Three resistances of 3 Ω each are connected in delta. The value of the resistances in the equivalent star 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

by
by
D

1 Answer

Answer :

9
by

Related questions

If two resistances of 10 Ω and 10 Ω are connected in parallel the equivalent resistance is _________.

Last Answer : If two resistances of 10 Ω and 10 Ω are connected in parallel the equivalent resistance is 5 Ω.

Three resistances 20 Ω, 30 Ω and 60 Ω are connected in parallel, their combined resistance is given by A. 110 Ω B. 50 Ω C. 20 Ω D. 10 Ω

Description : Three resistances 20 Ω, 30 Ω and 60 Ω are connected in parallel, their combined resistance is given by A. 110 Ω B. 50 Ω C. 20 Ω D. 10 Ω

Last Answer : 10 Ω

If P is the power of a star connected system then what will be power of an equivalent delta connected system? A..P B. 3P C. P/3 D. None of the above

Description : If P is the power of a star connected system then what will be power of an equivalent delta connected system? A..P B. 3P C. P/3 D. None of the above

Last Answer : Ans: A

A transmission line of unknown impedance is terminated with two different resistances, and an SWR is measured each time. With a 75 Ω termination, the SWR measures 1.5. With a 300 Ω termination, it measures 2.67. What is the impedance of the line? A. 100 Ω B. 212 Ω C. 300 Ω D. 112 Ω

Description : A transmission line of unknown impedance is terminated with two different resistances, and an SWR is measured each time. With a 75 Ω termination, the SWR measures 1.5. With a 300 Ω termination, it measures 2.67. What is the impedance of the line? A. 100 Ω B. 212 Ω C. 300 Ω D. 112 Ω

Last Answer : D. 112 Ω

When n resistances each of value r are connected in parallel, then ...

Description : When n resistances each of value r are connected in parallel, then resultant resistance is x. When these n resistances are connected in series, total resistance is

Last Answer : When n resistances each of value r are connected in parallel, then resultant resistance is x. When these n resistances are connected in series, total resistance is n2 x.

A three-phase transformer, connected in star-delta, is composed of three single-phase transformers, each

Description : A three-phase transformer, connected in star-delta, is composed of three single-phase transformers, each rated 127/ 13.2 kV. The line-to-line voltage ratio for the three-phase transformer is: A) 220 / 13.2 kV B) 127 / 13.2 kV C) 127 / 220 kV D) 220 / 220 kV

Last Answer : A three-phase transformer, connected in star-delta, is composed of three single-phase transformers, each rated 127/ 13.2 kV. The line-to-line voltage ratio for the three-phase transformer is: 220 / 13.2 kV 

A supply of 24 V DC is applied across a circuit which consist of three resistors connected in parallel R1= 1.2KΩ, R2= 560 Ω, R3= 2.1Ω and a fourth resistor of 7.8 Ω connected in series with the parallel group. Determine the current, voltage and power across each resistor

Last Answer : Req= (1/1200 +1/560 + 1/2.1)^-1        = 2.1 ohms RT= 2.1 + 7.8      = 9.9 ohms IT = V/R = 24/9.9                = 2.4 A Veq= R I =  2.1 2 ... 7.8         = 12.096 w                 = 44.928 w _________________________________________ By: Ellis-Junior Kamatjipose [email protected]

Calculate the equivalent resistance between A & B using star-delta conversion

Description : Calculate the equivalent resistance between A & B using star-delta conversion

Last Answer : Solution :  Converting Inner star in to delta-  Resistances 4 and 6 are in parallel in all branch so

A receiver connected to an antenna whose resistance is 50 Ω has an equivalent noise resistance of 30Ω. Calculate its equivalent noise temperature if the noise figure is equal to 1.6. A. 17.4 K B. 174K C. 1.74K D. 17K

Description : A receiver connected to an antenna whose resistance is 50 Ω has an equivalent noise resistance of 30Ω. Calculate its equivalent noise temperature if the noise figure is equal to 1.6. A. 17.4 K B. 174K C. 1.74K D. 17K

Last Answer : B. 174K

Two 10 Ω resistors are connected in parallel, their equivalent resistance is A. 5 ΩB. 0.2 ΩC. 15 ΩD. 20 Ω

Description : Two 10 Ω resistors are connected in parallel, their equivalent resistance isA. 5 Ω B. 0.2 Ω C. 15 Ω D. 20 Ω

Last Answer :  5 Ω

In a three phase transformer, if the primary side is connected in star and secondary side is connected in delta, what is the angle difference between phase voltage in the two cases. (A) delta side lags by -30°. (B) star side lags by -30°. (C) delta side leads by 30°. (D) star side leads by -30°.

