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Can a power surge erase a hard drive?
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Description :

What can you do to prevent a power surge?

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Can power surge damage your computer?

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Description :

What would cause a power surge in a house?

Answer :

If your neibour / other flat owners / your maintainer staff switch on any type of inductive load that can cause power surge / dip  

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Description :

State the purpose of surge tank and spill way in hydroelectric power station.

Answer :

Surge tank :- A surge tank is the small reservoir or tank. It is open at the top. It is installed near Vale house of turbine. It avoids water hammer effect when load on turbine reduces. (It ... ; during floods etc. In this way spill way avoids damage of dam due to excess pressure of water.

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The synchronous motor which works on leading power factor and does not drive any mechanical load is called?

Answer :

The synchronous motor which works on leading power factor and does not drive any mechanical load is called synchronous condenser.

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Explain transformer isolated drive circuits providing both signal and power.

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What is meant by a voltage surge?

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Description :

State the function of following with respect to hydro power plant : I) Storage reservoir II) Surge tank II) Spillways IV) Trash rack

Answer :

I) Storage reservoir: It is the basic requirement of hydroelectric plant. Its purpose is to store water which may be utilized to run the prime mover to produce electrical power. A reservoir stores during ... of nozzles of impulse turbines. It is made of steel bars and is placed across the intake.

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What is a hard real time system?

Answer :

If the real-time systems have minimum interrupt latency and task deadline with prescribe time limits then it is known as hard real-time systems.  If these two requirements meet in real time systems but not always then it is known as soft real-time systems.

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Hard steel is suitable for making permanent magnets because?

Answer :

Hard steel is suitable for making permanent magnets because it has good residual magnetism.

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Description :

The function of a surge tank is to  (1) produce surge in the pipeline (2) relieve water hammer pressure in the penstock (3) supply water at constant pressure (4) none of above

Answer :

The function of a surge tank is to relieve water hammer pressure in the penstock

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Description :

The surge impedance for over head line is taken as  (1) 10-20 ohms (2) 50-60 ohms (3) 100-200 ohms (4) 1000-2000 ohms

Answer :

The surge impedance for over head line is taken as 100-200 ohms

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Description :

Surge absorbers are used for protection against

Answer :

Surge absorbers are used for protection against low voltage high frequency oscillations

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Description :

What is a drive in electrical controls?

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Description :

Adjustable-speed drive

Answer :

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Description :

In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current

Answer :

In an adjustable speed ac drive which quantity gets reduced above rated speed ? (A) developed torque (B) stator frequency (C) reduced starting torque (D) stator current

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Answer :

For constant torque drive armature voltage control speed control method is preferred.

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What is the need for electrically isolated drive circuits?

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What are the fundamental requirements of gate drive ICs?

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Description :

What is the difference between AC and DC drive?

Answer :

AC means alternating current It's Frequency is 50hz Dc means direct current ItsI Frequency is 0Hz

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Description :

What is an electric motor drive?

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Description :

What does an electric drive do?

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Description :

Explain MOSFET gate drive circuit and totem pole configuration.

Answer :

MOSFET gate drive circuit: The turning on and turning off of MOSFET can be controlled from gate to source voltage signal. If the gate to source voltage of MOSFET exceeds threshold ... this configuration, the two switches (transistors) are used in totem pole arrangement with a comparator.

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Description :

Explain open emitter BJT drive circuit.

Answer :

open emitter BJT drive circuit:

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Description :

Explain DC coupled drive circuit with unipolar output.

Answer :

DC coupled drive circuit with unipolar output: The figure shows the circuit and waveforms

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Description :

Explain thyristor gate drive circuit.

Answer :

Thyristor Gate Drive Circuit: The thyristor can be turned on by pulse voltage signal at gate terminal and it does not require continuous drive signal like the transistor. The gate ... circuit provide required minimum gate voltage and gate current then the thyristor conducts properly.

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Description :

basic gate drive circuit of GTO

Answer :

basic gate drive circuit of GTO

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Description :

Scherbius Drive System

Answer :

Scherbius Drive System

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Description :

Kramer Drive System

Answer :

Kramer Drive System Kramer drive is a rotor side speed control drive of induction motor. Slip is the difference between synchronous speed and rotor speed. It is the ... and DC motor. The static Kramer drive is costlier because of the cost of DC motor.

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Description :

Advantages of Variable Frequency Drive (VFD)

Answer :

Advantages of Variable Frequency Drive (VFD)

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Description :

Can you have a power factor greater than 1?

Answer :

We cannot have power factor greater than 1. As it is a measure of cosine of angle between voltage and current. 

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Description :

What is a digital power meter?

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What is a power quality analyzer?

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What is the use of power factor correction?

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Description :

What is the best power factor?

Answer :

It is unity power factor but difficult to achieve in dynamic loads

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Description :

What is power factor angle?

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What is an RF Power Meter?

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What causes random power outages?

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Description :

What is the advantage of high power factor?

Answer :

Reduced copper losses Smaller conductor size Improve voltage regulation Increase system capability Less energy bill

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Why do we need to correct power factor?

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What is power logger?

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Description :

How do you measure power factor?

Answer :

P= 1.83*V*I*[email protected] where P is power           V is voltage            I is current           COS @ is P.F [email protected]= P/(1.83*V*I)  in other way cos @ = true power/apparent power

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Description :

What are the power quality disturbance?

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What is harmonic in power quality?

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Description :

What is power quality meter?

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What are the different power quality issues?

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What is good power quality?

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What is power quality monitoring?

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Description :

How often do power surges occur?

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Description :

What is meant by power dip?

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