Wagner earthing device is used to eliminate errors due to________________?

Related Mcqs:

1. Systematic errors are_________________?

   A. instrumental errors B. environmental errors C. observational errors D. all of the above...

2. In an energy meter braking torque is produced to________________?

   A. safe guard it against creep B. brake the instrument C. bring energy meter to stand still D. maintain steady speed and equal to driving torque...

3. The gravity controlled instrument has crowded scale because current is proportional to________________?

   A. balancing weight B. deflection angle C. sine of deflection angle...

4. The spring material used in a spring control device should have the following property?

   A. Should be non-magnetic B. Most be of low temperature co-efficient C. Should have low specific resistance D. Should not be subjected to fatigue E. All of the above...

5. A __________ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly___________?

   A. deflecting B. controlling C. damping D. any of the above...

6. It is required to measure the true open circuit e.m.f. of a battery. The best device is_____________?

   A. D.C. voltmeter B. Ammeter and a known resistance C. D.C. potentiometer D. None of the above...

7. Basically a potentiometer is a device for________________?

   A. comparing two voltages B. measuring a current C. comparing two currents D. measuring a voltage E. none of the above...

8. In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was___________?

   A. unity B. 0.8 lagging C. 0.8 leading D. zero...

9. For measurement of inductance having high value, we should use______________?

   A. Maxwell’s bridge B. Maxwell Wein bridge C. Hay’s bridge D. Any of the above...

10. Commonly used standard capacitor is______________?

    A. spherical type B. concentric cylindrical type C. electrostatic type D. multilayer parallel plate type...