# For given applied voltage, with the increase in frequency of the applied voltage?

For given applied voltage, with the increase in frequency of the applied voltage?

For given applied voltage, with the increase in frequency of the applied voltage eddy current loss will remain unchanged.

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Answer : This is because current flows from high potential to low potential to bring the two diffrent potential to unity , thus  a reduced potential (voltage)

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Description : What happens to the voltage in the secondary when the frequency of the supply in the primary is decreased? A) It increases B) It decreases C) It remains the same D) Cannot say unless the actual percentage increase in the frequency is known

Answer : What happens to the voltage in the secondary when the frequency of the supply in the primary is decreased? A) It increases B) It decreases C) It remains the same D) Cannot say unless the actual percentage increase in the frequency is known

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Answer : Sinusoids find amplitude, period, frequency, voltage (Problem 1)

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Answer : The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque Increases

Description : Reduction in core losses and increase in permeability are obtained with transformer employing?

Answer : Reduction in core losses and increase in permeability are obtained with transformer employing core built-up of laminations of cold rolled grain oriented steel.

Description : In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?

Answer : In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are hysteresis and eddy current losses.

Answer :  The size of a synchronous motor decreases with the increase in flux density.

Description : The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as?

Description : In a series R-C circuit, with the increase in frequency, current (A) Reduces (B) Increases (C) Does not change (D) Becomes zero

Answer : In a series R-C circuit, with the increase in frequency, current Increases

Description : What will happen if you increase the current in the motor?

Answer : Increasing current means increasing frequency of the motor because current is directly proportional to rotations of the motor rotor

Description : What are three ways you can increase the strength of an electromagnet?

Description : How can we increase the induced current?

Answer : Induced  current  can  be  increased by  reducing  no  of   windings  on  the  secondary  part   compared   to   primary.

Description : The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?

Answer : The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as pull-in torque.

Answer : If the supply frequency to the transformer is increased, the iron loss will increase.

Description : Consider the sinusoidal voltage waveforms, v1(t) and v2(t), as shown  (i) State the frequency and amplitude for both the voltage waveforms. (ii) Calculate the rms value of v1(t) and v2(t), ... time domain. (vii) Calculate the instantaneous value of v2(t) at t = 38 ms.

Description : A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC voltage drops entirely across the

Answer : A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC voltage drops entirely across the C only

Description : When a voltage of one volt is applied, a circuit allows one micro ampere current to flow through it. The conductance of the circuit is?

Answer : If v = 1 volt and i = 1 micro amp, i= 10^(-6)   So R = V/I,  R= 1/10^(-6) , R= 10^6  And now Conductance G = 1/R  So G = 10^(-6) mho..... Answer

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Answer : The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.

Description : Negative voltage regulation is indicative that the load is?

Answer : Negative voltage regulation is indicative that the load is capacitive.

Description : A good voltage regulation of a transformer means?

Answer : A good voltage regulation of a transformer means output voltage fluctuation from no load to full load is least.

Description : The voltage transformation ratio of a transformer is equal to the ratio of?

Answer : The voltage transformation ratio of a transformer is equal to the ratio of secondary induced e.m.f. to primary induced e.m.f.

Description : If a transformer is switched on to a voltage more than the rated voltage?

Answer : If a transformer is switched on to a voltage more than the rated voltage its power factor will deteriorate.

Description : Minimum voltage regulation occurs when the power factor of the load is?

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Description : What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage:  (A) Eddy Current and Hysteresis losses will be ... Current will be too much high  (C) Transformer may start to smoke and burn  (D) No effect

Answer : What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage:  (A) Eddy Current and Hysteresis losses will be ... will be too much high  (C) Transformer may start to smoke and burn  (D) No effect

Description : For measurement of radio frequency ac signals __________ type meter is used

Answer : For measurement of radio frequency ac signals thermo-couple type meter is used

Description : For a 500 Hz frequency excitation, a 50 km long power line will be modeled as

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Description : For a frequency of 200 Hz, the time period will be?

Answer : For a frequency of 200 Hz, the time period will be 0.005 s.

