Electrician theory sem 4 july 2015 questions
Which element is used as a semi conductor?
A Copper B Silver C Silicon D Aluminium
The number of valance electrons of the germanium element is.................
A 5 B 4 C 3 D 2
Name the element used as impurity to produce 'N'- type semi conductor?
A Gallium B Boron C Aluminium D Arsenic
The barrier potential voltage of silicon element is................
A 0.7 volt B 0.6 volt C 0.5 volt D 0.3volt
In diode, the current, which can allow to flow through it without getting damaged is called as.............
A maximum reverse current B maximum average forward current
C maximum forward surge current D maximum load current
In diode terminology PIV stands for
A Peak Instantaneous Voltage B Polarity Identification Value
C Peak Inverse Voltage D Peak Inverse Value
Which type of diode is used in Radio receivers?
A Signal diodes B Switching diodes
C Point contact diodes D High power diodes
Aa per the PRO ELECTRON type coding, one diode is specified as 'BY127'. In this, what dose the letter T indicate?
A Power diode B Rectifier diode C Signal diode D Junction diode
if the input AC voltage is 30 volts, then the output D.C voltage of the half wave rectifier will be...............
A 30.0 volt B 27.0 volt C 13.5 volt D 10.8 volt
if the input AC frequency is 50 Hz then the output ripple frequency of the bridge rectifier is.........
A 50 Hz B 100 Hz C 150 Hz D 200 Hz
Which type of filter can be used together with a full wave rectifier only?
A Series Inductor filter B Pi filter (n) C RC filter D Choke input LC filter
What is the forward voltage drop of single green colour LED is..................
A 1.8 volt B 2.0 volt C 2.2 volt D 2.1 volt
Which one is the application of high power transistor?
A Microphone B Loud speaker C Tape recorder D Transducers
A transistor is designated as '2N 3055'. What does '2N' indicate?
A Indicates as diode
B Indicates the number of terminals
C Indicates the field effect transistor
D Indicates thetwo junction device (transistor)
In common emitter amplifier the output characteristic curves can be obtained by plotting...................
A lc on the 'Y' axis Vs VCE on the 'X' axis
B lB on the Y axis Vs V6E on the 'X' axis
C Vbe on the Y axis Vs le on the Y axis
D VCE on the Y axis Vs lc on the Y axis
Which type of transistor biasing in commonly used in digital circuits?
A Self bias B Base bias C Voltage divider bias D Emitter bias
The power gain (Ap) of amplifier is often expressed in..........
A milliwatts B watts C decibel D percentage
The emitter follower configuration is frequently used as..................
A an amplifier circuits B switching circuits
C negative feed back circuit D an impedance matching circuit
One of the application of class - A amplifier is...............
A audio power amplifier circuit B micro phone C tape recorder D radio receiver
One of the disadvantages of the class - B push pull amplifier is....................
A the single ended input and output B the positive half cycle only get amplified
C having a cross - over distortion D having centre tapped drive transformer
If the output of the oscillator is non-sinusoidal wave form then, the type of oscillator is known as..................
A relaxation oscillators B harmonic oscillators
C colpitt's oscillators D hartley oscillator
Which type of oscillator is used in broad cast transmitters?
A Hartley oscillator B Crystal oscillator
C R-C phase shift oscillator D Colpitt's oscillator
The free running multi - vibrator is also known as...............
A bistable multi vibrator B mono - stable multi vibrator
C astable multi-vibrator D mono -shot
The noise in operational amplifiers can be reduced by...............
A applying dual DC power supply
B applying single D.C power supply
C increasing the value of input resistor to large values
D shortening the interconnecting wire lengths
The gain of an op - amp. is specified at different frequencies is termed as.........
A frequency gain B gain - band width - product C band width gain D op - amp. Voltage gain
The application of UJT is..........
A filter circuits B power amplifier C relaxation oscillator D sinusoidal oscillator
The material is used in solar cell as positive output terminal is................
A nickel plated ring B chromium plated ring C silver coated ring D zinc plated ring
What are the terminal markings in TRIAC?
A Source (S), Gate (G), Drain (D)
B Main terminal -1 (MT1, Main terminal - 2 (MT2) Gate (G)
C Base (B), Collector (C), Emitter (E)
D Anode (1), Anode (2)
FET (Field Effect Transistor) is also known as.............
A bi-polar transistor B unipolar transistor
C current controlled device D power controlled device
GTO stands for..............
A Gated Tuned - off Thyristor B Gate Turn - off Thyristor
C Gain Triggered - off transistor D Gate Triggering - off Thyristor
One of the application of GTO is.............
