Measurement
Trending Questions
Q. A modified Wheatstone bridge is used to measure the value of load resistance RL shown in figure. The resistance RX is varied such that balance is obtained, then value of branch parameters are as follows
Ra=140Ω; Rb=0.75Ω;
R1=70Ω; R2=180Ω;
R3=0.375Ω
Determine the value of RX

Ra=140Ω; Rb=0.75Ω;
R1=70Ω; R2=180Ω;
R3=0.375Ω
Determine the value of RX

- 0.1246Ω
- 0.2438Ω
- 0.4625Ω
- 0.9642Ω
Q. In the Wheatstone bridge in figure, each resistance is increased by 0.05%. The value of V0 will be


- 50 mv
- 0 mv
- 5 mv
- 0.1 mv
Q. For a given frequency, the deflecting torque in an induction type ammeter is directly proportional to
- current2
- current3
- √current
- current
Q. A DC ammeter has a resistance of 0.1Ω and its current range is 0−100A. If the range is to be extended to 0−500A, then meter requires the following shunt resistance
- 0.010Ω
- 0.011Ω
- 0.025Ω
- 1.0Ω
Q. An ammeter has a current range of 0-5 A, and its internal resistance is 0.2Ω. In order to change the range to 0−25A , we need to add a resistance of
- 0.8Ω in series with the meter
- 1.0Ω in series with the meter
- 0.04Ω in parallel with the meter
- 0.05Ω in parallel with the meter
Q. When the voltage across a battery is measured using a dc potentiometer, the reading shows 1.08 V. But when the same voltage is measured using a Permanent Magnet Moving Coil (PMMC) voltmeter, the voltmeter reading shows 0.99 V. If the resistance of the voltmeter is 1100 Ω, the internal resistance of the battery, in Ω is
- 100
Q. A galvanometer with a full scale current of 10 mA has a resistance of 1000Ω. The multiplying power (the ratio of measured current to galvanometer current) of 100Ω shunt with this galvanometer is
- 110
- 100
- 11
- 10
Q. A moving coil instrument having a resistance of 10Ω, gives a full-scale deflection when the current is 10 mA. What should be the value of the series resistance, so that it can be used as a voltmeter for measuring potential difference up to 100 V?
- 9990Ω
- 990Ω
- 9Ω
- 99Ω
Q. A PMMC voltmeter is connected across a series combination of a DC voltage source V1=2V and AC voltage source V2(t)=3sin(4t)V. The meter reads
- 2 V
- 5 V
- (2+√3/2)V
- √17/2)V
Q. The value of series resistance to be used to extend ( 0- 200) V range voltmeter having 2000 Ω/V sensitivity to be extended to ( 0-2000) V range.
- 3600 kΩ
- 5500 kΩ
- 3400 kΩ
- 4500 kΩ