| Post Name | JUNIOR INSTRUCTOR(Technician Power Electronics System-TPES) - INDUSTRIAL TRAINING |
|---|---|
| Question Paper Code | 125/2023 |
| Category Code | 555/2021 |
| Date of Test | 21 July 2023 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
What is the shape of mandatory signs ?
Answer
B. Circular
2
What is the reason for electric fire ?
Answer
C. Overloading
3
Which fire extinguisher is used to put off class βCβ type of fire ?
Answer
Question Cancelled
4
Which artificial respiration method to be avoided to a person with abdomen injury ?
Answer
A. Schaferβs method
5
Which method is used for blanketing with foam to extinguish the fire ?
Answer
C. Smothering
6
Which electrical quantity is directly proportional to the current carrying capacity of
the conductor ?
Answer
B. Passing current
7
EmF of a Cell does not depends on
Answer
A. Nature of electrolyte
8
What is the relation between phase voltage and line voltage in a delta system?
Answer
A. V_L = V_PH
9
How many gauge numbers in SWG, changed to double the cross section area of the
conductor ?
Answer
B. Three gauge sizes decreased
10
Which metal has very good conductivity to the electric current ?
Answer
C. Silver
11
Which of the following capacitors can have the Highest Capacitance Value ?
Answer
D. Electrolytic
12
Ferrite Cores are used for
Answer
Question Cancelled
13
A Resistor has colour code bands Brown, Black, Green and Gold, its nominal value is
Answer
Question Cancelled
14
Neutral Atom must have the same no. of
Answer
B. Protons and Electrons
15
diameter of a Copper wire is doubled, its current carrying capacity becomes
Answer
A. Four times
16
ln a Zener diode shunt voltage regulator, the diode regulates so long as it is kept in
_____________ Conduction.
Answer
B. Reverse
17
ln a parallel circuit all components must
Answer
A. Have the same potential difference across them
18
Primary advantage of crystal oscillator is that
Answer
C. lts frequency of oscillation remains almost constant
19
ln a N channel JFET, if the Gate voltage Vgs is made more negative, then
Answer
B. Channel conductivity decreases
20
What is the range of temperature setting on soldering work station for soldering Smd lCs ?
Answer
C. 250Β° C to 280Β° C
21
Which material is used to make the drill bits for drilling PCB holes ?
Answer
Question Cancelled
22
What is the purpose of providing solder mask on the PCBs ?
Answer
D. Prevent solder bridges
23
Which of the following devices does not have negative Resistance characteristics ?
Answer
Question Cancelled
24
Varactor diode is used for
Answer
A. Electronic tuning
25
ln an oscillator, the feedback signal is
Answer
A. in phase with input signal
26
The current through the SCR can be turned off by
Answer
A. Reducing the current through SCR below holding current
27
SCR has
Answer
C. 3 leads, 4 layers
28
The equivalent circuit of TRIAC is
Answer
B. Two SCR connected in inverse parallel with common gate
29
The TRIAC can be triggered into conduction by
Answer
D. Positive or negative gate signal
30
IGBT has
Answer
D. Both
31
Three terminals of IGBT
Answer
B. Gate, emitter, collector
32
While testing a dIAC using multimeter, it should show,
Answer
C. Infinite resistance in either direction
33
dIAC exhibits negative resistance characteristics at
Answer
A. Break over voltage
34
The snubber circuit is used,
Answer
C. To avoid false triggering of TRIAC
35
The application of SCR is
Answer
A. To control the amount of power delivered to the load
36
Which of the following is a bidirectional device ?
Answer
B. TRIAC
37
The insulating layer in mOSFET is made of
Answer
D. Silicon dioxide
38
Which of the following is a current driven device ?
Answer
A. BJT
39
The short cut for shut down the computer is
Answer
A. Alt + F4
40
Which is the primary memory ?
Answer
C. RAm
41
Typical forward voltage drop of red lEd is
Answer
D. 1.8 V
42
The rate of change of output voltage in operational amplifiers is called
Answer
B. Slew rate
43
DC value of the pulsating output in a half-wave rectifier is:
Answer
B. V_dc = 0.318 V_peak
44
lf input AC wave have frequency of 50 Hz applied to fullwave rectifier, the output
frequency of the pulsating dC will be
Answer
D. 100 Hz
45
Peak inverse voltage across the diode in a half wave rectifier with capacitor input
filter is
Answer
C. 2 Vm
46
The type code printed on a zener diode is BZC9V1, βBβ stands for
Answer
A. Silicon
47
Pin number 2 of timer lC 555 is
Answer
D. Trigger
48
The reverse leakage current in a silicon diode,
Answer
A. doubles for each 10Β° C rise in temperature
49
Arsenic is
Answer
C. donor impurity
50
Air core transformers used in high frequency application because
Answer
C. these will have no iron loss
51
In digital Storage Oscilloscope, the purpose of sampling is
Answer
B. convert analog signal to digital signal
52
Which function makes a stable waveform displayed on the dSO screen ?
