| Post Name | Junior Instructor (Electronic Mechanic) - Industrial Training |
|---|---|
| Question Paper Code | 081/2023/OL |
| Category Code | 333/2019 |
| Date of Test | 13 June 2023 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
Two resistors of the same value are connected in parallel and a 100V supply is connected across the terminals. If the total current taken is 10A, what is the value of each resistor?
Answer
C. 20Ω
2
Select the colour code for a resistor of value 680kΩ with ±5% tolerance from the given options.
Answer
D. Blue, Grey, Yellow and Gold
3
The reactance of a capacitor ________ with increase in frequency of the current flowing through it.
Answer
B. decreases
4
The quality factor 'Q' of a coil at resonance is 100. If the resistance of the coil is 10Ω, what is the value of it's reactance at resonance?
Answer
B. 1kΩ
5
Two capacitors 100μF each, connected in parallel are then connected in series with a third capacitor of value 200μF. What is the effective capacitance of the entire combination?
Answer
C. 100μF
6
Which of the following devices exhibits negative resistance?
Answer
D. Tunnel diode
7
Which breakdown mechanism is likely to take place in a heavily doped PN junction diode?
Answer
B. Zener breakdown
8
Which of the following statements are not correct for a JFET? (i) It is a bipolar device (ii) It has high input impedance (iii) It is a current controlled device (iv) Small in size compared to BJT
Answer
D. (i) and (iii)
9
The arrow pointer on a transistor symbol indicates
Answer
C. direction of hole current
10
For the operation of n-channel E-MOSFET, the gate voltage must be
Answer
C. high positive
11
Which of the following is an adjustable voltage regulator IC?
Answer
B. LM317
12
The forbidden energy gap of Silicon at room temperature is
Answer
A. 1.12 eV
13
A heavily doped p-type semiconductor material is
Answer
C. electrically neutral
14
At a PN-junction, electrons diffuse from the N-region to the P-region because of the
Answer
A. difference in carrier concentration
15
Which of the following statements about the leakage current in a semiconductor diode are correct? (i) Created due to the flow of majority carriers. (ii) Remains the same irrespective of the changes in biasing voltage. (iii) Varies with variation in temperature. (iv) Of the order of microamperes in silicon and nanoamperes in germanium
Answer
C. (ii) and (iii)
16
Which of the following defines base transportation factor of an NPN transistor?
Answer
A. The ratio of the number of electrons arriving at collector to the number of emitted electrons
17
Which transistor configuration has very high input resistance and very low output resistance?
Answer
C. Common Collector
18
The current gain α of a transistor is 0.99. What is the value of its β?
Answer
B. 99
19
In a BJT amplifier, the Q-point is stabilized by
Answer
C. Changing the base current to keep and constant
20
Factors that affect the lower cut-off frequency of a RC coupled CE amplifier are (i) Ineffective bypassing of emitter bypass capacitors (ii) Bypassing effect of junction capacitances (iii) Signal loss across coupling capacitors (iv) Loading effect of subsequent stages
Answer
D. (i) and (iii)
21
Which coupling scheme is preferred for a multistage amplifier used to amplify signals below 10 Hz?
Answer
A. Direct coupling
22
Which of the following oscillator circuits is suitable to generate audio frequency signals?
Answer
D. Wien bridge oscillator
23
Which of the following circuit can be used as a memory element?
Answer
B. Bistable Multivibrator
24
The differential mode gain of an op-amp is 10⁵. If the common mode gain is 0.1, what is its CMRR?
Answer
D. 10⁶
25
Which of the following is not the characteristic of an ideal op-amp?
Answer
B. Infinite output resistance
26
The electrolyte used in dry cell?
Answer
Question Cancelled
27
The specific gravity of the electrolyte in a lead acid battery can be measured using _________.
Answer
C. Hydrometer
28
Conventionally the energy stored in a battery is measured in __________.
Answer
B. Ampere - Hour
29
In a full wave rectifier if the input signal frequency is 50 Hz, find the output signal frequency?
Answer
C. 100 Hz
30
Based on the input cycles utilized, the rectifiers can be classified as __________.
Answer
D. Both (1) and (2)
31
The following symbol represents _________ in an electrical system.
Answer
Question Cancelled
32
Choose the disadvantage of SMPS:
Answer
B. Noise exist due to high frequency switching
33
The regulated DC power supply consists of ________.
Answer
D. All the above
34
The instruments used for critical load during temporary power failure occur is ________.
Answer
A. UPS
35
What is used to neutralize a spilled electrolyte from a lead acid battery?
Answer
D. Baking soda
36
The self inductance of two coils is 16 mH and 4 mH respectively. If the coefficient of coupling is 0.7, the mutual inductance between the coils is,
Answer
B. 5.6 mH
37
The voltage and current in an AC circuit are represented by v = Vₘ sin(ωt + 30°) and i = Iₘ sin(ωt − 45°). The power factor angle of the circuit is:
Answer
D. 75°
38
What is the true condition for maximum power transform from source to load as per maximum power transform theorem?
Answer
A. Source resistance is equal to load resistance
39
Power factor of a parallel resonant circuit is
Answer
C. Unity
40
Which of the following instruments measure RMS value of unknown current?
Answer
D. Both (2) and (3)
41
The energy meter installed near the main switch in residences and other locations is,
Answer
D. An integrating type instrument
42
The extension range of an ammeter and voltmeter can be made represented by,
Answer
B. Using shunt and multiplier
43
In a moving iron instrument which is spring controlled, a current of 5A produces a deflection of 60°. What will be the deflection when a current of 2A is flowing through the coil of the instrument?
