Measurement and Instrumentation Questions and Answers
Measurement and Instrumentation Questions and Answers
1. For measurement of low resistances, Kelvin's double bridge has high accuracy because:
a. It has two sets of ratio arms which eliminate the effects resistance of connecting lead
b. It has a galvanometer indicating zero
c. It has two null pointers
d. It has four sets of ratio arms that eliminate effect of resistance of connecting lead
Answer: It has two sets of ratio arms which eliminate the effects resistance of connecting lead
2. Swamp resistance is a built-up resistance_____________
a. An alloy of Manganese and Copper
b. An alloy of aluminum and copper
c. Alloys of nickel and cobalt
d. Alloys of Manganese and Aluminum
Answer: An alloy of Manganese and Copper
3. A meter of swamping resistance in a moving coil added in ______
a. Minimize frequency error
b. Reduce temperature error
c. Reduce electricity consumption
d. All of these
Answer: Reduce temperature error
4. Frequency error in induction devices can be compensated by use of ________
a. Non-inductive shunt in both ammeters and voltmeters
b. In case of ammeters non-inductive shunt and are generally self-compensating in case of voltmeter
c. Both ammeters are self-compensating in case and voltmeter
d. Self-compensation in case of ammeters and non-ammeters inductive shunt in case of voltmeter
Answer: In case of ammeters non-inductive shunt and are generally self-compensating in case of voltmeter
5. To reduce the error in induction Instrument for measuring alternating current is _____________
a. The frequency with which the instrument occurs calibrated
b. Higher frequency than the instrument was calibrated
c. Low frequency compared to the instrument was calibrated
d. None of these
Answer: The frequency with which the instrument occurs calibrated
6. In an induction voltmeter, there are split phase windings obtained by adding a ______
a. High resistance in series with windings of both magnet
b. High resistance in series with a turn of one magnet and an inductive coil in series with windings of other magnets
c. An inductive coil in series with one turn magnets and Capacitance in Series with Windings
of other magnets
d. Inductive coils in series with turns of both magnet
Answer: High resistance in series with a turn of one magnet and an inductive coil in series with windings of other magnets
7. A cylindrical type with split phase winding induction ammeters use ________
a. A rotating disk
b. A hollow aluminum drum
c. A single current producing a winding
d. Either (1) or (2)
Answer: A hollow aluminum drum
8. Induction type devices are commonly used like ______
a. Ammeter
b. Voltmeter
c. Wattmeter
d. All of these
Answer: All of these
9. Damping torque is the torque that acts on _____________
a. Fixed system of instruments
b. Moving system of the instrument only when steady
c. Moving system of the instrument only when by moving
d. Fixed system of instrument only then
A moving mechanism is moving
Answer: Moving system of the instrument only when by moving
10. There should be gravity controlled devices kept _____________
a. Vertical
b. Horizontal
Inclined at c.45 degrees
Inclined at d.75 degrees
Answer: Vertical
11. Measurement systems have random errors due to _______________
a. Changes in environment
b. Use of calibrated instruments
c. Poor cabling practices
d. Unintended Effects
Answer: Unintended Effects
12. Calibration of the instrument is important considerations in measurement systems. Mistakes were made instruments that are out of calibration can be corrected by ________
a. Increasing the frequency of recalibration
b. Increasing the temperature coefficient
c. Increasing the sensitivity of the measuring device
d. Reducing the frequency of recalibration
Answer: Increasing the frequency of recalibration
13. Undesirable characteristics of measurement the system is _____________
a. To carry
b. Dead zone
c. Nonlinearity
d. All of these
Answer: All of these
13. If the instrument is used incorrectly apply, then it will effect _____
a. Systematic error
b. Instrument error
c. Random error
