| Post Name | Tradesman (Electronics)- Technical Education |
|---|---|
| Question Paper Code | 037/2024 |
| Category Code | 427/2023 |
| Date of Test | 12 April 2024 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
The analysis of static electric charges and their forces is/are called :
Answer
B. Electrostatics
2
Which one of the following statement is true for three phase AC supply?
Answer
A. Reduction of copper consumption
3
For sinusoidal AC, Ratio of effective value to average value of half cycle is termed as :
Answer
D. Form factor
4
Which one of the following statement is not the main characteristics of parallel resonance
circuit at resonance?
Answer
C. Voltage leading with current
5
As in the case of moving iron instruments the deflecting torque is proportional to :
Answer
A. Square of the magnetic force
6
In a forward biased PN junction -
(i) The width of depletion region is reduced
(ii) The junction offers low resistance
(iii) The magnitude of current depends on the applied voltage,
Which statement / statements is / are correct?
Answer
C. All are correct
7
When select source of trigger signal as internal (INT) in CRO, from where the Trigger signal
is generated?
Answer
B. Part of the signal to be viewed
8
Which one of the following is not an effect of open circuit in a series connected circuit?
Answer
D. High current flows in the circuit
9
Capacitors are electronic components which can store electric energy in the form of :
Answer
A. Electric charge
10
The statement(s) which is/are correct for both series and parallel combination of resistances?
(i) The total resistance is the sum
(ii) The applied voltage is same across each resistor
(iii) Total power is equal to the sum of power dissipated by each resistor
Answer
D. (iii) only
11
Transformer cannot transfer DC energy from primary to secondary because :
Answer
C. DC cannot produce changing magnetic field
12
The degree to which any transformer approaches the ideal condition is called :
Answer
A. Efficiency
13
The DC output voltage in terms of peak value of secondary voltage (Vs peak) in Half wave
rectifier is :
Answer
B. 0.318 Vs peak
14
Zener diodes are :
Answer
C. Heavily dopped with sharp break down voltage in reverse biased condition
15
The PMMC instruments has uniform scale and can cover an arc up to :
Answer
B. 270 degree
16
Auto Transformers used for variable voltage operation are referred to the trade name of :
Answer
D. VARIAC
17
Thin film resistors are made by a method of vacuum deposition-the resistive material onto an
insulating substrate - The process is called :
Answer
A. Sputtering
18
The value of time constant (RC) at which the charging or discharging of capacitor is complete,
as per universal time constant curve :
Answer
B. 5 RC
19
The value of capacitor should not be excessively large, as this will increase the value and
duration of which quantity in the case of bridge rectifier?
Answer
D. Surge current
20
In a Transformer, the power loss due to eddy current is directly proportional to :
Answer
D. None of these
21
Impurity used for making P-type semiconductor material :
Answer
B. Gallium
22
The space charge region in a junction diode contains charges that are :
Answer
C. Fixed donor and acceptor ions
23
Forbidden energy gap in semiconductors :
Answer
A. lies between valence band and conduction band
24
When a PN junction is reverse biased, then the junction capacitance is :
Answer
C. increases as the reverse bias is decreased
25
What is the process of adding impurities to a pure semi conductor material?
Answer
A. Doping
26
In half wave rectifier DC output voltage in terms of Vs(rms) :
Answer
A. 0.45 Vs (rms)
27
Which parameter is maintained constant in Zener diode?
Answer
C. Voltage
28
What is the formula used to calculate the current gain ( α ) of common base amplifier?
Answer
D. IC ÷ IE
29
Transistors packaging generally used for low power amplification :
Answer
B. Plastic packaging
30
If the operating point in a transistor changes, then it results in :
Answer
B. Unfaithful amplification
31
In a transistor, which layer is heavily doped?
Answer
A. Emitter
32
The current ICBO flows in :
Answer
A. Collector and Base leads
33
The Emitter resistor RE bypassed by a Capacitor :
Answer
D. stabilizes the Q point
34
The most cost effective material for a heat sink is :
Answer
A. Aluminum
35
What is the package type for the JFET BFW10?
Answer
D. TO-72
36
What are the terminals in IGBT?
Answer
A. Emitter, Collector and Gate
37
TRIAC is very similar to that of two SCR connected in :
Answer
C. Reverse parallel
38
The output characteristics of a FET are similar to that of ––––––––– valve.
Answer
C. Pentode
39
SCR is an acronym for :
Answer
A. Silicon Controlled Rectifier
40
A DIAC has ––––––––– terminals.
Answer
B. 2
41
A UJT is switched on when input voltage becomes equal to :
Answer
A. Peak point voltage
42
Which insulation material is used in a MOSFET?
Answer
B. Silicon dioxide
43
When a transistor is in Cut off, the VCE is approximately equals to
Answer
C. VCC
44
The gain of amplifiers falls at lower and higher frequencies due to
Answer
A. Capacitor Coupling
45
For ––––––––– frequency amplification high values of L and C are required.
Answer
D. Low
46
In a parallel resonant circuit, the impedance is ––––––––– at resonance frequency.
Answer
B. Maximum
47
Rate of Change of the output voltage of op-amp is called :
Answer
B. Slew rate
48
Which of the following Statement(s) is/are correct about instrumentation amplifiers?
(i) High gain accuracy
(ii) High CMRR
(iii) High noise
(iv) Low input impedance
Answer
A. Only (i) and (ii)
49
Which of the following Statement(s) is/are correct about an ideal op-amp?
(i) Zero input impedance
(ii) Infinite band width
(iii) Infinite output impedance
(iv) Zero offset
Answer
D. Only (ii) and (iv)
50
For a common base amplifier which of the following statement (s) is/are wrong?
