Measurements and Instrumentation
Which of the following are needed both for protection and metering?
Answer: B
Instrument transformers are used to measure high currents and voltages. They also feed the relays for protection.
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In a strain measuring device using a strain gauge, the output quantity is
Answer: A
The measurement is done using an unbalanced bridge.
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Assertion (A): Shunt of an ammeter has a low resistance.
Reason (R): Shunt may be connected in series or in parallel with ammeter.
Answer: C
Shunt is always connected in parallel with ammeter.
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An accelerometer has a seismic mass of 0.05 kg and spring constant of 3 x 105 N/m. If maximum displacement of mass is ± 1 mm, the maximum acceleration which can be measured is
Answer: B
0.05 x a = 3 x 103 x 10-3 or a = 60 m/s2.
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The angle δ for a mica capacitor is about
Answer: D
Mica capacitor has very low loss and loss angle δ is very very small.
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In a CRO which of the following is not a part of electron gun
Answer: D
Electron gun consists of cathode, grid and accelerating anode.
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In Schering bridge, the potential of detector above earth potential is about
Answer: A
136.
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A single element strain gauge bridge has two fixed resistances R1 and R1 of 120 Ω each and a variable resistance which gives full deflection at 120 Ω for zero strain and 120.6 Ω for straine e. If gauge factor is 2, strain e is
Answer: A
.
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Assertion (A): When a wattmeter is used for low impedance loads, the pressure coil is connected across the load.
Reason (R): A wattmeter measures apparent power.
Answer: C
Wattmeter measures active power.
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A single element strain gauge bridge has two fixed resistances R1 and R1 of 120 Ω each and a variable resistance which gives full deflection at 120 Ω for zero strain and 120.6 Ω for straine e. If gauge factor is 2, strain e is
Answer: A
.
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