Lissajous pattern shown in double-beam cathode-ray oscilloscope screen for two sinusoidal voltages of equal magnitude and of the same frequency but of phase shift of 30° electrical is
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ECE · all questionsMeasurement And Instrumentation
Measurement And Instrumentation
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The meter suitable for only DC measurement
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What will be seen on the screen of a CRO, when a sinusoidal voltage signal is applied to the vertical deflection plate of this CRO with no simultaneous signal applied to the horizontal deflection plate?
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A 0-300 V Voltmeter has an error of ±2% of full deflection. What would be the range of readings if true voltage is 30 V?
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A sinusoidal voltage of amplitude 150 V has been applied to a circuit having a rectifying device and prevents flow of current in one direction and offers a resistance of 15 Ω for the flow of current in the other direction. If hot wire type and PMMC type instruments are connected in this circuit to measure the electric current, their readings would respectively be:
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A popular method of increasing the range of an ac instrument is use of
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A liquid flows through a pipe of 100 mm diameter at a velocity of 1 m/s. If the diameter is guaranteed within ±1% and the velocity is known to be within ±3% of measured value, the limiting error for the rate of flow is
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Which of the following methods are used for producing damping torque in analog instruments?
1. Air friction damping
2. Fluid friction damping
3. Eddy current damping
4. Electromagnetic damping
1. Air friction damping
2. Fluid friction damping
3. Eddy current damping
4. Electromagnetic damping
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Majority of digital voltmeter are built with a dual - slope ADC because:
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The Wein bridge circuit shown in the figure below can be used as a frequency measuring device, provided
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The torque transmitted by a cylindrical shaft is to be measured by using two strain gauges. The angles for mounting the strain gauges relative to the axis of the shaft for maximum sensitivity are
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Which of the following methods can be used for measuring power without using wattmeter.
1. One voltmeter, one ammeter
2. Two voltmeters, two ammeters
3. Three voltmeters
4. Three ammeters
1. One voltmeter, one ammeter
2. Two voltmeters, two ammeters
3. Three voltmeters
4. Three ammeters
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A vibration galvanometer is tunded:
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The Q-factor measures
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Consider the ammeter-voltmeter method of determining the value of the resistance R using the circuit shown in the figure. The maximum possible errors of the voltmeter and ammeter are known to be 1% and 2% of their readings, respectively. Neglecting the effects of meter resistances, the maximum possible percentage error in the value of R determined from the measurements, is:
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Which of the following is used to measure the leakage resistance of a capacitor?
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A piezoelectric crystal having a thickness of 2 mm and a voltage sensitivity of 0.02 V-m/N is subjected to a pressure of 20 × 103 Pa. What is the output voltage?
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In orifice meter, vena contracta is a position where . . . . . . . . is maximum and . . . . . . . . is minimum.
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On an induction type energy meter, is written "600 rev/kWh". If it is to be used an approximate wattmeter which is read off in rpm, a 600 watt load would read as
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Q100
Open questionA d.c. circuit can be represented by a voltage source of 10 V in series with an output resistance of 1 kΩ. An ammeter of 50 Ω resistance is connected to the source terminals for measurement of current. The accuracy of measurement is nearly
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