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Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 4
36.
An amplifier has to amplify pulses of 1 H-s duration. The minimum bandwidth of amplifier must be
10 kHz
10 MHz
1 kHz
1 MHz
Answer: Option
Explanation:

Time period of 1 μs corresponds to frequency of 1 MHz.

37.
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
5000 Ω
5050 Ω
4950 Ω
505 Ω
Answer: Option
Explanation:

.

38.
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
across the supply
across the resistance
either in two positions
preferably across the supply
Answer: Option
Explanation:

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

39.
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
1 and 2 only
2 and 4 only
1 and 3 only
3 and 4 only
Answer: Option
Explanation:

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

40.
For measurement of surface temperature of solids the elements of RTD is usually in the shape of
bar
coil
flat grid
either (a) or (b)
Answer: Option
Explanation:

The flat grid is attached to the surface of solid.

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