Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

As per BIS, the number of accuracy classes of instrument is
A:
5
B:
6
C:
7
D:
8
Answer: D

8 losses.

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For measurement of surface temperature of solids the elements of RTD is usually in the shape of
A:
bar
B:
coil
C:
flat grid
D:
either (a) or (b)
Answer: C

The flat grid is attached to the surface of solid.

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Which of the following methods can be used to measure power in a single phase circuit without using wattmeter?
  1. One voltmeter, one ammeter
  2. Two voltmeters, two ammeter
  3. Three voltmeters
  4. Three ammeters
A:
1 and 2 only
B:
2 and 4 only
C:
1 and 3 only
D:
3 and 4 only
Answer: D

Single phase power can be measured using either 3 voltmeters or 3 ammeters.

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In measuring a resistance by voltmeter-ammeter method, the voltmeter can be connected either across supply or across the resistance. If the resistance is low, the voltmeters should be connected
A:
across the supply
B:
across the resistance
C:
either in two positions
D:
preferably across the supply
Answer: B

Since resistance is low current is high and voltage drop across ammeter is high. Therefore, voltmeter should be connected across resistance.

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A moving coil meter has a resistance of 50 ohms and a full scale deflection current of 20 mA. To convert it into a voltmeter of 0-100 V range, the series resistance should be
A:
5000 Ω
B:
5050 Ω
C:
4950 Ω
D:
505 Ω
Answer: C

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