July2017 ELECTRONICS MECHANIC/ MECHANIC CONSUMER ELECTRONICS
APPLIANCES / TECHNICIAN POWER ELECTRONIC SYSTEM THEORY SEMESTER-I
A gang capacitor is a variable capacitor in which the capacitance is varied by changing the -
a) Dielectric b) Number of plates
c) Plate area d) Distance between the plates
2. If three 9 mH inductors are connected in parallel, assuming that there is no mutual inductance, the total inductance will be -
c) 27 ml-I d) 0.33 ml-I
3. In a series RLC circuit, increasing frequency will always result in-
a) Decrease resistance
b) Increase resistance
c) Inductive and Capacitive reactance changes
d) Impendence will always decrease
4. At wh'at frequency the current in series RLC circuit reaches its maximum value for applied voltage of 15V and R=500Q, IOOBH and C=O.001gF.
a) 503 KHz b) 403 KHz
c) 603 KHz d) 303 KHz
5. A diode that has negative resistance region and widely used in the design of high frequency oscillators is-
a) Zener diode b) Tunnel diode
c) Schottky diode d) Varactor diode
The maximum rectification efficiency of a full •wave rectifier is-
a) 40.8% b) 81.2%
In typical lead based solder, the percentage of tin and lead is-
a) 60%, b) 40%,
Booklet Series • B
c) 20%, d) 30%, Contd. ...2/ 17/B/C/S-1/4/E -2-
8. The core material in typical lead based solder used to solder electronic components is-
a) Acid core b) Rosin core
c) Germanium core d) Wax core
9. If the input frequency to a full wave rectifier is 100Hz, then the ripple frequency at the
output of filter, the ripple frequency is-
a) 100 Hz b) 200 Hz
c) 400 Hz d) 50 Hz
10. An ohm meter is connected across an inductor and its pointer indicates zero ohms. The inductor is-
a) Open b) Good
c) Shorted • d) Partly shorted
11. While measuring the current in a circuit that is operated on an 18V battery ammeter reads 40mA. Later the current is dropped to 20 mA. How much the voltage will change?
a) 900 rnV c) 18V d) OV
12. A IKQ, 1 Watt resistor can safely pass a current of-
a) mA b) 60 mA c) 40 mA d) 100 mA
13. Two resistors are connected in parallel across a battery of 2V and current drawn from the battery is 2A. If one of the resistor is disconnected, the current will become 1.5A. What is the resistance of the disconnected resistor?
a) 20 b) 40 c) IQ d) O.5Q
14. What is the peak voltage of a sine wave that measures 220V AC rms?
a) 155V b) 169 V c) 311V d) 440V
15. Ifthe length of a wire of resistance R is uniformly stretched 'n' times of its original value, its new resistance will be-
b) n2R d) R/n2
16. The leads of a multi meter are connected across a diode in following manner. Red lead connects to the end of diode with marking band (cathode) and black lead connects on other end. What does a reading of -0.6V indicate.
a) Forward Bias, leads connected with proper polarity
b) Reverse Bias, leads conhected with proper polarity
c) Forward Bias, leads connected with reverse polarity
d) Reverse Bias, leads connected with reverse polarity
17. All other factors remaining same, what is the effect of increasing wire gauge from SWG
22 To SWG 26
a) Impedance will decrease b) Resistance will decrease
c) Impedance will increase d) Capacitance will' increase
18. Cells are connected in parallel to-
a) Increase efficiency b) Increase voltage output
c) Increase current capacity d) Increase internal resistance
Contd.. ..3/-
Booldet Series - B
17/B/C/S-1/4/E
19. Which of the cell is rechargeable?
a) Aluminium ion battery b) Silver Oxide battery
c) Zinc Chloride battery d) Lithium ion battery
20. The ratio of maximum value to effective value of an alternating current or voltage is called as-
a) Form Factor b) Peak Factor
c) Leakage Factor d) Ripple Factor
21. A heavily doped semiconductor has-
a) High Resistance b) Low Resistance
c) No change in semiconductor characteristics d) More heat dissipation
22. A coil of 5mH inductance and IOQ resistance is connected in series with 5BF capacitor. The frequency at which the circuit resonates is-
a) 1.0065 KHz b) 2.125 c) 4.5 KHz d) 10 KHz
23. A coil of inductance 0.1 H and resistance 10 Q is connected in series with a capacitor of 0.1 1-IF the quality factor of circuit at resonance is approximately.