Answer
A. 9.6°
44
According to Faraday's law of electromagnetic induction,
Answer
C. Electric field is produced by time varying magnetic flux
45
Which of the following is not the unit of energy?
Answer
B. Joules/second
46
The rise time 't' of a signal applied to CRO and bandwidth 'B' of the CRO are related as
Answer
A. t × B = 0.35
47
An oscilloscope is used to measure the phase difference or the frequency relationship between two unknown signals, it is used in the
Answer
D. X-Y mode
48
A triangular wave shape is obtained in a function generator
Answer
B. by integrating a square wave
49
In a digital multimeter resistance is measured by using
Answer
C. Constant current source
50
The delay line in CRO is placed after
Answer
B. Vertical amplifier
51
The recommended configuration for soldering is
Answer
C. Lap joint
52
Addition of ________ increases the mechanical property of a tin-lead solder.
Answer
A. Antimony
53
The purpose of using flux in soldering is
Answer
C. Prevents oxides forming
54
Heat for soldering process is supplied by
Answer
A. Soldering iron
55
Temperature range in soldering process is
Answer
B. 180°C - 250°C
56
Tropospheric scatter is used with frequency in the following range
Answer
A. UHF
57
The maximum power of single side band waves under distortionless condition is
Answer
C. Pc/4
58
Wide band FM is the case where the modulation index is
Answer
B. much greater than unity
59
In a super heterodyne receiver the frequency of local oscillator is
Answer
C. higher than that of incoming signal
60
In a line of sight system the receiving and transmitting antenna heights are 10m and 100m respectively above the surface of the earth. The range of the system will be approximately
Answer
D. 52 km
61
QPSK system uses a phase shift of
Answer
A. π/2
62
FDM uses ________ to prevent modulated signal from overlapping.
Answer
A. Guard band
63
A 500W carrier is amplitude modulated to a depth of 60%. What is the total power of the transmitted wave.
Answer
D. 590W
64
Which fiber is preferred for long distance communication
Answer
B. Step index single mode
65
Optical Time Domain Reflectometer is used to measure
Answer
C. Losses in optical fibre communication
66
Which of the following is the feature of mobile communication?
Answer
D. All of the above
67
The process of converting the analog sample into discrete form is called
Answer
B. Quantization
68
If physical quantities like force, tension, or pressure are to be measured, then LVDT acts as a
Answer
B. Secondary transducer
69
Identify the incorrect statement 1. LVDT gives high output value so that there is no need for any amplifier circuit for the amplification process 2. LVDT is not sensitive to stray magnetic field
Answer
B. Only statement 2
70
Which metal will have a large range of detection by inductive proximity sensor?
Answer
C. Iron
71
In semiconductor strain guage, when a tensile strain is applied,
Answer
B. Resistance increases in p-type material
72
Thermocouple works on
Answer
A. Seebeck effect
73
The temperature of steam at around 540°C can be measured by
Answer
D. Radiation pyrometer
74
In a thermistor, change in resistance is measured using a
Answer
A. Wheatstone bridge
75
Capacitive transducers can be used for the measurement of liquid level. The principle of operation used to this case is
Answer
B. Change of dielectric strength
76
Inductive transducers are mainly used for the measurement of
Answer
D. Displacement
77
Which device provides electrical isolation between input circuit and output circuit?
Answer
D. Opto coupler
78
An OR gate is equivalent to two switches connected in __________.
Answer
B. Parallel
79
The carry output of a two-input half-adder can be realised by using a _______ logic gate.
Answer
C. AND
80
The Gray code equivalent of a 4-bit binary number 1010 is ________.
Answer
B. 1111
81
The XNOR gate gives a high output when inputs are ________.
Answer
C. equal
82
Ripple counters are _________ counters
Answer
B. Asynchronous
83
Decade counter counts up to _______ states.
Answer
C. 10
84
According to De Morgan's theorem NAND gate is equivalent to ________ gate.
Answer
C. Bubbled OR
85
The number of select lines required to design an 8×1 multiplexer.
Answer
B. 3
86
A flip flop can ________ one bit of information.
Answer
A. Store
87
A _______ shift register can convert serial to parallel data.
Answer
B. SIPO
88
Which one is an Analog to Digital converter?
Answer
Question Cancelled
89
A decade counter requires ________.
Answer
A. 4 flip flops
90
Three T flip flops are connected to form a counter, how many counting sequences it can count.
Answer
D. 8
91
8086 Microprocessor is a _________ bit processor.
Answer
B. 16
92
8086 Microprocessor flag register has ________ flags.
Answer
B. 9
93
_______ flag is used for debugging in 8086.
Answer
D. TF
94
8086 can access upto _________ memory locations.
Answer
A. 1 MB
95
MOV AX, [BX] is an example of a ________ mode of addressing.
Answer
C. Register Indirect Addressing
96
8051 is a ________ bit Microcontroller.
Answer
A. 8 bit
97
Pin number 40 of the 8051 microcontrollers is _________.
Answer
B. VCC
98
Microcontrollers have no ________ flag.
Answer
D. Zero
99
The Serial data communication in 8051 is controlled by _________ registers.
Answer
A. SCON
100
8051 Microcontroller have _________ interrupt signals.
Answer
D. 5
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