| Post Name | Demonstrator in Electronics and Instrumentation & Demonstrator in Instrument Technology |
|---|---|
| Department | Technical Education |
| Question Paper Code | 129/2022 |
| Category Code | 295/2021 |
| Date of Test | 22 December 2022 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Thermocouple is an example for
Answer
A. Active transducer
2
Residual voltage in LVDT is due to
Answer
D. All of the above
3
Gauge factor is highest for
Answer
A. Semiconductor strain gauge
4
Piezoelectric transducer is a
Answer
A. Active transducer
5
The change in Magnetic property of certain materials when they are mechanically
stressed is known as
Answer
D. Villari effect
6
Very large value of Hall effect emf is observed in
Answer
C. Semiconductors
7
Change in resistivity due to strain is known as
Answer
D. None of the above
8
A sensor which is able to detect the presence of nearby objects without any physical
contact is called
Answer
A. Proximity sensor
9
In a capacitive transducer the capacitance can be increased by
Answer
A. Reducing the distance of separation of parallel plates
10
In order to get high sensitivity a potentiometer should have
Answer
B. High value of wire length
11
The undesirable characteristic for a strain gauge is
Answer
B. Should have high hysteresis
12
Variable inductance transducer works on
Answer
D. All of the above
13
Which among the following is a synthetic piezoelectric material ?
Answer
B. Lithium sulphate
14
Hall effect transducer can be used for the measurement of
Answer
A. Current
15
Extremely low levels of luminous intensity can be detected using
Answer
C. Photomultiplier tubes
16
Which of the following is not a unit of pressure ?
Answer
C. Rankine
17
Which one of the following fluid is used in manometer ?
Answer
D. All the above
18
Thermal conductivity gauge used for pressure measurement is
Answer
B. Pirani gauge
19
Rapid changes of pressure can be measured using
Answer
B. Piezoelectric pressure gauge
20
Displacer type level detector works on
Answer
B. Archimedes principle
21
For non contact method of level measurement which one of the following is most
suited ?
Answer
D. Radiation level measurement
22
Which one of the following is not a direct level measuring method ?
Answer
D. Capacitive level measurement
23
40°C = ________
Answer
C. 104°F
24
Which one of the following is suitable for non contact temperature measurement ?
Answer
C. Radiation Pyrometer
25
The conductor commonly used for the construction of RTD
Answer
B. Platinum
26
In electromagnetic flow meters induced voltage is
Answer
A. Directly proportional to flow velocity
27
Cylinder and Piston type flow meter is a
Answer
A. Variable area flow meter
28
“Stokes” is the unit of
Answer
B. Kinematic Viscosity
29
Hot Wire Anemometer is used for
Answer
D. Flow measurement
30
Weirs are used for
Answer
B. Open channel flow measurement
31
Compared to open loop system closed loop systems are
Answer
C. A and B both
32
In force – current analogous system velocity is analogous to
Answer
B. Voltage
33
Product of all branch gains in a closed loop, in signal flow graph is known as
Answer
C. Loop gain
34
The highest power of “s” in the denominator of transfer function is known as
Answer
A. Order of the system
35
The system response during which the output changes from one value to another
value is called
Answer
B. Transient response
36
The ratio of actual damping to critical damping is called
Answer
B. Damping ratio
37
For a critically damped system, the damping ratio is
Answer
A. 1
38
If each term of the first column of the Routh array are positive the system is
Answer
C. Stable
39
Nichols chart can be used to determine
Answer
B. Closed loop frequency response
40
State variable approach is applicable to
Answer
D. All the above systems
41
If gain margin of a system is 0 dB, then the system is
Answer
B. Marginally stable
42
The root locus originates from
Answer
C. Open loop poles
43
Alcohol is pumped through a pipe of 10 cm diameter at 4 m/s flow velocity. Find the volume flow rate.
Answer
A. 0.0314 m³/s
44
The standard measuring range of a sensor is 4 – 20 mA. If we have a set point value
of 13 mA and a measurement of 12.5 mA, calculate the percent of span error.
