EE2352 Solid State Drives B.E Question Bank : selvamtech.com

Name of the College : Selvam College of Technology
Subject Code/Name : EE2352-Solid State Drives
Dept : Electrical And Electronics Engineering
Degree : B.E
Year: : III/VI
Website : selvamtech.com
Document Type : Question Bank

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Selvam Tech Solid State Drives  Model Paper

UNIT-I
DRIVE CHARACTERISTICS :
1. What is meant by electrical drives?
Systems employed for motion control are called drives and they employ any of the prime movers such as diesel or petrol engines, gas or steam turbines, hydraulic motors and electric motors for supplying mathematical energy for motion control. Drives employing electric motion are called electric drives.

Related : Selvam College of Technology Alternative Energy Sources B.E Question Bank :  www.pdfquestion.in/3244.html

2. What are the requirements of an electric drive?
Stable operation should be assured. The drive should have good transient response
3. Specify the functions of power modulator.
Power modulator performs one or more of the following four functions.
a. Modulates flow of power form the source to the motor in such a manner that motor is imparted speed-torque characteristics required by the load.
b. During transient operations, such as starting, braking and speed reversal, it restricts source and motor currents within permissible values; excessive current drawn from source may overload it or may cause a voltage dip.

4. Mention the different types of drives.
1) Group drive
2) Individual drive
3) Multi motor drive
5. List the different types of electrical drives.
1) dc drives
2) ac drives
6. What are the advantages of electric drives?
They have flexible control characteristics. the steady state and dynamic characteristics of electrical drives can be shaped to satisfy load requirements.
1) Drives can be provided with automatic fault detection systems, programmable logic controllers and computers can be employed to automatically ctrl the drive operations in a desired sequence.
2) They are available in which range of torque, speed and power.
3) It can operate in all the four quadrants of speed-torque plane. Electric braking gives smooth deceleration and increases life of the equipment compared to other forms of braking.
4) Control gear required for speed control, starting and braking is usually simple and easy to operate.
7. What are the functions performed by electric drives?
Various functions performed by electric drives include the following.
a. Driving fans, ventilators, compressors and pumps etc.
b. Lifting goods by hoists and cranes
c. Imparting motion to conveyors in factories, mines and warehouses and
d. Running excavators and escalators, electric locomotives, trains, cars, trolley buses, lifts and drums winders etc.
8. What are the disadvantages of electric drives?
The disadvantages of electric drives are
a. Electric drives system is tied only up to the electrified area.
b. The condition arising under the short circuits, leakage from conductors and breakdown of overhead conductor may lead to fatal accidents.
c. Failure in supply for a few minutes may paralyses the whole system.
9. What are the advantages of group drive over individual drive?
The advantages of group drive over individual drive are
a. Initial cost: Initial cost of group drive is less as compared to that of the individual drive.
b. Sequence of operation: Group drive system is useful because all the operations are stopped simultaneously.
c. Space requirement: Less space is required in group drive as compared to individual drive.
d. Low maintenance cost: It requires little maintenance as compared to individual drive.
10. What the group drive is not used extensively.
Although the initial cost of group drive is less but yet this system is not used extensively because of following disadvantages.
a. Power factor: Group drive has low power factor
b. Efficiency: Group drive system when used and if all the machines are not working together the main motor shall work at very much reduced load.
c. Reliability: In group drive if the main motor fails whole industry will come to stand still.
d. Flexibility: Such arrangement is not possible in group drive i.e., this arrangement is not suitable for the place where flexibility is the prime factor.
e. Speed: Group drive does not provide constant speed.
f. Types of machines: Group drive is not suitable fro driving heavy machines such as cranes, lifts and hoists etc.