d. Environment error
Answer: Instrument error
14. A suitable method for systematic reduction errors are/are _____________
a. The tool should be carefully designed
b. By introducing an equal and opposite environment inputs to offset environmental impact input to the measurement system
c. By adding high gain feedback to the measurement system
d. All of these
Answer: All of these
15. There may be systematic errors of the instrument reduced by making ______
a. Sensitivity of the instrument to environmental inputs as little as possible
b. As the sensitivity of the instrument to environmental inputs as high as possible
c. Does not depend on sensitivity to systematic errors tool
d. None of these
Answer: Sensitivity of the instrument to environmental inputs as little as possible
16. Dimension of the environment - motivated is different from the specified calibration condition uantified by ______
a. Sensitivity flow
b. Zero flow
c. Backlash
d. Both (1) and (2)
Answer: Both (1) and (2)
17. In a moving coil voltmeter, the input resistance can be increased by meter ______
a. Increasing the number of turns in the coil
b. Reducing the number of turns in the coil
c. Using the same number of coil turns made up of high resistant materials
d. Both (1) and (3)
Answer: Both (1) and (3)
18. depending on whether the display is numeric or not or an alphanumeric, segmental display is ______
a. 7 Divisional
b. 14 segmental
c. 21 segmental
d. Either (1) or (2)
Answer: Either (1) or (2)
19. A measurement that can be simplified using the x – y recorder is / are _______________
a. Speed – torque characteristics of motors
b. Regulation curve of power supply
c. Hysteresis curve
d. All of these
Answer: All of these
20. A potentiometer is used for measurement of ________
a. Linear displacement
b. Angular displacement
c. Non-linear displacement
d. Only (1) and (2)
Answer: Only (1) and (2)
21. The instrument for measuring displacement is are ______
a. Potentiometer
b. Lvdt
c. Rvdt
d. All of these
Answer: All of these
22. In fiber - optic level sensors, amount of light damage depends on ________
a. Amount of cable submerged in liquid
b. Amount of light reflected back
c. Amount of cable not in liquid
d. The amount of light that is not reflected back
Answer: Amount of cable submerged in liquid
23. A tool capable of discrimination atemperature difference of even 0.1 degrees Celsius is ______
a. Fiber – Optic Level Sensors
b. Laser method
c. Thermography
d. Vibration level sensors
Answer: Thermography
24. Contact instruments used for measurement of the levels are ______
a. Increases
b. Decreases
c. Remains the same
d. None of these
Answer: Decreases
25. To measure pressure the equipment used may be ______
a. Mechanical
b. Electro - Mechanical
c. Electronic
d. All of these
Answer: All of these
26. If at one end, the two wires become different if the metals are connected together, a voltage will be produced the difference of is generated between the two strings temperature between the two ends of the wire. This is the effect observed in __________
a. Thermocouples
b. Thermistors
c. Rtd
d. Ultrasonic
Answer: Thermocouples
27. Schering bridges are used for measurement of ______
a. Unknown Capacitance
b. Dielectric loss
c. Power factor
d. All of these
5. None of these
Answer: All of these
28. AC bridge is used frequency measurement is _____
a. Shering Bridge
b. Wien Pool
c. Grass bridge
d. Anderson Pool
Answer: Wien Pool
29. If the two wattmeter readings are the same nd vice versa when measuring power in 3 phases induction motor will then be the power factor of the load to be ________
a. Unity
b. Zero
c. 0.5 lagging
d. 0.5 leading
Answer: Zero
30. Transformer ratio of the transformer it depends on______
a. Exciting flow
b. Secondary flow
c. Power factor of secondary circuit
d. All of these
Answer: All of these
31. A dynamometer wattmeter can be used _____________
a. D.C. only
b. A.C. only
c. Both D.C. and A.C.
d. None of the above
Answer: Both D.C. and A.C.
32. An induction wattmeter can be used for this_____________
a. D.C. only
b. A.C. only
c. Both D.C. and A.C.
