# A star circuit has element of resistance R/2. The equivalent delta elements will be?

27 views

A star circuit has element of resistance R/2. The equivalent delta elements will be?

## Related questions

When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will?

A star arrangement of resistances has branch resistance of 3 Ω. The equivalent delta arrangement will have resistance of values (1) 9 Ω (2) 6 Ω (3) 3 Ω (4) 1 Ω

If an unsymmetrical line to ground fault occurs at the secondary terminals of a delta/star, ungrounded transformer, then  (A) zero sequence currents are present on both sides of the transformer  (B) zero sequence currents are absent on both sides of the transformer  (C) zero sequence currents are present on the secondary side but not on the primary side  (D) zero sequence currents are present on the primary side but not on the secondary side

If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be?

The resistance of a few meters of wire conductor in closed electrical circuit is?

The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as

Compare star and Delta Connection.

What is difference between Star and Delta Connection?

What is the equivalent resistance of one limb A when delta connection is transformed in to star?  (A) R1R3/R1+R2+R3 (B) R2R3/R1+R2+R3 (C) R1R2R3/R1+R2+R3 (D) R1+R2+R3

Which of the following are known as the short circuit parameters of a 2- port network? (A) Z- parameters. (B) H- parameters. (C) Y- parameters. (D) A,B,C,D, parameters.

A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage regulation at 0.8 pf lagging would he

For maximum transfer of power, internal resistance of the source should be?

A series R-L-C Circuit has a resonant frequency of 1000 Hz. If the values of R, L and C are doubled, the new resonant frequency is

A high-pass filter has a resistance R = 2 kΩ The lowest input frequency to be passed is 7.5 kHz. The value of suitable coupling capacitor must be: A) 0.001 pico Farad B) 0.01 pico Farad C) 0.1 pico Farad D) 1 pico Farad

In an ac series RLC circuit, the voltage across R and L is 20 V; voltage across L and C is 9 V and voltage across RLC is 15 V. What is the voltage across C?

A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive load. If input dc voltage is 100 V, then the peak to peak output line voltage is :

Draw the phasor diagram for Star connected balanced system.

Write the relation between phase and line current, phase and line voltage for Star connection.

Three identical resistors connected in star consume 5000 W. If the resistors are connected in delta across the same supply, the power consumed will be

In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will?

In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will?

Ratio of the rotor reactance X to the rotor resistance R for a two-phase servo motor (A) is equal to that of a normal induction motor (B) is less than that of a normal induction motor (C) is greater than that of a normal induction motor (D) may be less or greater than that of a normal induction motor

If each branch of a Delta circuit has impedance √3 Z, then each branch of the equivalent Y circuit has impedance:  (A) Z/√3 (B) 3Z (C) 3√3Z (D) Z/3

In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of?

A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is (A) 300 W (B) 150 W (C) 45 W (D) 20 W

An electrical circuit with 10 branches and 7 junctions will have

A PMMC instrument has FSD of 100 μA and a coil resistance of 1 kΩ. To convert the instrument into an ammeter with full scale deflection of 100 mA, the required shunt resistance is (A) 1 Ω (B) 1.001 Ω (C) 0.5 Ω (D) 10 Ω

If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes?

A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ohm. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Three resistances of 3 Ω each are connected in delta. The value of the resistances in the equivalent star is : (A) 27 (B) 9 (C) 1.5 (D) 1 Ω

The time constant of a series R-C circuit is given by?

When The dc converter in figure shown has a resistance load of R = 10 Ω and the input voltage is Vs 220 V the converter switch remains on, its voltage drop is Vo -2 V. The chopping frequency is fI K sW Vs If the duty cycle is 50%, determine: (a) the average output voltage V (b) the RMS output voltage Vo (c) the converter efficiency (d) the effective input resistance of the converter

If the % reactance upto the fault point is 20%, then the short circuit current will be

In parallel RLC resonance circuit at resonance the current will be  (1) Minimum (2) Maximum (3) Zero (4) Infinite

A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up to 300 V, the external resistance to be connected in series with the instrument is (A) 9997 Ω (B) 10000 Ω (C) 997 Ω (D) 10003 Ω

A closed switch has a resistance of?

Problem on temperature coefficient of resistance 2

In a transformer the resistance between its primary and secondary should be?

In a series R-C circuit, with the increase in frequency, current (A) Reduces (B) Increases (C) Does not change (D) Becomes zero

What is the RMS voltage in a series RL circuit, if the voltage across R and L is 256 V and 192 V respectively? A) 320 V B) 448 V C) 64 V D) None of these

In a loss-free R-L-C circuit the transient current is?

In a pure resistive circuit, the average power Pavg is ______ the peak power Pmax. (1) Double (2) One-half of (3) One-fourth (4) Equal to

A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC voltage drops entirely across the

In a series RLC high Q circuit, the current peaks at a frequency  (1) equal to the resonant frequency (2) greater than the resonant frequency (3) less than the resonant frequency (4) equal to half the resonant frequency

If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be?

Thevenin resistance Rth is found?