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Mission ISRO 2019: Measurements Quiz 2
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Question 1
The setup in the figure is used to measure resistance R. The ammeter and voltmeter resistance are 0.01 Ω and 2000 Ω respectively. Their readings are 2 A and 180 V respectively, giving a measured resistance of 100 Ω. The percentage error in the measurement is _________.
Question 2
A dc potentiometer is designed to measure up to about 2V with a slide wire of 800 mm. A standard cell of emf 1.18 V obtains balance at 600 mm. A test cell is seen to obtain balance at 650 mm. The emf of the test cell is ____ V.
Question 3
The figure shows the circuit of a rectifier type voltmeter. The diode 
1) Does not allow any current to flow through meter during negative half cycle.
2) Does not allow reverse leakage current to flow through the meter during negative half cycle.
3) Short circuits the meter during negative half cycle.
Which of these statements are correct?
1) Does not allow any current to flow through meter during negative half cycle.
2) Does not allow reverse leakage current to flow through the meter during negative half cycle.
3) Short circuits the meter during negative half cycle.
Which of these statements are correct?
Question 4
When a sinusoidal signal of 220 V, 50 Hz on CRO produces a vertical deflection of 2 cm at a particular setting of the vertical gain control, what would be the value of the voltage to be applied to produce a deflection of 3 cm for the same vertical gain?
Question 5
A meter measures a known voltage of 100 A. The values for the five readings were indicated as: 105, 104, 105, 106, 104. Which of the following statement is true for the meter?
Question 6
The readings given below were obtained during the measurement of a low resistance using a potentiometer: Voltage drop across a 0.3 Ω standard resistance = 1.0567 V Voltage drop across the low resistance under test = 0.2305 V Calculate the value of unknown resistance, current and power loss in it.
Question 7
A shunt-type ohmmeter uses a 3-mA basic d’Arsonval movement with an internal resistance of 20 Ω. The battery emf is 3 V. Calculate A. value of the resistor in series with the battery to adjust the FSD, and (b) at what point (percentage) of full-scale will 80 Ω be marked on the scale?
Question 8
A moving coil instrument has a resistance of 3 Ω and gives a full-scale deflection of 8 mV. Show how the instrument may be used to measure voltage up to 30 V and current up to 8A.
Question 9
If the resistance of a thermistor is 150 Ω at 30 °C and 50 Ω at 60 °C, determine the resistance temperature coefficient.
Question 10
A resistance strain gauge has an original resistance of 150 Ω. When a strain of 2 × 10-6 is applied to the gauge, the resistance changes by 900 µΩ. Determine the gauge factor.
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Jul 29ESE & GATE EE