a) 200 c) 100 d) 50
Consider air core inductors.
a) They have high core loss
b) They have high inductance compared to similar ferrite core inductors
c) They can be used for low frequency applications
d) They can be used for high frequency applications
25. Minimum leakage flux is achieved using
a) Air core inductors b) Silicon steel core inductors
c) Ferrite rod inductors d) Torroidal core inductors,
26. What will happen if the primary of a transformer is connected to a DC supply?
a) Transformer will operate with low efficiency
b) Output voltage reduces
c) Output current reduces
d) Transformer may start to smoke and burn
27. High frequency transformers uses ferrite cores because it has-
a) High specific density b) High resistance
c) High Hysteresis d) Low permeability
28. Transformer core is laminated to-
a) Reduce hysteresis loss b) Reduce eddy current loss
c) Reduce copper loss d) Reduce all the above loss
29. In an intrinsic semiconductor at room temperature-
a) There is no holes
b) There is no free electrons
c) The numbers of holes are less compared to number of free electrons
d) 'Ihe number of free electrons and hole are same Contd. ...4/-
Booldet Series - B
17/B/C/S-1/4/E
30. The diode that is used for obtaining stable reference voltage is-
a) Varactor Diode b) Zener Diode
c) Tunnel Diode d) Schottky
31. The wattage range of typical soldering gun used to solder analog electronic components is-
a) 25W to loow b) 250W to 500W
c) loow to 500W d) 250W to looow
32. IC 723 is a-
a) Fixed output voltage regulator b) Variable output voltage regulator'
c) Operational Amplifier d) Voltage controlled Oscillator
33. Right click an item in desktop using a mouse results in-
a) Display a list of things we can do with the item
b) Select the item
c) Open.the item
d) Close 'the item
34. The port through which most of the modern devices like external hard disk, printer, scanner and mouse can be connected is-
