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What is the connection of winding of capacitor start motor

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 When The dc converter in figure shown has a resistance load of Rimage = 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

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0 answers 21 views

A dc shunt motor runs at 500 r.p.m at 220 V. A resistance of 4.5 Ω is added in series with the armature for speed control. The armature resistance is 0.5 ohms. The current to stall the motor will be (1) 44 A (2) 50 A (3) 44.4 A (4) 60 A  

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
1 answer 5 views

As shown in the figure, 1 ohm resistance is connected across a source that has a load line v + i = 100. The current through the resistance is A) 25 A B) 50 A C) 100 A D) 200A

asked May 20, 2018 in Network Analysis by Shimroz123
1 answer 18 views

Consider the star network shown in figure. The resistance between terminals A and B with C open is 6 ohms, between terminals B and C withAopen is 11 ohms and between terminals C andAwith B open is 9 ohms. Then RA, RB, RC respectively is 

asked May 20, 2018 in Network Analysis by Shimroz123
0 answers 18 views

When the SCR conducts, the forward voltage drop will   (a) 0.7 V at all load current (b) 2 to 2.5 V at all load current (c) increases slightly with load current (d) remains constant with load current 

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
1 answer 30 views

A 220 V dc machine has an armature resistance o f 1-ohm. If the full load current is 20A, the difference in the induced voltage when the machine is running as a motor, and as a generator is

asked Apr 1, 2018 in Electrical Engineering by Shimroz123
0 answers 23 views

A diode D, resistor R and inductor L and a switch S are connected in series.When a voltage V is applied across the circuit and switch is put on, the voltage across L changes as  A) V(1-exp(-t R/L)) B) Vexp(-t R/L) C) Ldi/dt +Ri D) V(1-t R/L)

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 135 views

The frequency of the clock signal applied to the rising edge triggered D flip-flop shown in figure is 10 KHZ. The frequency of the signal at Q is A) 10 KHz B) 2.5 KHz C) 20 KHz D) 5 KHz

asked May 20, 2018 in Digital Electronics by Shimroz123
0 answers 17 views

DC ammeter has a resistance of 0.1 Ω and its current range is 0-100 A. If the range is to be extended to 0-300 A, what shunt resistance need to be connected?  A) 0.025 Ω B) 0.05 Ω C) 0.015 Ω D) 0.03 Ω

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
1 answer 17 views

In a 3-phase half-wave rectifier, if per phase input is 200 V, then the average output voltage is   (a) 233.91 V (b) 116.95V (c) 202.56 V (d) 101.28V 

asked May 13, 2018 in Power Electronics by Shimroz123
1 answer 28 views

Assume that the n-channel MOSFET shown in figure is ideal and that its threshold voltage is +1 .0 V. The voltage Vab between nodes a and b is A)5V B)2V C)1V D)0V

asked May 20, 2018 in MOSFET by Shimroz123
1 answer 14 views

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

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
2 answers 21 views

Ripple in output current of a step-down chopper feeding RLE load is maximum, when duty cycle is equal to:  (1) 1 (2) 0.5 (3) 0.75 (4) 0.33

asked May 22, 2018 in Electronics Engineering by Shimroz123
1 answer 9 views

For the circuit shown in figure, the Boolean expression for the output y in terms of inputs P, Q, R and S is

asked May 20, 2018 in Digital Electronics by Shimroz123
1 answer 19 views

A 200 V, 5 A d.c. energy meter is tested at its marked ratings. The resistance of the pressure circuit is 8000 Ω and that of current coil is 0.1 Ω. The power consumed when testing the meter with phantom loading with current circuit excited by a 6 V battery is (A) 2.5 W (B) 5 W (C) 32.5 W (D) 35 W

asked Apr 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 23 views

A 1mA D' Arsonval movement has resistance of 100 Ω. It is to be converted to a 10 V voltmeter. The value of multiplier resistance is  (A) 999 Ω (B) 9999 Ω (C) 9900 Ω (D) 990 Ω 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 22 views

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

asked Apr 29, 2018 in Electrical Engineering 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 6 views

If the no load voltage of a certain generator is 220V and the rated load voltage is 200V, then the voltage regulation is: a. 1% b. 10% c. 20V d. 9%

asked Sep 1, 2018 by Shimroz123
1 answer 31 views

A voltage signal 10 Sinwt is applied to the circuit with ideal diodes, as shown in figure. The maximum and minimum values of the output waveform vout of the circuit are respectively

asked May 20, 2018 in Network Analysis by Shimroz123
1 answer 40 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 25 views

An amplifier without feedback has a voltage gain of 50, input resistance 1kΩ and output resistance of 2.5kΩ. The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 would be: (1) 1/11 kΩ (2) 1/5 kΩ (3) 5 kΩ (4) 11 kΩ

asked May 29, 2018 in Amplifier by Shimroz123
1 answer 27 views

A low noise amplifier has an effective noise temperature of 50 k. The absolute noise figure is

asked May 23, 2018 in Amplifier by Shimroz123
0 answers 21 views

For an 8 bit DAC, reference voltage is 10 V. If input to DAC starting from MSB is 10111100, output (in volts) is  A) 5.8 B) 6.4 C) 7.3 D) 8.2

