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What is the definition of an electrical system?

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 In a free running oscilloscope, the horizontal deflection system is driven by a Ramp waveform

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1 answer 43 views

In a galvanometer, the deflection becomes one half when the galvanometer is shunted by a 20 ohm resistor. The galvanometer resistance is 

asked May 22, 2018 in Electrical Measurements and Instrumentation 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
1 answer 34 views

An 8 pole wound rotor induction motor operating on 60 Hz supply is driven at 1800 r.p.m. by a prime mover in the opposite direction of revolving magnetic field. The frequency of the rotor current is (a) 30 Hz (b) 60 Hz (c) 120 Hz (d) 180 Hz 

asked May 25, 2018 in Induction Machine by Shimroz123
0 answers 14 views

Horizontal deflection plates of CRO are placed generally   (a) Horizontal (b) Vertical (c) Diagonal (d) (a) or (b)  

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

A menu driven operating system is one which allows you to pick up from the menu of choices it displays on the screen. What is the name given to the images which are used in such image oriented menus?  (1) Model (2) Figure (3) Symbol (4) Icon 

asked Apr 10, 2018 in Computer Engineering by Shimroz123
2 answers 41 views

The time base signal in Cathode Ray Oscilloscope (CRO) is  (1) A square wave signal (2) A sawtooth signal (3) A triangular wave signal (4) A sinusoidal signal

asked May 1, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 24 views

A 6 pole 3-phase wound-rotor induction machine is driven by another machine at 1800 rpm. The rotor of the induction machine is connected to a 50Hz system. If the mechanical rotation of the rotor is in the same direction as the rotor winding flux rotation, then frequency of the stator voltage will be

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

Weins bridge is used for measurement of frequency in the applied voltage waveform is measurement of frequency in the applied voltage waveform is   (A)sinusoidal (B) square (C) rectangular (D) triangular

asked May 17, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 53 views

Which of the following operating system is available in free domain?  A) Red Hat Linux B) SUN Solaris C) Windows XP D) Mac OS

asked Apr 9, 2018 in Computer Engineering by Shimroz123
1 answer 112 views

The time/div and voltage/div axes of an oscilloscope have been erased. When a 1 kHz, 5V p-p square wave calibration pulse is connected to channel 1 ofthe scope the waveform observed on the screen is as shown in the upper trace of the figure. An unknown signal is connected to channel 2 (lower trace) ofthe scope. If the time/div and V/div on both channels are the same, the amplitude (pp) and period of the unknown signal are respectively.

asked May 20, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 87 views

A 0-10 A ammeter has a guaranteed accuracy of 1% of full scale deflection, the limiting error while reading 2.5 A will be (a) 1% (b) 2% (c) 4% (d) None of these 

asked May 26, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 20 views

The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100Ohm. This is to have full deflection when 100V is measured. What is the value of series resistor to be used?

asked Mar 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 16 views

 The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100Ohm. If this meter is to have full deflection at 5A, what is the value of the shunt resistance to be used?

asked Mar 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 6 views

If the voltage applied across a capacitor is triangular in waveform, the waveform of the current is (a) Triangular (b) Rectangular (c) Sinusoidal (d) Trapezoidal

asked May 25, 2018 in Electrical Engineering by Shimroz123
1 answer 15 views

Measurement of power and power factor of a 3-phase system by two wattmeter method can be obtained in case of  1. Balanced load and balanced source  2. Balanced source with 3-phase 3-wire unbalanced load  3. Unbalanced source with 3-phase 3-wire balanced load  4. Balanced source with 3-phase 4-wire unbalanced load  5. unbalanced and unbalanced source    (a) 1 only (b) 2, 3 and 5 (c) 1, 2, 3, 4 and 5 (d) 1, 2, 3 and 5 

asked May 13, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 70 views

The power in a 3-phase load is measured by two watt meters. If one watt meter reads zero, then the load power factor is (A) Zero (B) 0.5 (C ) 0.866 (D) unity 

asked Jun 4, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 14 views

If a dynamometer wattmeter is connected in an ac circuit, the power indicated by the wattmeter will be (a) volt-ampere product (b) average power (c) peak power (d) instantaneous power 

asked May 26, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 70 views

. If the peak transmitted power in a radar system is increased by a factor of 16, the maximum range will be increased by a factor of : (A) 2 (B) 4 (C) 8 (D) 16

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
0 answers 21 views

If the antenna diameter in a radar system is increased by a factor of 4, the maximum range will be increased by a factor of  (a) 2 (b) 4 (c) 8 (d) 16

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

A permanent magnet moving coil ammeter has a coil resistance of 99 ohm and Full Scale Deflection (FSD) current of 0.1mA. Shunt resistance is 1 ohm. Current through the meter at 0.5 F.S.D is:

asked May 22, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 20 views

A moving coil instrument has a resistance of 10 W and gives full scale deflection when carrying a current of 50 mA. To measure current upto 100 A, we will have to connect • 10 W resistance in series • 10 W resistance in parallel • 10/1999 W resistance in series • 10/1999 W resistance in parallel

asked May 13, 2018 in Electrical Measurements and 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 10 views

The deflection torque can be produced by:  (1) Gravity control (2) Spring control (3) Airfriction (4) Magnetically

asked Apr 9, 2018 in Electrical Engineering by Shimroz123
1 answer 30 views

In a loss-free R-L-C circuit the transient current is?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 16 views

Dielectric loss in a capacitor is best measured by (A) Wien Bridge (B) Schering Bridge (C) Anderson Bridge (D) Heaviside-Campbell Equal Ratio Bridge

asked Apr 25, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 26 views

For a waveform to be expressed in Fourier series, which of the following conditions must be satisfied? I. Maxwell’s conditions, II. Drichlet conditions, III. Sampling Theorem A) I only B) II only C) II and III only D) I, II and III

asked Jun 17, 2018 in Electrical Engineering by Shimroz123
0 answers 10 views

A power system is represented by its system matrix ZBUS (m × m). Now an element is added in power system network without creating a new node. The dimension of the new impedance matrix will be (a) m × m (b) (m + 1) × (m + 1) (c) (m – 1) × (m – 1) (d) (m + 2) × (m + 2)  

asked May 25, 2018 in Power system by Shimroz123
1 answer 9 views

When running under no-load condition and with over excitation, armature current Ia drawn by a synchronous motor

asked May 15, 2018 in Electrical Machine by Shimroz123
1 answer 17 views

 In the measurement of power of balanced load by two wattmeter method in a 3-phase circuit, The readings of the wattmeters are 4 kW and 2 kW respectively, the later is being taken after reversing the connections of current coil. the power factor and reactive power of the load is A) 0.2 & 6 kVAR B) 0.2 & 6 √3 kVAR C) 0.32 & 2 kVAR D) 0.32 & 2 √3 kVAR

asked Jun 17, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 18 views

While measuring power in a three phase load by two wattmeter method, the reading of two wattmeter are equal and opposite, when (a) load is balanced (b) power factor is unity (c) phase angle is between 60° to 90° (d) the load is purely inductive 

asked May 26, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 21 views

In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be?

asked Mar 21, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 133 views

In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was?

asked Mar 21, 2018 in Electrical Measurements and Instrumentation by Shimroz123

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