a) PS/2 port b) Parallel port c) USB port d) VGA port
35. Modems are connected to computer through-
a) USB port b) VGA port c) Centronics port d) RJ45 port
36. In MS-WORD, if you need to change the typeface and character size of a document, which menu you will choose-
a) Edit b) View c) Format d) Tools
37. In MS-WORD pressing F8 key for three times select-
a) A paragraph b) A sentence
c) A word d) Entire Document
38. In MS-WORD, from which menu you can insert Header and Footer-
a) Format b) View c) Tools d) Insert
39. Which option in EXCEL can be used to split windows into two?
a) Format->Window b) View->Window->Split
c) Window->Split d) View->Split
40, In EXCEL getting data from a cell located in a different sheet is called as-
a) Accessing b) Referencing
c) Updating d) Data Acquiring
41. The computer network cable that supports very high data rates and least affected by electromagnetic radiation is-
a) Coaxial cable b) Shielded twisted pair
c) Wave guides d) Optical fibre cable
Contd.. ..5/
17/B/C/S-1/4/E
42. Which of the following is not an internet search engine?
a) Yahoo b) Firefox c) Bing d) MS-Access
43. The device that forward packet through appropriate to different networks is called-
a) Bridge b) Router
c) Hub d) Transponder
44. In an RL series circuit.
0 1800
a) Current lags voltage by less than 90 b) Current lags voltage by
c) Current lags voltage by 900 d) Current leads voltage by less than 900
45. Which of the following capacitor is suitable for DC filter circuits?
a) Mica b) Ceramic
c) Paper d) Electrolytic
46. Thé peak inverse voltage of a full wave centre tapped rectifier ciicuit is equal to of the input signal.
a) Thrice the peak b) Twice the peak
c) One half the peak d) One third the peak
47. Which of the following devices can be used to protect devices from sudden voltage variations?
a) Tunnel Diode b) Switching Diode
c) Varactor Diode d) Schottky Diode
48. When electric field in the depletion region of a PN junction increases to the point where it can break the covalent bonds and generate electron-hole pairs, we cåll it as-
a) Avalanche break down b) Zener break down
c) Diffusion break down d) Covalent break down
49. In a material if the number of valence electrons of an atom is less than 4, then the material is called as-
a) Conductor b) Insulator
c) Semiconductor d) None of these
50. Resistors with colour bands in body are generally-
a) Wire wound resistors b) Carbon compound resistors
c) Potentiometers d) Rheostat
APPLIANCES / TECHNICIAN POWER ELECTRONIC SYSTEM THEORY SEMESTER-I
A gang capacitor is a variable capacitor in which the capacitance is varied by changing the -
a) Dielectric b) Number of plates
c) Plate area d) Distance between the plates
2. If three 9 mH inductors are connected in parallel, assuming that there is no mutual inductance, the total inductance will be -
c) 27 ml-I d) 0.33 ml-I
3. In a series RLC circuit, increasing frequency will always result in-
a) Decrease resistance
b) Increase resistance
c) Inductive and Capacitive reactance changes
d) Impendence will always decrease
4. At wh'at frequency the current in series RLC circuit reaches its maximum value for applied voltage of 15V and R=500Q, IOOBH and C=O.001gF.
a) 503 KHz b) 403 KHz
c) 603 KHz d) 303 KHz
5. A diode that has negative resistance region and widely used in the design of high frequency oscillators is-
a) Zener diode b) Tunnel diode
c) Schottky diode d) Varactor diode
The maximum rectification efficiency of a full •wave rectifier is-
a) 40.8% b) 81.2%
In typical lead based solder, the percentage of tin and lead is-
a) 60%, b) 40%,
Booklet Series • B
c) 20%, d) 30%, Contd. ...2/ 17/B/C/S-1/4/E -2-
8. The core material in typical lead based solder used to solder electronic components is-
a) Acid core b) Rosin core
c) Germanium core d) Wax core
9. If the input frequency to a full wave rectifier is 100Hz, then the ripple frequency at the
output of filter, the ripple frequency is-
a) 100 Hz b) 200 Hz
c) 400 Hz d) 50 Hz
10. An ohm meter is connected across an inductor and its pointer indicates zero ohms. The inductor is-
a) Open b) Good
c) Shorted • d) Partly shorted
11. While measuring the current in a circuit that is operated on an 18V battery ammeter reads 40mA. Later the current is dropped to 20 mA. How much the voltage will change?
a) 900 rnV c) 18V d) OV
12. A IKQ, 1 Watt resistor can safely pass a current of-
a) mA b) 60 mA c) 40 mA d) 100 mA
13. Two resistors are connected in parallel across a battery of 2V and current drawn from the battery is 2A. If one of the resistor is disconnected, the current will become 1.5A. What is the resistance of the disconnected resistor?
a) 20 b) 40 c) IQ d) O.5Q
14. What is the peak voltage of a sine wave that measures 220V AC rms?
a) 155V b) 169 V c) 311V d) 440V
15. Ifthe length of a wire of resistance R is uniformly stretched 'n' times of its original value, its new resistance will be-
b) n2R d) R/n2
16. The leads of a multi meter are connected across a diode in following manner. Red lead connects to the end of diode with marking band (cathode) and black lead connects on other end. What does a reading of -0.6V indicate.
a) Forward Bias, leads connected with proper polarity
b) Reverse Bias, leads conhected with proper polarity
c) Forward Bias, leads connected with reverse polarity
d) Reverse Bias, leads connected with reverse polarity
17. All other factors remaining same, what is the effect of increasing wire gauge from SWG
22 To SWG 26
a) Impedance will decrease b) Resistance will decrease
c) Impedance will increase d) Capacitance will' increase
18. Cells are connected in parallel to-
a) Increase efficiency b) Increase voltage output
c) Increase current capacity d) Increase internal resistance
Contd.. ..3/-
Booldet Series - B
17/B/C/S-1/4/E
19. Which of the cell is rechargeable?
a) Aluminium ion battery b) Silver Oxide battery
c) Zinc Chloride battery d) Lithium ion battery
20. The ratio of maximum value to effective value of an alternating current or voltage is called as-
a) Form Factor b) Peak Factor
c) Leakage Factor d) Ripple Factor
21. A heavily doped semiconductor has-
a) High Resistance b) Low Resistance
c) No change in semiconductor characteristics d) More heat dissipation
22. A coil of 5mH inductance and IOQ resistance is connected in series with 5BF capacitor. The frequency at which the circuit resonates is-
a) 1.0065 KHz b) 2.125 c) 4.5 KHz d) 10 KHz
23. A coil of inductance 0.1 H and resistance 10 Q is connected in series with a capacitor of 0.1 1-IF the quality factor of circuit at resonance is approximately.