d. None of the above
Answer: D.C. only
33. In 3-phase power measurement by two wattmeter method, reading on a the wattmeter is zero. The power factor of the load must be to be ______________
a. Unity
b. 0.5
c. 0.3
d. Zero
Answer: 0.5
34. Adjustment of the position of the shading band, in an energy meter is made to provide _____
a. Friction compensation
b. Creep compensation
c. Braking torque
d. None of the above
Answer: Friction compensation
35. Ohmmeter is a ___________ instrument.
a. Moving iron
b. Moving coil
c. Dynamometer
d. None of the above
Answer: Moving coil
36. To measure very high resistance, you should use________
a. Kelvin's double bridge
b. Wheat stone bridge
c. Magar
d. None of the above
Answer: Magar
37. Electrical power is provided by t a measure______
a. Battery
b. Permanent magnet DC Generator
c. AC Generator
d. Any of the above
Answer: Permanent magnet DC Generator
38. The controlling torque is provided by the megger ______
a. Spring
b. Gravity
c. Coil
d.AD current
Answer: Coil
39. The operating voltage of megger is approx ______V.
a. 6 Vs
b. 12 Vs
c. 40 Vs
d. 100 Vs
Answer: 100 Vs
40. Murray's loop test can be used for the location of _____________.
a. Ground fault on the cable
b. Short circuit fault on cable
c. Both ground fault and short circuit fault
d. None of the above
Answer: Both ground fault and short circuit fault
41. ___________________ should be used for accuracy the measuring voltage of low DC
a. Short range moving coil voltmeter
b. D.C. Potentiometer
c. Short range thermocouple voltmeter
d. None of the above
Answer: D.C. Potentiometer
42. Best instrument for true open circuit measurement the e.m.f of the battery is _____________.
a. D.C. voltmeter
b. Ammeter and known resistance
c. D.C. Potentiometer
d. None of the above
Answer: D.C. Potentiometer
43. A phase shifting transformer is used in conjunction with ______
a. D.C. Potentiometer
b. Drysdale potentiometer
c. Answer: c. Coordinate potentiometer
d. Crompton potentiometer
Answer: Drysdale potentiometer
44. To achieve high accuracy, slide wire potentiometer should be _____________
a. As far as possible
b. As short as possible
c. Not too small or too big
d. Too thick
Answer: As far as possible
45. Stator of phase shifting transformer for use potentiometers usually have A in conjunction with AC _____________.
a. Single-phase winding
b. Two-step turn
c. Three-step turn
d. None of the above
Answer: Two-step turn
46. Co-ordinate potentiometer, current in AC there are in-phase and quadrature potentiometers adjusted to be __________
a. Out of phase by 90°
b. out of phase by 180°
c. Out of phase by 60°
d. Out of phase by 0°
Answer: Out of phase by 90°
47. A universal RLC bridge uses ___________________
a. Maxwell bridge configuration for measurement of inductance and de Santy's bridge for measurement of capacity
b. Maxwell vane bridge configuration for measurement to measure inductance and de Santy's bridge capacity
c. Maxwell vane bridge configuration for measurement inductance and vane bridge for measurement of capacity
d. None of the above
Answer: Maxwell vane bridge configuration for measurement to measure inductance and de Santy's bridge capacity
48. For measurements on high voltage capacitors, the correct bridge is _____________.
a.Wayne Poole
b. Santi's bridge modified
c. Schering Bridge
d. None of the above
Answer: Schering Bridge
49. Wagner earthing machine is used to eliminate error due to ________
a. Electrostatic Coupling
b. Electromagnetic coupling
c. Both 1 and 2
d. None of the above
Answer: Electrostatic Coupling
50. The mutual inductance can be calculated using _____________
a. Anderson Pool
b. Maxwell's bridge
c. Heavy side pool
d. Any of the above
Answer: Heavy side pool
51. The entire range of audibility in audio frequencies oscillator is ______
a. 0 to 20 Hz
b. 20 hz to 2 khz
c. 20 hz to 20 khz
d. 20 hz to 20 mhz
Answer: 20 hz to 2 khz
52. A liquid crystal display is required__________.
a. An AC drive
b. A DC drive
c. Both AC and DC drives
d. None of these
Answer: An AC drive
53. Optical sensors are the detectors used _____________.
a. Photodiodes
b. Phototransistors
c. Laser
d. Only (1) and (2)
Answer: Only (1) and (2)