Description : In a three phase transformer, if the primary side is connected in star and secondary side is connected in delta, what is the angle difference between phase voltage in the two cases. (A) delta side lags by -30°. (B) star side lags by -30°. (C) delta side leads by 30°. (D) star side leads by -30°.

Last Answer : Ans: C This is vector group and has +30° displacement. Therefore, delta side leads by +30°.

Given three resistances of `30 Omega` each. How can they be connected to given a total resistance of (i) `90 Omega (ii) 10 Omega (iii) 45 Omega` ?

Description : Given three resistances of `30 Omega` each. How can they be connected to given a total resistance of (i) `90 Omega (ii) 10 Omega (iii) 45 Omega` ?

Last Answer : Given three resistances of `30 Omega` each. How can they be connected to given a total resistance of (i) `90 Omega (ii) 10 Omega (iii) 45 Omega` ?

With three resistances connected in parallel, if each dissipates 20 W the ...

Description :  With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals?

Last Answer : Power is the only thing which is additive in both connection whether it is parallel or series connection so total power consumed will addition of all individual power =20+20+20 = 60 watt

What is the total resistance if 5 resistors of 20 Ω each are connected in series?

Description : What is the total resistance if 5 resistors of 20 Ω each are connected in series? A) 100 Ω B) 4 Ω C) 20 Ω D) None of these

Last Answer : What is the total resistance if 5 resistors of 20 Ω each are connected in series? A) 100 Ω B) 4 Ω C) 20 Ω D) None of these

Three resistors of 4 Ω, 6 Ω and 9 Ω are connected in parallel. Which resistor consumes the maximum power?

Description : Three resistors of 4 Ω, 6 Ω and 9 Ω are connected in parallel. Which resistor consumes the maximum power?  (A) 4 Ω (B) 6 Ω (C) 9 Ω (D) 17 Ω

Last Answer : (c) 9 ohm

Convert the delta network into equivalent star network.

Description : Convert the delta network into equivalent star network.

Last Answer : Delta to start network R1 = 4x6/ 4+6+2 = 24/12 =2/1= 2Ω R2 = 2x6/ 4+6+2 = 12/12= 1 = 1Ω R3 = 4x 2/ 4+6+2 = 8/12= 2/3= 0.66Ω

Is the alternator connected star or delta

Description : Is the alternator connected star or delta

Last Answer : Look up in Dennis T Hall. Also in your ship ask E/O. Normally star.

A 4000 kVA, 11 kV/132 kV delta-star connected 3-phase transformer has reactance, x1 = 0.12 p.u.

Description : A 4000 kVA, 11 kV/132 kV delta-star connected 3-phase transformer has reactance, x1 = 0.12 p.u. The actual value of x1 referred to the low voltage side is (A) 0.85 Ω (B) 3.63 Ω (C) 36.3 Ω (D) 252 Ω

Last Answer : A 4000 kVA, 11 kV/132 kV delta-star connected 3-phase transformer has reactance, x1 = 0.12 p.u. The actual value of x1 referred to the low voltage side is 3.63 Ω

When four resistances of 2W 1W; 5W 2W; 10W 5W and 15W 10 W are connected in parallel,

Description : When four resistances of 2W 1W; 5W 2W; 10W 5W and 15W 10 W are connected in parallel, the greatest power is absorbed by • 2 W, 1 W • 5 W, 2 W • 10 W, 5W • 15 W, 10 W

Last Answer : When four resistances of 2W 1W; 5W 2W; 10W 5W and 15W 10 W are connected in parallel, the greatest power is absorbed by 2 W, 1 W

Two cells connected in series have electromotive force of 1.5 V each. Their internal resistances are `0.5 Omega` and `0.25 Omega` respectively. This c

Description : Two cells connected in series have electromotive force of 1.5 V each. Their internal resistances are `0.5 Omega` and `0.25 Omega` respectively. This c

Last Answer : Two cells connected in series have electromotive force of 1.5 V each. Their internal ... potential differnce across the terminals of each cell.

