Name of the Organisation : State Board of Technical Education and Training, Andhra Pradesh, Hyderabad
Document Type : Model Question Paper
Category : Applied Electronics & Instrument Engg
Subject : Electrical Machines
Website : sbtetap [dot] gov [dot] in
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Applied Electronics & Instrument Model Question Paper :
Electrical Machines :
Time: 3 Hours
Total Marks: 80
PART – A : 10x 3 = 30
Related : State Board of Technical Education & Training Diploma In Metallurgical Thermodynamics Question Paper : www.pdfquestion.in/13699.html
Instructions :
(1) Answer all questions. Each question carries two marks.
(2) Answer should be brief and straight to the point and shall not exceed five simple sentences.
1) State the Operating principle of DC Motor.
2) State the EMF Equation of DC Generator.
3) List the Various Losses in DC Machine.
4) Define Efficiency of a Transformer.
5) State the condition for maximum efficiency of a 1-? Transformer
6) Define (i) Slip Speed (ii) Slip.
7) List the applications of 3-? Induction motor.
8) Define (i) Pitch factor (ii) Distribution factor of armature winding
9) List the applications of synchronous motor.
10) State working Principle of Repulsion motor.
PART – B : 5 x10 = 50
Instructions :
(1) Answer any five questions. Each question carries ten marks
(2) The answers should be comprehensive and the criteria for valuation the content but not the length of the answer?
11) Explain Operation of 3-point starter with neat sketch. (10)
12) Explain the speed control methods of DC Motor by (5+5)
(i) Armature control method
(ii) Field control method.
13) Explain O.C. and S.C. tests on a 1-? Transformer . (5+5)
14) (a) State the E.M.F. equation of a 1-? Transformer. (5+5)
(b) A 1-? transformer has 400 primary and 1000 secondary turns, the net cross sectional area of the core is 60cm2. Maximum flux density in the core is 0.976wb/m2 .If the primary winding is connected to 50Hz supply. Calculate the primary induced voltage .
15) Explain the working principle of 3-? induction motor. (10)
16) . Explain the Constructional details of squirrel cage and slip ring induction motor (10)
17) Explain the working principle of an alternator. (10)
18) (a) List the applications of synchronous motor. (5+5)
(b) Explain the working principle of stepper motor.
Digital Electronics :
Time: 3 Hours
Total Marks: 80
Part – A : 10x 3 = 30
Instructions :
** Answer all questions. Each question carries three marks.
1) Compare weighted and Un-weighted codes.
2) State De-Morgan’s theorems.
3) State the function of the Half-adder
4) List the applications of MUX .
5) Study the need for preset.
6) Define sequential logic circuits
7) Differentiate between synchronous and asynchronous inputs.
8) List various types of memories
9) State the need for a Register.
10) State the need for D/A conversion.
Part – B : 5 x10 = 50
Instructions :
** Answer any five questions. Each question carries ten marks
11) a) Explain AND, OR, NOT operators with truth table.
b) Explain Binary and Octal number systems
12) a) Develop AND, OR, NOT operations using NAND, NOR gates.
b) subtract 1110.00 from 101.101 using 2’s complement method.
13) a) Draw and explain the operation 4 X 1 Multiplexer
b) Draw Half adder circuit using Exclusive OR gate and an AND gate.
14) Draw and explain two-bit digital comparator.
15) Explain the decade counter.
16) Explain JK Master Slave flip flop with truth table
17) a) Differentiate between ROM and RAM
b) Explain working of serial in Parallel out and Parallel in serial out Registers.
18) Explain A/D conversion using successive approximate method
Electronic Measuring Instruments :
Time: 3 Hours
Total Marks: 80
Part – A : 10x 3 = 30
Instructions :
** Answer all questions. Each question carries three marks.
1) Explain the principle of operation of PMMC.
2) State the balancing conditions of Bridges.
3) Explain the use of Megger.
4) List the advantages of Digital instruments over Analog instruments
5) List the specifications of Digital Voltmeter.
6) Define Deflection sensitivity
7) Describe the purpose of delayline.
8) List the conditions for Stationary & Flickerfree waveforms
9) Explain the importance of shielding.
10) State the necessity of plotters.
Part – B : 5 x10 = 50
Instructions :
** Answer any five questions. Each question carries ten marks
11) Explain the working of FET-input voltmeter
12) Explain the Capacitance measurement using Schering bridge.
13) Describe the working of RAMP-type Digital Voltmeter.
14) Explain the working of Digital Frequency meter with its specifications.
15) Descibe the function of each block of general purpose CRO.
16.a) Explain Triggered sweep with necessary circuit.
b) Write the procedure for measurement of Voltage, Frequency using CRO .
17) Explain the working of RF signal generator
18) Describe the working of Logic Analyser with block diagram