A. electrostatic coupling
B. electromagnetic coupling
C. both A. and B.
D. none of the above
Related Mcqs:
- Systematic errors are_________________?
A. instrumental errors
B. environmental errors
C. observational errors
D. all of the above - 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 - The gravity controlled instrument has crowded scale because current is proportional to________________?
A. balancing weight
B. deflection angle
C. sine of deflection angle - 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 - 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 - 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 - 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 - 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 - 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 - Commonly used standard capacitor is______________?
A. spherical type
B. concentric cylindrical type
C. electrostatic type
D. multilayer parallel plate type
