০০। A 0-150 voltmeter has a guaranteed accuracy of 1% of full scale reading. If actual reading is 83 V, the percentage error is
ক) 0.83%
খ) 1%
গ) 1.81%
ঘ) none of the above
০১। A 0-200 V voltmeter has a sensitivity of 1 kΩ per volt. The resistance of voltmeter is
ক) 1 kΩ
খ) 200 kΩ
গ) 100 kΩ
ঘ) 50 kΩ
০২। A 0-200 V voltmeter has an accuracy of 0.75% of full scale reading. If voltage measured is 100 V, the error is
ক) 3%
খ) 2%
গ) 1.5%
ঘ) .75%
০৩। A 1 mA meter is to be converted to 1 A ammeter. The meter resistance is 100 Ω. The value of shunt resistance is
ক) 0.001 Ω
খ) 0.1001 Ω
গ) 100 Ω
ঘ) 1000 Ω
০৪। A 24 mm long conductor has a resistance of 128 Ω. The change in resistance is 13.3 Ω and change in length is 1.6 mm under tension. The gauge factor is
ক) 1.2
খ) 1.6
গ) 2.1
ঘ) 2.6
০৫। A 3-digit voltmeter having a resolution of 100 mV can be used to measure a maximum of
ক) 100 V
খ) 200 V
গ) 1000 V
ঘ) 5000 V
০৬। A 300 V voltmeter has an accuracy of ± 2% of full scale deflection. When the reading is 222 V, the actual voltage
ক) lies between 217.56 and 226.44 V
খ) lies between 217.4 and 226.6 V
গ) lies between 216 and 228 V
ঘ) is exact 222 V
০৭। A capacitance transducer can be used to measure
ক) thickness of sheet
খ) displacement
গ) level of fluids
ঘ) all of the above
০৮। A capacitance transducer has two plates each of area 5 mm2. The coil gap is 2 mm. Displacement sensitivity due to change in gap length is
ক) 11.1 pF/cm
খ) 44.2 pF/cm
গ) 52.3 pF/cm
ঘ) 66.3 pF/cm
০৯। A coil resonates at 1 MHz with a resonating capacitance of 72 pF. At 500 pF, resonance is obtained with a resonating capacitor of 360 pF. The self capacitance of coil is
ক) 12 pF
খ) 24 pF
গ) 30 pF
ঘ) 72 pF
১০। A CT is used to feed current coils of wattmeter, energy meter, power factor meter and an ammeter. Then
ক) all the coils are in series
খ) all coils are in parallel
গ) the coils are in series-parallel
ঘ) either (a) or (b)
১১। A current of 3.18 A is flowing through resistance of 35.68 Ω. The voltage drop across resistance to the appropriate number of significant figures is
ক) 113.4624 V
খ) 113.462 V
গ) 113.46 V
ঘ) 113 V
১২। A current of 3.25 A is flowing through a resistance of 34.98 Ω. The voltage drop across resistance to the appropriate number of significant figures is
ক) 113.685 V
খ) 113.68 V
গ) 113.6 V
ঘ) 114 V
১৩। A D' Arsonval galvanometer is a
ক) moving coil instrument
খ) moving iron instrument
গ) dynamometer instrument
ঘ) induction instrument
১৪। A data signal having frequency components from dc to 50 Hz is to be sent through pulse code modulation using an 8 digit code. The minimum carrier channel bandwidth is
ক) 1 kHz
খ) 2 kHz
গ) 4 kHz
ঘ) 8 kHz
১৫। A digital frequency counter can be converted to DVM by addition of a suitable
ক) voltage controlled oscillator
খ) D/A converter
গ) power amplifier
ঘ) operational amplifier
১৬। A digital voltmeter can count from 0 to 9999. If full scale reading is 9.999 V, the resolution of full scale reading is
ক) 0.001
খ) 1000
গ) 2 digit
ঘ) 1 mV
১৭। A digital voltmeter has a 4 1/2 digit display. The 1 V range can measure voltage up to
ক) 0.9999 V
খ) 1.9999 V
গ) 0.199 V
ঘ) 9.999 V
১৮। A digital voltmeter has a read out range from 0 to 999 counts. If the full scale reading is 9.999 V, the resolution is
ক) 1 V
খ) 0.01 V
গ) 1 mV
ঘ) 1 μV
১৯। A diode peak reading VTVM and thermocouple meter are connected across output of an amplitude modulated circuit. In the absence of modulation both meters read 10 V. When sinusoidal AM is applied, VTVM reads 15V The reading of thermocouple meter will be