a) 200 c) 100 d) 50
Consider air core inductors.
a) They have high core loss
b) They have high inductance compared to similar ferrite core inductors
c) They can be used for low frequency applications
d) They can be used for high frequency applications
25. Minimum leakage flux is achieved using
a) Air core inductors b) Silicon steel core inductors
c) Ferrite rod inductors d) Torroidal core inductors,
26. What will happen if the primary of a transformer is connected to a DC supply?
a) Transformer will operate with low efficiency
b) Output voltage reduces
c) Output current reduces
d) Transformer may start to smoke and burn
27. High frequency transformers uses ferrite cores because it has-
a) High specific density b) High resistance
c) High Hysteresis d) Low permeability
28. Transformer core is laminated to-
a) Reduce hysteresis loss b) Reduce eddy current loss
c) Reduce copper loss d) Reduce all the above loss
29. In an intrinsic semiconductor at room temperature-
a) There is no holes
b) There is no free electrons
c) The numbers of holes are less compared to number of free electrons
d) 'Ihe number of free electrons and hole are same Contd. ...4/-
Booldet Series - B
17/B/C/S-1/4/E
30. The diode that is used for obtaining stable reference voltage is-
a) Varactor Diode b) Zener Diode
c) Tunnel Diode d) Schottky
31. The wattage range of typical soldering gun used to solder analog electronic components is-
a) 25W to loow b) 250W to 500W
c) loow to 500W d) 250W to looow
32. IC 723 is a-
a) Fixed output voltage regulator b) Variable output voltage regulator'
c) Operational Amplifier d) Voltage controlled Oscillator
33. Right click an item in desktop using a mouse results in-
a) Display a list of things we can do with the item
b) Select the item
c) Open.the item
d) Close 'the item
34. The port through which most of the modern devices like external hard disk, printer, scanner and mouse can be connected is-
a) PS/2 port b) Parallel port c) USB port d) VGA port
35. Modems are connected to computer through-
a) USB port b) VGA port c) Centronics port d) RJ45 port
36. In MS-WORD, if you need to change the typeface and character size of a document, which menu you will choose-
a) Edit b) View c) Format d) Tools
37. In MS-WORD pressing F8 key for three times select-
a) A paragraph b) A sentence
c) A word d) Entire Document
38. In MS-WORD, from which menu you can insert Header and Footer-
a) Format b) View c) Tools d) Insert
39. Which option in EXCEL can be used to split windows into two?
a) Format->Window b) View->Window->Split
c) Window->Split d) View->Split
40, In EXCEL getting data from a cell located in a different sheet is called as-
a) Accessing b) Referencing
c) Updating d) Data Acquiring
41. The computer network cable that supports very high data rates and least affected by electromagnetic radiation is-
a) Coaxial cable b) Shielded twisted pair
c) Wave guides d) Optical fibre cable
Contd.. ..5/
17/B/C/S-1/4/E
42. Which of the following is not an internet search engine?
a) Yahoo b) Firefox c) Bing d) MS-Access
43. The device that forward packet through appropriate to different networks is called-
a) Bridge b) Router
c) Hub d) Transponder
44. In an RL series circuit.
0 1800
a) Current lags voltage by less than 90 b) Current lags voltage by
c) Current lags voltage by 900 d) Current leads voltage by less than 900
45. Which of the following capacitor is suitable for DC filter circuits?
a) Mica b) Ceramic
c) Paper d) Electrolytic
46. Thé peak inverse voltage of a full wave centre tapped rectifier ciicuit is equal to of the input signal.
a) Thrice the peak b) Twice the peak
c) One half the peak d) One third the peak
47. Which of the following devices can be used to protect devices from sudden voltage variations?
a) Tunnel Diode b) Switching Diode
c) Varactor Diode d) Schottky Diode
48. When electric field in the depletion region of a PN junction increases to the point where it can break the covalent bonds and generate electron-hole pairs, we cåll it as-
a) Avalanche break down b) Zener break down
c) Diffusion break down d) Covalent break down
49. In a material if the number of valence electrons of an atom is less than 4, then the material is called as-
a) Conductor b) Insulator
c) Semiconductor d) None of these
50. Resistors with colour bands in body are generally-
a) Wire wound resistors b) Carbon compound resistors
c) Potentiometers d) Rheostat
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