In a moving coil instrument, the deflecting torque is proportional to Squareroot of the current Sine of the measurand Current Square of the current TRUE ANSWER : ? YOUR ANSWER : ?
A dynamometer wattmeter can be used for Both DC and AC Any of the listed here DC only AC only TRUE ANSWER : ? YOUR ANSWER : ?
An oscilloscope indicates DC value of voltage RMS value Average value Peak to peak value of voltage TRUE ANSWER : ? YOUR ANSWER : ?
The repeat accuracy of an instrument can be judged from its Dynamic error Standard deviation of error Static error Linearity error TRUE ANSWER : ? YOUR ANSWER : ?
An electric pyrometer is an instrument used to measure Phase Frequency None of the listed here High temperatures TRUE ANSWER : ? YOUR ANSWER : ?
A DC A-h meter is rated for 15 A, 250 V. The meter constant is 14.4 A-sec/rev. The meter constant at rated voltage may be expressed as 3750 rev/KWh. 1000 rev/KWh. 960 rev/KWh. 3600 rev/KWh. TRUE ANSWER : ? YOUR ANSWER : ?
Electrostatic instruments are normally used for Low voltage measurements High current measurements Low current measurements High voltage measurements TRUE ANSWER : ? YOUR ANSWER : ?
A sampling wattmeter is used to measure the average power of a load. The peak to peak voltage of a square wave is 10 V and the current is triangular wave of 5 Amp P-P as shown in the figure. The period is 20 ms. The reading in W will be 100 W. 25 W. 0 W. 50 W. TRUE ANSWER : ? YOUR ANSWER : ?
A resistance is measured by the voltmeter-ammeter method employing dc excitation and a voltmeter of very high resistance connected directly across the unknown resistance. If the voltmeter and ammeter reading are subject to maximum possible errors of ± 2.4 % and ± 1.0 % respectively, then the magnitude of the maximum possible percentage error in the value of resistance deduced from the measurement is nearly ± 1% ± 1.4% ± 2.4% ± 3.4% TRUE ANSWER : ? YOUR ANSWER : ?
A current of is measured with a thermocouple, 5 A full scale meter. What is the meter reading? 6.09 A. 4.06 A. 5 A. 2.03 A. TRUE ANSWER : ? YOUR ANSWER : ?