Measurement MCQs Part-11

Measurement MCQs

Multiple Choice question(MCQs) on transducers

1. A thermocouple is  used to measure in the range of 700^oC to 800^oC. Select the pair that would be most suitable for the applications.

a. Iron-constantan

b. Platinum-platinum + rhodium

c. Copper-constantan

d. Chromel-alumel

 

2. The transducer suited for high temperature and fast response time is a ________.

a. Bimetallic strip

b. Thermocouple

c. Thermistor

d. RTD

 

3. Rota meter is a flow meter based on_________.

a. Variable pressure

b. Variable length

c. Variable area

d. None of these

 

4. In a thermocouple element, heat energy transferred to the hot junction is converted into electrical energy by_______.

a. Seebeck effect

b. Johnson's effect

c. Faraday's effect

d. Hall effect

 

5. Which of the following is not a pair of active transducers?

a. LVDT and potentiometer

b. Photo-voltaic cell and thermocouple

c. Piezoelectric transducer and tachnogenerator

d. Accelerometer and thermocouple

 

6. RTD is / an ________.

a. Capacitive transducer

b. Inductive transducer

c. Passive transducer

d. Active transducer

 

7. A thermistor is inherently suitable temperature measurement involving_______.

a. Low span and low sensitivity

b. High span and high sensitivity

c.Low span but high sensitivity

d. High span but low sensitivity

 

8. While selecting a transducer for a particular application________.

a. Input, output and transfer characteristics should be considered

b. Only the input characteristics should be considered

c. Only the transfer characteristics should be considered

d. Only the output characteristics should be considered

 

9. Capacitive transducers are generally used for ________.

a. Static measurement

b. Dynamic measurement

c. Transient measurement

d. Both static and dynamic measurement

 

10. Ceramic materials used for piezo-electric transducers_______.

a. Are basically made of barium titanate

b. Are polycrystalline in nature

c. Do not have piezo-electric properties in their original state, but these properties are produced by special polarizing treatment

d. All of the above

 

11. The rotor of a synchro-transmitter_________.

a. May use either salient or cylindrical type of construction

b. Uses a cylindrical pole type of construction

c. Uses a salient pole type of construction

d. None of the above

 

12. The lower limit of useful working range of a transducer is determined by_______.

a. Minimum useful input level

b. By transducer error and noise

c. Dynamic response

d. Cross sensitivity

 

13. Measurement of power at high frequencies and thermal conductivity is determined by______.

a. Thermocouple

b. LVDT

c. Thermistor

d. None of these

 

14. Rochelle salt is a crystalline material used in producing___________.

a. Differential transformer transducer

b. Piezoelectric transducer

c. Photoelectric transducer

d. Velocity transducer

 

15. Measurement of flow, thermal conductivity and liquid level using thermistors make use of __________.

a. Change of resistivity

b. Self-heating phenomenon

c. Resistance increase with temperature

d. Resistance decrease with temperature