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Y –axis in a CRO normally represents

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Y –axis in a CRO normally represents Voltage

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1 answer 33 views

The Lissajous pattern on the screen of a CRO is an ellipse with major axis in quadrant 2 and quadrant 4. Then the phase difference between two signals Can be :  (A) 270° (B) 210° (C) 180° (D) 300°

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
1 answer 24 views

The two inputs of a CRO are fed with two stationary periodic signals. In the X-Y mode, the screen shows a figure Which changes from ellipse to circle and back to ellipse with its major axis changing orientation slowly and repeatedly. The following inference can be made from this  A) The signals are not sinusoidal ... but not equal C) The signals are sinusoidal with their frequencies very close but not equal D) There is a constant but small phase difference between the signals

asked May 20, 2018 in Oscilloscope by Shimroz123
1 answer 23 views

The Lissajous pattern observed on screen of CRO is a straight line inclined at 45° to x axis. If X–plate input is 2 sin ωt, the Y–plate input is (1) 2 sin ωt (2) 2 sin (ωt + 45°) (3) 2 sin (ωt – 45°) (4) 22 sin ωt + 45°) 

asked May 29, 2018 in Oscilloscope by Shimroz123
1 answer 24 views

Two sinusoidal signals having the same amplitude and frequency are applied to the X and Y inputs of a CRO. The observed Lissajous figure is straight line. The phase shift between the two signals would be (1) Zero (2) 90 degrees (3) Either zero or 180 degrees (4) Either 90 degrees or 270 degrees  

asked May 28, 2018 in Electronics Engineering by Shimroz123
1 answer 29 views

The vertical deflection of an electron beam on the screen of a CRO is measured to be 8 mm. Now, the potential difference between the Y-plates is doubled, and simultaneously the pre-accelerating anode voltage is reduced to half of its previous value. Then, the vertical deflection of the beam on the screen would become (A) 64 mm (B) 32 mm (C) 8 mm (D) 1 mm

asked Apr 28, 2018 in Digital Instrumentation by Shimroz123
1 answer 14 views

In root locus plot, a point on the real axis lies on the locus, if the number of open loop poles plus zeros on real axis to the a) left of the point is odd b) left of the point is even . c) right of the pointis odd d) right of the point is even

asked May 23, 2018 in Control System by Shimroz123
1 answer 27 views

In a synchronous machine, if the field flux axis ahead of the armature field axis in the direction of rotation, the machine is operating as  (1) synchronous motor (2) synchronous generator (3) asynchronous motor (4) asynchronous generator

asked May 1, 2018 in Electrical Machine by Shimroz123
0 answers 107 views

Three materials X, Y and Z having relative permittivity 2.5, 3.0 and 4.0 respectively are used in a single core cable. The materials on inner most and outer most layer respectively should be (a) X and Y (b) Y and Z (c) X and Z (d) Z and X 

asked May 25, 2018 in Physics by Shimroz123
1 answer 10 views

A series inductor is normally added in a thyrister circuit for achieving protection against:

asked May 22, 2018 in Power Electronics by Shimroz123
1 answer 11 views

In a Y-connected circuit, the magnitude of each line current is? A.one-third the phase current B.three times the corresponding phase current C.equal to the corresponding phase current D.zero

asked May 15, 2018 in Basic concepts by Shimroz123
1 answer 11 views

The three non -inductive loads of 5 kW, 3 kW and 2 kW are connected in a star network between R, Y and B phases and neutral. The line voltage is 400 V. The current in the neutral wire is nearly (a) 11 A (b) 14 A (c) 17 A (d) 21 A

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
1 answer 14 views

In a two -channel oscilloscope operating in x -y mode, two in -phase 50 Hz sinusoidal waveforms of equal amplitude are fed to the two channels. What will be the resultant pattern on the screen ? (a) An ellipse (b) A parabola (c) Straight line inclined at 45° with respect to x-axis (d) A circle

asked Apr 23, 2018 in Electrical Engineering by Shimroz123
1 answer 12 views

In a certain three -wire Y -connected generator, the phase voltages are 2 kV. The magnitudes of the line voltages will be: A. 2,000 V B. 6,000 V C. 666 V D. 3,464 V

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
1 answer 65 views

In a Y -connected circuit, between each line -voltage and the nearest phase - voltage, there is a phase -angle of: A. 0° B. 30° C. 60° D. 120°

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
0 answers 16 views

A 3 Phase, 60 Hz generator connected in Y connection, generates a line to line voltage of 23900 V. Calculate the peak line voltage.  (A) 13800 V (B) 33800 V (C) 42300 V (D) 23900 V 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 16 views

In a CRO which of the following is not a part of electron gun: (1) Cathode (2) Grid (3) Accelerating anode (4) X–Y plates 

asked May 29, 2018 in Oscilloscope by Shimroz123
0 answers 10 views

In CRO, Lissajous pattern will be a straight line, if the two signals are of same frequency with a phase difference of (a) 0° (b) 180° (c) 360° (d) All of these 

asked May 25, 2018 in Oscilloscope by Shimroz123
1 answer 17 views

Delay line is essential in a CRO, to ensure that (a) Vertical signal starts after the retrace period of sweep signal (b) The sweep reaches the horizontal plates before the desired signal under consideration (c) Initial part of signal to be observed is not lost (d) All of the above

asked Apr 23, 2018 in Electrical Engineering by Shimroz123
1 answer 63 views

An aquadog is used in a 'CRO' to collect -  a) Secondary emission electrons b) Primary emission electrons c) Both Primary and Secondary emission electrons d) None of the above

asked Apr 10, 2018 in Instrumentation and control by Shimroz123
0 answers 17 views

