WorksheetsEDJ27203 Quiz 2 Set 2
Total questions: 16
Worksheet time: 25mins
Name
Class
Date
1.
Q1. What is the primary physical principle underlying the operation of a Resistance Temperature Detector (RTD)?
a)
Generation of voltage at a junction of dissimilar metals.
b)
Proportional change in resistivity of a semiconductor.
c)
Proportional change in electrical resistance of a pure metal with temperature.
d)
Change in volume of a liquid due to thermal expansion.
2.
Q2. A temperature change of 50∘C is equivalent to what temperature change in Fahrenheit (Δ∘F)?
a)
50∘F
b)
90∘F
c)
122∘F
d)
32∘F
3.
Q3. Which characteristic is a major disadvantage of using a thermistor for precise temperature measurement over a very wide range?
a)
Its low sensitivity at room temperature.
b)
It requires a cold junction compensation.
c)
Its highly non-linear relationship between resistance and temperature.
d)
Its susceptibility to electromagnetic interference (EMI).
4.
Q4. What is the function of Cold Junction Compensation (CJC) in a thermocouple circuit?
a)
To lower the temperature of the reference junction.
b)
To electrically compensate for the reference junction's voltage based on its measured temperature.
c)
To heat the measurement junction to avoid condensation.
d)
To convert the voltage output into a current signal.
5.
Q5. A thermistor changes from 10kΩ to 5kΩ as T increases from 25∘C to 50∘C. Calculate the average temperature coefficient (αavg).
a)
0.005/∘C
b)
−0.004/∘C
c)
0.008/∘C
d)
−0.002/∘C
6.
Q6. Which material is most commonly used in high-accuracy RTD construction due to its stability?
a)
Nickel
b)
Copper
c)
Tungsten
d)
Platinum
7.
Q7. A thermocouple generates 15mV at 200∘C and 30mV at 400∘C. Calculate its average sensitivity (Seebeck coefficient) in μV/∘C.
a)
7.5μV/∘C
b)
750μV/∘C
c)
150μV/∘C
d)
75μV/∘C
8.
Q8. What is the standard SI unit for Young's Modulus (E)?
a)
Newton (N)
b)
dimensionless (ratio)
c)
Pascal (Pa) or N/m2
d)
Ohm (Ω)
9.
Q9. The lateral strain divided by the axial strain when a material is pulled by a tensile force is known as:
a)
Gauge Factor
b)
Stress
c)
Young's Modulus
d)
Poisson's Ratio
10.
Q10. A strain gauge operates based on piezoresistivity. What does this mean?
a)
Material generates a voltage when strained.
b)
Electrical resistance of the material changes when mechanical strain is applied.
c)
Material changes color when stressed.
d)
Material produces light when a current flows.
11.
Q11. A metallic strip is 2m long. If its length increases by 0.8mm, calculate the resulting Strain (ϵ) in μϵ.
a)
40μϵ
b)
400μϵ
c)
4000μϵ
d)
0.4μϵ
12.
Q12. A rod with A=500mm2 is subjected to σ=150MPa. Calculate the compressive Force (F) applied in kN.
a)
75N
b)
300N
c)
75kN
d)
300kN
13.
Q13. A quarter-bridge strain gauge circuit with Vs=5V requires Vout=1.0mV for ϵ=1000μϵ. Calculate the Gauge Factor (GF) required.
a)
1.2
b)
1.8
c)
0.8
d)
2
14.
Q14. An Aluminum beam (E=70GPa) has a maximum ϵ=800μϵ. Calculate the corresponding Stress (σ) developed in MPa.
a)
560MPa
b)
56MPa
c)
5.6MPa
d)
5600MPa
15.
Q15. The Quarter-Bridge strain gauge configuration uses:
a)
Four active strain gauges for maximum sensitivity.
b)
Two active strain gauges.
c)
One active strain gauge and three fixed resistors.
d)
One active strain gauge and three RTDs.
16.
Q16. Compared to a Thermistor, a Thermocouple (Type K) is typically selected when the primary measurement requirement is:
a)
Highest possible sensitivity at room temperature.
b)
Measurement over a very wide temperature range, including high temperatures (e.g., up to 1200∘C).
c)
Highest linearity for industrial control systems.
d)
Easiest to interface with digital circuits.
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