Commonly used standard capacitor is Spherical type Electrostatic type Multiplate parallel plate type Concentric cylindrical type TRUE ANSWER : ? YOUR ANSWER : ?
A resistance of 105 ohms is specified using significant figures as indicated below : 1. 105 ohms 2. 105.0 ohms 3. 0.000105 mega ohms Among these, 2 represents greater precision but 1 and 3 represent same precision. 1, 2 and 3 represent same precision. 1 represents greater precision than 2 and 3. 2 and 3 represent greater precision than 1. TRUE ANSWER : ? YOUR ANSWER : ?
Which of following statement are correct in case of power factor meter? The restoring torque is provided by a controlling torque. It consist of two coils mounted at right angles to each other. Both B and C. The deflection is proportional to phase angle between field coil and crossed coil. TRUE ANSWER : ? YOUR ANSWER : ?
A PMMC voltmeter is connected across a series combination of a DC voltage source V1 = 2 V and an AC voltage source V2 = 3sin4t, the voltmeters reads 5 V. 2 V. (2 + √3/2)V. 0 V. TRUE ANSWER : ? YOUR ANSWER : ?
A DC potentiometer is the best means available for the measurement of DC voltage because None of above. The precision in measurment is independent of the type of the defector used. It is possible to standardize before a measurement is undertaken. It is based on null balance technique. TRUE ANSWER : ? YOUR ANSWER : ?
What is the approximate input impedance of a CRO? 1 MΩ 10 MΩ 0 100 MΩ TRUE ANSWER : ? YOUR ANSWER : ?
Kelvin’s double bridge is used to measure low resistance because there is no thermo electric emf. it has high sensitivity. effect of contact and lead resistance is eliminated. resistance variation due to temperature. TRUE ANSWER : ? YOUR ANSWER : ?
A wheatstone bridge cannot be used for precision measurements because errors are introduced into on account of Thermoelectric emfs. Resistance of connecting leads. All of above. Contact resistance. TRUE ANSWER : ? YOUR ANSWER : ?
To measure ac as well as dc power, we use Induction wattmeter None of the listed here Sometimes induction and sometimes dynamometer wattmeter Dynamometer wattmeter TRUE ANSWER : ? YOUR ANSWER : ?
A meter has a full-scale deflection of 90o at a current of 1 A. The response of the meter is square law. Assuming spring control, the current for a deflection at 45o will be 0.67 A. 0.25 A. 0.50 A. 0.70 A. TRUE ANSWER : ? YOUR ANSWER : ?