54. Optical sensor used for displacement measurement works on the principal that _____________.
a. Light intensity increases with distance
b. Light intensity decreases with distance
c. Light intensity remains constant with distance
d. Light intensity increases with time
Answer: Light intensity decreases with distance
55. A capacitance sensor can measure very small
Displacement It can be created in different ways ______
a. Separation
b. Area
c. Permission
d. Either (1) or (2) or (3)
Answer: Either (1) or (2) or (3)
56. An instrument used for ionization gauges measurement of _____________
a. Too low pressure
b. Medium pressure
c. High pressure
d. Too high pressure
Answer: Too low pressure
57. A dead weight gauge is used for measurement by the pressure of _____________
a. About 1000 bars
b. About 2000 bar
c. About 5000 bar
d. About 7000 bar
Answer: About 7000 bar
58. Bourdon tube is used for measurement of calculating the pressure of _____________
a. Gas
b. Fluids
c. Solid
d. Only (1) and (2)
Answer: Only (1) and (2)
59. Potential Transformer Winding Resistance is reduced by using ___________________.
a. Thick conductors and short lengths of turns
b. Thin conductors and short lengths of turns
c. Thin conductors and long lengths of turns
d. Thicker conductors and longer lengths of turns
Answer: Thick conductors and short lengths of turns
60. is the nominal ratio for a current transformer given by ______
a. Primary winding current/rated secondary winding current
b. Number of turns/ of turns in the primary winding turns in the secondary winding
c. Number of turns/ of turns in the secondary winding turns in the primary winding
d. Rated secondary winding current/rated primary winding current
Answer: Primary winding current/rated secondary winding current
61. Suitable for moving iron power factor meters 3 phase balanced circuit. It includes ______
a. A control spring
b. Two control springs
c. Three control spring
d. No control spring
Answer: No control spring
62. If the frequency of the electrodynamic power factor the meter will then double its reading be_____________
a. Double the original reading
b. Half of the original reading
c. Four times the original reading
d. Remains unaffected
Answer: Remains unaffected
63. The frequency of the rotating iron is in meters _____________.
a. Two inductive circuits are connected in parallel
b. An inductive and a non-inductive circuit are connected parallel
c. Two non-inductive circuits are connected in parallel
d. An inductive and a non-inductive circuit are connected in the series
Answer: An inductive and a non-inductive circuit are connected parallel
64. Electrodynamic frequency meter is _____________.
a. Does not depend on linear scale and their reading electric pressure
b. Linear scales and their readings depend on voltage
c. Non-linear scales and their readings are not dependent on the voltage
d. Non-linear scales and their readings depend on voltage
Answer: Does not depend on linear scale and their reading electric pressure
65. Earth resistivity can be measured by ________
a. Collapse of Probability Method
b. Using an earth tester
c. Ducter ohmmeter method
d. Only (1) and (2)
Answer: Only (1) and (2)
66. Electrical equipment is generally earthed when someone avoids being shocked by an electrode touches the body of the device. the earth resistance is affected by _____
a. Depth of electrodes buried in soil
b. Size and material of earth electrode
c. Specific resistance of the soil around the electrode
d. All of these
Answer: All of these
67. When the voltmeter and ammeter method is applied to measure the resistance, read the voltmeter value of 8.28 v and ammeter reading is d.14 ma. then the value of resistance will be _____________.
a. 2 kω
b. 20 kΩ
c. 200 kω
d. 2000 kω
Answer: 200 kω
68. In AC bridges, Wagner earth devices are used that _________
a. Remove all earth potential from the bridge circuit
b. Remove the harmonics
c. Reduce the error caused by stray electric field
d. All of these
Answer: All of these
69. Shielding of the capacitor is done by _________
a. Determine the value of the capacitor
b. Balance the bridge without any difficulty
c. Both (1) and (2)
d. None of these
Answer: Both (1) and (2)