A high power amplifier B signal diodes C induction heating D oscillators
IGBT stands for..............
A Integrated Gate Bipolar Transistor B Intrinsic Gallium Bipolar Thyristor
C Insulated Gate Bipolar Transistor D Integrated Gain Bipolar Thyristor
One of the application of IGBT is.....
A inverters B multi vibrators C amplifiers D loudspeaker
The current through the load in SCR: wnich is below the critical value Is called as........
A gate current B forwarded current C holding current D load current
The main application of SCR is.............
A the speed control of motors B the voltage amplifier circuits C the filter circuits D the oscillator circuits
In MOSFET, the insulating layer is generally made of...................
A galiium dioxide B silicon dioxide C germanium plate D bismuth piate
SCR stands for................
A Semi Conductor Rectifier B Speed Controlled Rectifier
C Special Conductor Rectifier D Silicon Controlled Rectifier
The speed of the A.C motors using SCR can be controlled by varying..................
A the holding current of SCR B the firing angle of the SCR
C the load current D the gate current
In IC type, voltage regulator, it is designated as 7805'. What does the number 78l indicate?
A The positive output regulator B The negative output regulator
C The input positive voltage D The output negative voltage
In a on - line UPS system, The switch over time from mains to battery is.................
A 10 milli sec B 9 milli sec C 8 milli sec D zero
In Binary number '0100' is equal to the decimal number is....................
A 1 B 2 C 3 D 4
The decimal number '8' is equal to the binary number is....................
A 1000 B 1001 C 0111 D 0110
in Hexadecimal number system the base number is.........
A 6 B 12 C 16 D 18
In Hexadecimal number system the letter 'D' indicates the decimal number is.........
A D=14 B D=13 C D=12 D D=11
The pre-dominant binary coded decimal code is...........
A 1248 B 2481 C 4286 D 8421
If the inputs of the 'OR' gate are 'A&B', then the output (y)=..........
A y = A.B B y = A-B C y = A+B D y= AB
In J&K flip-flops the 16 clock pulse dives Q=..........
A 1111 B 0000 C 1001 D 1010
What are the two inputs (A&B) of the 'NOR' gate, if the output (y)=1?
A A=0;B=0 B A=0;B=1 C A=1;B=0 D A=1;B=1
Which element is used as a semi conductor?
A Copper B Silver C Silicon D Aluminium
The number of valance electrons of the germanium element is.................
A 5 B 4 C 3 D 2
Name the element used as impurity to produce 'N'- type semi conductor?
A Gallium B Boron C Aluminium D Arsenic
The barrier potential voltage of silicon element is................
A 0.7 volt B 0.6 volt C 0.5 volt D 0.3volt
In diode, the current, which can allow to flow through it without getting damaged is called as.............
A maximum reverse current B maximum average forward current
C maximum forward surge current D maximum load current
In diode terminology PIV stands for
A Peak Instantaneous Voltage B Polarity Identification Value
C Peak Inverse Voltage D Peak Inverse Value
Which type of diode is used in Radio receivers?
A Signal diodes B Switching diodes
C Point contact diodes D High power diodes
Aa per the PRO ELECTRON type coding, one diode is specified as 'BY127'. In this, what dose the letter T indicate?
A Power diode B Rectifier diode C Signal diode D Junction diode
if the input AC voltage is 30 volts, then the output D.C voltage of the half wave rectifier will be...............
A 30.0 volt B 27.0 volt C 13.5 volt D 10.8 volt
if the input AC frequency is 50 Hz then the output ripple frequency of the bridge rectifier is.........
A 50 Hz B 100 Hz C 150 Hz D 200 Hz
Which type of filter can be used together with a full wave rectifier only?
A Series Inductor filter B Pi filter (n) C RC filter D Choke input LC filter
What is the forward voltage drop of single green colour LED is..................
A 1.8 volt B 2.0 volt C 2.2 volt D 2.1 volt
Which one is the application of high power transistor?
A Microphone B Loud speaker C Tape recorder D Transducers
A transistor is designated as '2N 3055'. What does '2N' indicate?
A Indicates as diode
B Indicates the number of terminals
C Indicates the field effect transistor
D Indicates thetwo junction device (transistor)
In common emitter amplifier the output characteristic curves can be obtained by plotting...................
A lc on the 'Y' axis Vs VCE on the 'X' axis
B lB on the Y axis Vs V6E on the 'X' axis
C Vbe on the Y axis Vs le on the Y axis
D VCE on the Y axis Vs lc on the Y axis
Which type of transistor biasing in commonly used in digital circuits?
