| Post Name | Mechanic |
|---|---|
| Department | Medical Education |
| Question Paper Code | 121/2026/OL |
| Category Code | 470/2025 |
| Date of Test | 11 June 2026 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
What will happen if a multimeter set to current mode is connected directly across a voltage source?
Answer
C. A short circuit may occur
2
A metric outside micrometer has a spindle pitch of 0.5 mm and a thimble divided into 50 equal graduations. During a calibration check against a standard block, the thimble reads 2 divisions below zero when the anvils are fully closed. What is the instrument's systematic error, and how should a subsequent reading be corrected ?
Answer
C. Negative zero error of 0.02 mm; add 0.02 mm to the observed reading
3
An electrical engineer needs to secure a heavy terminal block to a copper busbar using an M6 x 1.0 metric coarse bolt. Utilizing the standard engineering approximation formula for a standard 75% thread engagement, what diameter tap drill bit should be selected ?
Answer
B. 5.0 mm
4
Why should burrs be removed after cutting a conduit pipe ?
Answer
A. To reduce wire insulation damage
5
The conductivity of a semiconductor generally
Answer
C. Increases with increase in temperature
6
In an AC circuit, the RMS value of current represents
Answer
C. Equivalent DC heating value
7
Which tool is commonly used for cutting external threads on conduit pipes ?
Answer
D. Die stock with dies
8
When making a splice joint between two electrical copper wires, what is the primary chemical function of applying soldering ļ¬ux ?
Answer
C. To dissolve and remove surface oxide layers from the metal surfaces when heated, allowing the molten solder to wet and bond properly.
9
During the discharge of a basic primary LeclanchƩ cell, hydrogen gas bubbles accumulate and form a thin layer around the carbon cathode. What is this phenomenon called ?
Answer
C. Polarization
10
A magnetic ļ¬ux of 400 ĀµWb passes perpendicularly through a steel core with a cross sectional area of 2 cm Ć 1 cm. Calculate the magnetic ļ¬ux density (B) inside the core.
Answer
B. 2.0 T
11
The peak value of an AC current is 14.14 A. Its RMS value is
Answer
C. 10 A
12
An electrical technician uses an oscilloscope to measure an AC voltage waveform and notes that a single complete cycle occupies exactly 20 milliseconds on the timebase grid. What is the cyclic frequency (f) of this electrical power source ?
Answer
B. 50 Hz
13
An air-core toroidal inductor has N turns, mean radius R and cross-sectional area A. If the number of turns is doubled while all other physical dimensions remain unchanged, how does the self-inductance of the toroid change ?
Answer
C. It becomes four times the original value
14
Two capacitors, 10 ĀµF and 20 ĀµF, are each rated for a maximum voltage of 100 V. They are connected in series across a DC voltage source whose voltage is gradually increased. Which capacitor will reach its voltage rating ļ¬rst ?
Answer
A. The 10 ĀµF capacitor
15
How does inserting a solid material with a high dielectric constant (such as mica) between the plates of an isolated, charged capacitor aļ¬ect its capacitance and terminal voltage ?
Answer
C. Capacitance increases and voltage decreases
16
In a series RLC circuit, what happens to the total impedance (Z) when the circuit operates exactly at its resonant frequency ?
Answer
B. It becomes minimum and equal to the resistance R
17
The total opposition oļ¬ered by an AC circuit to the ļ¬ow of current is called
Answer
D. Impedance
18
The commutator in a DC motor acts as
Answer
A. Mechanical rectiļ¬er
19
What is the primary cause of cogging torque (magnetic locking) in an electric motor, especially during starting or low-speed operation ?
Answer
B. Magnetic attraction between the stator teeth (slots) and rotor magnetic poles
20
A stepper motor converts
Answer
B. Electrical pulses into discrete angular movement
21
What is the relationship between primary voltage (Eā, Vā) and secondary voltage (Eā, Vā) in an ideal transformer?
Answer
A. Eā = Vā and Eā = Vā
22
Why the core of current transformer is having low reactance and low core losses ?
Answer
D. To minimise the error in reading
23
What is the name of transformer ?
Answer
A. Air core transformer
24
What is the name of the scale ?
Answer
D. Non-linear scale
25
Which is an absolute instrument ?
Answer
D. Tangent galvanometer
26
Calculate the value of shunt resistance required to measure 10 mA with one mA and meter resistance 30 ā¦.