70. There are indicating devices with linear scales ______
a. Pmmc
b. Electrostatic instrument
c. Dynamometer instrument
d. Thermocouple instrument
Answer: Pmmc
71. Resistivity divider method and the capacitance potential divider method is used for _____________.
a. Both AC and DC
b. The former method can be used for both AC and DC and the the latter method can only be used for ac
c. The former method can only be used for AC and the latter the method can be used for both ac and dc
d. The former method can be used only for dc and the latter the method can only be used for ac
Answer: he former method can be used for both AC and DC and the the latter method can only be used for ac
72. An electrostatic voltmeter can have a range of expanded using
a. Resistance Potential Divider Method
b. Capacitance potential divider method
c. Both (1) and (2)
d. None of these
Answer: Both (1) and (2)
73. Multiplying factor of electrostatic voltmeter given by ______
a. ( c + c v ) / c
b. ( c + c v ) / c v
c. C / ( c + c v )
d. C v / ( c + c v )
Answer: ( c + c v ) / c
74. Iron is not used in electrostatic devices constructions are instruments of ______
a. Free from hysteresis and eddy current losses
b. Free from temperature errors
c. Depending on temperature errors
d. Both (1) and (2)
Answer: Both (1) and (2)
75. If an electrostatic voltmeter is used on an AC circuit and there are non-uniform waves, then it will read ______
a. Average values
b. Rms values
c. Peak values
d. All of these
Answer: Rms values
76. Electrostatic voltmeter instruments are suitable for _____________
a. Only Ac work
b. Only DC work
c. Both AC and DC work
d. None of these
Answer: Both AC and DC work
77. Kelvin's multicellular voltmeter has torsion ______ Head and Coach Spring for.
a. Protection against accidental degree of suspension due to vibration
b. For zero adjustment
c. For torsion head and coach spring for zero adjustment protection against accidental degree of suspension of payment to vibrate
d. Torsion head for protection against accidental damage suspension due to vibration and coach spring for zero adjustment
Answer: For torsion head and coach spring for zero adjustment protection against accidental degree of suspension of payment to vibrate
78. In electrostatic voltmeter, their principle operation is the force of attraction in electric charges on neighboring plates that between the potential the difference is maintained. Attract - disk type electrostatic devices are used for measurement of ______
a. Too low voltage
b. Low voltage
c. High voltage
d. Too high voltage
Answer: Too high voltage
79. Electrostatic devices are commonly used as _____________
a. Voltmeter
b. Ammeters
c. Wattmeters
d. Watt-hour meter
Answer: Voltmeter
80. If the quantity being measured remains constantc during the revision process there may be random errors after measurement removed by _____________
a. Calculating the mean of repeated numbers measurement
b. Calculating the mean of repeated numbers measurement
c. Calculating the sum of repeated numbers measurement
d. Either (1) or (2)
Answer: Either (1) or (2)
81. The error between the mean of a limited data set and an infinite data set means ______ is known as
a. Media's real fault
b. Standard error of the mean
c. Limited error
d. Infinite error
Answer: Standard error of the mean
82. In a measurement system,
a. A single unit of measure may contain both random error and systematic error
b. A measurement system consists of several components each element has separate errors
c. Statements (1) and (2) are both true
d. Neither statement (1) nor statement (2) is true
Answer: Statements (1) and (2) are both true
83. If the degree of damping of an instrument should be adjusted to an adequate value enable the pointer to be quickly deflected a condition without overshooting is called ______
a. Overdamped
b. Dead beat
c. Underdamped
d. None of these
Answer: Dead beat
84. Due to overdamping, the instrument will ____________
a. Slow down
b. Sluggish
c. Fast
d. Both (1) and (2)
Answer: Both (1) and (2)
85. While measuring resistance with voltmeter -ammeter method, maximum potential percentage the errors of voltmeter and ammeter are ± a.8% and ± a.2% respectively. Then maximum possible the value of the resistance will have a percentage error _____________.
a. ± 3%
b. ± 4%
c. ± d.2%
d. ± d.8%
Answer: ± 3%
86. If the resistance in the circuit is given by 80 ω ± 0.2% and the current flowing through it is 5a ± 0.1%, Then there will be uncertainty in power _____________.
