The closeness with which the reading of an instrument approaches the true value of the variable being measured is called : a accuracy b precision c sensitivity d resolution e discrimination. Ans: a. Errors due to assignable causes are called : a static errors b systematic errors c calibration errors d random errors e known errors.
Pick up the appropriate word for A pointer moving over a scale : a instrument b indicator c transducer d gauge e recorder. Pick up the appropriate word for A reading obtained from the motion of a pointer on a scale : a analog b digital c display d indicator e instrument. Pick up the appropriate word for The reading displayed as a number, a series of holes on a punched card, or a sequence of pulses on magnetic tape : a pulse train b digital c analog d numeral e recording. For studying detailed variations with time, one uses : a indicator b digital indicator c recorder d integrator e analog indicator.
Ans: c. The condition of how much successive readings differ from one another for a fixed value of the variable is called : a accuracy b error c sensitivity d resolution e precision. Ans: e. The smallest change in measured value to which the instrument will respond is called a accuracy b precision c amplification d resolution e sensitivity. It responds directly to the measured quantity, producing a related motion or signal : a sensing element b transducer c transmitter d indicator e measuring device.
Which of the following is used to count the number of brass items passing on a conveyor line, when no contact is permitted with the object: a event counter b mechanical counter c magnetic pick up d photoelectric cell e electronic counter. Which of the following does not pertain to timing device : a charging of a condenser b flow of oil through a dash pot c release of air through a nozzle d flow of sand through an opening e piezoelectric crystal.
Motion of fast-moving systems may be timed and studied by means of a : a stroboscope b piezoelectric crystal c electronic timer d chronometer e photovoltaic cell. In which device the input motion changes the inductive coupling between primary and secondary coils : a potentiometer b synchro c collimator d protractor e dial gauge. Which effect is useful in measuring rapidly varying forces : a piezoelectric b strain gauge c photovoltaic d pneumatic gauging e change of capacitance.
Pressure measuring devices are not based on: a measure of an equivalent height of liquid column b measure of the force exerted on a fixed area c measure of some change in electrical or physical characteristics of the fluid d area measurement by polar planimeter e all of the above. Which of the following may be measured by the deflection of an elastic element, by balancing against a known force, by the acceleration produced in an object of known mass : a force b pressure c temperature d level e displacement.
The sensitivity of reading of manometer can be increased by : a inclining the manometer rube b using low specific gravity fluid c application of optical magnification d use of level sensing device e all of the above. Which of the following device is used as a standard for calibrating pressure gauges : a manometer b diaphragm c bellows d dead weight pressure tester e piezoelectric crystal. Which gauge can be used to measure pressure below 1 xm : a dead weight tester b pirani gauge c ionization gauge d McLeod gauge e absolute pressure sensor.
Which is not correct statement about selection of tube material for a Bourdon gauge: a Have high creep strength to withstand high temperature b Be stable enough to maintain its calibration indefinitely c Be immune to corrosion from the fluid inside the tube, and from the atmosphere outside it d Be hard enough to withstand the applied pressure without any part of it being stressed above the limit of proportionality e Be easy to fabricate.
Hysteresis error in Bourdon tube can be minimized by : a using proper tube material b using proper diameter and thickness of tube c avoiding temperature cycling d using it well within the designed pressure range e using separating diaphragm and avoid direct ingress of hot. Pick up false statement about pressure measurements : a low pressure is normally measured by manometers b medium pressure by diaphragms or bellows c medium and high pressure by Bourdon gauge d all pressures by transducers e absolute pressure by piezoelectric crystal.
A siphon or loop in the connecting pipe is interposed as close as possible to the pressure gauge so that: a steam can condense to form a seal of water to fill the tube or bellows at the pressure being measured b air or vapour collection is avoided c moisture formed in pipe can be drained d static head errors are eliminated e it acts as dampener and does not pass on pressure variations to sensor. Ring balance gauge is used for measurement of: a absolute pressure b vacuum c differential pressure d temperature e gauge pressure.
The deflection of center of capsule formed by circumferential welding of two diaphragms is proportional to : a active diameter of diaphragm D b D c D2 d D3 e D4 Ans: e. The development of following element has improved the reliability and the response action of low pressure gauges : a diaphragm b capsule c bourdon d ring balance e all of the above.
Proving rings are used to measure : a displacement b force c velocity d acceleration e shock. Which type of device is suitable for dynamic force measurement: a lever balance b spring balance c proving ring d piezo-electric transducer e all of the above. Hysteresis errors in Bourdon tubes can be minimized by : a selecting proper material b proper design and fabrication c using them well within the designed pressure range d avoiding direct entry of steam into it e calibrating it from time to time.
In case of strain gauge transducers, several strain cycles, and temperature cycles are carried out before making measurements, in order to : a increase life b enable high repeatable readings c eliminate premature failures d increase accuracy e avoid drift. Which gauge is based on the change of heat conductivity of a gas with pressure and the change of electrical resistance of a wire with temperature : a thermocouple gauge b Bourdon gauge c Ionization gauge d nuitating disk gauge e Pirani gauge.
Which of the following have relatively large and negative temperature coefficients of resistance : a radiation pyrometers b optical pyrometers c thermistors d platinum resistance detectors e thermocouples. Thermal expansion of a solid is employed in : a thermocouple b resistance thermometer c bulb thermometer d bimetal element e zener diode.
Cold junction compensation is needed in ase of measurement of temperature by : a thermocouple b thermopile c thermistor d zener diode e resistance thermometer. Which of the following consists of a very thin strip of nickel or platinum foil which responds to temperature in the same manner as the resistance thermometer : a thermo pile b bolometer c radiation pyrometer d thermistor e optical pyrometer.
