Description : What can you do to prevent a power surge?
asked
Mar 10, 2018
by
anonymous
Description : Can power surge damage your computer?
asked
Mar 10, 2018
by
anonymous
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
asked
Mar 10, 2018
by
anonymous
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.
asked
Sep 8, 2018
by
anonymous
Description : 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.
asked
Mar 18, 2018
by
anonymous
Description : Explain transformer isolated drive circuits providing both signal and power.
asked
Mar 11, 2018
by
anonymous
Description : What is meant by a voltage surge?
asked
Mar 10, 2018
by
anonymous
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.
asked
Sep 8, 2018
by
anonymous
Description : 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.
asked
Dec 16, 2017
by
anonymous
Description : Hard steel is suitable for making permanent magnets because?
Answer :
Hard steel is suitable for making permanent magnets because it has good residual magnetism.
asked
Mar 25, 2018
by
anonymous
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
asked
Apr 29, 2018
by
anonymous
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
asked
May 1, 2018
by
anonymous
Description : Surge absorbers are used for protection against
Answer :
Surge absorbers are used for protection against low voltage high frequency oscillations
asked
Apr 26, 2018
by
anonymous
Description : What is a drive in electrical controls?
asked
Mar 10, 2018
by
anonymous
Description : Adjustable-speed drive
Answer :
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asked
Jul 6, 2019
by
anonymous
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
asked
Apr 28, 2018
by
anonymous
Answer :
For constant torque drive armature voltage control speed control method is preferred.
asked
Mar 20, 2018
by
anonymous
Description : What is the need for electrically isolated drive circuits?
asked
Mar 11, 2018
by
anonymous
Description : What are the fundamental requirements of gate drive ICs?
asked
Mar 11, 2018
by
anonymous
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
asked
Mar 10, 2018
by
anonymous
Description : What is an electric motor drive?
asked
Mar 10, 2018
by
anonymous
Description : What does an electric drive do?
asked
Mar 10, 2018
by
anonymous
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.
asked
Feb 19, 2018
by
anonymous
Description : Explain open emitter BJT drive circuit.
Answer :
open emitter BJT drive circuit:
asked
Feb 19, 2018
by
anonymous
Description : Explain DC coupled drive circuit with unipolar output.
Answer :
DC coupled drive circuit with unipolar output: The figure shows the circuit and waveforms
asked
Feb 19, 2018
by
anonymous
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.
asked
Feb 19, 2018
by
anonymous
Description : basic gate drive circuit of GTO
Answer :
basic gate drive circuit of GTO
asked
Nov 14, 2017
by
anonymous
Description : Scherbius Drive System
Answer :
Scherbius Drive System
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.
Description : Advantages of Variable Frequency Drive (VFD)
Answer :
Advantages of Variable Frequency Drive (VFD)
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.
asked
Mar 10, 2018
by
anonymous
Description : What is a digital power meter?
asked
Mar 10, 2018
by
anonymous
Description : What is a power quality analyzer?
asked
Mar 10, 2018
by
anonymous
Description : What is the use of power factor correction?
asked
Mar 10, 2018
by
anonymous
Description : What is the best power factor?
Answer :
It is unity power factor but difficult to achieve in dynamic loads
asked
Mar 10, 2018
by
anonymous
Description : What is power factor angle?
asked
Mar 10, 2018
by
anonymous
Description : What is an RF Power Meter?
asked
Mar 10, 2018
by
anonymous
Description : What causes random power outages?
asked
Mar 10, 2018
by
anonymous
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
asked
Mar 10, 2018
by
anonymous
Description : Why do we need to correct power factor?
asked
Mar 10, 2018
by
anonymous
Description : What is power logger?
asked
Mar 10, 2018
by
anonymous
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
asked
Mar 10, 2018
by
anonymous
Description : What are the power quality disturbance?
asked
Mar 10, 2018
by
anonymous
Description : What is harmonic in power quality?
asked
Mar 10, 2018
by
anonymous
Description : What is power quality meter?
asked
Mar 10, 2018
by
anonymous
Description : What are the different power quality issues?
asked
Mar 10, 2018
by
anonymous
Description : What is good power quality?
asked
Mar 10, 2018
by
anonymous
Description : What is power quality monitoring?
asked
Mar 10, 2018
by
anonymous
Description : How often do power surges occur?
asked
Mar 10, 2018
by
anonymous
Description : What is meant by power dip?
asked
Mar 10, 2018
by
anonymous