ITI Electronic Mechanic 2nd Semester Exam PaperS : The course of ITI Electronic Mechanic is of 2 years and where there is semester system, its complete study is done in 4 semesters or it can be said that it is divided into 4 semesters, so below you are given the question paper of its 2nd semester which has already been asked in its exam, so solve it carefully and many more question papers related to this trade are given on our website, by solving which you can prepare yourself.
ITI Electronic Mechanic 1st Semester Exam Papers
ITI Electronic Mechanic 2nd Semester Exam Papers
1. A multiplexer with four select inputs has inputs.
•4
•8
•16
•1
Answer. 16
2. The BCD code of 25510 is?
•1111111
•011111110101
•001001010101
•111111110010
Answer. 001001010101
3. The maximum efficiency of class B amplifier is……?
•50%
• 78.5%
•88%
•92%
Answer. 78.5%
4. Square wave is generated by clipping the ends of the sinusoidal wave. For such a clipper…….. number of diodes are required.
•1
•2
•3
•4
Answer. 2
5. What will be the octal representation of the hexagonal value of 3 AFF?
•74377
•35377
•25377
•16577
Answer. 16577
6. A 3 bit asynchronous counter has ……..?
•3 states
•6 states
•8 states
•9 states
Answer. 6 states
7. The advantages of CMOS logic gates are?
•Very fast
•Consumes very little power
•Operates at very low temperatures
•Does not react to static changes
Answer. Consumes very little power
8. The minimum number of flip-flops required to construct a decode counter is?
•3
•4
•10
•16
Answer. 4
9. Solder paste contains …….?
•Flux and solder powder
•Flux, solder powder and adhesive
•Adhesive and solder powder
•Adhesive and flux
Answer. Flux, solder powder and adhesive
10. A four output binary decoder has …..?
•4 outputs
•8 outputs
•12 outputs
•16 outputs
Answer. 16 outputs
11. A square wave with a period of 10 μs is applied to the clock input of a flip flop. If T = 1 then what will be the period of the signal at the output of the flip flop?
•100us
•20us
•10us
•5us
Answer. 20us
12. Opto capler is mainly used in ……….?
•To amplify very weak signals
•To transfer signal from one circuit to another
•To create isolation between two phases of a circuit
•To change the frequency of light
Answer. To create isolation between two phases of a circuit
13. Generally SCR can be turned on by……..
•By making the anode to cathode voltage positive
•By making the anode to cathode voltage negative
•By giving positive current pulse to the gate
•By making the anode to cathode voltage positive and giving positive current pulse to the gate
Answer. By making the anode to cathode voltage positive and giving positive current pulse to the gate
14. In JFET, the drain current is maximum when VGS is……….?
•Zero
•Negative
•Equal to pinch off voltage
•Twice the pinch off voltage
Answer. Zero
15. A transistor has β 250 and base current is 20 microamperes. What will be the collector current?
•500 μA
•5 mA
•50 mA
• 12.5 μA
Answer. 5 mA
16. A 555 IC based monostable multivibrator uses R = 10 kOhm and capacitor C = 1μF. What is the time period of the output pulse?
•11 sec
• 1.1 sec
•0.11 sec
• 2.2 sec
Answer. 0.11 sec
17. Consider the following thyristors. Which of the following is used as a bilateral switch?
•SCR
•LASCR
•TRIAC
•UJT
Answer. TRIAC
18. In a positive edge triggered JK flip flop, if J = 1 and K = 1 and the clock input, continuously going from low to high, is applied to the maximum state, then
•The output keeps switching between logic 0 and 1
•The output is once complemented
•The output remains continuously at logic 1
•The output remains continuously at logic 0
Answer. The output is once complemented
19. ……… semiconductors are used in manufacturing blue LED.
•Gallium arsenide
•Silicon
•Germanium
•Indium gallium nitride
Answer. Indium gallium nitride
20. When the transistor is turned on in the active region?
•The emitter junction is forward biased and the collector junction is reverse biased
•The emitter junction is reverse biased and the collector junction is forward biased
•Both ends are forward biased
•Both ends are reverse biased
Answer. The emitter junction is forward biased and the collector junction is reverse biased
21. Uni junction transistor is used in…?
•Power amplifiers
•High frequency amplifiers
•Sinusoidal amplifiers Oscillators
•Sawtooth wave generators
Answer. Sawtooth Wave Generators
22. In an open loop Op Amp circuit the opposite input is grounded A 2 volt peak to peak sinusoidal signal when applied to the non inductive input gives the output
