| Post Name | TRADESMAN (Electronics) |
|---|---|
| Department | TECHNICAL EDUCATION |
| Question Paper Code | 102/2022 |
| Category Code | 754/2021 |
| Date of Test | 26 October 2022 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
The resistance between the opposite faces of a metre cube of that material is known as :
Answer
D. Resistivity
2
The ratio of the true power delivered to an AC circuit to the apparent power that the source
must supply is called :
Answer
B. Power factor
3
The power consumed in a pure capacitive circuit is :
Answer
A. Zero
4
The commercial unit of electrical energy is :
Answer
B. KWH
5
The direction of induced current is obtained by :
Answer
A. Flemingβs right hand rule
6
The resistance of a heater rated 2.2 KW and 220 v is :
Answer
D. 22 Ξ©
7
The total resistance of a parallel circuit compared to the low value of resistance connected in
the circuit is :
Answer
D. r) Equal
8
From the following which is equal to 1 Watt?
Answer
C. 1 Joule / Second
9
The SI unit of electric conductance is :
Answer
B. Siemens
10
A sine wave has a maximum value of 40 mv. The rms value of the sine wave is :
Answer
C. 28.28
11
An Oscilloscope shows 20 cycles of sine wave occurring in 2 milli seconds. The time period of
the sine wave is :
Answer
C. 0.1 milli seconds
12
In a pure parallel resonance circuit, with pure inductor and pure capacitor, at resonance the
impedence will be :
Answer
A. Infinity
13
The instrument used for measuring high voltage and high current is :
Answer
C. Instrument Transformer
14
The effect on Current Transformer
Answer
D. CT secondary winding burns out
15
The colour coding of a resistor is Blue, Red, Yellow, Gold, Gold. Itβs value is :
Answer
C. 62.4Ξ© Β± 5%
16
In an AC supply system, to improve power factor :
Answer
D. By connecting capacitor in parallel with load
102/2022 4 A
17
The following has itβs working based on electromagnetic induction :
Answer
B. Transformer
18
A static device which increases or decreases AC voltage without changing the frequency of
the supply is :
Answer
D. Transformer
19
When an alternating voltage is applied to a pure inductor, the resultant alternating current
through the inductor is :
Answer
B. Lagging by 90Β°
20
If one thousand watts lamp is used for one hour, it consumes an energy of :
Answer
A. 1 kwh
21
The working principle of single phase induction motor is :
Answer
C. Lenzβs law
22
The magnetic field produces by a single phase induction motor is :
Answer
Question Cancelled
23
In an induction motor a measure of the difference between the machineβs synchronous speed
and itβs shaft speed is :
Answer
A. Slip
24
The important property of Fuse wire is :
Answer
C. High specific resistance and low melting point
25
The fuse rating is expressed in terms of :
Answer
D. Current
26
The Maximum reverse Voltage that can be applied to the Diode without destruction is :
Answer
A. Peak Inverse Voltage
27
The PIV of Full Wave Bridge Rectifier is :
Answer
C. Vm
28
What is the Ripple factor of Half wave Rectifier?
Answer
B. 1.21
29
Both NPN and PNP Transistors are equally useful in electronics Circuits, However NPN
Transistors are :
Answer
C. Higher Switching Speed
30
The Forward Voltage Across the Base-Emitter PN Junction of Transistor is referred to as :
Answer
A. VEB
31
The Maximum Permissible Collector Current IC (max) of Transistor BC 548 is :
Answer
Question Cancelled
32
The Phase Relationship between Input and Output Wave forms in Common Emitter
Configuration is :
Answer
B. 180Β° Phase shift
33
What is the meaning of first letter indicated in the Transistor Code Number BC 107?
Answer
A. Silicon Material is Used
34
The Most Widely used type of biasing in Linear Transistor Circuit is :
Answer
C. Voltage divider Bias
35
All radios, tape recorders and Televisions invariably use Negative feedback in circuits for a
function :
Answer
B. Automatic gain Control
36
How the Maximum Permissible Collector-Base Voltage that can be Applied across
Collector-Base is?
Answer
A. VCB(max)
37
Which Type of Package is used to Transistors Utilized for medium and Power amplifications?
Answer
D. Plastic Package with Heat Sinks
38
Which Coding System for Transistor type numbering system is followed by European
Standard?
Answer
D. Pro-Electron Standard
39
The type β Code Printed on a Zener is BZC9V1, the Letter βCβ indicates is :
Answer
C. 5% Tolerance
40
JFET is Commonly Used as input amplifiers in Voltmeters, Oscilloscopes and other
Measuring Devices, due to :
Answer
C. High Input Impedance
41
What is the Package type for JFET BFW10?
Answer
A. TO-72
42
What is the term Stands for TRIAC?
Answer
C. TRIode AC Semiconductor
43
When a TRIAC is ON the Current flowing between MT1 and MT2 is known as?
Answer
C. Principal Current
44
The resistance between Anode and Cathode of SCR in Quick Test Method is :
Answer
B. Infinite Resistance
45
How many Semiconductor Layers are used in UJT Fabrication?
Answer
B. 2
46
What is the advantage of MOSFET?
