobility is also less for a hole compared to free electron.

Description : (2) experience collision less frequently Explanation: When an electric field is applied, both the valence electrons and the free electrons move in the same direction. The hole direction is opposite to that ... to free electrons. This means mobility is also less for a hole compared to free electron.

Last Answer : Carbon dioxide is called a greenhouse gas because - (1) its concentration remains always higher than other gases (2) it is used in photosynthesis (3) it absorbs infrared radiation (4) it emits visible radiation

If an electric field is applied to a colloidal sol, the dispersed phase particles are found to move towards the electrode of opposite charge. If however, the dispersed phase is made stationary, the dispersion medium is found to move in the opposite direction. What is the term used for such movement of dispersion medium ?

Description : If an electric field is applied to a colloidal sol, the dispersed phase particles are found to move towards the electrode of opposite charge. If however, the dispersed phase is made stationary, the ... move in the opposite direction. What is the term used for such movement of dispersion medium ?

Last Answer : Ans. Electro osmosis. 

Find the electric field applied on a system with electrons having a velocity 5m/s subjected to a magnetic flux of 3.6 units. a) 15 b) 18 c) 1.38 d) 0.72

Description : Find the electric field applied on a system with electrons having a velocity 5m/s subjected to a magnetic flux of 3.6 units. a) 15 b) 18 c) 1.38 d) 0.72

Last Answer : b) 18

Conduction in metals is due to a) Electrons only b) Electrons and holes c) Holes only d) Applied electric field

Description : Conduction in metals is due to a) Electrons only b) Electrons and holes c) Holes only d) Applied electric field

Last Answer : a) Electrons only

The electrostatic energy in an electric field does not depend on which of the following? a) Magnitude of charges b) Permittivity c) Applied electric field d) Flux lines

Description : The electrostatic energy in an electric field does not depend on which of the following? a) Magnitude of charges b) Permittivity c) Applied electric field d) Flux lines

Last Answer : c) Applied electric field

A constant potential difference is applied across the plates of a parallel-plate capacitor. Neglecting any edge effects, the electric field inside the capacitor is: w) constant x) varying as one over r squared y) decreasing as one moves from the positive to the negative plate z) zero

Description : A constant potential difference is applied across the plates of a parallel-plate capacitor. Neglecting any edge effects, the electric field inside the capacitor is: w) constant x) varying as one over r squared y) decreasing as one moves from the positive to the negative plate z) zero

Last Answer : ANSWER: W -- CONSTANT

Five volts are applied across the plates of a parallel plate capacitor. The distance of separation of the plates is .02 meters. What is the magnitude of the electric field inside the capacitor?

Description : Five volts are applied across the plates of a parallel plate capacitor. The distance of separation of the plates is .02 meters. What is the magnitude of the electric field inside the capacitor?

Last Answer : ANSWER: 250 VOLTS PER METER or 250 NEWTONS PER COULOMB

The ability of materials to become polarized under an applied electric field is called _______

Description : The ability of materials to become polarized under an applied electric field is called _______ A) Ferroelectricity B) Paraelectricity C) Polectricity D) None of these

Last Answer : The ability of materials to become polarized under an applied electric field is called Paraelectricity

Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is __________ mm. (A) < 4 (B) > 4 (C) > 12.5 (D) < 10

Description : Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is __________ mm. (A) < 4 (B) > 4 (C) > 12.5 (D) < 10

Last Answer : (C) > 12.5

Bernoulli's equation is applied to (A) Venturimeter (B) Orifice meter (C) Pitot tube (D) All of these

Description : Bernoulli's equation is applied to (A) Venturimeter (B) Orifice meter (C) Pitot tube (D) All of these

Last Answer : Answer: Option D

A large negative voltage is applied to the plate of a diode, and a largewhat tube parameter has been exceeded?

Description : A large negative voltage is applied to the plate of a diode, and a largewhat tube parameter has been exceeded?

Last Answer : Peak Inverse Voltage (PIV).

The plate voltage of a tube will vary 126 volts when a 3-volt ac signal is applied to the control grid. What is the gain of this tube?

Description : The plate voltage of a tube will vary 126 volts when a 3-volt ac signal is applied to the control grid. What is the gain of this tube?

Last Answer : 42.

An ac voltage is applied across a diode. The tube will conduct when

Description : An ac voltage is applied across a diode. The tube will conduct when

Last Answer : Positive.