•Sine wave whose amplitude depends on the gain of the Op Amp
•Triangular wave whose amplitude depends on the gain of the Op Amp
•Square wave whose amplitude depends on the Op Amp
•Square wave whose amplitude depends on the saturation of the Op Amp
Answer. Square wave whose amplitude depends on the saturation of the Op Amp
23. Any combinational circuit can be built using ……..
•Only NAND gates
•Only XOR gates
•Only XNOR gates
•AND gates and OR gates
Answer. NAND gates only
24. What is the difference between MOSFET and IGBT?
•IGBT is a controlled device and MOSFET is a voltage controlled device
•IGBT has four terminals and MOSFET has three terminals
•MOSFET has better handling capacity
than IGBT •IGBT has higher forward voltage drop than MOSFET
Answer. MOSFET has better handling capacity than IGBT
25. In RC phase shift oscillator a minimum number of RC networks are connected in cascade of ………..
•One
•Two
•Three
•Four
Answer. Three
26. An ideal operational amplifier should have……..
•High input impedance and low output impedance
•Low output impedance and high voltage gain
•High voltage gain and high output impedance
•Low input impedance and low output impedance
Answer. High input impedance and low output impedance
27. The input stage of a typical operational amplifier will be?
•Emitter follower
•Push pull amplifier
•Common base amplifier
•Dual input balanced output differential amplifier
Answer. Dual input balanced output differential amplifier
28. Race around condition can be observed
in •R S flip flop
•J K flip flop
•D flip flop
•All flip flops
Answer. In J K flip flop
29. The output of JK flip-flop is zero. On adopting a clock pulse it becomes 1. So the inputs J and K will be………
•J = 1 and K = 1 and 0
•J = 0 and K = 1 and 0
•J= 1 and 0 and K= 0
•J = 1 and 0 and K = 1
Answer. J = 1 and K = 1 and 0
30. The decimal equivalent of (242)8 is……..?
•165
•162
•824
•484
Answer. 162
31. Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is ……….?
•Unipolar, voltage controlled, two ended device
•Bipolar, current controlled, three ended device
•Unipolar, voltage controlled, three ended device
•Bipolar, current controlled, two ended device
Answer. Unipolar, voltage controlled, three ended device
32. Schmitt trigger is a circuit which is used for ……..
•Triggering SCR
•Clipping
•Clamping
•To convert sine wave into square wave
Answer. To convert sine wave into square wave
33. When a bipolar ended transistor is used as a switch then the transistor will operate on …….
•Saturation region and cutoff region
•In saturation region and active region
•In active region and cutoff region
•Only in saturation region
Answer. Saturation region and cutoff region
34. Darlington amplifier has –
•High current gain and high input resistance
•High current gain and low input resistance
•High voltage gain and high input resistance
•High voltage gain and low input resistance
Answer. High current gain and high input resistance
35. Invalid output state of BCD counter is?
•1000
•0001
•0000
•1110
Answer. 1110
36. In FET, the drain voltage beyond which the drain current does not increase is called?
•Break down voltage
•Saturation voltage
•Pinch off voltage
•Critical voltage
Answer. Pinch off voltage
37. Common base configuration is used to provide.
•Current advantage
•Voltage advantage
•Power advantage
•Trans resistance advantage
Answer. Voltage advantage
38. Instead of conventional lead components, SMD components are more useful because
•SMD components can be easily soldered and painted
•SMD components are cheaper
•SMD components are easily available
•Reduces unwanted capacitance and inductance
Answer. Reduces unwanted capacitance and inductance
39. FET amplifier is used in many measuring instruments because FET has ………-
•Advantage of high voltage
•Advantage of high current
•Low input resistance
•High input resistance
Answer. High input resistance
40. Which of the following oscillators has good frequency stability?
•RC phase shift oscillator
•Hartley oscillator
•Colpitts oscillator
•Crystal oscillator
Answer. Crystal Oscillator
41. Digital gate whose output goes low when the output of ……… is high.
•OR gate
•NOR gate
•XOR gate
•NAND gate
Answer. NAND gate
42. A multi vibrator used to produce square waveforms is?
•Mono stable multi vibrator
•Bi stable multi vibrator
•Astable multi vibrator
•Accumulator trigger
Answer. Astable multi vibrator
43. How many NAND gates will be required to make an OR gate?
•2
•3
•4
•5
Answer. 3
44. The efficiency of class C amplifier is ……. and distortion is …….
•High, Low
•Low, High
•Low, Low
•High, High
Answer. High, High
45. DV/dt protection in an SCR can be achieved by using …….?
•RL series with the SCR
•RC across the SCR
•In series with the SCR
•RC in series with the SCR
Answer. RC across the SCR
46. In a transistor with a bipolar junction:
•The base, collector and emitter regions have equal width
•The base is heavily doped and the width of the base is very small
•The base is lightly doped and the width of the base is very large
•The emitter is heavily doped and the width of the base is lightly doped
Answer: Emitter is heavily doped and the width of the base is lightly doped
47. After 85 clock periods the current state of the decade counter is 0011. What will be the state of the counter later?
•1000
•0101
•1001
•0011
Answer. 1000
48. In a 8 bit serial parallel out shift register, how many clock periods will be required to store 8 bits of data?
•1
•2
•8
•16
Answer. 8
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