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- A three-phase synchronous motor has a terminal voltage of 460 V and a terminal current of 120 A at a power factor of 0.95 lagging, synchronous reactance of 1.68 ohm and the field current is 47 A. The field to armature mutual inductance of the synchronous motor is _____________.
- In a synchronous motor, the armature current has large values for?
- When a conductor carries more current on the surface as compared to core, it is due to?
- Which of the following quantity maintains the same direction whether a D.C. machine runs as a generator or as a motor a. Induced e.m.f. b. Armature Current c. Field Current d. Supply Current
- A 50 kW dc shunt is loaded to draw rated armature current at any given speed. When driven
- A field excitation of 20 A in a certain alternator results in an armature current of 400 A in short circuit and a
- The supply both to field and armature circuits are disconnected simultaneously in a separately excited dc...
- The fomula to find I when the values of V and R are know is?
- A 220 V dc machine has an armature resistance o f 1-ohm. If the full load current is 20A, the difference...
- At low values of slip, the torque of an induction motor is
- AC supply system compared to DC supply system has the advantage:
- In an AC. circuit, a low value of kVAR compared with kW indicates?
- parallel operation of mosfet can be done more easily as compared to thyristor. why?
- A synchronous generator and motor are rated 30MVA, 13.2 kV, and both have subtransient reactances of 20%. The line connecting them has a reactance of 10% on the base of the machine ratings. The motor is drawing 20MW at 0.8 power-factor leading and a terminal voltage of 12.8 kV when a symmetrical 3-phase fault occurs at the motor terminals. Use superposition concepts to find the fault current in amperes
- why is it that when the frequency of a voltage in an inductor increases current decreases?
- When running under no-load condition and with over excitation, armature current Ia drawn by a synchronous motor
- A 220 V shunt motor develops a torque of 54 N-m at armature current of 10 A. The torque produced when...
- A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave?
- The formula to find I when the values of V and R are known is?
- What is the best data type definition for Oracle when a field is alphanumeric and has a length that can vary?
- The values of L and C for a low pass filter with cut off frequency of 2.5 KHz and operating with a terminated
- Which one of the following logic circuit has the highest speed as compared to the currently available logic
- As compared to a split phase motor, a capacitor start motor has _____.
- A null type of instrument as compared to a deflecting type instrument has
- As compared to power MOSFET, a BJT has
- DRAM has the characteristics compared to...
- Compared to MOSFET operational amplifier, BJT operational amplifier has...
- As compared to shunt and compound motors, series motor has the highest torque...
- A.C. series motor as compared to D.C. series motor has?
- A synchronous motor has better power factor as compared to that of an equivalent induction motor...
- H.R.C. fuse, as compared to a rewirable fuse, has?
- A dc voltmeter has a sensitivity of 1000 Ohm/V. When it measures half full scale in 100 V range, the current ...
- With the help of neat diagrams,explain the following methods of speed control in DC series motor. i) Field diverter method. ii) Armature diverter method.
- If shunt generator delivers 100 A at 200 V, and the resistance of the shunt field and armature are...
- A DC shunt generator supplies 450 A at 230 V. The resistances of shunt field and armature are 50 Ω and ...
- An 8 pole lap wound DC shunt generator is supplying 295A to a load. The field current of the generator is 5A....
- What is the charge on each capacitor when a 150 V is applied across two capacitors with values 5 μF and 10 μF,
- When three resistors with unequal values are connected in parallel, _______
- Why does the magnetic field flow from north to south?
- A series R-L-C Circuit has a resonant frequency of 1000 Hz. If the values of R, L and C are
- Why INDIA has 50hz and USA has 60hz frequency cycle of current?
- When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially...
- When a D.C. series motor is connected to A.C. supply, the power factor will be low because of?
- Two 3-phase, Y-connected alternators are to be paralleled to a set of common busbars. The armature has a
- Why transformer have high and low voltage windings
- Why in electric motor or generator heating due to current involves dissipation of electrical energy?
- Explain why potential difference is necessary to produce current in a circuit.
- As we say definition of current is flow of charges then why we give the direction of current from +ve to -ve????
- When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle
- If the current in the armature of do series motor is reduced to 5%, the torque of the motor will become:

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