Answer
B. Fast Switching Speed
47
BJT is a Current driven device, whereas IGBT is driven by :
Answer
C. Gate Voltage
48
In Common Collector Amplifier Circuit the Output is taken from :
Answer
A. Emitter
49
In a Cascaded Amplifier, the gain of 1st Stage A1 is 100, Second Stage A2 is 20, third stage
A3 is 10. The overall gain of :
Answer
D. 20,000
50
The Theoretical Efficiency of Class B Power Amplifier is :
Answer
B. 78.5%
51
What is the First Stage of OP-Amp in Block diagram?
Answer
D. Differential Amplifier
52
The Ratio of differential Voltage gain Ad to the Common Voltage gain Acm in OP-Amp is :
Answer
C. CMRR
53
In OP-Amp, Slew rate is Expressed in :
Answer
D. Volts / Microseconds
54
In IC 555, The Pin no.2 is :
Answer
B. Trigger
55
The Voltage gain of OP-Amp, as Inverting Amplifier is :
Answer
C. βRF/R1
56
ββββ are universal logic gates.
Answer
C. NAND Gate and NOR Gate
57
Which of the following is a Quad 2 input AND Gate?
Answer
B. 7408
58
The logic gate that will have HIGH or 1 at its output when any one of its input is HIGH is
a/an ββββ gate.
Answer
A. OR
59
ββββ will make an AND Gate to produce a HIGH output.
Answer
C. All inputs high
60
What is the use of Flip flop?
Answer
B. To store Binary information
61
The ability of a circuit to tolerate noise without causing unwanted changes in the output
voltage is known as :
Answer
A. noise immunity
62
A full adder circuit has :
Answer
B. 3 inputs and 2 outputs
63
Which gates are ideal for checking the parity of a binary number because they produce an
output 1 when the input has an odd no. of 1s?
Answer
C. EX-OR Gate
64
Which circuit has 2n data inputs, one data output and n control inputs?
Answer
A. Multiplexer
65
Which of the following statement is/are correct about counters?
(i) In a synchronous counter every flip flop is triggered by the clock parallel.
(ii) In an asynchronous counter the clock is applied serially.
(iii) Synchronous counters are also called as ripple counters.
Answer
A. (i) and (ii) only
66
How many inputs are available in the 7447 BCD to seven segment decoder used to drive the
LED display?
Answer
C. Four
67
The logic circuits whose output at any instant of time depends not only on the present input
but also on the past outputs are called :
Answer
D. Sequential logic circuit
102/2022 10 A
68
In RS flip flop, if Q = 0 then the output is said to be :
Answer
D. reset
69
A shift register is defined as :
Answer
C. The register capable of shifting information either to the left or to the right
70
A decade counter has ββββ states.
Answer
C. 10
71
Which circuit is used to process the demodulation of Amplitude modulated signal?
Answer
B. Envelope Detector
72
In which modulation the signal is superimposed over the carrier waves?
Answer
A. Amplitude modulation
73
Which type of antenna is used for point-to-point communication of radio waves?
Answer
D. Parabolic antenna
74
Television broadcasting is done with :
Answer
C. AM for video and FM for audio signals
75
Original signal can be obtained from sampled version using :
Answer
C. low pass filter
76
To satisfy the sampling theorem, a 200 Hz sine wave should be sampled at :
Answer
C. 400 Hz
77
In Frequency modulation :
Answer
D. all of the above
78
Optical fibers are highly immune to EMI. Which one of the following statement justifies it?
(i) They transmit signals as light rather than electric current.
(ii) They are shielded by outer conductors in cable.
(iii) Magnetic fields cannot penetrate through the glass of the fiber.
Answer
A. (i) only
79
What type of joining technique is used for fiber optic cables?
Answer
B. Fusion technique
80
Which light source is used for long distance and high data rate applications in fiber optic
communication?
Answer
D. Laser Diode
81
Which device is used to convert a physical quantity into its corresponding electrical signal?
Answer
B. Transducer
82
Which sensor detect the presence of objects without any physical contact?
Answer
D. Proximity sensor
83
Which device is used to convert force into electrical signal?
Answer
A. Load cell
84
The smallest change which a sensor can detect is known as :
Answer
D. Resolution
85
RTD stands for :
Answer
B. Resistance Temperature Detector
86
Which static device converts fixed DC input voltage into variable DC output?
Answer
C. DC chopper
87
Which power electronic device is used for switching purpose in computer SMPS?
Answer
C. MOSFET
88
What is the advantage of on-line UPS over offline UPS?
Answer
D. It is free from change over and transition problems
89
What is the function of an Inverter?
Answer
C. Converts DC voltage into AC voltage
90
Which type of solar photovoltaic electric system is designed to operate in parallel and
interconnected with the electric utility grid?
Answer
A. Grid tied system
91
How Many 16-Bit Registers are in 8051?
Answer
A. 2
92
What is bit size of 8051?
Answer
Question Cancelled
93
How many Pin are there in 8051?
Answer
C. 40
94
How many bytes of bit addressable memory is present in 8051?
Answer
B. 16
95
Which is the reset pin in 8051?
Answer
D. 9
96
Which of the following is input devices?
Answer
C. Keyboard
97
What is BIOS?
Answer
D. firmware
98
Which short cut is used to Align Selected text to center?
Answer
A. Ctrl + E
99
How Many Layers in OSI Refences Model?
Answer
B. 7
100
What is the Full Form of FTP?
Answer
D. File Transfer Protocol
ββββββββ
102/2022 14 A
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