EE401,EC401,DEE19,DETE19

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1 EE401,EC401,DEE19,DETE19 IV SEMESTER DIPLOMA EXAMINATION, JANUARY 2013 LINEAR & DIGITAL ICs Time: 3 Hours Max. Marks: 75 GROUP A : Answer any three questions. (Question No. 1 is compulsory) Q.1 What is OPAMP? State features of IC 741? (05) Q.2 Draw and Explain operation of Monostable Multivibrator using IC 555. (10) Q.3 Explain briefly why NAND and NOR gate is called Universal gates and show with truth tables and logic circuits (10) Q.4 Explain operation of JK Flip flop with truth table and logic diagram (10) Q.5 What is full adder with truth table? Explain and Design full adder circuit using logic gate (10) GROUP B : Answer any three questions. (Question No. 6 is compulsory) Q.6 Draw block diagram of IC555 with pin configuration? (05) Q.7 Explain functional block diagram of 3 pin voltage regulator IC. (10) Q.8 Design a 3-bit synchronous counter suing J-K FLIP-FLOPs. (10) Q.9 Minimize the four variable logic function. (10),(,, ) DCBAf ADCABCD BCBACADBACBA Q.10 Explain operation of TTL NAND gate (10) GROUP C: All Questions are Compulsory. Q.11 Fill in the blanks. (Each question carries 2 marks) 7805 is terminal voltage regulator IC. Twos's complement of is. The TTL stands for. Flip dlops are logic R-2R is converter Q.12 Multiple choice question. (Each question carries 2 marks) Voltage regulators keep a constant output voltage when the input or load varies within limits. (a) Dc. (b) Ac. (c) Ripple (d) [NIL]. If a 3-input NOR gate has eight input possibilities, how many of those possibilities will result in a HIGH output? (a) 1. (b) 2. (c) 7. (d) 8. How many 3-line-to-8-line decoders are required for a 1-of-32 decoder? (a) 1. (b) 2. (c) 4. (d) 8.

2 What is the difference between a 7490 and a 7492? (a) 7490 is a MOD-12, 7492 is a MOD-10. (b) 7490 is a MOD-12, 7492 is a MOD-16. (c) 7490 is a MOD-16, 7492 is a MOD-10. (d) 7490 is a MOD-10, 7492 is a MOD-12. The storage element for a static RAM is the. (a) Diode. (b) Resistor. (c) Capacitor. (d) Flip-flop. Q.13 True or false (Each question carries 1 marks) For an ideal Op-Amp Power Supply Rejection Ratio (PSRR) = 0. In a Moore machine the outputs depend only on the present state. Data in the parallel form can be converted into serial form by using the SIPO shift register. The fastest A/D converter is parallel comparator type. The number of resistors required for an N bit D/A converter is 2N in the case of R-2R ladder D/A converter. ******

3 EE402,EC402,DEE20,DETE20 IV SEMESTER DIPLOMA EXAMINATION, JANUARY 2013 COMPUTER HARDWARE AND NETWORKING Time: 3 Hours Max. Marks: 75 GROUP A : Answer any three questions. (Question No. 1 is compulsory) Q.1 What are network topologies? (05) Q.2 List different types of computers and explain. (10) Q.3 State characteristics of storage devices. (10) Q.4 List the functions of modem. (10) Q.5 Define network explain different types of network. (10) GROUP B : Answer any three questions. (Question No. 6 is compulsory) Q.6 What is bit? Define byte. 1K bit represents how many bits. (05) Q.7 What is input and output devices? List 2 input and output devices. (10) Q.8 What are the steps to build a PC? (10) Q.9 What is a virus? List any 2 names of viruses. (10) Q.10 Explain signature-based detection used to identify malware. (10) GROUP C: All Questions are Compulsory. Q.11 Fill in the blanks. (Each question carries 2 marks) An identifies a host machine on the internet. Extended ISA has a Bit data bus but still operates at 8MHZ. refers to the ability of sound card to generate multiple simultaneous voices when playing MIDI. A format is used for letters, memos, reports and newsletters. A a piece of hardware with which you produce a raw product. Q.12 Multiple choice question. (Each question carries 2 marks) Which is not a type of network topology. (a) Ring (b) Square (c) Star (d) Bus Step which is used to Installion of os. (a) Push the card in slot (b) Place the optical drive into the bay (c) Plug the cable of cabient fans (d) Reboot the PC Which is the type of scanner. (a) Multi function (b) Laser (c) Sheetfed (d) Label Which is not the type of ouput Device. (a) Moniter (b) Plotter (c) Printer (d) Joystick Find out which is the high level language. (a) BASIC (b) PASCAL (c) FORTAN (d) C++

4 Q.13 True or false (Each question carries 1 marks) A network device that connects two different systems, using direct and systematic translation between protocols. Topology is the geometric arrangement of devices on the network. AGP stands for Advance Geological port. USB cable length are limited to % meters. Flow controls means ability to slow down the flow of bytes in a wire. ******