Answer
A. Auto set function
53
The overall operations of the digital storage oscilloscope is controlled by
Answer
D. using microprocessors
54
What is the advantage of the dSO ?
Answer
C. store digital data for later viewing
55
Which part of the dSO store the processed data of input signal voltage ?
Answer
A. memory
56
The function performed by the sample/hold circuit along with the AdC in digital storage
oscilloscope is
Answer
C. data acquisition
57
Which circuit is used in digital storage oscilloscope to convert the input sample voltage
into digital information ?
Answer
B. Analog to digital converter circuit
58
For commercial purposes, the digital storage oscilloscope will allows up to
Answer
D. 40 channel
59
What is the bit size of the 8051 micro controller ?
Answer
C. 8 bit
60
Name the architecture and instruction set used for mC 51.
Answer
B. Harvard architecture with CISC instruction set
61
The number of input/output ports in 8051microcontroller
Answer
A. 4 ports
62
βSCONβ in serial port is used for which operation ?
Answer
C. Controlling data
63
The function of the program counter is
Answer
D. Address of the next instruction
64
From the list, what is the order of the assembly and running of 8051 program ?
i. Myfile.asm
ii. Myfile.lst
iii. Myfile.obj
iv. Myfile.hex
Answer
A. i ii iii iv
65
Which pin provides a βRESETβ option in MC51 ?
Answer
B. Pin 9
66
External Access (EA) is used to permit
Answer
D. memory interfacing
67
What is the operation performed by the following assembly language Program of mC 51 ?
ClR A
mOV R1, #100H
mOV R7, #21H
AGAIN : mOV
Answer
A. R1, A
INC R1
dJNC R7, AGAIN
68
What is the address range of SFRs ?
Answer
C. 80H to FFH
69
A three phase full wave fully controlled bridge uses
Answer
D. 6 SCRs
70
A diac-triac built in the same chip is called
Answer
B. quadrac
71
A freewheeling diode is used in a controlled rectifier circuit in case of
Answer
C. inductive loads
72
From the following list, a dC chopper circuit control can be adopted by
i. keeping TON constant and varying TOFF
ii. keeping TOFF constant and varying TON
iii. varying [TON/TOFF] ratio
Answer
A. i and ii
73
The heart of an inverter is the
Answer
A. oscillator circuit
74
Thermistor is a transducer which converts
Answer
C. temperature into equivalent electrical signal
75
Which one of the following is a measure of purity of the power output of power supply ?
Answer
B. Ripple factor
76
What will be the backup time of a UPS if it is backed by 150AH, 12V battery driving
a load of 150W ?
Answer
A. 12 hours
77
The working of SmPS is based on
Answer
D. Chopper Principle
78
The most suitable device for high frequency inversion in SmPS is
Answer
C. mOSFET
79
In optical fibers, Rayleigh Scattering is proportional to
1 1 1 1
Answer
D. =
) 5 ) )
80
Optical fiber works on the phenomenon of
Answer
A. Total Internal Reflection
81
Which type of mechanical splicing exhibits the permanent binding of prepared fiber
ends with the rigid alignment of the tube ?
Answer
A. Snug tube splicing
82
The macroscopic bending losses show an exponential increase due to __________
in radius of curvature.
Answer
B. decrease
83
The starting torque of dC motor is Independent of
Answer
A. Speed
84
Servo motor has ________ terminals.
Answer
C. Three
85
Which of the following statements related to Servo motor is incorrect ?
Answer
B. It is inexpensive and widely available
86
large number of narrow slots in stator of an AC motor is preferred because
Answer
C. large number of narrow slots reduces noise and tooth pulsation losses
87
Armature voltage control of dC motor will provide
Answer
C. Constant torque drive
88
Which actuator does not need any external power source ?
Answer
C. Wax motor
89
Which valve should be used if there is a need of fluid to flow in 4 direction ?
Answer
A. Spool valve
90
The small section of fibre which is coupled to the optical source is known as
Answer
C. Both
91
Which is a Electro pneumatic device ?
Answer
C. Hydraulic cylinder
92
How many directions are there for a fluid to flow in shuttle valves ?
Answer
B. 2
93
The PLC is classified in to
Answer
B. Two
94
Which is the first PLC model ?
Answer
A. PlC 084
95
How many operations the PlC have ?
Answer
Question Cancelled
96
_________ are the components that are required to change or create a program.
Answer
Question Cancelled
97
PLCβs can be programmed in
Answer
D. All of the above
98
The relays consists of
Answer
C. Both
99
The components that make PlC works can be divided in to ________ core areas.
Answer
C. Three
100
Which are known as poppet valves ?
Answer
A. SEAT valves
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