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

1 Answer

Answer :

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 150 W

Related questions

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

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

Last Answer : Primary side is low voltage side and secondary side is high voltage side.

Description : A circuit that binds the upper or lower extreme of a waveform to a fixed DC voltage level is called ______ A) DC voltage restorer B) Clamping circuit C) Both A and B D) None of these

Last Answer : A circuit that binds the upper or lower extreme of a waveform to a fixed DC voltage level is called ______ A) DC voltage restorer B) Clamping circuit C) Both A and B D) None of these

Description : Describe the difference between an open circuit and a short circuit.

Last Answer : Open circuit means the wire is cut meaning power will not flow and close circuit means wire is not cut and hence power will flow.Short circuit is the same as close circuit

Last Answer : It is required to measure the true open circuit e.m.f. of a battery. The best device is D.C. potentiometer.

Description : During open circuit test of a transformer?

Last Answer : During open circuit test of a transformer primary is supplied rated voltage.

Description : Explain open emitter BJT drive circuit.

Last Answer : open emitter BJT drive circuit:

Description : 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

Last Answer : 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

Last Answer : Open circuited armature coil of a D.C. machine is identified by the scarring of the commutator segment to which open circuited coil is connected and indicated by a spark completely around the commutator.

Description : Source transformation Replace the circuit with voltage source in series with a single resistor

Last Answer : Source transformation Replace the circuit with voltage source in series with a single resistor

Description : 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 :

Last Answer : 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 : 200 V

Last Answer : If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens this will make armature to take heavy current, possibly burning it.

Description : Identify the increasing order of voltage regulation of the following dc generators a same load :  (A) differential compound, shunt and under compound  (B) shunt, differential compound and ... C) under compound, shunt and differential compound  (D) shunt, under compound and differential compound

Last Answer : Identify the increasing order of voltage regulation of the following dc generators a same load : under compound, shunt and differential compound 

Last Answer : In a level compounded D.C. generator, full load terminal voltage is equal to no-load terminal voltage.

Description : The arc voltage in a circuit breaker is :

Last Answer : The arc voltage in a circuit breaker is : in phase with the arc current

Description : An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be  (1) unaffected (2) decreased (3) increased (4) either decreased or increased depending on the direction of the DC field

Last Answer : An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be either decreased or increased depending on the direction of the DC field

Last Answer : The arc voltage produced in A.C. circuit breaker is always in phase with the arc current.

Last Answer : The voltage appearing across the contacts after opening of the circuit breaker is called recovery voltage.

Description : State maximum power transfer theorem for DC circuit.

Last Answer : Maximum power transfer theorem for DC circuit: The maximum power transfer theorem states that the source or a network transfers maximum power to load only when the load resistance is equal ... removed (disconnected) ii) All internal independent sources are replaced by their internal resistances.

Description : Define- (i) Node (ii) Loop for a DC circuit

Last Answer : Ans: i) Node: A point or junction at which two or more elements of network are connected is called as node. ii) Loop: A closed path for flow of current in an electrical circuit is called loop.

Description : For a DC circuit capacitor is

Last Answer : For a DC circuit capacitor is virtually an open circuit

Description : Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio of 2 : 3 : 4 respectively? A) 2 : 3 : 4 B) 6 : 4 : 3 C) 4 : 3 : 2 D) None of these

Last Answer : Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio of 2 : 3 : 4 respectively? A) 2 : 3 : 4 B) 6 : 4 : 3 C) 4 : 3 : 2 D) None of these

Description : The power factor of a D.C. circuit is always?

Last Answer : The power factor of a D.C. circuit is always unity.

Description : All the rules and laws of D.C. circuit also apply to A.C. circuit containing?

Last Answer : All the rules and laws of D.C. circuit also apply to A.C. circuit containing resistance only.

Description : An open resistor, when checked with an ohm-meter reads?

Last Answer : An open resistor, when checked with an ohm-meter reads infinite.

Description : Limitation and application of High Voltage DC (HVDC)

Last Answer : Limitation and application of High Voltage DC (HVDC) :  Limitation:- 1) It is difficult to step up and step down DC voltage like AC voltage. 2) Special cooling ... conventional/non-conventional) 12) Increasing existing grid utilization. 13) Interconnection of different grids or networks

Description : Is the power line voltage available in our homes a dc or an ac voltage?