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
0 answers 23 views

The output voltage of a battery drops from 100 V with zero load current to 80 V when load current is 2 A. The internal resistance of the battery is (a) 10 Ω (b) 20 Ω (c) 40 Ω (d) 50 Ω

asked May 25, 2018 in Battery by Shimroz123
1 answer 21 views

The output voltage V0 ofthe Schmitt trigger shown in figure swings between +15V and —1 5V. Assume that the operational amplifier is ideal. The output will change from +1 5 V to -1 5V when the instantaneous value of the input sine wave is  A) 5 V in the positive slope only B) 5 V in the negative slope only C) Vin the positive and negative slopes D) 3 V in the positive and negative slopes

asked May 20, 2018 in Power Electronics by Shimroz123
1 answer 6 views

If the rms voltage drop across a 15 kilt resistor is 16 V, the peak current through the resistor is : -  a) 15 mA b) 1.5 mA c) 10 mA d) 1 mA

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
1 answer 18 views

In an R-2R ladder D/A converter, the input resistance is  1. Not same for all digital inputs 2. R for each input 3. 2R for each input 4. 3R for each input 

asked May 13, 2018 in Electronics Engineering by Shimroz123
0 answers 20 views

The duty ratio of a step-up chopper with an output voltage of 200 V from a 80 V dc source, is (A) 0.4 (B) 0.5 (C ) 0.6 (D) 1.5 

asked Jun 4, 2018 in Power Electronics by Shimroz123
0 answers 27 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) 0.1 pF (B) 1 pF (C) 0.1 μ F (D) 1 μ F

asked Mar 31, 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
1 answer 24 views

A single-phase transformer has a turns ratio of 1 :2 and is connected to a purely resistive load as shown in the figure. The magnetizing current drawn is 1A, and the secondary current is 1A. Ifcore losses and leakage reactances are neglected, the primary current is  A)1.41A B)2A C) 2.24A D)3A

asked May 20, 2018 in Transformer by Shimroz123
1 answer 10 views

 The effective resistance of a coil at high frequency is more than its de resistance on account of : -  a) Skin effect b) Proximity effects c) Eddy current losses d) All the above

asked Apr 10, 2018 in Instrumentation and control by Shimroz123
1 answer 36 views

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is

asked May 3, 2018 in Electrical Machine by Shimroz123
1 answer 8 views

The rms value of the current in a wire which carries a d.c. current of 10 A and a sinusoidal alternating current of peak value 20 A is  (A) 10 A (B) 14.14 A (C) 15 A (D) 17.32 A

asked May 18, 2018 in Engineering electromagnetic by Shimroz123
1 answer 19 views

A transmission line of 200 km has a certain A, B, C and D parameters. If the length is reduced to 60 km

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 17 views

In computer system Scanner is _________device. A. Input B. Output C. Both D. None 

asked Apr 12, 2018 in Electronics Engineering by Shimroz123
1 answer 10 views

The following is correct : (A) P = V x I (B) P = I ² x R (C) P = V ² / R (D) All of the above

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 13 views

The ripple voltage in the output of a single phase half wave rectifier with 10 V rectified dc voltage with resistive load and without filter will be • 12.1 volt • 1.21 volt • 0.482 volt • 4.82 volt

asked May 13, 2018 in Electronics Engineering by Shimroz123
0 answers 27 views

A series R-L circuit is suddenly connected to d.c. voltage source of V volts. The current in this series circuit, just after the switch is closed, is equal to (1) Zero (2) V/L (3) V/C (4) V.L/C 

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
0 answers 26 views

The maximum flux in a transformer is φm when primary voltage is V and the frequency is f. If the primary voltage is 2 V and frequency is f/2, the flux will be (a) 4 φm (b) 0.25 φm (c) φm (d) 0.5 φm

asked May 25, 2018 in Transformer by Shimroz123
0 answers 7 views

What is the output voltage of a battery if 10 J of energy is expended in moving 1.25 C of charge?

asked Jul 1 by Shimroz123
1 answer 22 views

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

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 32 views

A series RLC circuit has a resonant frequency of 1 KHz and a quality factor Q = 100. If each of the R,L and C is doubled from its original value, the new Q of the circuit is:  (1) 25 (2) 50 (3) 100 (4) 200

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
0 answers 49 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 13 views

If the load current and flux of a DC motor are held constant, and voltage applied across its armature is increased by 10%, its speed will:  (A) Decrease by 10%. (B) Remain unchanged. (C) Increase by 10%. (D) Increase by 20%. 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
0 answers 52 views

A single phase, half-wave, controlled rectifier has 400 sin (314 t) as the input voltage and R as the load. For a firing angle of 60° for the SCR, the average output voltage is   (a) 240/π (b) 400/π (c) 300/π (d) 200/π 

asked Apr 10, 2018 in Electrical Engineering by Shimroz123

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