Solid State Drives Question Bank
SOLID STATE DRIVES QUESTION BANK
UNIT
– I
DRIVES
CHARACTERISTICS
PART A
1. Write down the components of
load torque? [A/M 2011]
2. What are the three
modes of drive operations? [A/M 2010, 2014]
3. Write down
the fundamental torque equation of motor load
system?
[N/D 2011]
4. What are the factors that govern the choice of an electric drives?
[N/D 2010]
5. What is meant dynamic
torque? [A/M 2010]
6. Define active and passive load torque. [N/D 2009]
7. What is meant by electrical drives?
[N/D 2014]
8. What is regenerative braking?
[N/D 2014]
9. State
the condition for steady state stability of motor load system..[ M/J 2014]
10. What are the disadvantages of DC motors
when compressed to AC motors?
11. When
does an equilibrium point be stable in speed-torque plane of motor-load
system.[N/D 2014]
12. Mention the necessary
conditions to obtain the three modes of operation of an electric drive? [N/D 2008]
13. What are the types of
electric braking ? Is braking applicable for
any type of motor? [N/D 2008]
14. How are
loads classified? [N/D 2011]
15. What is meant by acceleration mode
of an electric drove? [A/M
2008]
16. What is multi quadrant dynamics in drive
characteristics? [A/M 2008 ]
17.
Give the classification of electric
drives. [A/M 2010]
18. What are the advantages solid state drives?
[N/D 2008]
19.What are the factors that govern the choice of an
electric motor to be used as a drive element ?[A/M 2008]
20. State the requirements
of an adjustable speed drive? [ N/D 2014]
PART
B
1. State the essential part of an electrical drive.What are the functions of each component [A/M2013]
2. Derive and
describe the equations governing motor load dynamics:- [, A/M 2014]
3. Explain in detail about steady state stability of equilibrium point in
Electrical drive . Also derive the condition for steady
state stability of equilibrium point [A/M 2011M/J’10, M/J’9 N/D’09, N/D’10,N/D’11]
4. Explain in detail about four quadrant operation of a hoist load [A/M 2013]
5. Expression for
equivalent load torque and equivalent inertia of loads in translation and Rotational motion. [A/M 2014]
6. (a)Draw
and Describe the typical load-torque characteristics of electrical drive .(8)
(b)Classify the electrical loads according to the Speed-Torque
characteristics and explain with examples.[A/M 2011,N/D’09,N/D’10, M/J’10,M/J’12](8)
7. What are
the main factors which decide the choice of electrical drive for a given applications?
[A/M
2010]
UNIT –II
CONVERTER / CHOPPER FED DC MOTOR DRIVE
PART A
1.
List out the drawbacks of AC-DC converter fed DC drive? [A/M 2011]
2.
What is TRC scheme? [A/M 2011]
3.
What are the merits for four quadrant operation of a converter? [N/D 2011]
4.
Define current limit control of a chopper fed DC drives? [A/M 2013]
5.
What is the difference between continuous
and discontinuous conduction
mode?
6.
What are the advantages of chopper fed dc drives? [A/M 2014]
7. Write down
the speed-torque relation for single phase fully controlled converter fed dc
motor in continuous conduction mode? [M/J 2014]
8.
Write down the control strategies of chopper? [M/J 2014]
9.
Write the expression for the average output voltage of full converter fed dc
drive? [A/M 2008]
10.
What are applications of chopper fed dc drives? [M/J 2012]
11.
What are the advantages in operating choppers at higher frequency?
12.
Write down the speed torque equation of dc separately excited motor fed
drive?[A/M 2014]
13.
What is time ratio control? [N/D 2010]
14.
How is continuous conduction mode of the motor drive obtained?
15.
What is meant by multi-quadrant operation of dc motor?
16.What
is the discontinuous conduction mode of a separately excited dc motor drive? [A/M
2010]
17. Why does the
armature voltage control is not preferred for the speeds above the rated value
in
dc motors? [A/M 2010
18.
What is the necessity of controlled converter for a dc drive? [A/M 2013]
19.
What is the necessity of dc choke coil and free wheeling diode in a converter
circuit? [A/M 2013]
20.what
are the two types of current controllers used in motor drive system? [CO2- L1,
A/M 2007]
PART B
1. Explain in detail the operation and steady state analysis of 1 ø fully
controlled converter fed separately excited dc motor drive in
continuous and discontinuous conduction mode [CO2-H1 M/J’13, M/J’12,
M/J’11, N/D’10, M/J’10, N/D’09, M/J’09]
2. Explain with a circuit diagram and waveforms the operation of a 3ø
fully controlled converter fed separately excited DC motor
Three phase controlled Rectifies fed DC drives: [A/M 2015]
3. Explain the different Control strategies of chopper. [A/M 2014]
4. Explain four quadrant operation of chopper in detail. [N/D 2014]
5. A 1 ø fully controlled thyristor bridge converter,
operating from 230V, 50Hz main supplies the armature of a separately
excited dc motor running at a speed of 1000rpm. The motor has an armature resistance of 0.5 Ω
and a back emf constant of 0.1V/rpm. Assuming continuous conduction current operation
for a firing angle 30°.Estimate the average armature current and torque developed by the motor.
