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A metal oxide varistor (MOV) is used for protecting:

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In a power supply a shorted input capacitor is likely to result in No voltage output.

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The presence of alkali oxides in alumino silicate ceramics is likely to result in dielectric breakdown due to   (A) Polarization (B) Conductivity (C) Structural homogeneties (D) Ionization

asked May 16, 2018 in Electrical Engineering by Shimroz123
1 answer 13 views

Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in?

asked Mar 19, 2018 in Transformer by Zeeshan
1 answer 24 views

A cylindrical rotor synchronous motor is switched on to the supply with its field windings shorted on themselves, the motor will .  A) Not start B) Start but will not run at synchronous speed C) Start as an induction motor and then run as a synchronous motor D) Start and run as a synchronous motor

asked May 20, 2018 in Synchronous machine by Shimroz123
0 answers 15 views

For a two port network, with output shorted, V1=25V, I1=1 A,I2=2A. With input open circuited, V1=10 V,V2= 50 V,I2= 2 A. h12 and h21 are  A) 0.2 and 25 B) 25 and 0.2 C) 0.4 and 2 D) 0.2 and 2

asked Apr 9, 2018 in Electronics 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 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
1 answer 17 views

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%

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
1 answer 25 views

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will?

asked Mar 20, 2018 in Induction Machine by Shimroz123
1 answer 23 views

Power factor of an inductive circuit is usually improved by connecting capacitor to it in?

asked Mar 25, 2018 in Electrical Engineering 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
1 answer 70 views

In case the height of transmission tower is increased, which of the following parameter is likely to change?  (A) Resistance (B) Inductance (C) Capacitance (D) None of the above

asked May 8, 2018 in Electric Power Transmission 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 20 views

At an industrial sub-station with a 4 MW load, a capacitor of 2 MVAR is installed to maintain the load power factor at 0.97 lagging. If the capacitor goes out of service, the load power factor becomes (A) 0.85 (B) 1.00 (C) 0.80 lag (D) 0.90 lag

asked May 25, 2018 in Power system by Shimroz123
1 answer 14 views

A solar cell of 350 V is feeding power to an ac supply of 440 V, 50 Hz through a 3-phase fully controlled bridge converter. A large inductance is connected in the dc circuit to maintain the dc current at 20 A. If the solar cell resistance is 0.5 Ohm ,then each thyristor will be reverse biased for a period of  (A) 125o (B) 120o (C) 60o (D) 55o

asked May 18, 2018 in Power electronics converters by Shimroz123
1 answer 224 views

Total instantaneous power supplied by a 3-phase ac supply to a balanced R-L load is

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
1 answer 17 views

The input to a coherent detector is DSB-SC signal plus noise. The noise at the detector output is:  (1) The in-phase component (2) The quadrature-component (3) Zero (4) The envelope

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

A control system with excessive noise, is likely to suffer from?

asked Mar 27, 2018 in Control System by Shimroz123
1 answer 37 views

 An AC supply of 230 V is applied to a half-wave rectifier circuit through a transformer having primary to secondary turn’s ratio 12:1. The peak inverse voltage is A) 8.62 V B) 12 V C) 19.17 V D) 27.11 V 

asked Jun 18, 2018 in Electronics 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 10 views

The threshold effect in demodulators is a) The rapid fall of output SNR when the input SNR falls below a particular value b) Exhibited by all the demodulators when the input SNR is low c) Exhibited by all AM suppressed carrier coherent demodulators d) Exhibited by correlation receivers

asked Jun 15, 2018 in Electronics 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 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
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 11 views

In a klystron amplifier the input cavity is called:  (1) Buncher (2) Catcher (3) Pierce gun (4) Collector

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 15 views

A capacitor and coil in parallel is called

asked May 14, 2018 in Electronics Engineering by Shimroz123
0 answers 18 views

What is the role of a capacitor in a circuit?

asked Mar 15, 2018 in Electronics Engineering by Quiz
1 answer 15 views

In a half-wave rectifier, if an a.c supply is 60 Hz. Then what is the a.c ripple at output? (A) 30 Hz (B) 60 Hz (C) 20 Hz (D) 15 Hz

asked Apr 26, 2018 in Electronics Engineering by Shimroz123
1 answer 7 views

Two wattmeters connected to measure the power input to a balanced three-phase circuit indicate 4.5 KW and 3 KW respectively. Find the power factor of the circuit. A. 0.7 B. 0.8 C. 0.95 D. 0 

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
1 answer 25 views

An _____________is a network of electrical components used to supply, transfer and use electric power:  (A) Electric power system (B) Electric power (C) All of the above (D) None of the above

asked May 8, 2018 in Power system by Shimroz123
0 answers 42 views

We wish to build a 135 V, 20 A, DC power supply using a single phase bridge rectifier and an inductive filter. The peak to peak current ripple should be about 10%. If a 60 Hz AC source is available; Calculate the peak to peak current ripple.  (A) 19 A (B) 20 A (C) 2 A (D) 1 A 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
0 answers 21 views

A oscilloscope 4cmX4cm screen has its own sweep out, fed back to its input if x&y Sensitivities are same, the oscilloscope will display  A) triangular wave B) diagonal line C) sine wave D) Circle

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 19 views

A word processor would most likely be used to do A) Keep an account of money spent B) Do a computer search in media center C) Maintain an inventory D) Type a biography

asked Apr 12, 2018 in Computer 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 15 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 22 views

The steam input in to a turbogenerator connected to infinite bus is increased. Which of the events will take place? (a) The generator will feed more leading KVAR to bus bar and power angle will not change (b) The generator will feed more real power to bus bar and power angle will increase (c) The generator will feed more power to bus bar and power angle will decrease (d) The generator will feed more lagging KVAR to bus bar and power angle will not change

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
1 answer 10 views

No-load test on a 3-phase induction motor was conducted at different supply voltage and a plot of input power versus voltage was drawn. This curve was extrapolated to intersect the y-axis. The intersection point yields  (A) Core loss (B) Stator copper loss (C) Stray load loss (D) Friction and windage loss

asked May 17, 2018 in Induction Machine by Shimroz123
1 answer 3 views

The period corresponding to 50 Hz power supply is

asked May 15, 2018 in Electrical Engineering by Shimroz123
2 answers 196 views

What happens to current flow in a capacitive circuit when the DC voltage across the capacitor is approximately equal to the source voltage?

asked May 29, 2018 in Capacitance by Shimroz123
1 answer 13 views

When an alternating potential is applied to a capacitor, the current in the circuit will  1. lead the applied potential 2. lag the applied potential 3. be in phase with the applied potential 4. none 

asked May 13, 2018 in Electrical Engineering by Shimroz123
1 answer 21 views

The purpose of a coupling capacitor in an amplifier is to:  (1) Control the output (2) Provide impedance matching (3) Provide DC isolation between amplifier and load (4) W Increase the bandwidth

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
0 answers 24 views

A separately excited dc motor is required to be controlled, from a 3-phase supply, for its operation in the first quadrant only. The most preferred converter would be  (a) 3-phase fully controlled converter (b) 3-phase fully controlled converter with free wheel diode (c) 3-phase dual converter (d) 3-phase half wave converter 

asked Apr 10, 2018 in Electrical Engineering by Shimroz123

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