EE6801 Electric Energy Generation Utilization and Conservation Important questions

EE6801 Electric Energy Generation Utilization and Conservation Important questions Regulation 2013 Anna University free download. Electric Energy Generation Utilization and Conservation EE6801 Important questions pdf free download.

Sample EE6801 Electric Energy Generation Utilization and Conservation Important questions:

1. List out the advantages of nuclear power station over thermal power station
 The amount of fuel required is very small
 There is no problem of transportation and storage less space is required
 Most economical (EE6801 Important questions)

2. Name the sub system of solar power plant
 Solar energy collection system
 Thermal energy transfer system
 Thermal energy storage system
 Energy conversion system (EE6801 Important questions)

3. Indicate the difficulties using geo thermal energy
 Overall efficiency of power production is low
 Drilling operation is noisy
 Large areas are needed for exploitation of geo thermal energy

4. State the advantages of interconnected operation of power system
 Increased reliability of supply
 The event of power failure at one station the supply can be fed from other station
 Reduction total installed capacity
 Spinning reserve is reduced (EE6801 Important questions)

5. State the advantage of MHD
 Conversion efficiency is around 50%
 The closed cycle supply produces power, free of pollution
 It has no moving parts, so more reliable

6. What are the major components of nuclear power?
 Nuclear reactor
 Heat exchanger
 Steam turbine
 Alternator (EE6801 Important questions)

Subject Name	Electric Energy Generation Utilization and Conservation
Subject Code	EE6801
Regulation	2013

EE6801 Electric Energy Generation Utilization and Conservation Important questions click here to download

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EE6703 Special Electrical Machines Important questions

EE6703 Special Electrical Machines Important questions Regulation 2013 Anna University free download. Special Electrical Machines EE6703 Important questions free pdf download.

Sample EE6703 Special Electrical Machines Important questions:

1. What is synchronous reluctance motor?

 A reluctance motor is a type of synchronous electric motor which induces nonpermanent magnetic poles on the ferromagnetic rotor. Torque is generated through the phenomenon of magnetic reluctance.

 The stator consists of multiple salient (ie. projecting) electromagnet poles, similar to a wound field brushed DC motor. The rotor consists of soft magnetic material, such as laminated silicon steel, which has multiple projections acting as salient magnetic poles through magnetic reluctance. EE6703 Special Electrical Machines Important questions

 The number of rotor poles is typically less than the number of stator poles, which minimizes torque ripple and prevents the poles from all aligning simultaneously — a position which can not generate torque.

2. Define the characteristics of synchronous reluctance motor.

The synchronous reluctance motor is not self starting without the squirrel cage. During run up it behaves as an induction motor but as it approaches synchronous speed, the reluctance torque takes over and the motor locks into synchronous speed.

3. Write the applications of syrm.

Used where regulated speed control is required in applications suc as metering pumps and industrial process equipment. (EE6703 Special Electrical Machines Important questions)

4. What are the classification of syrm

 Axially laminated
 Radially laminated

5. What are the primary design consideration of syrm?

 High o/p power capability
 Ability of the rotor to withstand high speed.
 High reliability
 Low cost
 High efficiency

6. Define power factor of syrm

PF max=(Ld/Lq-1)/(Ld/Lq+1)
Higher Ld/Lq ratos yield higher power factors,which corresponds to reduced I^2R losses and reduce volt ampere ratings of the inverter driving the machine. (EE6703 Special Electrical Machines Important questions)

7. What are the applications of the torque – speed characteristics of syrm?

 Comparable power density but better efficiency than induction motor
 Slightly lower power factor
 Sensorless control is much easier due to motor saliency.

(EE6703 Special Electrical Machines Important questions)

Subject Name	Special Electrical Machines
Subject Code	EE6703
Regulation	2013

EE6703 Special Electrical Machines Important questions click here to download

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EE6702 Protection and Switchgear Important questions

EE6702 Protection and Switchgear Important questions Regulation 2013 Anna University free download. EE6702 Important questions Protection and Switchgear pdf free download.

Sample EE6702 Protection and Switchgear Important questions:

1. What are the functions of protective relays

To detect the fault and initiate the operation of the circuit breaker to isolate the
defective element from the rest of the system, thereby protecting the system from damages consequent to the fault.

2. Give the consequences of short circuit. (EE6702 Protection and Switchgear Important questions)

Whenever a short-circuit occurs, the current flowing through the coil increases to an enormous value. If protective relays are present , a heavy current also flows through the relay coil, causing it to operate by closing its contacts.The trip circuit is then closed , thecircuit breaker opens and the fault is isolated from the rest of the system. Also, a low voltage may be created which may damage systems connected to the supply.

