50) A circuit has an impedance of 22 ohms and drawing a current of 10 amperes at 0.8 power factor lagging. Which one of the following will be the apparent power?

51) When two wattmeters are used to measure power of a 3 phase balanced circuit and one wattmeter reads negative, it means the angle of lag is

52) The purpose of a backup fuse is to provide protection against

53) In a moving coil instrument, the damping torques is developed by

54) Which instrument is used for measuring the medium resistance directly?