Three resistances `2 Omega, 3 Omega` and `4 Omega` are connected in parallel. The ratio of currents passing through them when a potential difference i

Description : Three resistances `2 Omega, 3 Omega` and `4 Omega` are connected in parallel. The ratio of currents passing through them when a potential difference i

Last Answer : Three resistances `2 Omega, 3 Omega` and `4 Omega` are connected in parallel. The ratio of currents passing through them ... ` C. `4:3:2` D. `6:4:3`

If an inductance is connected in one arm of bridge and resistances in the remaining three arms?

Last Answer : If an inductance is connected in one arm of bridge and resistances in the remaining three arms the bridge cannot be balanced.

Average power dissipated in resistor if sinusoidal p.d of peak value 25 V is connected across a 20 Ω resistor isA. 15.6 WB. 15 WC. 16 WD. 17 W

Description : Average power dissipated in resistor if sinusoidal p.d of peak value 25 V is connected across a 20 Ω resistor is A. 15.6 W B. 15 W C. 16 W D. 17 W

Last Answer : 15.6 W

Consider a circuit with four 10 Ω resistors connected in parallel and the current flowing through the circuit is

Description : Consider a circuit with four 10 Ω resistors connected in parallel and the current flowing through the circuit is 5 A. What will be the current if the above 4 resistors are connected in parallel? A) 5 A B) 50 A C) 500 A D) None of these

Last Answer : Consider a circuit with four 10 Ω resistors connected in parallel and the current flowing through the circuit is 5 A. What will be the current if the above 4 resistors are connected in parallel? A) 5 A B) 50 A C) 500 A D) None of these

Three equal impedances are first connected in delta across a 3 -phase balanced supply. If the same...

Description : Three equal impedances are first connected in delta across a 3 -phase balanced supply. If the same impedances are connected in star across the same supply then,

Last Answer : A

What is the total resistance of the circuit shown in figure 3- 59? (Hint: Redraw the circuit to simplify and then use equivalent resistances to compute for RT.)

Description : What is the total resistance of the circuit shown in figure 3- 59? (Hint: Redraw the circuit to simplify and then use equivalent resistances to compute for RT.)

Last Answer : 4Ω

Two cells of emf of 1.5 V and 2.0 V having internal resistances of `1 Omega` and `2 Omega`, respectively are connected in parallel so as to send curre

Description : Two cells of emf of 1.5 V and 2.0 V having internal resistances of `1 Omega` and `2 Omega`, respectively are connected in parallel so as to send curre

Last Answer : Two cells of emf of 1.5 V and 2.0 V having internal resistances of `1 Omega` and `2 Omega` ... of `5 Omega`. Find the current in the external circuit.

How can the resistances of `2Omega, 3 Omega " and " 6 Omega` be connected to give an effective resistance of `4 Omega` ?

Description : How can the resistances of `2Omega, 3 Omega " and " 6 Omega` be connected to give an effective resistance of `4 Omega` ?

Last Answer : How can the resistances of `2Omega, 3 Omega " and " 6 Omega` be connected to give an effective resistance of `4 Omega` ?

Two resistors of resistances `2Omega` and `6Omega` are connected in parallel. This combination is then connected to a battery of emf 2 V and internal

Description : Two resistors of resistances `2Omega` and `6Omega` are connected in parallel. This combination is then connected to a battery of emf 2 V and internal

Last Answer : Two resistors of resistances `2Omega` and `6Omega` are connected in parallel. This combination is then connected to a ... . `(4)/(17)A` D. `1 A`

Two batteries of emf `epsilon_(1)` and `epsilon_(2) (epsilon_(2)gtepsilon_(1)` and internal resistances `r_(1)` and `r_(2)` respectively are connected

Description : Two batteries of emf `epsilon_(1)` and `epsilon_(2) (epsilon_(2)gtepsilon_(1)` and internal resistances `r_(1)` and `r_(2)` respectively are connected