In a CRO, the quantity to be measured is applied across  (1) focusing electrodes (2) cathode (3) Y-plates (4) X-plates

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
1 answer 74 views

The colour band on the extreme left in general purpose fixed resistors represents: A) Tolerance B) First significant digit C) Wattage Rating D) Voltage Rating

asked Jun 18, 2018 in Electrical Engineering by Shimroz123
0 answers 16 views

Which of the following represents the valid integer number in 'C'?  A) 1500 B)1.1 C) 2-5 D) 0.123

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
0 answers 12 views

On Smith chart, the eccentric circle passing through the prime center represents (in Ohms)  A) R=0 B) R=1 C) Xc=0 D) R=infinity

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 21 views

lf the poles of system are lying on the imaginary axis in s-plane, then the system will be

asked Apr 26, 2018 in Control System by Shimroz123
0 answers 10 views

The S to Z domain transformation in digital filters which transforms imaginary axis to perimeter of unit circle with no aliasing error is  A) Backward difference integration B) Forward difference integration C) Impulse invariant transformation D) Bilinear integration

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 13 views

The gain margin of a system is 0 dB. It represents a   (a) Stable system (b) Unstable system (c) Marginally stable system (d) Conditionally stable system

asked May 13, 2018 in Control System by Shimroz123
0 answers 43 views

A load cell essentially represents a . (A) Thermocouple (B) Thermistor (C) Photo -conductive device (D) Strain gauge

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
1 answer 9 views

 Three different points are shown on a dc load line. The upper point represents the : -  a) minimum current gain b) quiescent point c) saturation point d) cutoff point

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
1 answer 10 views

Which of the following interface represents a collection of associated keys and values?  A) this B) Eventargs C) params D) IDictionary

asked Apr 11, 2018 in Computer Engineering by Shimroz123
0 answers 29 views

In a sample-and-hold circuit, the aperture time is (A) time required following a sample (B) time required for the switch to open (C) transition time interval between sample and hold (D) time from the hold command to the opening of the switch 

asked Jun 4, 2018 in Digital Instrumentation by Shimroz123
1 answer 16 views

In D/A converter, the resolution required is 50mv and the total maximum input is 10v. The number of bits required is   (A) 7 (B) 8 (C) 9 (D) 200

asked May 17, 2018 in Digital Instrumentation by Shimroz123
1 answer 13 views

An analog voltmeter has a sensitivity of 10kΩ/volt. The galvanometer used in constructing the instrument will produce a full scale deflection when the current passed through it is  (a) 10 mA (b) 20 mA (c) 50 mA (d) 100 μA

asked May 15, 2018 in Digital Instrumentation by Shimroz123
1 answer 8 views

In a dual trace oscilloscope, the display appears segmented when  (a) low frequency signals are observed in Alternate mode (b) low frequency signals are observed in Chop mode (c) high frequency signals are observed in Alternate mode (d) high frequency signals are observed in Chop mode

asked May 15, 2018 in Digital Instrumentation by Shimroz123
1 answer 14 views

In a weighted-resistor digital-to-analog converter with 8-bit input, if the resistance corresponding to the MSB is 2K, what will be the resistance corresponding to the LSB?  (a) 250 Ω (d) 512 KΩ (c) 256 KΩ (d) 25.5 Ω

asked May 15, 2018 in Digital Instrumentation by Shimroz123
1 answer 11 views

In a particular circuit connection, AWG 18 wire is selected over AWG 22. The reason is that it is having

asked May 14, 2018 in Digital Instrumentation by Shimroz123
1 answer 21 views

The magnetic field on the axis of a current carrying polygonal coil will have only a horizontal component parallel to the Plane of the coil 

asked May 24, 2018 in Electrical Engineering by Shimroz123
1 answer 18 views

The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is (A) 0.25 pu (B) 0.5 pu (C) 1.0 pu (D) 1.5 pu

asked Apr 28, 2018 in Electrical Machine by Shimroz123
0 answers 17 views

A lag compensator with the zero 10 times farther from the imaginary axis than the compensator pole can improve the steady state error by a factor of  A) 10 B) 5 C) 20 D) 2

asked Apr 9, 2018 in Control System by Shimroz123
1 answer 28 views

Center of gravity of a thin hollow cone lies on the axis at a height of?

asked Mar 22, 2018 in Engineering Mechanics by Shimroz123
1 answer 14 views

Center of gravity of a solid cone lies on the axis at the height?

asked Mar 22, 2018 in Engineering Mechanics by Shimroz123
1 answer 44 views

In 8085 microprocessor, how many T-states does OPCODE FETCH machine cycle normally require (i.e., when HOLD and WAIT signals are NOT forced)? A) 4 to 6 B) 3 to 8 C) 2 to 3 D) 8 to 12 

asked Jun 18, 2018 in Microprocessors and Microcontrollers by Shimroz123
1 answer 27 views

Eddy current damping is normally used in the instruments of (a) Induction type (b) Moving iron type (c) Permanent magnet moving coil type (d) Nothing can be said 

asked May 25, 2018 in Electrical Measurements and Instrumentation 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 11 views

In commercial FM broadcasting, the maximum frequency deviation is normally   (A) 5 KHz (B) 15 KHz (C) 75 KHz (D) 200 KHz

asked May 17, 2018 in Electronics communication by Shimroz123
1 answer 21 views

Surge impedance of overhead transmission line is normally in the order of (a) 1- 5 ohms (c) 300 - 500 ohms (b) 20 - 30 ohms (d) 300000 - 500000 ohms

asked Apr 25, 2018 in Electrical Engineering by Shimroz123

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