The switch board instruments
1). Should be mounted in vertical position
2). Should be mounted in horizontal position
3). Either (1) or (2)
4). Neither (1) nor (2)
The power factor of a single-phase load can be calculated if the instruments available are
1). one voltmeter and one ammeter
2). one voltmeter, one ammeter and one wattmeter
3). one voltmeter, one ammeter and one energy meter
4). any of the above
Two voltmeters have the same range 0-400 V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600 V be applied across them, the readings are
1). 360 V and 240 V
2). 300 V each
3). 400 V and 200 V
4). one of the meters out of the range and other 100 V
The percentage limiting error, in the case of an instrument reading of 8.3 V with a 0 to 150 V voltmeter having a guaranteed accuracy of 1% full-scale reading is
1). 1.810%
2). 0.181%
3). 0.0018%
4). 18.10%
In a Weston synchroscope, the fixed coils are connected across
1). bus-bars
2). incoming alternator
3). a lamp
4). none of the above