Related Questions

The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures
A Active power in R phase
B Active power of Y phase
C Reactive power of R phase
D Power proportional to 3 phase power if the load is balanced
A dynamometer wattmeter can be used for
A Only Direct Current
B Only Active Current
C Both A & B
D None of the above
কোনটির ক্ষেত্রে Two wattmeter method প্রযোজ্য-
A শুধুমাত্র balanced 3- ϕ সিস্টেমে
B শুধুমাত্র unbalanced 3- ϕ সিস্টেমে
C Balanced ও Unbalanced 3- ϕ সিস্টেমে
D শুধুমাত্র Y- সিস্টেম
The pressure coil of a wattmeter should be connected on the supply side of the current coil when
A Load impedance is high
B Load impedance is low
C Supply voltage is low
D None of the above
Wattmeter cannot be designed on the principle of
A electrostatic instrument
B thermocouple instrument
C moving iron instrument
D electrodynamic instrument
The resistance in the circuit of the moving coil of a dynamometer wattmeter should be
A almost zero
B low
C high
D none of the above
In a low power factor wattmeter the compensating coil is connected
A in series with current coil
B in parallel with current coil
C in series with pressure coil
D in parallel with pressure coil
In a low power factor wattmeter the pressure coil is connected
A to the supply side of the current coil
B to the load side of the current coil
C in any of the two meters at connection
D none of the above
A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
A Slop speed operation
B High starting torque
C Low windage losses
D All of the above
The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type
A Star connected only
B Delta connected only
C Both (A) and (B)
D None of the above

Next steps