5 EE403, DEE21 IV SEMESTER DIPLOMA EXAMINATION, JANUARY 2013 ELECTRICAL MACHINES-II Time: 3 Hours Max. Marks: 75 GROUP A: Answer any three questions. (Question No. 1 is compulsory) Q.1 Define an alternator. (05) Q.2 Draw a lab led diagram showing the construction of an alternator. (10) Q.3 Explain the principle of working of a single-phase induction motor with the help of double revolving field theory. (10) Q.4 Explain phenomenon of hunting in synchronous motors. How is it minimized? (10) Q.5 What are the advantages and disadvantages of synchronous motor? (10) GROUP B: Answer any three questions. (Question No. 6 is compulsory) Q.6 What is the effect of variation of load? (05) Q.7 What will happen if starter is not provided in 3 phase induction motor? (10) Q.8 State advantages of rotating field over rotating armature construction of three phase alternator. (10) Q.9 How is the direction of rotation of resistance split-phases type and capacitor split phase type single-phase induction motors reversed? (10) Q.10 Why are the a.c. series motors preferred for electric traction (10) GROUP C: All Questions are Compulsory. Q.11 Fill in the blanks (Each question carries 2 marks) Resistance is the opposition offered to. The main purpose of performing open circuit test on a transformer is to measure its. The slip of an induction motor normally varies between. A step up transformer increases. In an induction motor, there is no electrical connection to the. Q.12 Multiple choice question. (Each question carries 2 marks) Change in the excitation of a synchronous motor changes its. (a) Speed (b) Power factor (c) Armature back emf (d) Both b & c. A transformer has negative voltage regulation when its load power factor is. (a) Zero (b) Unity (c) Lagging (d) Leading

6 When load on an induction motor is increased. (a) Rotor current is increased (b) Rotor torque is increased (c) Rotor slip is increased (d) All of the above The main purpose of performing open circuit test on a transformer is to measure its. (a) Cu loss (b) Core loss (c) Total loss (d) Insulation resistance The single phase motor that can be used both on ac & dc supply is called a. (a) Unique motor (b) Universal motor (c) Reluctance motor (d) Hysteresis motor Q.13 True or false (Each question carries 1 marks) The synchronous speed of a synchronous motor depends on supply line frequency, number of motor poles. Stator flux of an induction motor rotates at constant speed. Projected poles smooth cylindrical are types of rotors. Motor works on the principle of mutual inductance. Speed control of three phase induction motor can be done by pole changing method. ******

7 EE404,DEE22 IV SEMESTER DIPLOMA EXAMINATION, JANUARY 2013 MEASUREMENT AND INSTRUMENTS Time: 3 Hours Max. Marks: 75 GROUP A : Answer any three questions. (Question No. 1 is compulsory) Q.1 Explain with diagram how should an ammeter and voltmeter be connected in an electric circuit to measure current and voltage? (05) Q.2 How to extent the range of DC ammeter. (10) Q.3 Give the classification of watt meters. (10) Q.4 Explain the construction and principle of operation of maximum demand Indicator. (10) Q.5 Explain linear variable differential transducer (LVDT). (10) GROUP B : Answer any three questions. (Question No. 6 is compulsory) Q.6 Explain the construction and principle of operation of PMMC instruments.(05) Q.7 Explain the term calibration with suitable example. (10) Q.8 Write short note on (10) (1) Ultraviolet Recorder (2) Magnetic tape recorder Q.9 Write short note on proximity sensors. (10) Q.10 Explain the construction and principle of operation of Dynamometer type instruments. (10) GROUP C: All Questions are Compulsory. Q.11 Fill in the blanks. (Each question carries 2 marks) can be used in various made for force measurement. Piezo Electric effects divided in the groups:- 1) 2) In LVDT, ideally the output voltage of null position should be equal to is used in almost all sophisticated measurement system. is mechanically connected to the armature of the d.c motor. Q.12 Multiple choice question. (Each question carries 2 marks) Electron flow induced by ionization of gas due to radio-active radiation is the principle of. (a) Ionization chamber (b) photo emissive cell (c) Hall effect pickup, (d) eddy current gauge. A.C. Energy meters should be tested at % of marked current with unity power factor. (a) 1 (b) 5 (c) 10 (d) 20

8 In suspended coil torsion wattmeter mutual inductance errors are completely eliminated by making zero position of coil such that angle between planes of moving coil and fixed coil =. (a) 30 (b) 60 (c) 90 (d) 120 Driving system of meter consists of electro magnets in induction type energy meter. (a) 1 (b) 2 (c) 3 (d) 4 Value of modulus of elasticity of barium titante is (a) N /m (b) N /m (c) N /m, (d) N /m Q.13 True or false (Each question carries 1 marks) The permanent magnet moving coil instrument is the most accurate type of AC measurement. Sensitivity (S) 1 S ohm/ volt Im CRO is not used for the comparison of phase and frequency. By using Electrical Transducer the effects of friction are minimized. In LVDT relatively loge displacements are required for appreciable differential output.

9 EE405/DEE23-L IV SEMESTER DIPLOMA ELECTRICAL ENGINEERING EXAMINATION JANUARY-2013 IC LAB Time: 1 hours (5X5=25) I. ANSWER ALL QUESTIONS. 1. Construct a Decade counter using 7473 Ics and observe the output waveform. 2. Construct and verify the performance of a 1 digit counter using 7490, 7447, 7475 and seven segment LEDs. 3. Construct a 4 bit weighted Resistor D/A converter and test its performance. 4. Construct a 4 bit r-2r Ladder D/A converter and test its performance. 5. Verify the operation of ADC.

10 EE406/DEE24-L IV SEMESTER DIPLOMA ELECTRICAL ENGINEERING EXAMINATION JANUARY-2013 ELECTRICAL MECHINES-II Time: 1 hours (5X5=25) I. ANSWER ALL QUESTIONS. 1. Predetermination of regulation of alternator by synchronous impedance method. 2. Load Test on single Phase alternator. 3. Load Test on three Phase Alternator. 4. Synchronising of two alternators by lamp & synchroscope method. 5. Determination of V Curve and inverted V curves of a three phase synchronous motor.

Synchronous Machines Study Material

Synchronous Machines Study Material Synchronous machines: The machines generating alternating emf from the mechanical input are called alternators or synchronous generators. They are also known as AC generators. All modern power stations