Twisting the thermocouple wires together and heat welding them : a is the standard practice of making junction b would result in noise generation c cause small errors due to local e. An instrument that is capable of measuring only dc is: a Moving coil b Moving iron c Thermo couple d None of the above. A ballistic galvanometer is used to measure: a Charge b Current c Voltage d Frequency.
For measuring emf of a standard cell we use: a Galvanometer b Potentiometer c Zener reference d Electro-dynamic voltmeter. Megger is an instrument used for the measurement of: a High resistance and insulation resistance b Medium resistance c Low resistance d Leakage current.
Vibration reeds are employed in: a Frequency meter b Power factor meter c Synchroscope d Megger. Kelvin double bridge is best suited for the measurement of: a Inductance b Capacitance c Low resistance d High resistance.
Introduction of dielectric: a Increases the capacitance b Reduces the breakdown voltage c Reduces the mechanical voltage d Increases the size of the capacitor. The material used to make standard resistance is: a Manganin b Aluminium c Nichrome d Platinum.
The instrument having its deflection depends upon average value is: a Moving iron b Hot wire c Rectifier type d Induction type. While testing cables the galvanometer used should be initially short-circuited in order to protect it from sudden initial inrush currents as the cable have: a A low value of initial resistance b A low value of initial capacitance c A high value of initial capacitance d Both a and b.
Thank You. Thank you. Your email address will not be published. Hysteresis of an instrument means: a The change in the same reading when input is first increased and then decreased b The reliability of the instrument c The repeatability of the insrument d The inaccuracy due to change in temperature ANSWER : A 2. In which part of the scale does the pointer indicate more accurately a In the first third of the cycle b In the first half of the cycle c In about middle of the scale d In the last third of the cycle ANSWER : C 3.
For measuring an unknown electrical quantity, select the meter with a Highest range and work down b Lowest range and work up c Middle range and can be work up or down depending d Any of the above ANSWER : A 4.
Such materials are called a Piezo-electric b Photo-electric c Thermo-electric d Photo-resistive Ans : a. Which of the following are piezo electric substances? Barium titanate 2.
Lead titanate 3. Lead Zirconate 4. Cadmium and sulphate a 1,2 and 4 b 1,3and4 c 1,2and 3 d 2,3and 4 Ans : c. Piezo-electric transducers are a Passive transducers b Inverse transducers c Digital transducers d Pulse transducers Ans : b. Piezo electric crystal can produce an emf a When external mechanical force is applied to i b When radiant energy stimulates the crystal c When external magnetic field is applied d When the junction of two such crystals are heated Ans : a.
The size of air cored transducers in comparison to the iron core parts is a Smaller b Larger c Same d Unpredictable Ans : b. Which of the following can be measured with the help of piezo electric crystal? S1: Transducer is a device which converts physical into electrical quantity S2: Transducer is also called as sensor. In a LVDT, the two secondary voltages a Are independent of the core position b Vary unequally depending on the core position c Vary equally depending on the core position d Are always in phase quadrature Ans : b.
Match the following 1. EEG A. Diagnostic tool for heart alignment 2. ECG B. Diagnostic tool for brain alignment 3. Sphygmo-manometer C. Instrument used for measuring blood pressure 4. Stethoscope D. The transducers which requires an external power and their output is a measure of some variation such as resistance, inductance, capacitance etc. The principle of operation of variable resistance transducer is a Deformation leads to change in resistance b Displacement of a contact slider on a resistance c Coupling of two coils changes with displacement d Movement of magnetic field produces variation in resistance of material Ans : b.
Venturi is associated with a Venous blood pressure b Digital plethysmography c Dialysate flow in artificial kidney d Blood flow in heart lung machine Ans : d. Pressure transducer for measuring blood pressure is a Strain gauge transducer only b Strain gauge or capacitive transducer c Resistive transducer d Fiber optic transducer Ans : b. In foil strain gauge the thickness of foil varies from a 2. Photo conductive cell consists of a thin film of a Quartz b Lithium sulphate c Barium titanate d Selenium Ans : d.
S1: In multimode fiber optics, intensity modulating schemes can be employed. S2: Schemes using polarizing techniques need birefringent fiber. Test electrode is also known as a Indicator electrode b Reference electrode c Second electrode d Primary electrode Ans : a. Most commonly used indicator electrode is a Calomel electrode b Silver electrode c Silver — Silver chloride electrode d Glass electrode Ans : d.
Silver chloride electrode is used as a reference electrode due to its a Large half cell potential b Stable half cell potential c Stable resting potential d Stable action potential Ans : b. The capacitance microphone is used for the detection of a Heart rate b Blood flow c Heart sound d Foot pressure Ans : c. The decibel is a measure of a Current b Voltage c Power d Power level.
Power gain in decibels is equal to voltage gain in decibels only when a Input impedance is equal to output impedance b Output impedance is zero c Never d Input impedance is zero. An ideal amplifier has a Noise figure of 0 db b Noise figure of more than 0 db c Noise factor of unity d Noise figure of less than 1 db Ans : c.
In an amplifier, the coupling capacitors are employed for a Limiting the bandwidth b Matching the impedance c Preventing of Dc mixing with input or output d Controlling the output. The amplifier which has no drift is called as a Differential amplifier b DC amplifier c Single ended amplifier d Chopper amplifier.
The amplifier gain varies with frequency. This happens mainly due to a Miller effect b Presence of external and internal capacitance c Logarithmic increase in its output d Inter stage transformer.
The outstanding characteristics of a D. Isolation amplifier actually operates on the principle of a Filtering b Attenuation c Clipping d Amplification Ans : b.
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