A Self bias B Base bias C Voltage divider bias D Emitter bias
The power gain (Ap) of amplifier is often expressed in..........
A milliwatts B watts C decibel D percentage
The emitter follower configuration is frequently used as..................
A an amplifier circuits B switching circuits
C negative feed back circuit D an impedance matching circuit
One of the application of class - A amplifier is...............
A audio power amplifier circuit B micro phone C tape recorder D radio receiver
One of the disadvantages of the class - B push pull amplifier is....................
A the single ended input and output B the positive half cycle only get amplified
C having a cross - over distortion D having centre tapped drive transformer
If the output of the oscillator is non-sinusoidal wave form then, the type of oscillator is known as..................
A relaxation oscillators B harmonic oscillators
C colpitt's oscillators D hartley oscillator
Which type of oscillator is used in broad cast transmitters?
A Hartley oscillator B Crystal oscillator
C R-C phase shift oscillator D Colpitt's oscillator
The free running multi - vibrator is also known as...............
A bistable multi vibrator B mono - stable multi vibrator
C astable multi-vibrator D mono -shot
The noise in operational amplifiers can be reduced by...............
A applying dual DC power supply
B applying single D.C power supply
C increasing the value of input resistor to large values
D shortening the interconnecting wire lengths
The gain of an op - amp. is specified at different frequencies is termed as.........
A frequency gain B gain - band width - product C band width gain D op - amp. Voltage gain
The application of UJT is..........
A filter circuits B power amplifier C relaxation oscillator D sinusoidal oscillator
The material is used in solar cell as positive output terminal is................
A nickel plated ring B chromium plated ring C silver coated ring D zinc plated ring
What are the terminal markings in TRIAC?
A Source (S), Gate (G), Drain (D)
B Main terminal -1 (MT1, Main terminal - 2 (MT2) Gate (G)
C Base (B), Collector (C), Emitter (E)
D Anode (1), Anode (2)
FET (Field Effect Transistor) is also known as.............
A bi-polar transistor B unipolar transistor
C current controlled device D power controlled device
GTO stands for..............
A Gated Tuned - off Thyristor B Gate Turn - off Thyristor
C Gain Triggered - off transistor D Gate Triggering - off Thyristor
One of the application of GTO is.............
A high power amplifier B signal diodes C induction heating D oscillators
IGBT stands for..............
A Integrated Gate Bipolar Transistor B Intrinsic Gallium Bipolar Thyristor
C Insulated Gate Bipolar Transistor D Integrated Gain Bipolar Thyristor
One of the application of IGBT is.....
A inverters B multi vibrators C amplifiers D loudspeaker
The current through the load in SCR: wnich is below the critical value Is called as........
A gate current B forwarded current C holding current D load current
The main application of SCR is.............
A the speed control of motors B the voltage amplifier circuits C the filter circuits D the oscillator circuits
In MOSFET, the insulating layer is generally made of...................
A galiium dioxide B silicon dioxide C germanium plate D bismuth piate
SCR stands for................
A Semi Conductor Rectifier B Speed Controlled Rectifier
C Special Conductor Rectifier D Silicon Controlled Rectifier
The speed of the A.C motors using SCR can be controlled by varying..................
A the holding current of SCR B the firing angle of the SCR
C the load current D the gate current
In IC type, voltage regulator, it is designated as 7805'. What does the number 78l indicate?
A The positive output regulator B The negative output regulator
C The input positive voltage D The output negative voltage
In a on - line UPS system, The switch over time from mains to battery is.................
A 10 milli sec B 9 milli sec C 8 milli sec D zero
In Binary number '0100' is equal to the decimal number is....................
A 1 B 2 C 3 D 4
The decimal number '8' is equal to the binary number is....................
A 1000 B 1001 C 0111 D 0110
in Hexadecimal number system the base number is.........
A 6 B 12 C 16 D 18
In Hexadecimal number system the letter 'D' indicates the decimal number is.........
A D=14 B D=13 C D=12 D D=11
The pre-dominant binary coded decimal code is...........
A 1248 B 2481 C 4286 D 8421
If the inputs of the 'OR' gate are 'A&B', then the output (y)=..........
A y = A.B B y = A-B C y = A+B D y= AB
In J&K flip-flops the 16 clock pulse dives Q=..........
A 1111 B 0000 C 1001 D 1010
What are the two inputs (A&B) of the 'NOR' gate, if the output (y)=1?
A A=0;B=0 B A=0;B=1 C A=1;B=0 D A=1;B=1
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