(i) Low input impedance
(ii) Low output impedance
(iii) High current gain
(iv) Very High voltage gain
Answer
Question Cancelled
51
In a 3 i/p NAND gate, the number of states where output is 0 are :
Answer
C. 1
52
DCVS means
Answer
Question Cancelled
53
Medium Scale Integration contains
Answer
B. 10 to 100 gates
54
The number of loads connected to a gate is called :
Answer
A. Fan out
55
The speed of the low power Schottky is :
Answer
A. 10 ns
56
In a 4 line to 16 line decoder ––––––––– number of decoding gates are required.
Answer
C. Sixteen
57
––––––––– gate is used as a parity checker.
Answer
D. EX-OR
58
A decade counter requires ––––––––– flipflops.
Answer
B. Four
59
IC 74198 is :
Answer
D. PIPO
60
The binary equivalent of a decimal fraction is obtained by ––––––––– the number
continuously by 2.
Answer
A. Multiplying
61
The number of AND gates in IC 7411 is :
Answer
C. 3
62
The maximum number of 2 i/p NAND gates required to implement a 2 i/p X-OR is :
Answer
Question Cancelled
63
How many types of number systems are there?
Answer
D. Four
64
The select lines required for an 8 line to 1 line multiplexer is :
Answer
C. 3
65
The number of i/p’s required for a 4 to 16 decoder is :
Answer
B. 4
66
Which of the following decodes and executes instructions stored in memory?
Answer
B. Control Unit
67
Which of the following statement is/are correct about Microsoft Word?
(i) Ctrl+F can be used to insert navigation pane
(ii) Cross references are inserted as hyperlinks by default.
(iii) Same letter cannot be send to multiple recipients by using mail merge.
Answer
B. Only (i and ii)
68
Which of the following option displays pages exactly as they will appear in printouts in
Microsoft excel?
Answer
B. Page layout view
69
Which of the following protocol is/are operate at the Transport layer?
(i) TCP
(ii) IP
(iii) UDP
Answer
D. Only (i and iii)
70
Which of the following networking devices can connect multiple wired or wireless networks
together?
Answer
D. Router
71
Which among the following is the maximum safe current that can pass continuously through
a fuse without overheating?
Answer
C. Current rating
72
What is the power rating of fractional horse power motors?
Answer
A. Less than 1HP
73
In which of the following arrangement the centrifugal switch is connected in a capacitor-start
induction-run motor?
Answer
B. Series with the starting winding
74
Which motors are used widely in industries and in irrigation pump sets where fairly constant
speed with high efficiency is required?
Answer
A. Squirrel cage induction motors
75
Which of the following statement is/are correct?
(i) The current rating of rewirable fuse used for domestic wiring is upto 200 A
(ii) The current rating of catridge type fuse used for domestic wiring is upto 1250 A
(iii) The current rating of rewirable fuse used for domestic wiring is upto 200 mA
(iv) The current rating of catridge type fuse used for domestic wiring is upto 1250 mA
Answer
C. Only (i) and (ii)
76
What is the propagation speed of a radio wave?
Answer
A. 3 × 10⁸ m/s
77
What is the range of medium wave frequency in AM broadcasting?
Answer
C. 530 KHz - 1650 KHz
78
Which high gain antenna is used for point -to-point communication?
Answer
C. Parabolic antenna
79
Why the modulation index is kept within limits in AM modulated signal transmission?
Answer
C. To reduce distortion
80
Which IC can be used as a linear amplitude modulator with no external components?
Answer
D. AD 633
81
Which process in digital signal processing is the mapping of a large set of input values to a
smaller set?
Answer
A. Quantization
82
Which devices are preferred for long distances and high data transmission rate in optical
fiber communication?
Answer
D. LASER diode
037/2024 12 A
83
Which type of optical fiber is used in Telephone and Television signal communication?
Answer
B. Single mode optical fiber
84
Which outer optical material of the OFC protects the core and reflects the light back into the
core?
Answer
C. Cladding
85
Which theorem provides a prescription for the nominal sampling interval required to avoid
aliasing?
Answer
D. Nyquist Sampling Theorem
86
How many pins of the microcontroller IC 8051 are dual purpose?
Answer
Question Cancelled
87
Which section in IC 8051 is running on external clock source?
Answer
C. Counter
88
How the MCS-51 family microcontrollers perform the basic logic operations?
Answer
C. On both bit and byte Operands
89
In which instruction set of 8051 microcontroller, the Address-object instructions are grouped?
Answer
A. Data Transfer
90
What is the purpose of connecting a divide by 12 network to the oscillator output in 8051
microcontroller?
Answer
Question Cancelled
91
The sensor which detect the presence of objects without any physical contact is :
Answer
C. Proximity sensor
92
The device which is used to convert force into electrical signal is :
Answer
A. Load cell
93
PT100 sensor has a resistance of :
Answer
B. 100 Ω at 0°C
94
A strain gauge having a resistance of 500 Ω and gauge factor 3 is bonded on to a member of
structure under tensile stress. The percentage strain suffered by the member if the change in
resistance of the gauge is accurately measured as 1.5 Ω is :
Answer
A. 0.001
95
The resistance hygrometer is used to measure :
Answer
B. Relative humidity
96
The specific gravity of lead acid battery under discharged condition is :
Answer
Question Cancelled
97
The diode connected in opposite and parallel with solar panel to protect the from any damage
is :
Answer
D. Bypass diode
98
The power device is used for switching purpose in computer SMPS is :
Answer
A. MOSFET
99
The forward converter type SMPS is :
Answer
C. DC to DC Buck converter
100
The transformer used in servo voltage stabilizer is :
Answer
B. Toroidal auto transformer
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