Bonded resistance wire strain gauge is of _______
1. 7 types
2. 5 types
3.3 types
4. 9 types
Gauge factor for a semiconductor strain gauge is _______
1.130 ± 10%
2.30 ± 10%
3. 200 ± 10%
4.10 ± 10%
In a foil strain gauge, strain is detected through _______
1.a capacitance element
2.a resistance wire
3.a gold foil
4.a metal foil
In a temperature sensing element _____
1. low value of α is required
2.infinite value of α is required
3.α must be zero
4.high value of α is required
Load cell is used for the measurement of _______
1.area
2.force
3.mass
4.length
Load cells are calibrated such that _______
1.force varies inversely with resistance
2.force varies as the square of resistance
3.force remains constant with resistance
4. force varies directly with resistance
Strain gauges are used for ______
1. small scale measurements
2.dynamic measurements
3.static measurements
4.large scale measurements
Thermistor has low resistance.
1.True
2. False
3.all of the above
4.None of the mentioned
A semiconductor strain gauge consists of how many dummy gauges?
1.2
2.4
3.6
4.10
A Wheatstone bridge has _______
1. low sensitivity
2.zero sensitivity
3.high sensitivity
4. infinite sensitivity
At small values of voltage, a thermistor _____
1.reaches peak current slowly
2. reaches peak current immediately
3. does not reaches peak current
4.reaches peak current intermediately
Change in resistance is measured using a _______
1. Anderson’s bridge
2.Wheatstone’s bridge
3.Hay’s bridge
4. Maxwell’s bridge
Commonly used electrical strain gauge is _______
1.open type
2.closed type
3. unbounded type
4.bonded type
Electrical strain gauges measure changes in _______
1.resistance, capacitance and inductance
2.resistance only
3. capacitance only
4. inductance only
Etched foil strain gauges are flexible.
1. True
2. False
3.all of the above
4.None of the mentioned
Gauge factor in a strain gauge must be ______
1.high
2. low
3. medium
4. small
How can corrosion be prevented in a resistance thermometer?
1.by immersing the setup in oil
2.by enclosing the elements in a glass tube
3.by using guard rings
4.by painting the elements
Hysteresis characteristics of a semiconductor strain gauge are poor.
1. True
2.False
3.all of the above
4.None of the mentioned
If the sensing element is large, then less amount of heat is required.
1. True
2.False
3.all of the above
4.None of the mentioned
In metallic gauges resistance changes due to _______
1.temperature
2.current
3. voltage
4.dimension
Load cell is sensitive to minute strains.
1.True
2.False
3.all of the above
4.None of the mentioned
Mass of only about 20 kg can be measured by a load cell.
1. True
2. False
3.all of the above
4.None of the mentioned
Mechanical gauges measure the _______
1. change in resistance
2.change in length
3. change in area
4. change in inductance
Metals in strain gauge construction have _______
1.non-linear temperature coefficient
2.linear temperature coefficient
3.tangential temperature coefficient
4.exponential temperature coefficient
Most metallic conductors have a ______
1.neutral temperature coefficient of resistance
2.negative temperature coefficient of resistance
3.positive temperature coefficient of resistance
4.zero temperature coefficient of resistance
Nickel and its alloys can be used over a temperature range of _____
1.100 to 450 K
2. 10 to 50 K
3. 0 to 25 K
4.5 to 15 K
Optical gauges make use of _______
1.pulleys
2.electricity
3.mirrors
4.rack and pinion
Platinum is used for industrial applications because ______
1. it is cheap
2.it is available readily
3. it is a noble metal
4.it gives accurate measurements
Proper bonding causes errors in strain gauges.
1. True
2. False
3.all of the above
4.None of the mentioned
Relation between temperature and resistance of a conductor is ________
1. Rt = Rref [1+t]
2.Rt = Rref [1+α∆t]
3. Rt = Rref [1-αt]
4.Rt = Rref [1-t]
Resistance of the strain gauge must be _____
1.zero
2.small
3. large
4.medium
Resistance temperature detector is _____
1.a electrical transducer
2.a mechanical transducer
3.a chemical transducer
4.a physical transducer
Resistance thermometer provides the change in electrical resistance.
1.True
2.False
3.all of the above
4.None of the mentioned
Resistance wire gauges come in _______
1.4 forms
2.2 forms
3.6 forms
4.8 forms
Semiconductor strain gauge uses _______
1.rectifier circuitry
2.power electronics circuitry
3.ordinary bridge circuit
4.bridge circuit with temperature compensation
Semiconductor strain gauges are used for _______
1.low gauge factor values
2.high gauge factor values
3. zero gauge factor value
4.infinite gauge factor value
Sensing element in the thermometer must provide ________
1.small change in resistance
2.no change in resistance
3. large change in resistance
4.infinite change in resistance
Strain gauge has a ______
1.tangential
2. exponential
3.non-linear
4.linear
Strain gauge has a _______
1.low temperature coefficient of resistance
2. high temperature coefficient of resistance
3.zero temperature coefficient of resistance
4.infinite temperature coefficient of resistance
Strain gauge measurement involves _______
1.Wheatstone bridge
2.Kelvin bridge
3.De Sauty’s bridge
4.Anderson bridge
Strain gauge works on the principle of _______
1.piezo-electric effect
2.barkhausen criterion
3.piezo- resistive effect
4. feedback element effect
Strain gauges are classified into ________
1.3 types
2.5 types
3.7 types
4.9 types
Strain is a ______
1.fractional change in volume
2.fractional change in area
3. fractional change in length
4.fractional change in height
Tensile stress decreases the length.
1.True
2. False
3.all of the above
4.None of the mentioned
Thermistor follows which law for small variations ________
1.Charle’s law
2.KVL
3.KCL
4.Ohm’s law
Thermistor has a resistance of ____
1.250 ῼ to 500 kῼ
2. 50 ῼ to 10 kῼ
3.1 ῼ to 1 kῼ
4.100 ῼ to 100 kῼ
Thermistor is a contraction ______
1.thermal resistor
2. laser resistor
3. electric resistor
4.mechanical resistor
Thermistor material is pressed _____
1.under zero pressure
2.under low pressure
3.under high pressure
4.under low volume
Thermistors are suited for precision temperature measurements.
1. True
2.False
3.all of the above
4.None of the mentioned
Thermistors have ______
1.positive temperature coefficient
2.negative temperature coefficient
3. zero temperature coefficient
4. infinite temperature coefficient