Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

Four terminal approach is used in measuring low resistance because it
A:
eliminates thermoelectric energy
B:
eliminates stray capacitance
C:
eliminates stray inductance
D:
eliminates the effect of leads and contacts
Answer: D
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In semiconductor strain gauge
A:
resistance increases with strain
B:
resistance decreases with strain
C:
resistance increases with strain in p type and decreases with strain in n type
D:
resistance increases with strain in n type and decreases with strain in p type
Answer: C
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A Q meter uses the principle of
A:
variation of self inductance
B:
variation of mutual inductance
C:
series resonance
D:
none of the above
Answer: C
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The dimensions of permittivity are
A:
L-3M-1T2Q2
B:
L-1M-1T2Q2
C:
L2MT-1Q-1
D:
L-2M-1T2Q2
Answer: A
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An electrodynamometer instrument has the advantage of
A:
freedom from hysteresis and eddy currents because air cored coils are used
B:
freedom from hysteresis and eddy currents because cores of coils have special ferromagnetic material
C:
high torque/weight ratio
D:
low cost
Answer: A
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