Answer
A. 3.125
45
Controller with maximum stabilising time
Answer
B. PI
46
In a proportional controller offset can be decreased by
Answer
C. Larger proportional gain
47
Which of the following statements are true regarding flashing ?
Answer
B. Valve outlet pressure is less than or equal to the vapour pressure of the
process liquid
48
In air-to-close pneumatic valve, if the air supply above the diaphragm is lost, the
valve will
Answer
A. fail open
49
An equal percentage valve has maximum flow of 25 cm3/s and minimum of 1 cm3/s.
If full travel is 2 cm, find the flow at 1 cm opening
Answer
B. 5 cm3/s
50
Control system which has more than one controller is
Answer
B. cascade
51
Control algorithm with one controlled output and more than one manipulated variable
is
Answer
B. split range control
52
With increase in proportional gain speed of control system response will
Answer
C. increases
53
PLC can be programmed using
Answer
D. All of the above
54
Green colour indicates which wire type in LABVIEW ?
Answer
B. Boolean
55
Which of the following is not true regarding an ideal opamp ?
Answer
B. Infinite output impedance
56
In air-to-close pneumatic valve, if the air supply above the diaphragm is lost, the
valve will
Answer
A. —#+-—#4—
57
Symbol of gate valve is
Answer
B. ><]
58
A telemetry system using synchro transmitter and receiver is an example of
Answer
C. position telemetry system
59
Which of the following is not true about landline telemetry system ?
Answer
A. is free from transmission link distortions
60
In long distance telemetry data is transmitted in form of
Answer
D. frequency
61
End devices at telemetry receiver cannot be
Answer
Question Cancelled
62
Force balance system is a type of
Answer
B. current telemetry system
63
Beer-Lambert’s law holds good only for
Answer
D. monochromatic light
64
In a paramagnetic oxygen analyser highest point for which dry air is used to set the
span point.
Answer
A. 21 percent
65
The material that cannot be used for construction of filament in hot wire thermal
conductivity analyser is
Answer
B. Magnanin
66
Which of the following is a classification of liquid chromatography ?
Answer
D. All of the above
67
_________ is known as heart of a gas chromatograph, where the fundamental
process of separation takes place.
Answer
B. Column
68
Ions of different m/e ratio are separated by the difference in time they take to travel
over an identical path from the ion source to the collector. This is the working principle
of
Answer
B. Time-of-flight mass spectrometer
69
In which part of the flame photometer aerosol is produced and fed into the flame
Answer
B. Atomiser
70
Reference electrode that is used at high temperatures in pH measurement
Answer
A. Ag/AgCl electrode
71
If identical solutions are placed inside and outside the bulb of the glass electrode, it
is found that in spite of the apparent symmetry of the cell so formed, there exists an
emf of a few millivolt. This potential difference is called the
Answer
A. Asymmetry potential
72
Detector used in infrared spectrophotometer when a response time of 0.5 ms is
required
Answer
A. Photoconductive cell
73
In ECG waveform _________ wave represents repolarisation of both ventricles.
Answer
C. T wave
74
In EEG m/m number of electrode locations in the 10/20 system is
Answer
D. 21
75
__________ is not a part of emg machine.
Answer
C. Montage selector
76
Natural pacemaker of heart is
Answer
A. Sinoatrial node
77
The magnitude of the voltage picked up in an electromagnetic blood flow meter is
not directly proportional to the
Answer
D. polarity of magnetic field
78
The electrical shock that reaches to the heart directly and is highly concentrated is
called
Answer
A. Micro shock
79
Process of changing from resting potential to action potential is known as
Answer
B. Depolarisation
80
In CT scanners the impact of an X-ray photon with an electron is accompanied by a
transfer of energy and a fall in the X-ray frequency. This is known as
Answer
A. Compton effect
81
Which phenomenon causes polarization of light ?