Last Answer : The power line voltage available in our homes is AC. Mobile dwellings are the most commonly DC-supplied homes and even then they tend to include AC supply for heavier loads.

Description : Explain DC coupled drive circuit with unipolar output.

Last Answer : DC coupled drive circuit with unipolar output: The figure shows the circuit and waveforms

Description : A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while the chopper feeds an RL load. The per unit current ripple would  (1) increase progressively  (2 ... 0.5 and then increase  (4) increase to a maximum value at α = 0.5 and then decrease

Last Answer : A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while the chopper feeds an RL load. The per unit current ripple would increase to a maximum value at α = 0.5 and then decrease

Last Answer : The voltage used for suburban trains in D.C. system is usually 600 to 750 V.

Last Answer : The armature voltage control of D.C. motor provides constant torque drive.

Description : If resistance is 8 Ohm and current is 16 ampere then what will be the voltage and power?

Last Answer : 128 volts ,2048 watts

Description : At ______ frequencies the parallel R-L circuit behaves as purely resistive.

Last Answer : At very high frequencies the parallel R-L circuit behaves as purely resistive.

Description : In a pure resistive circuit?

Last Answer : In a pure resistive circuit current is in phase with the voltage.

Description : What is the power factor of purely resistive circuit.

Last Answer : Unity that is 1

Description : 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

Last Answer : In a pure resistive circuit, the average power Pavg is One-half of the peak power Pmax.

Description : What are the disadvantages of Open loop control system?

Last Answer : Open loop control system are less reliable. In open loop control system Optimization is not possible. Open loop control system are less accurate.

Description : Why CT is never operated with an open secondary ?

Last Answer : CT secondary should never be kept open because it will cause saturation of the core to a high level and very high voltage will appear across the secondary which can breakdown the insulation. One terminal of PT secondary is always grounded to avoid capacitive induction and for human safety

Last Answer : A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be about 2 V.

Description : We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance R.A. voltmeter having a resistance of 1.2 kOhm is connected across 600 Ohm resistance and read 5v. The value of resistance R will be

Last Answer : We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance R.A. voltmeter having a resistance of 1.2 kOhm is connected across 600 Ohm resistance and read 5v. The value of resistance R will be 2.4 kOhm

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]

Description : At a particular instant, the R-phase voltage of a balanced 3-phase system is + 30 V, and the Y-phase voltage is – 90 V. The voltage of B-phase at that instant is (A) + 120 V (B) – 120 V (C) – 60 V (D) + 60 V

Last Answer : At a particular instant, the R-phase voltage of a balanced 3-phase system is + 30 V, and the Y-phase voltage is – 90 V. The voltage of B-phase at that instant is + 60 V

Description : How to Open a Tight Jar Lid

Last Answer : How to Open a Tight Jar Lid There are instances when you buy a stubborn jar of pickles (Learn how to pickle), peanut butter or mayonnaise that you can't open with your hands. It can drive you ... no time. If you enjoy reading this article, you might as well read how to can fruits and vegetables.

Description : How to Open a Can without a Can Opener

Last Answer : How to Open a Can without a Can Opener You're dying to sink your teeth into those canned peaches, but you find yourself without any can opener. At times like this, many people would easily give up ... you'll soon find yourself enjoying the yummy contents of the can. Be careful not to spill the food!

Description : Open-Face Shrimp Melt

Last Answer : Open-Face Shrimp Melt - serves 2 Preparation - 15 minutes 3 ounces shelled and deveined cooked small shrimp, cut lengthwise into halves 1/4 cup chopped celery 2 tbsp chopped scallion (green ... baking sheet arrange sandwiches and broil 6 inches from heat source until cheese melts, about 1 minute.

Description : What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth 

Last Answer : What will happen to the gain margin if the gain of the open loop system is doubled? A) Doubled B) Becomes half C) Is not affected D) Becomes one-fourth 

Description : If the gain of the open loop system is doubled, the gain margin  (1) Is not affected (2) Gets doubled (3) Becomes half (4) Becomes one -forth

Last Answer : If the gain of the open loop system is doubled, the gain margin Becomes half

Last Answer : If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will stop.