3. Define protected zone. ()

Are those which are directly protected by a protective system such as relays, fuses or switchgears.If a fault occurring in a zone can be immediately detected and or isolated by a protection scheme dedicated to that particular zone.

4. What are unit system and non unit system? (EE6702 Protection and Switchgear Important questions)

A unit protective system is one in which only faults occurring within its protected
zone are isolated.Faults occurring elsewhere in the system have no influence on the operation of a unit system.A non unit system is a protective system which is activated even when the faults are external to its protected zone.

5. What is primary protection?

Is the protection in which the fault occurring in a line will be cleared by its own
relay and circuit breaker.It serves as the first line of defence.

6. What is back up protection? (EE6702 Protection and Switchgear Important questions)

Is the second line of defence , which operates if the primary protection fails to
activate within a definite time delay.

7. Name the different kinds of over current relays.

Induction type non-directional over current relay,Induction type directional over current relay & current differential relay.

8. Define energizing quantity.

It refers to the current or voltage which is used to activate the relay into operation.

9. Define operating time of a relay. (EE6702 Protection and Switchgear Important questions)

It is defined as the time period extendind from the occurrence of the fault through
the relay detecting the fault to the operation of the relay.

10. Define resetting time of a relay.

It is defined as the time taken by the relay from the instant of isolating the fault to
the moment when the fault is removed and the relay can be reset.

EE6702 Protection and Switchgear Important questions

Subject Name	Protection and Switchgear
Subject Code	EE6702
Regulation	2013

EE6702 Protection and Switchgear Important questions click here to download

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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

IC6501 Control Systems Important questions click here to download

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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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EE6503 Power Electronics Important questions

EE6503 Power Electronics Important questions Regulation 2013 Anna University free download. EE6503 Important questions Power Electronics pdf free download.

Sample EE6503 Power Electronics Important questions:

1. What is power electronics?

Power electronics is a subject that concerns the applications electronics principles into situations that are rated at power level rather than signal level. It may be defined as a subject deals with the apparatus and equipment working on the principle of electronics but at rated power level.

2. Give the applications of power electronics.

 Aerospace
 Commercial
 Industrial
 Telecommunications (EE6503 Power Electronics Important questions)

3. Classify power semiconductor devices give examples.

 Diodes: power diodes
 Thyristors: SCR
 Control switches: BJT, MOSFET and IGBT

4. Define latching current of SCR. [Nov/Dec 2012] May/June 2014

The latching current is defined as the minimum value of anode current which it must attain during turn on process to maintain conduction when gate signal is removed.

5. What are the factors that influence the turn-off time of thyristor? [Nov/Dec 2010]
1. Recovery Process 2. Recombination Process

6. What are the parameters involved in switching loss of power device? [April/May 2011]

 Forward conduction loss
 Loss due to leakage current during forward and reverse blocking
 Switching losses at turn-on and turn-off.
 Gate triggering loss. (EE6503 Power Electronics Important questions)

7. What are the advantages of MOSFET?

 Lower switching losses.
 No Secondary breakdown.
 Switching frequency high.
 It has positive temperature coefficient for resistance.

8. Define the term pinch off voltage of MOSFET. [May/June 2012]

If the gate source voltage is made negative enough, the channel will be completely depleted, offering a high value of drain to source resistance and there will be no current flow from drain to source. The value of gate source voltage is called pinch off voltage. (EE6503 Power Electronics Important questions)

Subject Name	Power Electronics
Subject Code	EE6503
Regulation	2013
File	PDF

EE6503 Power Electronics Important questions click here to download

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EE6502 Microprocessors and Microcontrollers Important questions

EE6502 Microprocessors and Microcontrollers Important questions Regulation 2013 Anna University free download. EE6502 Important questions Microprocessors and Microcontrollers pdf free download.

Sample EE6502 Microprocessors and Microcontrollers Important questions:

1. What are the flags available in 8085 processor? (BT-1)

2. Explain the function of program counter in 8085 microprocessor. (BT-4)

3. Give the control and status signals of 8085 microprocessor and mention its need. (BT-2)

4. Explain the following signals of 8085: RST 7.5, READY. (BT-4)

5. Show the schematic to generate separate read/write control signals for memory and I/O related signals in 8085. (BT-3) (EE6502 Microprocessors and Microcontrollers Important questions)

6. Illustrate the functions of the two status signals S0 and S1 in 8085. (BT-3)

7. Specify the four control signals commonly used by the 8085 MPU. (BT-1)

8. What is stack and what is the function of stack pointer? (BT-1)

9. Give two applications of 8085. (BT-2) (EE6502 Microprocessors and Microcontrollers Important questions)

10. Calculate the execution time of an instruction MVI A,82H in 8085 runs at 2 MHz. (BT-3)

11. Give the various machine cycles of 8085. (BT-2)

12. If the memory address of the last location of a 1Kbyte memory chip is FBFFH, What is the starting address? (BT-6)

13. Differentiate I/O mapped I/O and Memory mapped I/O. (BT-4)

14. Draw the schematic of latching low-order address bus in 8085 microprocessor. (BT-2) (EE6502 Microprocessors and Microcontrollers Important questions)

