17 views
in Electrical Engineering by
A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is: A. 8.57% B. 42.85% C. 4.28% D. 85.7%

Your answer

Thanks for your contribution. Feel free to answer this question. Please avoid short answer. Your answer is most welcome. Be genuine.

Upload image or document:

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.
Anti-spam verification:
Are you a robot ? (Y = Yes / N = No)
To avoid this verification in future, please log in or register.

1 Answer

0 votes
by

A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is: 85.7%

Related questions

0 answers 47 views

A plant with 10 MW installed capacity produces an annual output of 6 × 6 10 kWh and remains in operation for 2000 hours in a year. The Plant Use Factor is (A) 0.33 % (B) 3.33 % (C) 15 % (D) 30 % 

asked Jun 4, 2018 in Power system by Shimroz123
0 answers 22 views

The power supply whose output voltage varies with variation in input voltage or output load current is known as   (a) Regulated Power Supply (b) Unregulated Power Supply (c) Uninterruptible Power Supply (d) Switched Mode Power Supply 

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
0 answers 38 views

A balanced Delta connected load supplied with 440 V 50 Hz three phase AC supply has R=10 Ohm and L=0.6 mH in is each arm. Calculate line and phase current, active power.

asked Aug 12, 2018 in Basic electrical and electronics engineering by Quiz
0 answers 54 views

A 1-phase, 7.46 kW motor is supplied from a 400 V, 50 Hz A.C mains. Its efficiency is 85% and power factor is 0.8 lagging. Calculate the KVA input (1) 9.56 kVA (2) 5.4 Kva (3) 10.97 kVA (4) 8.6 kVA 

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
1 answer 26 views

3kW load is supplied by an autotransformer with 0.7 transformation ratio. Conductively transferred power from primary to secondary is (A) 2.1 kW (B) 0.9 kW (C) 4.29 kW (D) 3 kW

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
0 answers 94 views

 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

asked Apr 26 by Hussein
0 answers 19 views

A modulo -6 ripple counter with J-K flip-flops uses at the clear input, the output from (a) NAND gate with QB,Qc as inputs (b) NAND gate with QA, Q8 as inputs (c) NAND gate with QA, Qc as inputs (d) AND gate with QB, Qc as inputs

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
1 answer 27 views

The total power of an AM transmitter having a carrier power of 50 W and the percentage of modulation at 80% is A) 50 W B) 66 W C) 68 W D) 70 W 

asked Jun 18, 2018 in Electronics Engineering by Shimroz123
0 answers 32 views

 AM transmitter has a carrier power of 30 W. The percentage of modulation is 85%. Calculate the total power : (A) 5.4 W (B) 40.8 W (C) 10.8 W (D) 20.4 W

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
0 answers 17 views

If modulation index is 0.6, maximum power efficiency (in %) of AM is about  A) 60 B) 30 C) 20 D) 10

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 84 views

The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 34 views

The ratio of rotor output to rotor input in an induction motor is 0.96. The slip of the motor is (a) 0.04% (b) 4% (c) 6% (d) 12%

asked May 25, 2018 in Induction Machine by Shimroz123
0 answers 19 views

The efficiency of a transformer at full load 0.8 p.f lagging is 90%. Its efficiency at full load 0.8 p.f leading will be (1) Less than 90% (2) More than 90% (3) 90% (4) None of these 

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
1 answer 26 views

If the output filter capacitor in a power supply actually had a value twice its stated value, which of the following symptoms would be found?   a. The output voltage would be doubled and a small improvement in the ripple voltage would be detected.  b. The ripple voltage would be half of what is expected and a ... output voltage would be detected.  c. The output and ripple voltage would be greater than expected.  d. The output and ripple voltage would be less than expected.

asked May 17, 2018 in Capacitor by Shimroz123
0 answers 13 views

The output clock frequency for a frequency division circuit having 11 flipflops with an input clock frequency of 20.48 MHz is : (A) 10.24 kHz (B) 5 kHz (C) 10 kHz (D) 5.12 kHz

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
0 answers 19 views

The power input to the rotor of a 400V, 50 Hz 6 pole three phase induction motor is 20kW. The slip is 3%. The frequency of rotor currents is: (A) 1 Hz (B) 1.5 Hz (C) 2 Hz (D) 1 2 Hz

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
1 answer 19 views

The output power of a filter is 100 mW, when the signal frequency is 6 kHz. When the frequency is increased to 25 kHz, the output power falls to 50 mW. What is the dB change in power ? (a) -3 dB (b) -5 dB (c) -7 dB (d) -2 dB

asked Apr 23, 2018 in Electrical Engineering by Zeeshan
0 answers 20 views

One 200 V, 100 W bulb is connected in series with primary of a 200 V, 10 kVA transformer. If its secondary is kept open circuited, then the bulb would have (1) Full brightness (2) Poor brightness (3) A little less than full brightness (4) More than full brightness 

