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Which way do electrons flow in an electrochemical cell?

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Description : Do electrons flow from the anode to the cathode?

Answer : electrons flow from cathode to anode because the electron has a negative charge and repels from the negatively charged cathode whilst also attracting to the positively charged anode.

Description : What are ways we can measure the flow of electrons?

Description : What is the flow of electrons from one atom to another called?

Answer : Electric current

Description : What is the direction of the flow of electrons?

Answer : Electrons  flow    cathode   to   anode  or  in   an  oposite  direction  of   convection  current  flow  or  holes.

Description : Do cell phones use AC or DC current?

Answer : DC of course.

Description : Which have more free electrons: conductors or insulators? 

Answer : Conductors have many free electrons whereas insulators have very few or none at all.

Description : In fuel cell the __________ energy is converted into electrical energy.  (A) Mechanical (B) Chemical (C) Heat (D) Sound

Answer : In fuel cell the Chemical energy is converted into electrical energy. 

Description : Photocell and solar cell difference?

Answer : A photo cell is a light dependent resistor which decreases it resistance high intensity of light and is used to automatically control lights etc where as a solar cell solar or light energy into electrical energy.

Description : Explain with neat diagram the working of photo-voltaic cell. 

Answer : Diagram the working of photo-voltaic cell: Working:- Solar cell operates on principle of Photo-voltaic effect    Solar cell works in following steps: The solar cell is composed ... . When you connect loads such as a light bulb, electric current flows between the two electrodes.  

Description : Explain the characteristics of solar cell.  

Answer : Characteristics of solar cell : Explanation :- Solar cells produce direct current ( DC ) electricity and current times voltage equals power, so we can create solar cell I-V curves representing ... system so that it can operate as close to its optimal peak power point (MPP) as possible.

Description : State the principle of solar cell. What is necessity of series and parallel connection of solar cells.

Answer : Principle of solar cell:-  Working:- Solar cell operates on principle of Photo-voltaic effect Solar cell works in following steps:  The solar cell is composed of a P-type ... of Voltage & Current rating it is necessity of connecting series and parallel connection of solar cells.

Description : What are the number of valence electrons of atoms in semiconductor?

Answer : There are four valence electrons in the atom of a semiconductor.

Description : why current flows in opposite direction of electrons?

Answer : Hi team, the current flow is nothing but flow of electrons But the conventional direction I'd opposite to actual current flow . ..

Description : What is the movement of electrons from atom to atom is called?

Description : The substances which have a large number of free electrons and offer a low resistance are called?

Answer : The substances which have a large number of free electrons and offer a low resistance are called conductors.

Answer : E.m.f. of a Weston cell is accurately measured by electrostatic voltmeter.

Description : The number of electrons in the outer most orbit of carbon atom is?

Answer : The number of electrons in the outer most orbit of carbon atom is 4.

Description : What is the direction of flow of electric current in an electric circuit?

Answer : It  flows  from  anode  to  cathode  (direction  of   holes  flow)

Description : Why do you need a closed circuit for electricity to flow?

Answer : When  the  circuit  is  closed  , a potential  diffrence  is  realized  between  the  two  nodes  connected  .This  causes  flow of  electrons  and  convection  current.

Description : lf the wire which is vertical to this page has electron flow downwards the conductor will have

Answer : lf the wire which is vertical to this page has electron flow downwards the conductor will have a counter-clockwise field in the plane of the paper

Description : Classify hydro-electric power plants according to water flow regulation and explain in brief.

Answer : Classification of hydro-electric power plants according to water flow regulation of water flow:-  1. Large reservoir power plant 2. Run-off river (ROR) power plant with poundage 3. Run-off River ... depends upon rate of flow of water Initial cost is less Its purpose is to generate electricity.

Description : The current flow in a battery is due to ______ A) movement of ions B) movement of protons C) movement of holes D) movement of neutrons

Answer : The current flow in a battery is due to movement of ions

Description : Does current flow through a capacitor ?

Answer : Imagine a pipe with a flexible diaphram in the middle separating two haves of the pipe. Now the pipe is filled with air. If you apply a pressure to one end the diaphram will deform ... capacitor, the effects on electrons will be recreated across the boundary. But theres no electrical connection...

Description : State advantages & disadvantages of electromagnetic flow meter.

Answer : Advantage: Provides wide linear range. 2) Ability to measure reverses flow. 3) Gives rapid response to flow changes. 4) No obstruction is created to flow. 5) It can handle corrosive as ... and pipe networks with relatively short inside diameters. 3) It is useful for electrically conducting fluid.

Description : Compare variable head flow meter with variable area flow meter.

Answer : Parameter Variable head flowmeter Variable area flowmeter Working principle Restriction or obstacle is placed in the path of flow to create a differential Pressure. The pressure ... viscous fluid slurries and dirty fluids. In laboratories and testing and production lines.