a. ± 0.2 %
b. ± 0.4 %
c. ± 0.6 %
d. ± 0.8 %
Answer: ± 0.4 %
87. When 100 v is a rotating iron voltmeter used in accuracy class 1 - 0 circuits, it reads 50 v. the maximum possible percentage error in the latter reading is ______
a. 1 %
b. 2 %
c. 2.5 %
d. 3%
Answer: 2 %
88. In liquid crystal display, liquid crystal exhibits properties of ___________________
a. Liquid
b. Solid
c. Gas
d. Both (1) and (2)
Answer: Both (1) and (2)
89. In a light emitting diode, the available light the emitting region is _____________.
a. less than a.b.5 mm
b. From b.5 to 25 mm
c. More than 25 mm
d. More than 50 mm
Answer: From b.5 to 25 mm
90. The resolver works on the principal of mutual induction Variation. It is mainly used for measurement of _____________
a. Linear displacement
b. Non-linear displacement
c. Rotary motion
d. All of these
Answer: Rotary motion
91. In a rotary variable differential transformer, the mutual induction between primary and secondary the secondary coil changes the ____
a. Linear with angular displacement
b. Non-linear with angular displacement
c.With linear displacement
d. Non-linear with linear displacement
Answer: Linear with angular displacement
92. Lvdt is a tool for J a measure of displacement, acts on the principal of ______.
a. Linear superposition
b. Non-linear inductance
c. Mutual inductance
d. Linear Capacitance
Answer: Mutual inductance
93. Instruments used for measurement of the pressure is / are ___________________.
a. Ghungroo
b. Diaphragm
c. Fiber optic pressure sensors
d. All of these
Answer: All of these
94. Capacitive pressure sensors have a characteristic measurement Uncertainty _____________
a. One
b. Two
c. Three
d. Four
Answer: Four
95. If an instrument transformer is used to expand the range of the AC instrument, then its reading depending on ________
a. R
b. L
c. C
d. None of these
Answer: None of these
96. Potential transformers are used to measure using high voltage ______
a. High grade voltmeter
b. Low range voltmeter
c. High range ammeter
d. Low range ammeter
Answer: Low range ammeter
97. Vibration galvanometers are usually used ___________________
a. To measure electric charge
b. As null point detector in AC bridge
c. As null point detector in DC bridge
d. To measure power
Answer: As null point detector in AC bridge
98. Two watt meters used for measurement of power input read 50 kw each. what will be readings of two watt meters if the power factor the leading changed to 0.8 keeping the total input power the same?
a. 28.35w, 7a.65w
b. 3a.25w, 7c.71w
c. 3c.33rd, 7c.33rd
d. 38.35w, 75.5w
Answer: 28.35w, 7a.65w
99. For measurement of unknown inductance in given the known capacitance, a suitable AC bridge
are _____
a. Maxwell and Schering Bridge
b. Maxwell and Wien's bridge
c. Maxwell and Hayes Bridge
d. Hay's and Vienna's bridge
Answer: Maxwell and Hayes Bridge
100. Bridges of Vienna are perfect for this measurement of range frequency of ______
a. less than100 hz
b. 100 hz to 100 khz
c. 1 khz to 100 mhz
d. More than 100 mhz
Answer: 100 hz to 100 khz
101. ______________ Are there integrated tools?
a. Ammeters
b. Voltmeter
c. Watt meters
d. Ampere-hour and watt-hour meters
Answer: Ampere-hour and watt-hour meters
102. Resistance can be measured with the help of a ______________
a. Wattmeter
b. Voltmeter
c. Ammeter
d. Ohmmeter and resistance bridge
Answer: Ohmmeter and resistance bridge
103. _____________instruments indicate instantaneous the value of the electrical quantity being measured above at what time is it being measured?
a. Absolute
b. To indicate
c. Recording
d. Consolidation
Answer: To indicate
104. _____________ Tools are only used limited to laboratories as standardization tools
a. Absolute
b. To indicate
c. Recording
d. Consolidation
Answer: Absolute
105. _______________ instruments measure the total quantity electricity delivered at a particular time.
