What are electronic devices and components?

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What is the effect of removal of bypass capacitor in a ce amplifier circuit?

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What is the basis for classifying a material as a conductor, semiconductor, or a dielectric?

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• Tell me a bit about the capabilities of Exchange Server. • What are the different Exchange 2003 versions? • What's the main differences between Exchange 5.5 and Exchange 2000/2003? • What are the major network infrastructure for installing Exchange 2003? • What is the latest Exchange 2003 Service Pack? Name a few changes in functionality in that SP. • What are the disk considerations when installing Exchange (RAID types, locations and so on). • You got a new HP DL380 (2U) server, dual Xeon, 4GB of RAM, 7 SAS disks, 64-bit. What do you do next to install Exchange 2003? (you have AD in place) • Why not install Exchange on the same machine as a DC? • Are there any other installation considerations? • How would you prepare the AD Schema in advance before installing Exchange? • What type or permissions do you need in order to install the first Exchange server in a forest? In a domain? • How would you verify that the schema was in fact updated? • What type of memory optimization changes could you do for Exchange 2003? • How would you check your Exchange configuration settings to see if they're right? • What are the Exchange management tools? How and where can you install them? • What types of permissions are configurable for Exchange? • How can you grant access for an administrator to access all mailboxes on a specific server? • What is the Send As permission? • What other management tools are used to manage and control Exchange 2003? Name the tools you'd use. • What are Exchange Recipient types? Name 5. • You created a mailbox for a user, yet the mailbox does not appear in ESM. Why? • You wanted to change mailbox access permissions for a mailbox, yet you see the SELF permission alone on the permissions list. Why? • What are Query Based Distribution groups? • What type of groups would you use when configuring distribution groups in a multiple domain forest? • Name a few configuration options for Exchange recipients. • What's the difference between Exchange 2003 Std. and Ent. editions when related to storage options and size? • Name a few configuration options related to mailbox stores. • What are System Public Folders? Where would you find them? • How would you plan and configure Public Folder redundancy? • How can you immediately stop PF replication? • How can you prevent PF referral across slow WAN links? • What types of PF management tools might you use? • What are the differences between administrative permissions and client permissions in PF? • How can you configure PF replication from the command prompt in Exchange 2003? • What are the message hygiene options you can use natively in Exchange 2003? • What are the configuration options in IMF? • What are virtual servers? When would you use more than one? • Name some of the SMTP Virtual Server configuration options. • What is a Mail Relay? Name a few known mail relay software or hardware options. • What is a Smart Host? Where would you configure it? • What are Routing Groups? When would you use them? • What are the types of Connectors you can use in Exchange? • What is the cost option in Exchange connectors? • What is the Link State Table? How would you view it? • How would you configure mail transfer security between 2 routing groups? • What is the Routing Group Master? Who holds that role? • Explain the configuration steps required to allow Exchange 2003 to send and receive email from the Internet (consider a one-site multiple server scenario). • What is DS2MB? • What is Forms Based Authentication? • How would you configure OWA's settings on an Exchange server? • What is DSACCESS? • What are Recipient Policies? • How would you work with multiple recipient policies? • What is the "issue" with trying to remove email addresses added by recipient policies? How would you fix that? • What is the RUS? • When would you need to manually create additional RUS? • What are Address Lists? • How would you modify the filter properties of one of the default address lists? • How can you create multiple GALs and allow the users to only see the one related to them? • What is a Front End server? In what scenarios would you use one? • What type of authentication is used on the front end servers? • When would you use NLB? • How would you achieve incoming mail redundancy? • What are the 4 types of Exchange backups? • What is the Dial-Tone server scenario? • When would you use offline backup? • How do you re-install Exchange on a server that has crashed but with AD intact? • What is the dumpster? • What are the e00xxxxx.log files? • What is the e00.chk file? • What is circular logging? When would you use it? • What's the difference between online and offline defrag? • How would you know if it is time to perform an offline defrag of your Exchange stores? • How would you plan for, and perform the offline defrag? • What is the eseutil command? • What is the isinteg command? • How would you monitor Exchange's services and performance? Name 2 or 3 options. • Name all the client connection options in Exchange 2003. • What is Direct Push? What are the requirements to run it? • How would you remote wipe a PPC? • What are the issues with connecting Outlook from a remote computer to your mailbox? • How would you solve those issues? Name 2 or 3 methods • What is RPC over HTTP? What are the requirements to run it? • What is Cached Mode in OL2003/2007? • What are the benefits and "issues" when using cached mode? How would you tackle those issues? • What is S/MIME? What are the usage scenarios for S/MIME? • What are the IPSec usage scenarios for Exchange 2003? • How do you enable SSL on OWA? • What are the considerations for obtaining a digital certificate for SSL on Exchange? • Name a few 3rd-party CAs. • What do you need to consider when using a client- type AV software on an Exchange server? What are the different clustering options in Exchange 2003? Which one would you choose

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differnce between timer & counter

5 Answers   TCS,

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What are different categories of antenna?

