Electronics and Communication Engineering - Electronic Devices and Circuits
Exercise : Electronic Devices and Circuits - Section 4
- Electronic Devices and Circuits - Section 1
- Electronic Devices and Circuits - Section 2
- Electronic Devices and Circuits - Section 3
- Electronic Devices and Circuits - Section 4
- Electronic Devices and Circuits - Section 5
- Electronic Devices and Circuits - Section 6
- Electronic Devices and Circuits - Section 7
- Electronic Devices and Circuits - Section 8
- Electronic Devices and Circuits - Section 9
- Electronic Devices and Circuits - Section 10
46.
Hay's bridge is suitable for inductances having low L/R ratio.
Answer: Option
Explanation:
It is suitable for high 
ratio inductances.
47.
Moving iron instrument can be used for ac only.
Answer: Option
Explanation:
Moving iron instruments can be used for both dc and ac.
48.
In electronic voltmeters the measuring device is a
Answer: Option
Explanation:
The a.c. voltage is rectified and measured by PMMC instrument.
49.
An ammeter has a resistance of 50 ohms and a shunt of 0.01 Ω. The deflection is θ. If the shunt resistance is increased to 0.02 Ω, the deflection will be.
Answer: Option
Explanation:
Since shunt resistance is doubled, current through ammeter is doubled (current division for resistances in parallel). Therefore reading is 2 θ.
50.
The ac bridge in figure is balanced. Z1 = 100∠30°, Z2 = 150∠0°, Z3 = 250∠ - 40° Then Z4 =
Answer: Option
Explanation:
.
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