Description : When measuring harmonic distortion, you set the signal generator to input a 15-kHz test signal. To what frequency should you set the wave analyzer?
Last Answer : 45 kHz.
Description : Harmonic distortion of the signal is produced in an RC coupled transistor amplifier. The probable component responsible for this distortion is (A) The transistor itself (B) the power supply Vcc (C) the coupling capacitor Cc (D) the biasing resistors
Last Answer : Harmonic distortion of the signal is produced in an RC coupled transistor amplifier. The probable component responsible for this distortion is The transistor itself
Description : Indications of spectrum analyzer is presented by means of
Last Answer : a CRT
Description : In a moving coil ammeter, a ___ is connected in series with the coil to compensate for temperature variations
Last Answer : swamping resistors
Description : What do you call of the frequency-sensitive bridge in which two adjacent arms are resistances and other are RC combinations?
Last Answer : Wein Bridge
Description : When the capacitors of a Wein Bridge are replaced by inductors, the bridge becomes ___
Last Answer : Wein Inductance Bridge
Description : Induction type instruments are mostly used as ___
Last Answer : watt-hour meter
Description : For amplitude measurements, ___ scale is calibrated in either volts per centimeter (V/cm), or millivolts per centimeter (mV/cm)
Last Answer : vertical
Description : When the meter is unsufficiently damped, it is considered as ___
Last Answer : underdamped
Description : ___ ammeter is used to measure high-frequency currents.
Last Answer : thermocouple
Description : A wheatstone bridge is balanced if ___
Last Answer : the ratio of resistors on one side of the bridge equals the ratio of resistors on the other side
Description : In VTVMS, ___ refers to the smallest signal that can be reliably measured
Last Answer : sensitivity
Description : The time interval that a waveform is high (or low) is the ___ of the signal.
Last Answer : pulse width
Description : The time interval between pulses is called ___
Last Answer : pulse delay
Description : A measure of consistency or repeatability of measurements is called. ___
Last Answer : precision
Description : ___ is used for measuring medium Q coils
Last Answer : Maxwell Bridge
Description : Current range extension in moving coil instruments can be achieved by placing a ___ in shunt with the instrument.
Last Answer : low resistance resistor
Description : Error in voltmeter is due to ___
Last Answer : loading
Description : In an oscilloscope, ___ adjusts the brightness of the spot by chaning the current on the control grid.
Last Answer : intensity control
Description : For time measurements, ___ scale of the scope is used.
Last Answer : horizontal
Description : High sensitive DC voltmeter provides accurate reading when measuring ___ circuits.
Last Answer : high resistance
Description : For a dynamometer to be able to measure high current, a ___ should be used.
Last Answer : current transformer
Description : The ___ provides the visual display showing the form of the signal applied as a waveform on the front screen of a cathode ray oscilloscope
Last Answer : CRT
Description : ___ meter is the most sensitive
Last Answer : 1uA
Description : A four-arm bridge. All arms of which are predominantly resistive; used for measuring resistance
Last Answer : Resistance Bridge and Wheatstone Bridge
Description : This refers to a four-arm ac bridge used for measuring inductance against a standard capacitance.
Description : What is a filter used for ?
Last Answer : The half wave and full wave signals are pulsating D . C . voltages. The use of such voltages is limited to charging batteries, running D. C. motors, and a few other applications. What we really ... voltage from a battery. To get a constant voltage from this, we can use a capacitor input filter.
Description : A small swamping resistance is connected in series with operating coil of a moving coil ammter in order to compensate for the effects of ____
Last Answer : temperature variation
Description : Calculate the series resistance needed to convert a D' Arsonval meter with FSD of 100uA and a meter resistance of 1kohm to a voltmeter with 10V FSD.
Last Answer : Rs=10V/100uA - 1kohm = 99kohm
Description : Which distortion is least objectionable in case of audio amplifers? A) Phase distortion B) Frequency distortion C) Harmonic distortion D) Inter modulation distortion.
Last Answer : A) Phase distortion
Description : What number harmonic is the primary harmonic distortion in magnetic tape recorders?
Last Answer : Third-order harmonic.
Description : A recorder’s harmonic-distortion specification reads 2% third harmonic of a 100-kHz signal at 60 ips. What does this mean?
Last Answer : The recorder has 2% third-harmonic distortion of a 100-kHz signal at 60 ips.