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hi friends. what type of question they wil ask in technical and HR i m ECE student............

0 Answers   Bosch,

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what is final value theorem ?

2 Answers   DVC,

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Explain about diode in a brief manner..

4 Answers   Toshiba,

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can any one say what are the non-scientific calculators?..i use casio ms350...wtr it is a scientific or non-scientific....

1 Answers   Microtek,

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Sunday, April 25, 2010 BSNL TTA EXAM Control Systems BSNL TTA EXAM Control Systems 1. An open loop control system has its (a) control action independent of the output or desired quantity (b) controlling action, depending upon human judgment (c) internal system changes automatically taken care of  (d) both (a) and (b) (e) all (a),(b) and (c) 2. A servo system must have (a) feedback system (b) power amplifier to amplify error (c) capacity to control position or its derivative  (d) all of these (e) none of these 3. The major disadvantage of a feedback system may be  Inaccuracy (b) inefficiency (c) Unreliability (d) instability (e) Insensitivity 4. Properties of a transfer function (a) It is ratio of two polynomials is S and assumes zero initial conditions (b) It depends on system elements and not input and output of the system (c) Coefficients of the powers of S in denominator and numerator are all real constant. The order of denominator is usually greater than or equal to the order of numerator (d) All of these (e) It is a function which transfer one physical system into another physical system. 5. The classical analogous of a simple lever is (a) Capacitor bridge (b) transformer (c) mutual inductor (d) either of these 6. Two blocks G1(s) and G2(s) can be cascaded to get resultant transfer function as (a) G1(s) + G2(s) (b) G1(s) / G2(s) (c) G1(s) G2(s) (d) 1+G1(s) G2(s) (e) 1-G1(s)G2(s) (f) two blocks cannot be cascade 7. The principles of homogeneity and super position can be applied to  linear time invariant system (b) non-linear time invariant system (c) digital control system (d) both (a) and (b) 8. Pick up the nonlinear system (a) automatic voltage regulator (b) d.c. servomotor with high field excitation (c) temperature control of a furnaces using thermistor (d) speed control using SCR (e) all of these 9. Signal flow graph (SFG) is a (a) polar graph (b) semi log graph (c) log log graph  (d) a special type of graph for analyzing modem control system (e) a topological representation of a set of differential equations 10. Disadvantages of magnetic amplifier (a) time lag, less flexible, non-sinusoidal waveform (b) low power consumption and isolation of the active circuit (c) saturation of the core (d) all of these 11. Pick up false statement regarding magnetic amplifiers (a) The gate coil of an ideal magnetic amplifier has either zero or infinite inductance (b) Resistance of control and gate winding is very small (c) Magnetic amplifier gas dropping load characteristics (d) Magnetic amplifiers are not used to control the speed of d.c. shunt motor (e) Magnetic amplifiers can be used in automatic control of electric drivers of higher rating. 12. High power amplification is achieved by using (a) push pull amplifier (b) amplidyne (c) magnetic amplifier (d) DC amplifier (e) D.C. generator 13. Pick up false statement regarding servomotors (a) The d.c. servomotors are lighter than equivalent a.c. servomotors (b) The d.c. servomotors develops higher starting and reversing torque than equivalent a.c. servomotor. (c) A drag cup a.c. servomotor has one windings on stator and other on rotor (d) Output power of servomotors varies from 1/20 W to 100 W 14. To reduce steady state error (a) decrease natural frequency (b) decrease damping (c) increase damped frequency (d) increase time constant (f) increase gain constant of the system 15. A good factor for Mp should be (a) less than 1 (b) lying between 1.1 and 1.5 (c) more than 2.2 (d) zero (e) infinity 16. Pick up false statement. Routh-Hurwitz criterion (a) is used for determining stability of a system (b) is an algebraic procedure (c) gives the exact location of roots of the characteristic equation (d) does not indicate relative degree of stability or instability 17. Which of the following is the time domain method of determining stability of a control system (a) Bode plot (b) Nyquist plot (c) Nicholos chart (d) Routh-Hurwitz array (e) Constant M and (fy) locus (f) Root locus technique 18. The technique which gives transient response quickly as well as stability information is (a) Nyquist plot (b) Routh-Hurwitz criteria (c) Bode plot (d) Root locus plot (e) Nichols plot 19. The bandwidth can be increased by use of (a) phase lag network (b) phase lead network (c) both (a) and (b) in cascade (d) both (a) and (b) in parallel (e) none of these 20. Nyquist plot is drawn on (a) semi log graph paper (b) log log graph paper (c) polar graph paper (d) centimeter graph paper 21. If the gain margin is positive and the phase margin is negative the system is (a) stable (b) unstable (c) indeterminist 22. The Bode plot is applicable to (a) all phase network (b) minimum phase network (c) maximum phase network (d) lag lead network (e) none of these 23. The valid relation between setting time ts and rise time tr is (a) tr>ts (b) ts>tr (c) ts=tr (d) none of these 24. As a root moves further away from imaginary axis the stability (a) increases (b) decreases (c) not affected (d) none of these 25. Flat frequency response means that the magnitude ratio of output to input over the bandwidth is (a) variable (b) zero (c) constant (d) none of above 26. How many octaves are between 200 Hz and 800 Hz (a) Two octave (b) One octave (c) Four octave (d) None of above 27. Human system can be considered as (a) open loop system (b) close loop system with single feedback (c) close loop system with multivariable feedback (d) none of these 28. In a feedback system the transient response (a) Decays at constant rate (b) gets magnified (c) decays slowly (d) decays more quickly 29. Transfer function of a system is used to calculate (a) the steady state gain (b) the main constant (c) the order of system (d) the output for any given input (e) all of the above 30. Transfer function of a system is defined as the ratio of output to input in (a) Laplace transform (b) Z-transform (c) Fourier transform (d) Simple algebraic form 31. Introduction of feedback decreases the effect of (a) disturbances (b) noise signals (c) error signals (d) all the above 32. The system response of a system can be best tested with (a) unit impulse input signal (b) ramp input signal (c) sinusoidal input signal (d) exponentially decaying input signal 33. Which of the following is a closed loop system (a) electric switch (b) car starter (c) de generator (d) auto-pilot for an aircraft 34. Which of the following is used as an error detector (a) potentiometer (b) field controlled ac motor (c) amplidyne (d) armature controlled ac motor 35. The break away point of root loci are (a) open loop poles (b) closed loop poles (c) open loop zeros (d) closed loop zeros 36. Noise in a control system can be kept low by (a) reducing the bandwidth (b) attenuating such frequencies at which external signals get coupled into the system (c) both (a) and (b) (d) none of these 37. Main cause of absolute instability in the control system is (a) parameters of controlling system (b) parameters of controlled system (c) parameters of feedback system (d) error detector where the two signals are compared 38. Basically a controller is (a) a amplifier (b) a clipper (c) a comparator (d) a summer 39. A system with gain margin close to unity or a phase margin close to zero is (a) highly stable (b) highly oscillatory (c) relatively stable (d) none of these 40. Which of following elements is not used in an automatic control system (a) sensor (b) error detector (c) oscillator (d) final control element 41. AC systems are usually preferred to the DC systems in control applications because (a) AC systems are cheaper (b) AC systems are more stable (c) AC systems have better performance characteristics and smaller in size (d) all of these 42. A system has the transfer function (1-s)/(1+s); It is known as (a) low pass system (b) high pass system (c) all pass system (d) none of the above 43. In control systems, excessive bandwidth should be avoided because (a) noise is proportional to bandwidth (b) it leads to low relative stability (c) it leads to slow speed of response (d) none of these 44. In most systems, an increase in gain leads to (a) larger damping ratio (b) smaller damping ratio (c) constant damping ratio (d) none of these 45. A step function is applied to the input of a system and output is of the form y = t, the system is (a) stable (b) unstable (c) not necessarily stable (d) conditionally stable 46. Which of the following can be magnified by magnetic amplifier (a) voltage (b) current (c) power (d) none of above 47. The inductance is not used in lag network because of (a) big size (b) time delay and hysteresis losses (c) high reactance (d) none of these 48. Saturation in a stable control system can cause (a) conditional stability (b) over damping (c) low level oscillations (d) high level oscillations 49. Excessive noise in control systems can cause (a) reduction in bandwidth (b) reduction in gain (c) saturation in amplifying stages

1 Answers   BSNL,

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FlexiHopper and MetroHopper?

0 Answers   NSN,

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