Last Answer : Two batteries of emf `epsilon_(1)` and `epsilon_(2) (epsilon_(2)gtepsilon_(1)` and internal resistances ... internal resistances `r_(1)` and `r_(2)`

Two resistances are connected in the two gaps of a meter bridge. The balance point is `20 cm` from the zero end. When a resistance `15 Omega` is conne

Description : Two resistances are connected in the two gaps of a meter bridge. The balance point is `20 cm` from the zero end. When a resistance `15 Omega` is conne

Last Answer : Two resistances are connected in the two gaps of a meter bridge. The balance point is `20 cm` from the zero end. ... the value. A. 3 B. 6 C. 9 D. 12

Four resistances are connected in a circuit in the given figure. The electric cirrent flowing through `4 ohm` and `6 ohm` resistance is respectively

Description : Four resistances are connected in a circuit in the given figure. The electric cirrent flowing through `4 ohm` and `6 ohm` resistance is respectively

Last Answer : Four resistances are connected in a circuit in the given figure. The electric cirrent flowing through `4 ohm` and `6 ... 1 A and 1 A D. 2 A and 2 A

If electric resistance is to be decreased, then the number of resistances should be connected in – (1) Series (2) Parallel (3) Mixed arrangement (4) None of these

Description : If electric resistance is to be decreased, then the number of resistances should be connected in – (1) Series (2) Parallel (3) Mixed arrangement (4) None of these

Last Answer : (2) Parallel Explanation: Resistors are in parallel when each resistor is connected directly to the voltage source by connecting wires having riegligible resistance. Each resistor thus has the full voltage ... same full voltage of the source applied to it, but divide the total current amongst them

If a circuit has resistances of 5, 10, and 20 ohms connected in parallel, what is the combined resistance of the circuit? A. 1.5 ohms B. 2.9 ohms C. 17.5 ohms D. 35.0 ohms

Description : If a circuit has resistances of 5, 10, and 20 ohms connected in parallel, what is the combined resistance of the circuit? A. 1.5 ohms B. 2.9 ohms C. 17.5 ohms D. 35.0 ohms

Last Answer : Answer: B

Why the input resistance of an ideal OPAMP is infinite and output resistance is zero? secondly, how can we measure these resistances(input and output) in case of an ideal OPAMPand Real OP-AMP in the following conditions when 1- load is not connected. 2- load is connected.

Description : Why the input resistance of an ideal OPAMP is infinite and output resistance is zero? secondly, how can we measure these resistances(input and output) in case of an ideal OPAMPand Real OP-AMP in the following conditions when 1- load is not connected. 2- load is connected.

Last Answer : Ans- Ideal OP-AMP is a power ful concept. If one goes through the history of amplifying devices it becomes clear that less it loads the previous stage better the output signal. ie ... . Can refer application notes by device manufacturer available in internet for more precise and practical solutions.

If electric resistance is to be decreased, then the number of resistances should be connected in _______ (1) Series (2) Parallel (3) Mixed arrangement (4) None of these

Description : If electric resistance is to be decreased, then the number of resistances should be connected in _______ (1) Series (2) Parallel (3) Mixed arrangement (4) None of these

Last Answer : Parallel

Two resistances Rl and Ri are connected in series across the voltage...

Description : Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across?

Last Answer : Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across Rl.

___________ is device that measures the internal open circuit voltage of an equivalent noise generator having an impedance of 600Ω and delivering noise power to a 600 Ω load. A. Psophometer B. Barometer C. Reflectometer D. Voltmeter

Description : ___________ is device that measures the internal open circuit voltage of an equivalent noise generator having an impedance of 600Ω and delivering noise power to a 600 Ω load. A. Psophometer B. Barometer C. Reflectometer D. Voltmeter

Last Answer : A. Psophometer

The first stage of a two-stage amplifier has a voltage gain of 10, a 600 Ω input resistor, a 1600Ω equivalent noise resistance and 27kΩ output resistor. For the second stage, these values are 25, 81kΩ, 19kΩ, and 1MΩ, respectively. Calculate the equivalent input-noise resistance of this two stage amplifier. A. 2,518 kΩ B. 2,518 Ω C. 251.8 Ω D. 12,518 Ω

Description : The first stage of a two-stage amplifier has a voltage gain of 10, a 600 Ω input resistor, a 1600Ω equivalent noise resistance and 27kΩ output resistor. For the second stage, these values are 25, 81kΩ, 19kΩ, and 1MΩ, ... this two stage amplifier. A. 2,518 kΩ B. 2,518 Ω C. 251.8 Ω D. 12,518 Ω

Last Answer : B. 2,518 Ω

What are the value of voltage and current in star connection and in delta connection?