Description : What is the effect of following on induction motors: (1) Voltage unbalance (2) Harmonic distortion
Last Answer : i) Effect of voltage unbalance: For three phase motors this leads to unequal currents in the three phase windings that result in unbalance in the fields produced due to which negative phase ... currents thereon). This leads to motor failures, lower life and improper torque speed characteristics.
Description : The second harmonic distortion is defined as the A) Ratio of amplitude of second harmonic component in the output to that of the fundamental frequency B) Harmonic distortion due to only second harmonic component C) Sum of distortion of first and second harmonic components in the output
Last Answer : The second harmonic distortion is defined as the Ratio of amplitude of second harmonic component in the output to that of the fundamental frequency
Description : To get minimum harmonic distortion in the output, a 3-Ф to 3-Ф cyclo-converter requires : (A) 12 SCRs (B) 18 SCRs (C) 36 SCRs (D) 72 SCRs
Last Answer : To get minimum harmonic distortion in the output, a 3-Ф to 3-Ф cyclo-converter requires : 36 SCRs
Last Answer : Harmonic distortion is due to Non-linear behaviour of circuit elements
Description : A wire carrying current `I` has the shape as shown in the adjoining figure. Linear parts of the wire are very long and parallel to X-axis while semici
Last Answer : A wire carrying current `I` has the shape as shown in the adjoining figure. Linear parts of the wire are very ... `B=(mu_(0))/(4pi)I/R(pihati-2hatk)`
Description : Which one the following is a correct statement? (A) The vertical section of the soil extending into the parent material, is called profile (B) The layers of the soil parallel to the earth ... horizons (C) The transitional layer between two adjoining horizons is called boundary (D) All of these
Last Answer : Answer: Option D
Description : What is the mixing process? A. Distortion caused by auroral propagation B. The combination of two signals to produce sum and difference frequencies. C. The elimination of noise in wideband receiver by phase differentiation D. The elimination of noise in a wideband receiver by phase comparison
Last Answer : B. The combination of two signals to produce sum and difference frequencies.
Description : Harmonic suppressor connected to an antenna. A. Low-pass filter B. High-pass filter C. M-derived filter D. Constant-K
Last Answer : A. Low-pass filter
Description : Harmonic suppressor connected to an antenna. A. High pass filter B. Low pass filter C. Tank circuit D. M-derived filter
Last Answer : B. Low pass filter
Description : What is the harmonic filter?
Last Answer : It is being used to supress the input voltage distortion at input side of any electrical equipment. This distortion is created by other electrical loads like motor, drives etc nearby connected with ... for a range of harmonics or specific harmonics like 3rd harmonics 5th harmonics, 7th harmonics.
Description : In a distortion factor meter, the filter at the front end is used suppress (A) odd harmonics (B) even harmonics (C) fundamental component (D) dc component
Last Answer : In a distortion factor meter, the filter at the front end is used suppress fundamental component
Description : What is Zener Diode ? What is a voltage Regulator ?
Last Answer : The breakdown region of a p n diode can be made very sharp and almost vertical Diodes with almost vertical breakdown region are known as Zever Diodes. A Zener diodes operating in the breakdown ... VOLTAGE REGULATOR : The output remains constant despite changes in input voltage due to Zever effect.
Description : What is transistor ? What are the different types ?
Last Answer : A transistor is a three lagged semi conductor device. Basically a transistor means (transfer - resister). Whether the transistor is pnp or npn it resembles two diodes (back to back). The one of the left ... transistor : Emitter - Base - Forward Bias. Collector - Base - Reverse Bias.
Description : What is CB, CE and CC configuration ?
Last Answer : Buffer : A device or a circuit used to isolate two pt'ne circuits or stages. The emitter follows is a example of buffer. Alpha = IC / IE Beta = IC / IB
Description : How will you test a transistor with a multimeter. ?
Last Answer : 1. Emitter +ve of meter and Base -ve output = Low resistance 2. Emitter -ve of meter and base +ve output = High resistance. 3. Collector +ve and Base -ve output = Low. 4. Collector -ve and base +ve output = High. Emitter : Collector = High Resistance. PNP : Opposite Results.
Description : What is a thyristor ? What are its uses ?
Last Answer : A thyristor is a special kind of semi conductor device that uses internal feedback to produce latching action. Use : Used for controlling large amounts of load power in motors, heaters, lighting systems etc ... the latches like a open switch. This latch will always stay in open or close position.