Answer
A. 3 ā¦
27
Which instrument is used to measure one ohm and below one ohm resistance value accurately ?
Answer
C. Shunt type ohm meter
28
What is the name of the instrument ?
Answer
A. Attraction type moving iron
29
How can a dynamo meter type instrument be modiļ¬ed to function as a milliammeter or microammeter ?
Answer
B. By connecting the ļ¬xed coil and moving coil in series
30
What is creeping in an energy meter ?
Answer
B. Continuous slow rotation of the disc even when there is no load
31
A domestic AC supply say 230 V is applied to a halfwave rectiļ¬er circuit through a transformer of turn ratio 10 : 1. Find the maximum Primary and Secondary voltage.
Answer
B. 325.3 Vpm and 32.53 Vsm
32
Which of the following statement is true ?
Answer
C. Majority carriers in āPā type semiconductor are holes
33
The breakdown voltage of a Zener diode is 5 V. What is the resistance required to allow a current (I) of 100 mA through the Zener diode in reverse bias connected to a battery of emf 12 V ?
Answer
B. 70 ā¦
34
Which types of diode rectiļ¬er output double the input AC frequency of the pulsating DC ?
Answer
C. Two diode fullwave rectiļ¬er
35
The output voltage range of regulator IC 723 is
Answer
C. Between 2 V ā 37 V
36
Gain of current gain in common collector ampliļ¬er is
Answer
B. High
37
Which circuit is determined by the frequency variation of LC tank circuit ?
Answer
B. Positive feedback ampliļ¬er
38
2N2646 is a code number of which component ?
Answer
D. UJT
39
Rate change of output voltage refers in operational ampliļ¬er is
Answer
D. Slew Rate
40
What is the circuit function of 555 IC, while using in an Astable Multivibrator ?
Answer
B. Switches between two stable states without an external trigger continuously
41
The base of Octal number system is
Answer
B. 8
42
In Boolean Algebra, A + A equal to
Answer
C. A
43
Which gate gives inverted output ?
Answer
D. NOT
44
Register is madeup of using
Answer
B. Flip-Flops
45
Gray code is mainly used to
Answer
D. Reduce errors
46
A Flip-Flop is a
Answer
A. Memory element
47
Sampling theorem is related to
Answer
B. ADC
48
Which gate is commonly used for diļ¬erence output in subtractor ?
Answer
C. XOR
49
The deļ¬ection sensitivity of a CRO is expressed in
Answer
C. cm/Volt
50
Which interrupt has the highest priority in 8085 microprocessor ?
Answer
C. TRAP
51
The output of a measurement system should ideally have
Answer
B. High ļ¬dility
52
The dynamic characteristics become important when
Answer
D. Input varies with time
53
An instrument may be precise but not accurate due to
Answer
B. Systematic errors
54
The unit of strain is
Answer
D. No unit
55
Which is the operating principle of Eddy current tachometers ?
Answer
B. Electromagnetic induction
56
Semiconductor strain gauges have
Answer
C. Higher gauge factor
57
The standard atmospheric pressure corresponds to
Answer
A. 760 mm Hg
58
Piezoelectric pressure transducers are most suitable for
Answer
B. Dynamic pressure measurement
59
Pirani gauge works on the variation of
Answer
D. Thermal conductivity of gas
60
Gauge pressure is measured relative to
Answer
B. Atmospheric pressure
61
Which of the following describes the relationship between ļ¬uid velocity and pressure in a restriction according to Bernoulli's principle ?
Answer
C. Velocity and pressure are inversely related; as velocity increases, pressure decreases
62
What is the SI unit of discharge ?
Answer
B. Cubic metre per second
63
Reynold's number (Re) is deļ¬ned fundamentally as the ratio of which two forces ?
Answer
B. Inertia force to Viscous force
64
Which type of oriļ¬ce plate is speciļ¬cally noted for being bored 'tangential to a circle' to prevent the damming up of solid materials or foreign particles at the bottom of a pipe line ?
Answer
D. Eccentric oriļ¬ce plate
65
Which material is/are used for making ļ¬ow nozzle ?
Answer
C. Both 1 and 2
66
The operating principle of a Pitot Tube is based primarily on measuring the diļ¬erence between which two pressure points ?
