71. A voltmeter having a sensitivity of 1000 Ω/V reads 100 V on its 150 V scale when connected across at resistor of unidentified specifications in series with a milliammeter. When the milliammeter reads 5 mA, the error due to the loading effect of the voltmeter will be nearly
72. A digital displacement indicator based on a linear voltage differential transformer (LVDT) transducer and A/D conversion used a LVDT with a sensitivity of 1 mV/mm. If the smallest displacement to be measured is 0.1 mm and the maximum displacement of the LVDT core is 10 cm, then the digital display required for the instrument has to be
73. The study of energy distribution across the frequency spectrum of a given electrical signal is done by a
74. The function of the dummy strain gauge, in measurement using two strain gauge, is to
75. Harmonic distortion analyzer
76. The value of n for the n-bit A/D converter required to convert an analog input in the range of 0 to 5 volts to an accuracy of 10 mV is:
77. For the recording of very fast random signals, the most suitable instrument would be
78. The sensitivity of a potentiometer can be increased by
79. Consider the following types of digital voltmeters:
1. Ramp type
2. Dual slope integrating type
3. Integrating type using voltage to frequency conversion
4. Successive approximation type
5. Servo balanced potentiometer type
Which of these require a fixed reference voltage at the comparator stage?
1. Ramp type
2. Dual slope integrating type
3. Integrating type using voltage to frequency conversion
4. Successive approximation type
5. Servo balanced potentiometer type
Which of these require a fixed reference voltage at the comparator stage?
80. Q factor of Quartz . . . . . . . .
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