Answer
C. Double refraction
82
In a Newton’s ring experiment, diameter of 10th dark ring due to a wavelength of
500 nm in water (�= 1.5) is 5 mm. The radius of curvature of lens is
Answer
B. 187 cm
83
Match the following :
i. Photodiode a. High sensitivity
ii. PIN diode b. Microwave switch
iii. Avalanche photodiode c. Low output response
iv. LED d. Fast output response
v. Phototransistor
Answer
Question Cancelled
84
Which of the following is true about Numerical Aperture (NA) ?
i. NA determines the light gathering ability of fibre
ii. It depends only on the refractive indices of core and cladding
iii. It’s value ranges from 0.5 to 1
iv. It is defined as sine of critical angle
Answer
C. Only i and ii are true
85
Match the following :
i. Ruby Laser a. T.H. Maiman
ii. Argon Laser b. 2 level laser
iii. He-Ne Laser c. ion laser
iv. Semiconductor laser d. 632.8 nm
Answer
C. i-a, ii-c, iii-d, iv-b
86
Which of the following is true ?
i. Oscilloscope is basically a voltmeter
ii. CRO is a fast x-y plotter
iii. Effect of negative voltage to the grid is an attractive force
iv. Focusing and accelerating anodes are cylindrical
v. During flyback period, voltage is very high
Answer
B. Only i, ii and iv are true
87
The inductance of a moving iron instrument is given by L = (40 + 2θ − θ²) μH, where θ is the deflection in radians from zero position. The spring constant is 12 × 10⁻⁶ Nm/rad. Estimate the deflection for a current of 2 A.
Answer
B. 0.25 rad
88
A simple equal arm voltage sensitive bridge is initially balanced. Three of the arms
consists of ordinary resistors, while the fourth is a thermistor. Each arm has a
nominal resistance of 1K� and the bridge is energised with a 10V dc source. If a
temperature change causes a + 15% change in thermistor resistance, what output
voltage
Answer
A. pproximately) will be indicated from the bridge ?
89
Which of the following is true ?
i. An ammeter is used for measuring magnitude and direction of current flow
ii. D’ Arsonval galvanometer is used to measure small voltage and current in the
circuit
iii. Galvanometer connected with high resistance in series is used as ammeter
iv. A galvanometer also is known as PMMC instrument
Answer
D. Only ii and iv are true
90
The two-wattmeter method is used to measure power in a balanced 3-phase circuit, drawing lagging current. The power factor if one of the wattmeters reads twice the value of the other wattmeter:
Answer
D. √3/2
91
A
Answer
A. 2%
92
An ammeter has a current range of 0 – 10A, and its internal resistance is 0.5 �. In
order to change the range to 0 – 50A, we need to add a resistance of
Answer
A. 0.125 � in parallel with the meter
93
A stationary closed Lissajous pattern on an oscilloscope has 5 horizontal tangencies
and 3 vertical tangencies for a vertical input with frequency 8 kHz. The frequency of
horizontal input is
Answer
A. 4.8 kHz
94
An amplifier has an open loop voltage gain of – 300. This gain is reduced to – 100 when
negative feedback is applied. The reverse transmission factor ��of this system is
Answer
B. – 0.0066
95
Match the following :
i. SCR a. bidirectional switch
ii. Transistor b. switch
iii. TRIAC c. bidirectional uncontrolled device
iv. DIAC d. switch and amplifier
Answer
B. i-b, ii-d, iii-a, iv-c
96
Simplify the expression: Y = A̅B + (A + B)C̅
Answer
A. A̅B + C̅
97
Two passive RC integrator circuits are connected in series. If the input to the first
RC integrator circuit is a pulse waveform, what will be the output of secondary RC
integrator circuit ?
Answer
C. Sine wave
98
The number of special function registers in 8051 is
Answer
B. 21
99
Consider the following program. Let’s assume that internal memory 80 H contains
05 H.
ORG00H
MOV R3, #80H
MOV A, @R3
MOV B, A
ADD A, B
END
Choose the right answer.
Answer
C. Syntax error
100
Example of a register addressing mode is
i. MOV A, B
ii. MOV R1, R0
iii. MOV A, @R1
iv. MOV B, R3
Answer
C. Only i and iv
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