A hollow circular tube with a 2.3-cm I.D. and 2.5-cm O.D. is rigidly supported at its ends. A 2.5 kN-m torque is applied at the center of this tube. What is the maximum shear stress acting on this tube? (a) 2.87Mpa (b) 4.27 Mpa (c) 6.92 Mpa (d) 10.2 Mpa

Description : A hollow circular tube with a 2.3-cm I.D. and 2.5-cm O.D. is rigidly supported at its ends. A 2.5 kN-m torque is applied at the center of this tube. What is the maximum shear stress acting on this tube? (a) 2.87Mpa (b) 4.27 Mpa (c) 6.92 Mpa (d) 10.2 Mpa

Last Answer : (a) 2.87Mpa

A high voltage applied to a gas discharge tube containing neon gas at very low pressure causes a current to flow through the tube. Which one of the following are the particles that flow towards the cathode? Are they w) electrons x) protons y) negatively charged neon ions z) positively charged neon ions

Description : A high voltage applied to a gas discharge tube containing neon gas at very low pressure causes a current to flow through the tube. Which one of the following are the particles that flow towards the ... Are they w) electrons x) protons y) negatively charged neon ions z) positively charged neon ions

Last Answer : ANSWER: Z -- POSITIVELY CHARGED NEON IONS

Which of the following procedures should be used to maintain a large electric motor during periods of inactivity? A. A thin layer of air-drying varnish should be applied on the windings. B. Compressed air should be blown over areas where dust is deposited. C. Spraying a solvent periodically to remove carbon dust. D. Space heaters should be used to prevent condensation of moisture.

Description : Which of the following procedures should be used to maintain a large electric motor during periods of inactivity? A. A thin layer of air-drying varnish should be applied on the windings. B. ... periodically to remove carbon dust. D. Space heaters should be used to prevent condensation of moisture.

Last Answer : Answer: D

Inductance is the property of an electric circuit that _____________. A. opposes any change in the applied voltage B. opposes any change in the current flow through the circuit C. aids any changes in the applied voltage D. aids any changes in the current through the circuit

Description : Inductance is the property of an electric circuit that _____________. A. opposes any change in the applied voltage B. opposes any change in the current flow through the circuit C. aids any changes in the applied voltage D. aids any changes in the current through the circuit

Last Answer : Answer: B

How many electric gates are there in X-ray tube ?

Description : How many electric gates are there in X-ray tube ?

Last Answer : X-ray tube has 2 electric gates.

Hello, I smoke an electric cigarette, I have a filling about "power 6" and I do various tricks with it. That's not the point. Can Tube Tube Be A Cancer?

Last Answer : This cannot be determined unambiguously. There are also a number of harmful substances in the electronic cigarette. And a non-smoker can get tongue cancer

An electric current of `2.0 mu A` exists in a discharge tube. How much charge flows across a cross-section of the tube in 5 minutes ?

Description : An electric current of `2.0 mu A` exists in a discharge tube. How much charge flows across a cross-section of the tube in 5 minutes ?

Last Answer : An electric current of `2.0 mu A` exists in a discharge tube. How much charge flows across a cross-section of the tube in 5 minutes ?

The deflection system of a TV picture tube makes use of a) magnetic deflection b) electric deflection c) Both (a) and (b) d) None of these

Description : The deflection system of a TV picture tube makes use of a) magnetic deflection b) electric deflection c) Both (a) and (b) d) None of these

Last Answer : a) magnetic deflection

A tube light rated 50 watts (electric powers) is used for 10 hours per day for 30 days in a month. How much electric energy is being consumed by it per month? Similary per year, how much energy will be consumed?

Description : A tube light rated 50 watts (electric powers) is used for 10 hours per day for 30 days in a month. How much electric energy is being consumed by it per month? Similary per year, how much energy will be consumed?

Last Answer : Ans. 50 x 10 x 30 = 15000watts = 15000/1000= 15 units per month. Per units consumed: 15X12= 180units per year.

The finite element method is mostly used in the field of a.structural mechanics b.classical mechanics c.applied mechanics d.engineering mechanics

Description : The finite element method is mostly used in the field of a.structural mechanics b.classical mechanics c.applied mechanics d.engineering mechanics

Last Answer : d.engineering mechanics

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

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

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

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

A strong magnetic field is applied on a stationary electron, then

Description : A strong magnetic field is applied on a stationary electron, then

Last Answer : A strong magnetic field is applied on a stationary electron, then A. remains stationary B. ... . moves perpendicular to the direction of the field

A circular loop of mass m and radius r in X-Y plane of a horizontal table as shown in figure. A uniform magnetic field B is applied parallel to X-axis

Description : A circular loop of mass m and radius r in X-Y plane of a horizontal table as shown in figure. A uniform magnetic field B is applied parallel to X-axis

Last Answer : A circular loop of mass m and radius r in X-Y plane of a horizontal table as shown in figure. A uniform ... . `(mg)/(2pirB)` D. `(pirB)/(mgl)`

A circular loop which is in the form of a major arc of a constant magnetic field B is applied in the vertical direction such that the magnetic lines o

Description : A circular loop which is in the form of a major arc of a constant magnetic field B is applied in the vertical direction such that the magnetic lines o

Last Answer : A circular loop which is in the form of a major arc of a constant magnetic field B is applied in the ... `2 BIR sin(alpha//2)` D. None of these

A strong magnetic field is applied on a stationary electron, then

Description : A strong magnetic field is applied on a stationary electron, then

Last Answer : A strong magnetic field is applied on a stationary electron, then A. moves in the direction of ... the field C. remains stationary D. stats sprining