Answer
C. Impact (stagnation) pressure and static pressure
67
How does a rotameter (variable-area ļ¬ow meter) maintain a constant diļ¬erential pressure across its ļ¬oat while measuring diļ¬erent ļ¬ow rates ?
Answer
D. By utilizing a tapered tube that increases the annular area for ļ¬uid ļ¬ow as the ļ¬oat rises
68
Which device is classiļ¬ed as an indirect level measurement instrument ?
Answer
C. Hydrostatic pressure transmitter
69
In a Magnetic ļ¬oat-type level gauge, where is the permanent magnet located ?
Answer
B. Sealed inside the internal ļ¬oating element
70
What is primary safety function of the ball-check mechanism inside a level gauge valve assembly ?
Answer
B. To instantly shut oļ¬ ļ¬uid ļ¬ow if the glass tube shatters or breaks
71
What is the basic standard SI unit of quantity of heat energy ?
Answer
A. Joule
72
Which primary category of thermometers relies strictly on the expansion of solids for its mechanical operating principle ?
Answer
C. Bimetallic thermometers
73
Which component inside a temperature transmitter is speciļ¬cally responsible for eliminating electrical noise from the raw point sensor signal ?
Answer
C. The input ampliļ¬cation circuit ļ¬lter
74
Which two temperature scales are explicitly classiļ¬ed as 'absolute scale' system because they utilize absolute zero as their reference point ?
Answer
C. Rankine and Kelvin
75
The operation of gas thermometers depends primarily upon which fundamental physical law ?
Answer
D. Ideal gas law
76
Which metal is most commonly used for precision resistance measurement in RTD sensors due to its stability, corrosion resistance and purity ?
Answer
A. Platinum
77
Which thermocouple type is composed of Chromel and Constantan alloys and covers a typical measurement span from 0 to 870 degree centigrade ?
Answer
D. E-Type
78
What is the temperature range of optical pyrometer typically provide an accurate method of measurement ?
Answer
C. Between 600 and 3000 degree celsius
79
Which physical law governs the basic operation principle of a hydraulic actuator system ?
Answer
D. Pascal's law
80
What behavious deļ¬nes a 'reverse acting' (air-to-open) pneumatic diaphragm actuator ?
Answer
D. An increase in pneumatic control pressure lifts the valve stem against a spring to open the valve
81
In which controller the output of primary controller is the setpoint to the secondary controller ?
Answer
B. Cascade controller
82
The Ziegler-Nichols method is a popular technique used for
Answer
A. PID controller tuning
83
Which ladder diagram represents the equation Y = A.B ?
Answer
A. Ladder diagram: normally-open Input A and Input B contacts in series with Output coil
84
What is the purpose of scan cycle in PLC operation ?
Answer
C. Sequentially processing inputs logics and outputs
85
Full form of HART is
Answer
B. Highway Addressable Remote Transducer
86
Which of the following is a input device of a PLC ?
Answer
C. Proximity sensor
87
In a proportional controller the proportional gain factor (Kp) increases, the system
Answer
A. Overshoot and undershoot increases
88
What is an 'error signal' in feedback loop ?
Answer
B. The diļ¬erence between the setpoint and measured value
89
In a feedforward control system which of the following is true ? I. System in which corrective is taken before disturbances aļ¬ect the output. II. Variables are adjusted based on prior knowledge and predictions.
Answer
C. Both I and II
90
HART Communication uses which type of signals for communication ?
Answer
B. Analog and digital
91
Which topology requires a multipoint connection ?
Answer
B. Bus
92
Two devices are in network if
Answer
A. A process in one device is able to exchange information with a process in another device
93
RJ-45 is commonly used to connect
Answer
C. Both UTP and STP cable
94
For a good message transmission the signal to noise ratio should be
Answer
A. High
95
What does the acronym SCADA stand for ?
Answer
B. Supervisory Control and Data Acquisition
96
In a Distributed control System which of the following is true ? I. DCS has a layered structure. II. DCS has a two master controllers.
Answer
A. Only I is true
97
Dissolved oxygen concentration indicates
Answer
A. Quality of water
98
RTP stands for
Answer
A. Remote Transmission Panel
99
Which ļ¬eld bus communication uses master-slave principle ?
Answer
B. MODBUS
100
How is pH deļ¬ned ?
Answer
A. Negative logarithm of hydrogen ion concentration
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