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The Lissajous pattern obtained on a CRO in used to determine: Phase shift and frequency

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0 answers 25 views

Lissajous pattern obtained on a CRO screen is a circle. Frequency of two signals are   (a) Equal (b) Unequal (c) Zero (d) Infinity 

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
1 answer 21 views

Consider the following statements with regard to Lissajous pattern on a CRO :  1. It is a stationary pattern on the CRO.  2. It is used for precise measurement of frequency of a voltage signal.  3. The ratio between frequencies of vertical and longitudinal voltage signals should be an integer to have a steady Lissajous pattern.  Which of the above statements is/are correct ?  (a) 1 only (b) 2 only (c) 3 only (d) 1, 2 and 3

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
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 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
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
0 answers 59 views

A Lissajous pattern on an oscilloscope has 5 horizontal tangencies and 2 vertical tangencies. The frequency of the horizontal input is 1000 Hz. What is the frequency of the vertical input?  (A) 400 Hz (B) 5000 Hz (C) 4000 Hz (D) 2500 Hz

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
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Which test is used to determine the magnetizing impedance of a transformer?  (A) Short-circuit test (B) Impulse test (C) Load test (D) Open- circuit test

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
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A circular radiation pattern is obtained using  A) Travelling wave antenna (TWA) B) Rhombic antenna C) Yagi antenna D) Turnstile antenna

asked Apr 9, 2018 in Electronics 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
1 answer 24 views

Which of the following measure(s) is/are used to determine the quality of a printer ___.  a) Dots printed in a minute b) Dots per Inch c) Dot-Per-Square-Inch d) All of the Above

asked May 13, 2018 in Computer Engineering by Shimroz123
0 answers 90 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
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
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 21 views

A no-load test is performed on a transformer to determine?

asked Mar 19, 2018 in Transformer by Shimroz123
1 answer 28 views

CRO is used to measure ________. A. Amplitude B. Phase difference C. Frequency D. All of these 

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
1 answer 8 views

CRO is used to _________. A. produce frequency B. measure frequency C. produce phase difference D. none of these 

asked Apr 12, 2018 in Electrical Engineering by Shimroz123
1 answer 18 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 7 views

The phase angle corresponding to λ/4 in a standing– wave pattern is: (1) 30° (2) 90° (3) 135° (4) 180°

asked May 28, 2018 in Electronics Engineering by Shimroz123
1 answer 36 views

The function of input attenuators in measuring instruments, like VTVM and CRO, is to (a) Increase the input impedance (b) Attenuate the frequency range (c) Attenuate the input signal amplitude without altering the frequency contents (d) Attenuate the input impedance

asked Apr 23, 2018 in Electrical Engineering by Shimroz123
1 answer 16 views

Why is the radiation pattern indicated on a polar graph ? (A) Easy to indicate the bandwidth (B) Easy to get the parameters of the antenna (C) Easy to understand the directionality of the antenna (D) Easy to find impedance

asked May 12, 2018 in Electronics Engineering by Shimroz123
1 answer 26 views

Sumpner's test is conducted on transformer to determine?

asked Mar 19, 2018 in Transformer by Shimroz123
0 answers 50 views

In applying superposition theorem, to determine branch currents and voltages   (a) all current and voltage sources are shorted. (b) only current sources are open circuited. (c) only voltage sources are shorted. (d) voltage sources are shorted and current sources are open circuited. 

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
0 answers 26 views

A CRO cannot be used for direct measurement of   (a) Voltage (b) Current (c) Frequency (d) Power

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
1 answer 27 views

Dry etching refers to removal of material, typically a masked pattern of semiconductor material, by exposing material to a bombardment of ions which contain (a) Plasma of nitrogen, chlorine and boron trichloride (b) Plasma of sodium, chlorine and boron trichloride (c) Plasma of nitrogen, phosphorous and boron trichloride (d) Plasma of nitrogen, chlorine and boron trioxide

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

Slip test is performed to determine :  (A) Slip in an induction motor  (B) Xd and Xq in a salient pole alternator  (C) Synchronous impedance in an alternator  (D) Positive and negative sequence impedances of an alternator

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 58 views

Starting torque can be obtained in the case of a single phase induction motor with identical main and auxiliary windings by connecting:  (1) A capacitor across the mains (2) A capacitor in series with the machine (3) A capacitor is series with the auxiliary winding (4) Equal value capacitors in series with the main and the auxiliary windings

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
1 answer 71 views

The size of a conductor used in power cables depends on the:  (A) operating voltage  (C) current to be carried (B) power factor (D) type of insulation used

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
0 answers 75 views

Determine the transformer tap ratios when the receiving end voltage is equal to the sending end voltage, the high voltage line operates at 220 kV and transmit 80 MW at 0.8 pf and the impedance of the line is (40+j140)ohm. Assume tstr=1.0  (A) 0.8 (B) 0.9 (C) 0.7 (D) 0.6 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
0 answers 42 views

Lissajons figures asppear on CRO screen (a) when two sine waves of same frequency input signals. (b) depend on amplitude of two input signals. (c) depend on phase of two input signals. (d) used to measure harmonics.