6. A 220V, 1500rpm, 10A separately excited dc motor has an armature
resistance of 10 Ω. It is fed from a single phase fully
controlled bridge rectified with an ac source voltage of 230V at 50Hz. Assuming continuous load
current compute i) motor speed at a firing angle of 30° and torque of 5Nm, ii) developed torque at
the firing angle of 45° and speed of 1000rpm
UNIT III
INDUCTION MOTOR DRIVES
PART
A
1. What are applications induction drives? [A/M
2007]
2. What is slip power recovery scheme? [A/M 2009]
3. What is
super synchronous operation? [A/M 2013]
4. Define slip power [N/D 2008]
5. State the application of induction motor drives
controlled by AC voltages controllers? [A/M 2007]
6. Write down the consequences of
increasing the frequency of induction motor without a change in the terminal voltage? [A/M
2013]
7. What are the three regions in the speed-torque
characteristics of the induction motor? [A/M 2007]
8. Why is the speed control of a 3 induction motor with constant supply
voltage and reduced supply frequency not preferred? [A/M
2009]
9. Mention the different methods of speed control of
induction motor drive? [CO3- L1, N/D 2009]
10. What are the disadvantages of static rotor
resistance control? [A/M 2009]
11. Why is stator voltage control preferred for fan
and pump drives? [N/D2012]
12. Compare static Kramer and scherbius system? [N/D
2012]
13. What are the advantages of vector control
technique? [A/M 2014]
14.Mentions
the merits and demerits of stator voltage control? [A/M 2014]
15.What are the drawbacks of stator voltage control
method?[A/M 2013]
16.What are the advantages of vector control
technique? [A/M 2014]
17.Compare CSI fed drives and VSI fed drives? [A/M
2014]
18.Define vector control? [A/M 2008
19.What are the various application of stator
voltage control scheme? [N/D 2008]
PART B
1. Explain stator voltage control of induction motor
drives[A/M 2013]
2. Explain with a neat diagram the field weakening
mode control of induction motor drives [N/D 2014]
3.Explain in detail, the Voltage / frequency control
(or) V/f control: [A/M 2011]
4.Explain the drive strategy for constant air – gap
slip – speed controlled induction motor. [N/D 2010]
5.with neat sketch ,explain the Constant air gap
flux control: [CO3-L2, A/M 2013]
UNIT- IV
PART A
SYNCHRONOUS MOTOR DRIVES
1. What are the different modes employed to achieve variable frequency
control in synchronous motors? [A/M 2014 N/D2008]
2. When
can a synchronous motor be load commutated? [A/M 2008]
3. When is a synchronous motor said to be self
controlled? [M/J 2013]
4. What are the advantages of PMSM? [A/M 2013]
5. Mention the different types of PMSM? [N/D 2012]
6. Why self controlled synchronous motor is free
from hunting operation? [A/M 2015]
7. What is meant by field weakening mode control for
drives? [A/M 2007]
8. What is the necessity of delay unit in a open
loop v/f control of synchronous
motor? [N/D 2011]
9. Define self control mode of synchronous motor?
[A/M 2015]
10. What are the characteristics of self controlled
mode operated synchronous motor? [A/M 2014]
11. Write down the torque equation of synchronous
motor? [A/M 2011]
12. What is meant by margin angle of commutation in
the control of synchronous motors?
13. What is meant by commutator less dc motor? [N/D
2014]
14. State advantages of permanent magnet synchronous
motors? [A/M 2010]
15. What are the different modes of control that
exist in a synchronous motor on a variable frequency supply?
[N/D 2008]
16.Write any 2 advantages of self-control technique?
[A/M 2007]
17.What do you mean by brushless excitation? [A/M
2009]
18.Write any 2 application of synchronous motor
drives? [N/D 2009]
19.Mention some application of cycloconverter fed
synchronous motor drive?
[N/D 2013]
20.Give the application of self controlled
synchronous motor? [N/D 2013]
21.Write any four special features of
self-controlled synchronous machine? [A/M 2014]
22.Mention the different type of synchronous motors?
[A/M 2010]
PART B
1.Explain self controlled synchronous motor drive employing load commutated thyristor inverter? [a/m 2013]
2. Constant marginal angle control[a/m 2014]
3. Explain power factor control of synchronous motor drives [, a/m 2013]
Unit -V
Design of controllers for Drives
Part - A
1. write the transfer function of converter? [a/m 2011]
4. Write any 2 advantages of closed loop control system? [A/M 2010]
5. what is mechanical time constant of d.c ,machines? [A/M 2012
8. what is field weakening mode control? [A/M 2013]
9. write down the advantage of PI controller? [A/M 2015]
10. Mention the types of current controllers is drive system? [A/M 2008] p-
11. Give any four factors to be considered for the selection of controller?
[N/D 2008]
12. Give the transfer function relating speed and armature current of a dc
motor? [A/M 2008]
16. state the methods of speed sensing? [A/M 2010]
PART B
1. From basic principle derives the transfer function for separately excited
dc motor load system. [CO5-H1APR/MAY2015)
3. Closed loop control of Electric Drive: [A/M 2009]
4. Explain the design procedure of speed controller with inner current
controller of a separately excited DC motor drive. [MAY/JUNE 2014]
5. Explain the closed loop speed control for armature voltage control and
field weakening mode for a dc drive. [A/M 2015]
6. Give the design procedure for speed controller of an electrical drive
system.[A/M 2013]
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