Board : Higher Secondary Education, Government Of Kerala
Exam : 11th Standard Electronics Service Technology
Document type : Question Paper
Website : dhsekerala.gov.in
Download Sample/ Model Question Papers : https://www.pdfquestion.in/uploads/5995-01126_1_14_q.pdf.pdf
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Electronics Service Technology – 1 Model Question :
FEBRUARY 2012
Maximum Score : 60
Time : 2 Hours
STD :XI
Cool off time : 15Minutes
Related : HSE Higher Secondary Education Kerala English Model Question Paper : www.pdfquestion.in/5993.html
General Instructions to Candidates :
** There is a ‘Cool off time’ of 15 minutes in addition to the writing time of 2 Hrs.
** You are not allowed to write the answers nor to discuss anything with others
** Use ‘cool off time’ to get familiar with questions and to plan your answers.
** Read questions carefully before answering.
** All questions are compulsory and only internal choice is allowed.
** When you select a question, all the sub-questions must be answered from the same question itself.
1. Select the highest resistance value from the following :
a) Yellow, Violet, Black, Gold. b) Brown, Green, Black, Gold.
c) Brown, Black, Black, Gold. d) Blue, Grey, Black, Gold. (1)
2. Classify the following components into active and passive
a) 2N2646 (b) OA 79 (c) BFW10 (d) 102 (2)
3. (a) For a sinusoidal AC voltage of rms value 70.7V the peak to peak value is —————— (1)
b) V1=4sin628t V2=8sin(628t+90- ). Sketch the waveforms V1 and V2 on the
same graph indicating peak voltages and time periods. Find the frequency and rms value of the signals. ( 3)
4. The equivalent resistance of four resistors joined in parallel is 20 O. The current
flowing through them are 0.6A, 0.4A, 0.2A and 0.1 A. Calculate the value of each resistor. (3)
5. Compare the reverse characteristics of IN 4001 and 6.2V zener diode. (3)
6. Ripple factor of a bridge rectifier is ____________ (1)
7. Match the following Device Feature
(a) DIAC IE = IC + IB (b) FET Dark current (c) Transistor PIV
(d) Diode Holding current (e) Photo diode Bidirectional (f) SCR Pinch of voltage (3)
8. (a) Draw the symbols of NPN and PNP transistors (1)
(b) Name three layers of PNP transistor. Compare the three layers. (3)
9. (a) Name the two basic types of MOSFET (1)
(b) Draw the characteristics of FET. (3)
frequency response of an amplifier.
(a) Identify the amplifier (1)
(b) The figure shows that there will be a fall in gain at both ends. Explain this
13. (a) Name any two transistor biasing methods (1)
(b) Explain with diagram the most commonly used biasing method (3)
14. A circuit generate an output frequency of f = _____1___ 2p v6 RC
(a) Name the circuit (1) (b) Sketch the circuit diagram (3)
15. Compare the output waveform of a bridge rectifier with capacitor and inductor filter. (2)
16. Suggest an amplifier which corresponds to a half wave rectifier (1)
17. (a)Write a suitable feedback circuit for an amplifier circuit (1)
(b) Give reasons for your selection (3)
18. (a) ________ instrument is used to visualize the wave forms (1)
(b) Draw its block diagram (3)
OR
19. Name and draw the block diagram of an instrument which can generate square, sine and triangular waves. (4)
20. (a) A PMMC instrument may be converted to a DC volt meter by connecting appropriate values of resistors in _______________ with the coil. (1)
Electronics Service Technology – 1 :
Std. XI :
Time: 2 Hrs
Score:60
1. The expression for an alternating voltage is given as v = 12 sin 324 t. Find out the rms value and time period of the signal. (2)
2. a) State Kirchoff’s current law . (1) b) Find current I. (2)
3.. Arrange the following resistors in ascending order. (Four band colour code system is used here)
a) Brown Black Red
b) Brown Black Black
c) Brown Black Brown
d) Brown Black Gold (2)
4. a) Biju requires 5µF capacitor for his project. Some 10µF capacitors are available with him. Can you suggest any solution for the above situation. (1)
b) What will be the status of bulb in the given circuit. (1)
c) Give reasons. (2)
5. a) The principle behind the operation of a transformer is ————–. (1)
b) A transformer has 200 turns in primary and 50 turns in secondary. Primary current is 0.5 A and secondary voltage is 20V. Calculate power at its secondary. (2)
6. ii) Give reason. (2)
7. Identify the symbols and give one application each. (4)
8. Referring to the figure, answer the following questions.
a) Identify the circuit. (1)
b) PIV of the circuit. (1)
c) Draw the output waveform corresponds to the input signal. (2)
d) What happens to the output if the capacitor value is increased. Justify. (2)