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
1 answer 31 views

A relay has a rating of 5 A, 2.2 sec IDMT and a relay setting of 125% TMS = 0.6. It is connected to a supply circuit through a C.T. 400/5 ratio. The fault current is 4000 A. The operating current of the relay is

asked May 3, 2018 in Switchgear And Protection by Shimroz123
1 answer 24 views

Draw the circuit diagram of bridge rectifier with π filter. Draw its input and output waveform. 

asked Jul 10 in Elements of Electronics by Shimroz123
0 answers 23 views

A coil has 100 turns produces a flux change of 0.01 webers when current changes by 100mA. Its inductance (in H) value is  A) 5 B) 10 C) 1 D) 0.1

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
0 answers 15 views

Total numbers of ascending runs in the sequence 4 6 7 2 9 1 2 8 9 3 0  (1) 3 (2) 5 (3) 7 (4) 9  

asked Apr 10, 2018 in Computer Engineering by Shimroz123
1 answer 67 views

An amplifier has input power of 2 microwatts. The power gain of the amplifier is 60 dB. The output power will be

asked May 3, 2018 in Power Electronics by Shimroz123
1 answer 25 views

The output of logic gate is '1' when all its inputs are at logic '0' The gate is (A) NAND/EX-OR (B) NOR/EX-OR (C) AND/EX-NOR (D) NOR/EX-NOR

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
1 answer 20 views

The input frequency of a bridge rectifier is 50 its output frequency will be  1. 25 Hz 2.50 Hz 3.75 Hz 4. 100 Hz

asked May 13, 2018 in Power Electronics by Shimroz123
1 answer 27 views

Determine the output frequency for a frequency division circuit that contains 12 flip–flops with an input clock frequency of 20.48 MHz: (1) 10.24 kHz (2) 5 kHz (3) 30.24 kHz (4) 15 kHz 

asked May 28, 2018 in Digital Electronics by Shimroz123
0 answers 17 views

A diesel power station spends 0.25 kg/kWh fuel. If the calorific value is 10,000 kcal/kg then overall efficiency of the power station will be   (a) 25% (b) 30% (c) 34.4% (d) 100% 

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
1 answer 13 views

A full adder is a combinational circuit that performs the arithmetic sum of three input bits and produces a (a) sum output (b) sum output and a carry (c) sum output with two carries (d) two sums with two carries

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
0 answers 51 views

 A J -K flip-flop with J= 1 and K= 1 has a 20 kHz clock input. The Q output is : (A) Constant and low (B) Constant and high (C) A square wave with 20 kHz frequency (D) A square wave with 10 kHz frequency

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
0 answers 16 views

What will be the output of following code segment: int i=-7; printf(“%d”,0<!i); (1) 0 (2) non zero value (3) error (4) unpredictable value

asked Apr 10, 2018 in Computer Engineering by Shimroz123
1 answer 23 views

Consider a cube of material of sides 1 cm with a resistance of 0.003 Ω between its opposite faces. What is the resistance if the same volume of the material is drawn into a length of 50 cm with a uniform cross – section? A) 0.003 Ω B) 0.15 Ω C) 7.5 Ω D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
0 answers 440 views

A 220 V, 200 W bulb and a 220 V, 100 W bulb are connected in series across a 220 V supply, the power consumed by them will be (a) 33.3 W (b) 66.6 W (c) 100 W (d) 300 W

asked May 25, 2018 in Electrical Engineering by Shimroz123
0 answers 44 views

A thyristor is triggered by a pulse train of 5 kHz. The duty ratio is 0.4. If the allowable average power is 100 W, the maximum allowable gate drive power will be 

asked May 25, 2018 in Power Electronics by Shimroz123
1 answer 34 views

If the feedback factor of an amplifier is 0.1 and its gain without feedback is 40, then its gain with feedback is (a) – 13.3 (b) 200 (c) 8 (d) 10 

asked May 25, 2018 in Amplifier by Shimroz123
0 answers 49 views

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

asked Jun 4, 2018 in Electrical Engineering by Shimroz123
1 answer 11 views

The rotor frequency for a 3-phase 6-pole, 1000 r.p.m. induction motor with a slip of 0.04 is (a) 2 Hz (b) 4 Hz (c) 6 Hz (d) 8 Hz  

asked May 25, 2018 in Induction Machine by Shimroz123
1 answer 45 views

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

asked May 3, 2018 in Power system by Shimroz123
1 answer 18 views

What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 41 views

When 7/0.029 V.I.R cable is carrying 20 A, a drop of 1 V occurs every 12 m. The voltage drop in a 100 m run of this cable when it is carrying 10 A is nearly  (a) 4.2 V (b) 3.2 V (c) 1.2 V (d) 0.42 V

