APCPDCL question paper 2010

Control system:

1.The overall transfer function of the system in the given figure is 

   2. velocity error can be find out by which signal…………..

3.Type-2 steady state error for step and ramp inputs ……… 
4.The unit impulse response of a unity feed back control system is given by .
The OLTF is…………


Power system:

1. Surge tank installed between………….&…………

2. bundle conductors are used for……………

3. over current relays are used to protect ……………

4. Peak load plant is ………..

5. Efficiency of modern thermal power plant is ……………

6. Find the impedance matrix…………

 

7.Find Y_{12………………………….}  

   8.Considering surge impedance voltage at the receiving end ……………….

       a)increases          b) decreases                 c)same

Network theory:

1. For the function shown in the fig. Fourier transform is ……………..
2. The laplace transform of cos(wt+pi)is ………….
3. The response of unit ramp function when integrated…………..
4. The equivalent capacitance across ab will   be   ……………

        5.The time constant of the network shown in fig………………….

6   Two R’s connected in parallel gives 4ohms, one R shortcircuit gives equivalent R is 6   ohms. The other R is …………..

7.      R=?

8.      The circuit resonates at…………………

9.      The impedance of the ladder network………………

10. At max power the value of  R

Machines :

1. Which type of single phase motor will have high starting torque……………

2. Shaded pole IM doesn’t have the advantage of …………………..

3. Speed- Time char’s of IM……………..
4. A 20kva single phase transformer has efficiency of 98% at FL and also at half load. The pf is unity in both the cases. W_i=?, W_cu=? 
5. To avoid humming in transformer………………….

Analog and Digital:

1. The table shows …………..

    a)OR                    b)EX-OR          c)EX-NOR          d)NOR

0	1	1
1	0	1
0	0	0
1	1	0

2. Zener diode used as………….

3. IGBT is the combination of ……………

4. Ideal vaule of CMRR…………..

5. SCR is the combination of …………………transistors.

6. Amplifier output phase shift ………….­^o       

7. FET can be used as…………..

 

^{Instrumentation}

^{1.      In Anderson bridge inductance can be expressed interms of ………………..}

^{2.      Integrating type instrument……………..}

^{3.      strain guage transducer…………….transducer for measurement of …………….}

^{4.      Energy meter operated at steady state when…………..}

^{5.      LVDT is a…………….}

^{6.      integrated digital voltmeter reads...............value}

Utilization

1. To weld the thickness of material …………….
2. A prob on trapezoidal speed time curve to find out the distance………
3. Kando system is…………….