Air gap readings should be taken periodicly on electrical generation equipment to __________. A. determine the amount of varnish that can be applied to correct insulation problems B. determine the condition of the bearings C. provide for the correct proper tightening of the field coil bolts and correct lateral adjustment of the field coils D. increase machine efficiency

Description : Air gap readings should be taken periodicly on electrical generation equipment to __________. A. determine the amount of varnish that can be applied to correct insulation problems B. determine the ... field coil bolts and correct lateral adjustment of the field coils D. increase machine efficiency

Last Answer : Answer: B

The cycles per second developed by the alternator aboard your vessel is determined by _____________. A. the speed of the engine driving the alternator B. the resistance applied to the field rheostat C. the synchronous speed of induction D. the adjustments made to the voltage regulator

Description : The cycles per second developed by the alternator aboard your vessel is determined by _____________. A. the speed of the engine driving the alternator B. the resistance applied to the field rheostat C. the synchronous speed of induction D. the adjustments made to the voltage regulator

Last Answer : Answer: A

Under normal conditions, the speed of a two-speed squirrel cage induction motor is changed by varying the ____________. A. frequency of the applied voltage B. resistance in the rotor circuit C. number of field poles D. amplitude of the applied voltage

Description : Under normal conditions, the speed of a two-speed squirrel cage induction motor is changed by varying the ____________. A. frequency of the applied voltage B. resistance in the rotor circuit C. number of field poles D. amplitude of the applied voltage

Last Answer : Answer: C

A synchronous motor maintains synchronism with the rotating field because _____________. A. field strength varies directly with rotor slip B. DC current applied to the rotor coils causes the rotor magnets to lock in with the rotating flux of the stator C. the stator poles are dragged around due to the flux created by the excitation current D. the stator flux rotates in the opposite direction

Description : A synchronous motor maintains synchronism with the rotating field because _____________. A. field strength varies directly with rotor slip B. DC current applied to the rotor coils causes the rotor ... the flux created by the excitation current D. the stator flux rotates in the opposite direction

Last Answer : Answer: B

Diamagnetic materials are magnetised (A) Strongly (B) Only slightly (C) With eddy currents only (D) In a direction opposite to that of the applied field

Description : Diamagnetic materials are magnetised (A) Strongly (B) Only slightly (C) With eddy currents only (D) In a direction opposite to that of the applied field

Last Answer : (D) In a direction opposite to that of the applied field

Find the internal field when the applied field is 12 units, molecular field constant is 0.1 units and the magnetization is 74 units. a) 86 b) 62 c) 752 d) 19.4

Description : Find the internal field when the applied field is 12 units, molecular field constant is 0.1 units and the magnetization is 74 units. a) 86 b) 62 c) 752 d) 19.4

Last Answer : d) 19.4

Find the current density on the conductor surface when a magnetic field H = 3cos x i + zcos x j A/m, for z>0 and zero, otherwise is applied to a perfectly conducting surface in xy plane. a) cos x i b) –cos x i c) cos x j d) –cos x j

Description : Find the current density on the conductor surface when a magnetic field H = 3cos x i + zcos x j A/m, for z>0 and zero, otherwise is applied to a perfectly conducting surface in xy plane. a) cos x i b) –cos x i c) cos x j d) –cos x j

Last Answer : b) –cos x i

Cryptography and Cryptanalysis are sometimes grouped together under the ____term cryptology, encompassing the entire subject. In practice, "cryptography" is also often used to refer to the field as a whole, especially as an applied science: a) Umbrella b) Shield c) Veil d) None of These

Description : Cryptography and Cryptanalysis are sometimes grouped together under the ____term cryptology, encompassing the entire subject. In practice, "cryptography" is also often used to refer to the field as a whole, especially as an applied science: a) Umbrella b) Shield c) Veil d) None of These

Last Answer : a) Umbrella

Cryptography and Cryptanalysis are sometimes grouped together under the ____term cryptology, encompassing the entire subject. In practice, "cryptography" is also often used to refer to the field as a whole, especially as an applied science: a) Umbrella b) Shield c) Veil d) None of These

Description : Cryptography and Cryptanalysis are sometimes grouped together under the ____term cryptology, encompassing the entire subject. In practice, "cryptography" is also often used to refer to the field as a whole, especially as an applied science: a) Umbrella b) Shield c) Veil d) None of These

Last Answer : a) Umbrella

What causes dc bias energy to be absorbed by avalanche electrons and given up to the microwave field applied to an avalanche transit-time diode?

Description : What causes dc bias energy to be absorbed by avalanche electrons and given up to the microwave field applied to an avalanche transit-time diode?

Last Answer : The negative-resistance property.

When a uniform magnetic field B is applied to a current carrying coil, the coil will rotate in such a manner that its plane a) becomes parallel to B b) becomes anti-parallel to B c) makes an angle of 600 with B d) becomes perpendicular to B

Description : When a uniform magnetic field B is applied to a current carrying coil, the coil will rotate in such a manner that its plane a) becomes parallel to B b) becomes anti-parallel to B c) makes an angle of 600 with B d) becomes perpendicular to B

Last Answer : d) becomes perpendicular to B