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

How many bits Internet address is assigned to each host on a TCP/IP Internet which is used in all communications with host?  A) 16 bits B) 32 bits C) 48 bits D) 64 bits

asked Apr 11, 2018 in Computer Engineering by Shimroz123
1 answer 24 views

To determine the polarity of the voltage drop across a resistor, it is necessary to know?

asked Mar 25, 2018 in Network Analysis by Shimroz123
0 answers 21 views

In a static over-current relay, inverse time characteristics are obtained by   (a) A differentiating circuit (b) An integrating circuit (c) A transistor amplifier (d) A transistor switch

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
1 answer 9 views

Consider the following statements with regard to induction type wattmeter :  1. Can be used on both ac and dc systems.  2. Power consumption is relatively low.  3. It is accurate only at stated frequency and temperature.  Which of the above statements is/are correct ?  (a) 1 only (b) 2 only (c) 3 only (d) 1, 2 and 3

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
1 answer 17 views

The short length of the conductor used to connect the line conductor on one side of the terminal pole to the line conductor on the other side of the pole is known as : a)jumper c) guard b) petticoat d) guy

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
1 answer 21 views

 The charge on an electron is known to be 1.6 x 10-19 coulomb. In a circuit the current flowing is 1 A. How many electrons will be flowing through the circuit in a second? 

asked Mar 31, 2018 in Electrical Engineering by Shimroz123
0 answers 53 views

Consider a single stage tuned amplifier having 3dB bandwidth of lOOKHz. Determine the bandwidth if two such single stage tuned amplifiers are cascaded :  A) lOOKHz B) lOKHz C) 41.4KHz D) 64.3KHZ

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
0 answers 16 views

A pair of synchronous machines on the same shaft may be used to generate power at 60 Hz from given source of power at 50 Hz. Using minimum number of poles for both the machines, the synchronous speed will be (a) 500 r.p.m. (b) 600 r.p.m. (c) 1000 r.p.m. (d) 1200 r.p.m. 

asked May 25, 2018 in Synchronous machine by Shimroz123
0 answers 26 views

An audit trail  (1) is used to make backup copies (2) is the recorded history of operations performed on a file (3) can be used to restore lost information (4) none of these

asked Apr 10, 2018 in Computer Engineering by Shimroz123
1 answer 27 views

Two wattmeters are used to measure the power in a 3 -phase balanced system. What is the power factor of the load when one wattmeter reads twice the other ?  (a) 0 (b) 0.5 (c) 0.866 (d) 1

asked Apr 23, 2018 in Electrical Engineering by Zeeshan
1 answer 5 views

The ‘sheath’ in a cable is used to:  (A) provide strength (B) provide proper in ui ,tion (C) prevent moisture ro entering the cable (D) avoid chances of rust on strands 

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
1 answer 83 views

The diameter of conductor used in LT 660 V grade power cables depends on

asked May 15, 2018 in Electrical Engineering 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 23 views

A reading of 120 is obtained when a standard inductor was connected in the circuit of a Q-meter and the variable capacitor is adjusted to a value of 300 pF. A lossless capacitor of unknown value Cx is then connected in parallel with the variable capacitor and the same reading was obtained when the variable capacitor is readjusted to a value of 200 pF. The value of Cx in pF is  A) 100 B) 200 C) 300 D) 500

asked May 20, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 17 views

Which of the following permutation can be obtained in the output (in the same order) using a stack assuming that the input is the sequence 1, 2, 3, 4, 5 in that order?  (1) 3, 4, 5, 1, 2 (2) 3, 4, 5, 2, 1 (3) 1, 5, 2, 3, 4 (4) 5, 4, 3, 1, 2 

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

If a 220 V heater is used on 110 V supply, the heat produced by it will be nearly (a) one half (b) twice (c) one-fourth (d) four times 

asked May 25, 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

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