Answer : For measuring current at high frequency we should use thermocouple instrument.

Description : Which capacitor is used for high frequency?

Description : Why the cutoff frequency is taken for 3db?

Answer : MOSFET provides better efficiency at high frequency and its high speed switching losses are less hence MOSFET is used for high frequency.

Description : List two types of oscillator, which generates frequency in RF range.

Answer : Types of Oscillators generating frequencies in RF range: i) Hartley Oscillator ii) Colpitt’s Oscillator iii) Clapp Oscillator

Description : In a series RLC high Q circuit, the current peaks at a frequency  (1) equal to the resonant frequency (2) greater than the resonant frequency (3) less than the resonant frequency (4) equal to half the resonant frequency

Answer : In a series RLC high Q circuit, the current peaks at a frequency equal to the resonant frequency

Description : In a self-controlled synchronous motor fed from a variable frequency inverter  (1) the rotor poles invariably have damper windings  (2) there are stability problems  (3) the speed of the rotor decides stator frequency  (4) the frequency of the stator decides the rotor speed

Answer : In a self-controlled synchronous motor fed from a variable frequency inverter the frequency of the stator decides the rotor speed

Description : The time period of third harmonic of power supply frequency, in milliseconds, is (A) 20 (B) 3.33 (C) 6.66 (D) 60

Answer : The time period of third harmonic of power supply frequency, in milliseconds, is 6.66

Description : In a 741 Op-Amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to the (A) applied load (B) internal compensation (C) impedance of the source (D) power dissipation in the chip

Answer : In a 741 Op-Amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to the internal compensation

Description : In a series L-C circuit at the resonant frequency the?

Answer : In a series L-C circuit at the resonant frequency the current is maximum.

Description : In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of?

Answer : In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of L or C.

Answer : In a Weston frequency meter, the magnetic axes of the two fixed coils are perpendicular.

Answer : In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of 0.5 Hz.

Description : Principal of digital frequency meter.

Answer : The basic block diagram of basic digital frequency meter (DFM) is shown in above figure. The signal whose frequency we have to be measured is first to be amplified through amplifier. The output of amplifier ... = Number of counts. t = Time interval between start and stop condition of the gate.

Description : Define the following terms: 1) Virtual height 2) Actual height 3) Critical frequency. 4) Maximum usable frequency.

Answer : 1) Virtual height:- The incident and refracted rays follow paths that are exactly the same as they have been if reflection had taken place from a surface located at a greater height, called ... angle of incidence is other than the normal is known as maximum unstable frequency. MUF= fc secθ

Description : Draw the diagram and explain the working of ferrodynamic type frequency meter.

Answer : Ferrodynamic type frequency meter: (Electrical resonance type frequency meter): It consists of a fixed coil. The supply whose frequency is to be measured is connected across it. This coil ... so selected that the moving coil takes up a convenient position when frequency is of normal value.

Description : List the different types of frequency meters.

Answer : Different types of frequency meters  1. Reed type [Mechanical type] 2. Ferro-dynamic type [Resonances type] 3. Weston type 4. Ratio-meter type 5. Saturable core type 6. Digital type

Description : Explain working of Weston type frequency meter.

Answer : Weston Type Frequency Meter: There are two fixed coils marked as A and B. Each coil divided into two equal parts and are fixed such that their magnetic axis are perpendicular to each ... leading to deflections in either direction depending on the currents there in, due to changed impedances.

Description : State the application of phase sequence indicator; clip on ammeter, frequency meter & P.F. meter.

Answer : Phase Sequence Indicator:  1. For finding correct phase sequence of supply  2. For obtaining exact instant of parallel operation of alternators.  3. For obtaining reversal of rotation ...  4. In electroplating industries   5. In various processes industries for measuring power factor

Description : State the need of multistage amplifier. Draw frequency response of R-C coupled amplifier.

Answer : The need of multistage amplifier The voltage (or power) gain, obtained from a single stage small signal amplifier, is limited. Therefore, it is not sufficient for all practical applications. Therefore, in ... to use a MULTISTAGE AMPLIFIER .  Frequency response of R-C coupled amplifier.

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