EE6701 High Voltage Engineering Important questions

EE6701 High Voltage Engineering Important questions Regulation 2013 Anna University free download. EE6701 Important questions High Voltage Engineering free pdf download.

Sample EE6701 High Voltage Engineering Important questions:

1. Write some applications of high voltage?

Cathode ray tubes, particle accelerators, Xerography, Electrostatic precipitators,
Nuclear Research

(ee6701 high voltage engineering important questions)

2. What are the causes of over voltages in a power system?

Lightning and Switching surges are the causes of overvoltages.

3. What are the theories associated with the formation of charges in clouds?

• Simpson’s theory
• Reynold’s and mason’s theory

4. What are the types of lightning strokes

• Direct stroke
• Indirect stroke

(ee6701 high voltage engineering important questions)

5. What are the sources of switching surges?

• De-energizing of the lines, cables and shunt capacitors
• Disconnection of unloaded transformers and reactors
• Opening and closing of the protective devices
• Arcing ground

6. What are the factors to be considered for switching over voltages in EHV and UHV system?

• Interruption of low inductive currents by high speed circuit breakers
• Ferro resonance condition
• Interruption of fault current when the fault is cleared

(ee6701 high voltage engineering important questions)

7. What are the methods to control overvoltage due to switching and power frequency?

• One or multi-step energization of lines by inserting resistors.
• Phase controlled closing of Circuit breakers with proper sensors.
• Drain the trapped charges before reclosing the lines
• Using shunt reactors
• By using lightning arrestors or surge arrestors.

8. Write the causes of power frequency overvoltages.

• Sudden load rejection
• Disconnection of inductive and capacitive loads
• Ferranti effect
• Saturation in transformers
• Tap changing operation (ee6701 high voltage engineering important questions)

9. What are the various methods of protecting the power system from lightning?

• Using Ground wires
• Using ground rods
• Using counter poise wires
• Using protective devices like rod gap, expulsion and valve type surge arrestors.

10. What are the uses of ground wires?

It is used for direct stroke protection of lines for voltages of 110 kv and above and from attenuation of travelling waves in the line.

(ee6701 high voltage engineering important questions)

Subject Name	High Voltage Engineering
Subject Code	EE6701
Regulation	2013

EE6701 High Voltage Engineering Important questions click here to download

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IC6501 Control Systems Important questions

IC6501 Control Systems Important questions Regulation 2013 Anna university free download. IC6501 Important questions Control Systems pdf free download.

Sample IC6501 Control Systems Important questions

1. What is control system? (April 2009)

A system consists of a number of components connected together to perform a specific function. In a system when the output quantity is controlled by varying the input quantity then the system is called control system.

2. What are the two major types of control system? (May 2007) IC6501 Control Systems Important questions

The two major types of control systems are
i. Open Loop Control System
ii. Closed Loop Control System

3. Define open loop control system. (April 2005)

The control system in which the output quantity has no effect upon the input quantity is called open loop control system. This means that the output is not feedback to the input for correction.

4. Define closed loop control system. (May 2006) IC6501 Control Systems Important questions

The control system in which the output has an effect upon the input quantity so as to maintain the desired output value is called closed loop control system.

5. What are the components of feedback control system? (Dec 2006)

The components of feedback control system are plant, feedback path elements, error detector and controller.

7. What are the basic elements used for modeling mechanical translational system?(May 2007) IC6501 Control Systems Important questions

The model of mechanical translational systems can be obtained by using three basic elements mass, spring, and dash -pot. These three elements represent three essential phenomena which occur in various ways in mechanical systems.

The weight of the mechanical system is represented by the element mass and it is assumed to be concentrated at the centre of the body. The elastic deformation of the body can be represented by a spring. The friction existing in mechanical system can be represented by the dash – pot. The dash – pot is a piston
moving inside a cylinder filled with viscous fluid. IC6501 Control Systems Important questions

Subject Name	Control Systems
Subject Code	IC6501
Regulation	2013
File	PDF

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EE6504 Electrical Machines 2 Important questions

EE6504 Electrical Machines 2 Important questions Regulation 2013 Anna University free download. EE6504 Important questions Electrical Machines 2 pdf free download.

Sample EE6504 Electrical Machines 2 Important questions:

1. What are the conditions for parallel operation of an alternator? [Nov/ Dec 2009], [June/July 2009]

i. The terminal voltage of the incoming alternator must be the same as that of bus bars.
ii. The frequency of incoming alternator must be same as that of bus bars.
iii. The phase sequence of the incoming machine voltage must be same as that of bus bar voltage .

2. Why is EMF method called pessimistic method? [Apr/ May 2007]

The value of voltage regulation obtained by emf method is always more than the actual value and therefore it is called pessimistic method. (EE6504 Electrical Machines 2 Important questions)

3. What are the causes of changes in voltage of alternators when loaded? [Apr/ May 2006] [Nov/ Dec 2011]

i. Voltage drop due to resistance of winding
ii. Voltage drop due to leakage reactance
iii. Voltage drop due to armature reaction

4. Write down the equation for frequency of emf induced in an Altenator. [June/July 2009]
Frequency of emf induced in an Alternator,(f) ,expressed in cycles per second or Hz, is given by the following equation f = (PN)/120: Hz, Where P- Number of poles N-Speed in rpm.

5. What is the purpose of conducting slip test? [Nov/ Dec 2009]
The slip test is performed on an alternator to determine Xd and Xq. (EE6504 Electrical Machines 2 Important questions)

6. Two reaction theory is applied only to salient pole machines. State the reasons. [Nov/ Dec 2007]
A multipolar machine with cylindrical rotor has a uniform airgap and therefore, its reactance remains the same, irrespective of the special positions of the rotor but in case of salient pole machines, the airgap is not uniform and its reactance varies with the rotor positions. Because of nonunifomity of the reluctance of the
magnetic paths, the mmf of the armature is divided into two components viz, (i) one component is located along the axis of salient pole rotor known as direct axis component. (ii) the other component is located perpendicular to the axis of salient pole rotor known as quadrature axis component. This makes the concept of
two reaction theory. (EE6504 Electrical Machines 2 Important questions)

Subject Name	Electrical Machines 2
Subject Code	EE6504
Regulation	2013
File	PDF

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