15. What are the interrupts available in 8085? (BT-1)

16. Compare software and hardware interrupts. (BT-5)

17. Give the function of ALE signal in 8085 microprocessor. (BT-2)

18. Define polling. (BT-1) (EE6502 Microprocessors and Microcontrollers Important questions)

19. What is meant by level triggered input? Which of the interrupts in 8085 are level triggered? (BT-1)

20. Explain the function of keyboard interrupts. (BT-5)

Subject Name	Microprocessors and Microcontrollers
Subject Code	EE6502
Regulation	2013
File	PDF

EE6502 Microprocessors and Microcontrollers Important questions click here to download

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EE6501 Power System Analysis Important questions

EE6501 Power System Analysis Important questions Regulation 2013 Anna University free download. EE6501 Important questions Power System Analysis pdf free download.

Sample EE6501 Power System Analysis Important questions:

1. Explain the requirements of planning the operation of a power system.

Planning the operation of a power system requires load studies, fault calculations, the design of means for protecting the system against lightning and switching surges and
against short circuits, and studies of the stability of the system. (EE6501 Power System Analysis Important questions)

2. Define steady state operating condition.

A power system is said to be in a steady state operating condition, if all the measured(or calculated) physical quantities describing the operating condition of the
system can be considered constant for the purpose of analysis.

3. What is a disturbance and what are the two types of disturbances?

If a sudden change or sequence of changes occurs in one or more of the system parameters or one or more of its operating quantities, the system is said to have
undergone a disturbance from its steady state operating condition. The two types of disturbances in a power system are,
i) Large disturbance ii) Small disturbance (EE6501 Power System Analysis Important questions)

4. What is a small disturbance? Give example.

If the power system is operating in a steady state condition and it undergoes change, which can be properly analyzed by linearized versions of its dynamic and algebraic equations, a small disturbance is said to have occurred.
Example of small disturbance is a change in the gain of the automatic voltage regulator in the excitation system of a large generating unit.

5. What is a large disturbance? Give some examples.

A large disturbance is one for which the nonlinear equations describing the dynamics of the power system cannot be validly linearized for the purpose of analysis.
Examples of large disturbances are transmission system faults, sudden load changes, loss of generating units and line switching. (EE6501 Power System Analysis Important questions)

Subject Name	Power System Analysis
Subject Code	EE6501
Regulation	2013

EE6501 Power System Analysis Important questions Click here to download

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EE6303 Linear Integrated Circuits and Applications Important questions

EE6303 Linear Integrated Circuits and Applications Important questions regulation 2013 Anna University free download. EE6303 Important questions Linear Integrated Circuits and Applications LIC pdf free download.

Sample EE6303 Linear Integrated Circuits and Applications Important questions:

1. What are the advantages of polysilicon gate MOSFET over aluminum gate?

The silicon film is of high quality and suitable for IC manufacturing. SOI provides a speed advantage because the source/drain to body junction capacitance is practically eliminated because the junctions extend vertically to the buried oxide. The cost of a SOI wafer is many times higher than an ordinary silicon wafer and can increase the total Fabrication cost of IC chips by ~30%.

2. What are the two common methods for obtaining integrated capacitors?

 Monolithic junction capacitor
 Thin-flim capacitor (ee6303 linear integrated circuits and applications important questions)

3. What is the purpose of oxidation process in IC fabrication?(Apr 2010)

The silicon wafers are stacked up in a quartz boat & then inserted into quartz furnace tube. The Si wafers are raised to a high temperature in the range of 950 to 1150oC & at the same time, exposed to a gas containing O2 or H2O or both.
The chemical action is Si + 2H2O ——> Si O2+ 2H2

4. What is parasitic capacitance? (Apr 2010)

In electrical circuits, parasitic capacitance is an unavoidable and usually unwanted capacitance that exists between the parts of an electronic component or circuit simply because of their proximity to each other.

5. What is meant by ion implantation?(Nov 2011, Nov 2012)

The conductivity of the semiconductor increases when small impurity is added to it. The process of adding impurity is called doping while the impurity to de added is called dopant.so ion implantation is a process of adding dopant to the silicon substrate. The ion implantation process is controllable, reproducible and also there are no unwanted side effects. (ee6303 linear integrated circuits and applications important questions)

Subject Name	Linear Integrated Circuits and Applications
Subject code	EE6303
Regulation	2013

EE6303 Linear Integrated Circuits and Applications Important questions Click here to download

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