In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be_______________?

Related Mcqs:

A moving-coil permanent-magnet instrument can be used as ____________by using a low resistance shunt?

A. ammeter B. voltmeter C. flux-meter D. ballistic galvanometer...

The chemical effect of current is used in ______________?

A. D.C. ammeter hour meter B. D.C. ammeter C. D.C. energy meter D. none of the above...

In order to achieve high accuracy, the slide wire of a potentiometer should be_______________?

A. as long as possible B. as short as possible C. neither too small not too large D. very thick...

A Weston synchronoscope is a________________?

A. moving coil instrument B. moving iron instrument C. dynamometer instrument D. none 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...