Q141
Open questionWattmeter is of
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ECE · all questionsMeasurement And Instrumentation
Measurement And Instrumentation
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Q142
Open questionA capacitance of 250 pF produces resonance with a coil at a frequency of while at the second harmonic of this frequency, resonance is produced by a capacitance of 50 pF the coil will be nearly
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Q143
Open questionAn average response rectifier type electronic voltmeter has a d.c. voltage of 10 V applied to it. What is the meter reading?
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Q144
Open questionIf retrace is visible on the CRT screen, the trouble may be that
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Q145
Open questionOTDR is the acronym for:
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Q146
Open questionGiven x(t) = 3sin(1000πt) and y(t) = 5cos(1000πt + π/4). The x-y plot will be:
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Q147
Open questionFor a particular material the Hall coefficient was found to be zero. The material is
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Q148
Open questionUnder identical values of cold and hot junction temperatures, which thermocouple gives the highest output?
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Q149
Open questionThe most suitable primary standard for frequency is:
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Q150
Open questionTwo milli ammeters with full scale currents of 1 mA and 10 mA are connected in parallel and they read 0.5 mA and 2.5 mA respectively. Their internal resistance are in the ratio of
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Q151
Open questionMatch List-I with List-II and select the correct answer using the options given below:
| List-I (Measuring bridge) | List-II (Application) |
| a. Kelvin Double Bridge | 1. Capacitance |
| b. Wien Bridge | 2. Self inductance |
| c. Schering Bridge | 3. Frequency |
| d. Maxwell's Bridge | 4. Low resistance |
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Q152
Open questionWhich one of the following detectors is generally used in ac bridges for audio frequency range?
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Q153
Open questionWhile using Maxwell bridge, the Q factor of a coil is obtained as
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Q154
Open questionThe most fundamental method of frequency measurement is
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Q155
Open questionIn the circuit shown in the figure, if the voltmeter and the ammeter are interchanged, it likely to result in damage to
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Q156
Open questionThe pressure and velocity at the throat of a Venturi tube, measuring the flow of a liquid, are related to the upstream pressure and velocity, respectively, as follows:
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Q157
Open questionThe full-scale deflecting torque of a 20 A moving-iron ammeter is 6 × 10-5 N-m. What is the rate of change of self-inductance with respect to the deflection of the pointer of the ammeter at full scale?
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Q158
Open questionWhich of the following statements is true about two wattmeter method for power measurement in three phase current?
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Q159
Open questionTo detect the small output voltage of LVDT which DVM is preferable.
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Q160
Open questionIn a digital voltmeter, input signal is integrated for a duration of 50 clock cycles. To eliminate the effect of 100 Hz noise present in the signal, what is the maximum clock frequency?
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