Description : Describe principle of operation of Doppler type ultrasonic flow meter with diagram. 

Answer : Diagram: Working:  The flow meter consists of a crystal transducer mounted outside the pipe in which flow is to be measured. This transducer is a piezoelectric crystal which ... , so the frequency of the reflected wave is shifted to particle velocity, according to Doppler principle.

Description : Define laminar flow and turbulent flow.

Answer : Laminar flow : When a fluid flowing through the pipe at different speeds (fast at center and slow at edges), and the fluid particles move in layers with one layer sliding over the adjacent ... successive cross sections, then this flow is called as turbulent flow. Reynolds no is greater than 4000 

Description : Load flow studies involve solving simultaneous  (1) linear algebraic equations. (3) linear differential equations. (2) non-linear algebraic equations. (4) non-linear differential equations.

Answer : Load flow studies involve solving simultaneous non-linear algebraic equations.

Description : Inductance affects the direct current flow?

Answer : Inductance affects the direct current flow at the time of turning on and off.

Description : What is the direction of flow of current?

Answer : Current  flows  from  anode  to  cathode(opposite  direction  to  flow of  electrons)

Description : Why does charge flow from positive to negative?

Description : What is the direction of the conventional current flow?

Answer : The conventional current flow in opposite direction of flow of electrons. The electrons flow from negative terminal of battery to positive terminal of battery. And conventional current flow from positive terminal of battery to negative terminal of battery.

Description : What is the purpose of the salt bridge in an electrochemical cell? w) It allows ion migration. x) It allows electron flow. y) It prevents ion migration. z) It prevents electron flow.

Answer : ANSWER: W -- IT ALLOWS ION MIGRATION

Description : The device which allows reverse power flow and withstands highest switch frequency is (A) GTO (B) MOSFET (C) IGBT (D) Inverter grade SCR

Answer : The device which allows reverse power flow and withstands highest switch frequency is MOSFET

Description : In load flow Study, a PV bus is treated as a PQ bus when

Answer : Voltage at the bus becomes high 

Description : Axial flow compressor 

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 : Draw venture meter and write steps to measure flow rate.

Answer : Venturi meter consists of three sections that is converging section, throat section and diverging section. The flow is introduced to the meter through the inlet with diameter D' . The inclined angle ... to 15o . Flow rate is proportional to the square root of the differential pressure.

Description : List variable flow meter. 

Answer : 1. Variable area : Rotameter 2. Variable head : a) Venturi b) Orifice c) Pitot tube d) Nozzle

Description : Why does the magnetic field flow from north to south?

Description : A Unified Power Flow Controller (FACTS controller) is a voltage source converter based (A) Inter-phase power controller (B) Static Compensator (C) Combination of series and shunt compensators (D) Solid-state series compensator

Answer : A Unified Power Flow Controller (FACTS controller) is a voltage source converter based Combination of series and shunt compensators

Description : The power flow problem mathematical model for a linear transmission network (A) is non-linear (B) is linear (C) considers time variation of generation (D) does not consider tap-changing transformers

Answer : The power flow problem mathematical model for a linear transmission network is non-linear

Description : Precise control of reactive current flow entering the transmission and distribution systems can be minimized by using (A) synchronous condenser (B) static VAR capacitor (C) capacitor bank (D) thyristor switched reactor in parallel with capacitor

Answer : Precise control of reactive current flow entering the transmission and distribution systems can be minimized by using (A) synchronous condenser (B) static VAR capacitor (C) capacitor bank (D) thyristor switched reactor in parallel with capacitor

Description : Liquid flow rate is measured using (A) a pirani gauge (B) a pyrometer (C) an orifice plate (D) a bourdon tube

Answer : Liquid flow rate is measured using an orifice plate

Description : What is the direction of flow when charging a capacitor?

Description : What is the use of signal flow graph?

Description : An electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a : (1) Power transmittor (2) Battery (3) Uninterrupted power supply (UPS) (4) Generator

Answer : Battery

Description : Which one of the following statements is not correct? A Since voltage depends on concentrations, using standard conditions makes it easier to compare different electrochemical reactions. B We have ... half-reactions are determined by combining the relevant half-cell with a standardised half-cell.

Answer : C The direction of a redox reaction can only be determined experimentally. 

Description : what is UPFC?

Answer : UPFC stands for unified power flow controller.  It's used for real time control & dynamic compensation of ac transmission system.

Description : The device used to convert solar energy into electricity is (1) Photovoltaic cell (2) Daniell cell (3) Electrochemical cell (4) Galvanic cell

Answer : Photovoltaic cell

Answer : Flow of electrons in the circuit constitutes an electric current

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