Description : What are the value of voltage and current in star connection and in delta connection?

Last Answer : Star connection a. IL = IPh. b. VL = √3 VPh. ∴ VPh = VL/√3. Note: in star connection we are getting neutral point and we can able to measure the phase as well as line voltage. Delta connection a. VL = VPh. b. IL = √3 IPh. ∴ IPh = IL/√3.

for Delta-Star connection of 3-phase transformer: i) Draw the connection diagram ii) List any two advantages of this connection iii) State its area of application.

Description : for Delta-Star connection of 3-phase transformer: i) Draw the connection diagram ii) List any two advantages of this connection iii) State its area of application. 

Last Answer : Disadvantages: i) In this type of connection, the secondary voltage is not in phase with the primary. Hence it is not possible to operate this connection in parallel with star-star or delta-delta ... iv) As line current is equal to phase current the conductor size of winding should be large. 

Describe the power and control circuit for automatic Star-Delta starter for 3-phase induction motor.

Description : Describe the power and control circuit for automatic Star-Delta starter for 3-phase induction motor.

Last Answer : Power circuit: Control circuit: 

A galvanometer of 65 Ω resistance gives full scale deflection with 4 mA current. In order to convert it into ammeter, the range of 10 A is connected with it, the shunt resistance should be a) 0.1 Ω b) 0.2 Ω c) 0.06 Ω d) 0.03 Ω

Description : A galvanometer of 65 Ω resistance gives full scale deflection with 4 mA current. In order to convert it into ammeter, the range of 10 A is connected with it, the shunt resistance should be a) 0.1 Ω b) 0.2 Ω c) 0.06 Ω d) 0.03 Ω

Last Answer : d) 0.03 Ω

To find current in a resistance connected in a network, Thevenin's theorem is used VTH = 20 V and RTH = 5 Ω.

Description : To find current in a resistance connected in a network, Thevenin's theorem is used VTH = 20 V and RTH = 5 Ω. The current through the resistance: (1) is 4 A (2) is 4 A or less (3) is less than 4 A (4) May be 4 A or less or more than 4 A

Last Answer : To find current in a resistance connected in a network, Thevenin's theorem is used VTH = 20 V and RTH = 5 Ω. The current through the resistance: is less than 4 A 

The main application of delta/zig-zag connected 3-phase transformer is to supply

Description : The main application of delta/zig-zag connected 3-phase transformer is to supply (A) balanced loads (B) unbalanced loads (C) furnace loads (D) single-phase loads

Last Answer : The main application of delta/zig-zag connected 3-phase transformer is to supply unbalanced loads

Four equal resistors are connected in parallel, each resistor has an ohmic value of 100 ohms, what is the equivalent resistance?

Description : Four equal resistors are connected in parallel, each resistor has an ohmic value of 100 ohms, what is the equivalent resistance?

Last Answer : 25 ohms

N resistors of each of resistance R when connected in series offer an equivalent resistance of 50 ohm and when reconnected in parallel the effective resistance is 2 ohm the value of R is

Description : N resistors of each of resistance R when connected in series offer an equivalent resistance of 50 ohm and when reconnected in parallel the effective resistance is 2 ohm the value of R is

Last Answer : 25 ohms

What is the equivalent resistance of a network having 5 resistors of each 10ohm connected in parallel?

Description : What is the equivalent resistance of a network having 5 resistors of each 10ohm connected in parallel?  (A) 10 Ohms (B) 50 Ohms (C) 500 Ohms (D) 2 Ohms 

Last Answer : D) 2 ohms Solution: 1/Rt = (1/R)(n) 1/Rt = (1/10) (5) 1/Rt = 5/10    Rt = 2 ohms