61. In dc potentiometer measurements, a second reading is often taken after reversing the polarities of dc supply and the unknown voltage, and the average of the two readings is taken. This is done to eliminate the effects of
(a) ripples in, the dc supply.
(b) stray magnetic fields.
(c) stray thermal emfs.
(d) erroneous standardization.
Answer: (c) stray thermal emfs.
62. Consider the following statements. DC potentiometer is the best means available for measurement of dc voltages because
- The precision in measurement is independent of the type of detector used.
- It is based on null-balance technique.
- It is possible to standardize before a measurement is undertaken.
- It is possible to measure dc voltages ranging in value from mV to hundreds of volts.
Of these statements
(a) 2 and 3 are correct.
(b) 1 and 4 are correct.
(c) 2 and 4 are correct.
(d) 3 and 4 are correct.
Answer: (c) 2 and 4 are correct.
63. Maxwell inductance bridge is used for coils of Q value
(a) less than 1.
(b) less than 10.
(c) greater than 1 and less than 10.
(d) more than 100.
Answer: (c) greater than 1 and less than 10.
64. In an Anderson bridge, the unknown inductance is measured in term of known
(a) resistance.
(b) capacitance.
(c) inductance and resistance.
(d) resistance and capacitance.
Answer: (d) resistance and capacitance.
65. Hay’s bridge is suitable for the measurement of which one of the following ?
(a) Inductance with Q < 10.
(b) Inductance with Q > 10.
(c) Capacitance with high dissipating factors.
(d) Capacitance with low dissipating factors.
Answer: (b) Inductance with Q > 10.
66. Which of the following bridges can be used for inductance measurement ?
- Maxwell bridge.
- Hay’s bridge.
- Wein bridge.
- Wheatstone bridge.
Select the correct answer using the code given below:
(a) 1 and 2
(b) 2 and 3
(c) 3, 4 and 5
(d) 1 and 4
Answer: (a) 1 and 2
67. Inductance is measured by which one of the following?
(a) Wien bridge.
(b) Schering bridge.
(c) Maxwell bridge.
(d) Owen bridge.
Answer: (c) Maxwell bridge.
68. An imperfect capacitor is represented by a capacitance C in parallel with a resistance R. The value of the dissipation factor tan δ is
(a) ωCR
(b) ω2CR
(c) 1/ω2CR
(d) 1/ωCR
Answer: (a) ωCR
Electrical Measurements Questions and Answers pdf
- Electrical and Electronics Measurement Mcq – 1
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