Electrical Measurement and Measuring Instruments (3160915) MCQs

MCQs of Transducers and Sensors

Showing 71 to 80 out of 85 Questions
5 6 7 8 9
71.

Thermocouple must provide ________

(a)

small thermo e.m.f
(b)

sufficient thermo e.m.f
(c)

no thermo e.m.f
(d)

infinite thermo e.m.f
Answer:

Option (b)

72.

Most suitable material for a thermocouple is ________

(a)

brass
(b)

gold
(c)

platinum
(d)

silver
Answer:

Option (c)

73.

Which of the following should satisfy for measuring higher temperatures using a thermocouple?

(a)

no wire is required
(b)

wire must be small
(c)

wire must be thin
(d)

wire must be heavy
Answer:

Option (d)

74.

For accurate temperature measurement in a thermocouple the __________

(a)

cold compensation is needed
(b)

hot compensation is needed
(c)

no compensation is needed
(d)

hot and cold compensations are needed
Answer:

Option (a)

75.

Piezoelectric transducer is used for measuring __________

(a)

non-electrical quantities
(b)

electrical quantities
(c)

chemical quantities
(d)

any quantity
Answer:

Option (a)

76.

Piezoelectric crystals __________

(a)

float on water
(b)

dissolve in water
(c)

are not soluble in water
(d)

absorb water
Answer:

Option (b)

77.

Piezoelectric crystals produce _________

(a)

no voltage
(b)

low voltage
(c)

high voltage
(d)

very high voltage
Answer:

Option (c)

78.

Piezoelectric transducer consists of _________

(a)

copper rod
(b)

aluminum wire
(c)

gold crystal
(d)

quartz crystal
Answer:

Option (d)

79.

When a compressive force is applied to a quartz crystal then ____________

(a)

positive charges are induced
(b)

negative charges are induced
(c)

no charge is induced
(d)

both positive and negative charges are induced
Answer:

Option (a)

80.

 In kitchen applications a piezoelectric crystal is used for _________

(a)

skimming milk
(b)

lighting a gas stove
(c)

grinding
(d)

mixing
Answer:

Option (b)

Showing 71 to 80 out of 85 Questions
5 6 7 8 9