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
1 answer 77 views

In a full wave rectifier with input frequency of 50 Hz, the frequency of the output is: (1) 50 Hz (2) 100 Hz (3) 150 Hz (4) 200 Hz

asked May 29, 2018 in Electronics Engineering by Shimroz123
1 answer 10 views

For an earth station transmitter, with an antenna output power of 40dBW 10,000W, a back-off loss of 3dB, a total branching and feeder loss of 3dB, a total branching and feeder loss of 3dB and transmit antenna gain of 4dB, the effective isotropic radiated power (EIRP will be  a) 38dBW b) 40 dBW c 36 dBW d) 47 dBW

asked Jun 15, 2018 in Electronics Engineering by Shimroz123
1 answer 26 views

A passive two port network is in a steady state. Compared to its input, the steady state output can never offer  A) Higher voltage B) Lower impedance C) Greater power D) Better regulation

asked May 20, 2018 in Network Analysis by Shimroz123
1 answer 16 views

A passive 2-port network is in a steady state, compared to its input, the steady state output can never offer   (a) Higher voltage (b) Lower impedance (c) Greater power (d) Better regulation

asked May 13, 2018 in Network Analysis by Shimroz123
1 answer 26 views

lf slip of an induction machine is 0.02 and the stator supply frequency is 50 Hz, what will be the frequency of the rotor induced e.m.f.? (A) 10 Hz (B) 50 Hz (C) 1 Hz (D) 2500 Hz

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
1 answer 18 views

A 35 V dc supply is connected across 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 resistances and reads 5 V. The value of resistance R shall be:

asked May 22, 2018 in Electrical Engineering by Shimroz123
1 answer 20 views

A single-phase ac voltage source has 200 V rms and a system connected consumes an active power of 300 W. What is the reactive power consumed by the system if 2.5 A rms current is drawn ?  (a) 100 VAR (b) 200 VAR (c) 300 VAR (d) 400 VAR

asked Apr 23, 2018 in Electrical Engineering by Zeeshan
1 answer 43 views

For a short transmission line with r/x ratio of is 1.0, the regulation will be zero when the load power factor is

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
1 answer 25 views

The output of a JK flip-flop with asynchronous preset and clear inputs is ‘1’. The output can be changed to ‘0’ with one of the following conditions by applying A) J = 0, K = 0 and using a clock B) J = 1, K = 0 and using the clock C) Asynchronous preset input D) J = 1, K = 1 and using the clock 

asked Jun 17, 2018 in Digital Electronics by Shimroz123
1 answer 9 views

An AC supply of 230 V is applied to half wave rectifier circuit. A transformer turns ratio is 20 : 1. Find i) Output DC voltage (ii) Peak Inverse Voltage (PIV)

asked Jul 10 in Elements of Electronics by Shimroz123

Welcome to electronics2electrical.com here you can ask questions related to electrical, electronics, mechanical, telecommunication, instrumentation, computer, mathematics, physics etc.
Be respectful to all the members. Do not copy and paste the answers from other websites which have copyright content. While asking question give full details about it.

Categories

Most popular tags

power motor dc circuit transformer voltage current used system phase resistance factor synchronous load ac energy induction electric generator series frequency between speed capacitor use electrical meter line difference control type mosfet transmission magnetic plant high single instrument bjt unit source advantages function diode and machine winding field define torque parallel amplifier supply shunt thyristor motors electricity arduino maximum time relay armature problem value on transformers types coil diagram state flow ratio material three formula starting direction theorem method emf operating efficiency digital wave microprocessor test instruments inductance loss measure operation connected signal low applications effect single-phase network temperature working constant losses different law wattmeter measuring compare controlled breaker drive device logic rc full switch flux wire resistivity disadvantages free of materials machines angle force converter conductor transistor gain open protection scr core measurement number bridge principle generators reactance circuits negative the friction iron loop short pole battery conservation steam resistors hysteresis computer using analog lines secondary station gate a rectifier inverter linear induced relays nuclear capacitance basic characteristics design direct work rotor electronics ammeter forces diesel damping rlc connection factors capacitors minimum insulation moving regulation running self systems air fault range main stability quality starter igbt eddy alternator ideal rl average 3-phase plants arc thermal error fuzzy biasing dielectric pressure balanced superposition errors copper rotation feedback impedance measured electronic electrons charge inductive transfer explain start off back curve over solar is three-phase tariff locomotive peak bias zener engineering commutator surge conductors rating universal potentiometer density permanent mechanical transducer capacity memory adc excitation two fuse pure harmonics application semiconductor inductor internal pmmc reaction welding resonance traction permeability breakers rms designed electromagnetic si generation brushes switching capacitive shaded rate 1 distribution resistor methods delta star oscillator reluctance simplification algebra 8085 boolean weston dynamometer insulating strength installation definition fuel heating earth units

8,503 questions

7,101 answers

134 comments

3,090 users

...