a. Absolute
b. To indicate
c. Recording
d. Consolidation
Answer: 4
106. Depending on the application, there may be tools classified in ____________ and ____________
a. Switch board
b. Portable
c. Both 1 and 2
d. Moving coil
Answer: Both 1 and 2
107. Spring material used in spring control the device must have the following properties:
a. Should be non-magnetic
b. Must have low-temperature co-operation
c. Must have low specific resistance
d. All of the above
Answer: All of the above
108. Which of the following properties of moist oil must have?
a. Must be a good insulator
b. Should be non-evaporative
c. Should not have corrosive action on metal Wayne
d. All of the above
Answer: All of the above
109. A_____________ Prevents oscillation of the device moving system and enables the latter to reach the final round Position quickly.
a. To distract
b. Control
c. Dampening
d. All of the above
Dampening
110. An induction meter can handle current Till now _____________
a. 10 a
b. 30 a
c. 60 a
d. 100 a
Answer: 100 a
111. To handle large current induction
Use of Wattmeter _____________ is done in conjunction with
a. Potential transformer
b. Current transformer
c. Power transformer
d. All of the above
Answer: Current transformer
112. Equipment can be used for _____________ extending the range of tools?
a. Shunt
b. Multiplier
c. Current transformer
d. All of the above
Answer: All of the above
113. A moving-coil permanent-magnet tool can to be used as a flux-meter _____________
a. Using a low resistance shunt
b. Using high series resistance
c. Removing the control springs
d. Making large moment of inertia control springs
Answer: Removing the control springs
114. A moving-coil permanent-magnet tool can use as _______________ using low resistance shunt.
a. Ammeter
b. Voltmeter
c. Flux-meter
d. Ballistic galvanometer
Answer: Ammeter
115. Potentiometer can be used __________
a. Measurement of resistance
b. Measurement of flow
c. Calibration of ammeter
d. All of the above
Answer: All of the above
116. _____________are not used on DC circuit
a. Mercury motor meter
b. Commutator motor meter
c. Induction meter
d. None of the above
Answer: Induction meter
117. _____________ Motor is an essential part of the meter.
a. An operating torque system
b. A barking instrument
c. Revolution registration device
d. All of the above
Answer: All of the above
118. Induction type single phase energy meter measurement of electrical energy
a. Kw
b. Wh
c. Kwh
d. Above
5. None of the above
Answer: Kwh
119. The pointer should be a pointer to the instrument to be ______
a. Too light
b. Too heavy
c.Either 1 or 2
d. Neither 1 nor 2
Answer: Too light
120. A domestic energy meter is ______
a. Indicating device
b. Recording instrument
c. Integrating tool
d. None of the above
Answer: Integrating tool
121. The chemical effect of electric current is used in ______
a. D.C. ammeter hour meter
b. D.D. ammeter
c. D.C. Energy meter
d. None of the above
Answer: D.C. ammeter hour meter
122. In most instruments, damping is provided by ______
a. Fluid friction
b. Spring
c. Eddy currents
d. All of the above
Answer: Eddy currents
123. Ammeter is a __________ instrument.
a. Secondary instrument
b. The perfect instrument
c. Recording instrument
d. Integrating Instrument
Answer: Secondary instrument
124. Switchboard devices should be installed in ________ position.
a. Vertical
b. Horizontal
c. Either 1 or 2
d. Neither 1 nor 2
Answer: Vertical
125. An ammeter has a shunt function _____________
a. By passing current
b. Increase the sensitivity of the ammeter
c. Increase the resistance of the ammeter
d. None of the above
Answer: By passing current
126. Multiplier and meter-coil in voltmeter inside are ______.
a. Series
b. Parallel
c. Series-parallel
d. None of the above
Answer: Series
127. A moving iron device can be used for this.
a. D.C. only
b. A.C. only
c. Both D.C. and A.C.
d. None of the above
Answer: Both D.C. and Answer: C.
128. The scale of a rectifier instrument is ______
a. Linear
b. Non-linear
c. Either 1 or 2
d. Neither 1 nor 2
Answer: Linear
129. To measure current at high frequency, you need use ______.
a. A moving iron tool
b. Electrostatic instrument
c. Thermocouple instrument
d. None of the above
Answer: Thermocouple instrument
130. resistance in the circuit of the rotating coil of the dynamometer should be ______
a. Zero
b. Less
c. High
d. None of the above
Answer: High
Comments
Post a Comment