Description : inductors have a high impedance when?
Answer :
When you increase the number of turns.
Description : An air core transformer has primary and secondary inductors of 8mH and 10 mH respectively. The mutual inductance is 5mH. The coefficient of coupling is A) 1/8 B) 1/6 C) ¼ D) ½
asked
Apr 9, 2018
by
anonymous
Description : Compared to wire resistance transducers, for temperature measurement, thermistors have advantage of A) Low value temperature coefficient B) High thermal capacity C) High speed of response D) Large size
asked
Apr 9, 2018
by
anonymous
Description : A resistor with the color coded value of 1000 ohms and ± 10% tolerance can have an actual resistance between ________. A. 990 ohm and 1010 ohm B. 900 ohm and 1100 ohm C. 1000 ohm and 1100 ohm D. 900 ohm and 1000 ohm.
Answer :
A resistor with the color coded value of 1000 ohms and ± 10% tolerance can have an actual resistance between 900 ohm and 1100 ohm.
asked
Apr 12, 2018
by
anonymous
Description : State two types of inductors and give their applications.
Answer :
Types of inductors: i) Air cored inductor ii) Iron cored inductor iii) Ferrite cored inductor Air cored inductor: These are used for high frequency application e.g. Radio sets ... radio receiver, wide band pulse transformers, oscillators, signal generators, high frequency amplifiers, etc.
Description : Four inductors each of inductance 1mH are connected in parallel and this combination is connected in series with two inductors each of inductance 1mH. Calculate the equivalent inductance?
Answer :
Four inductors each of inductance 1mH are connected in parallel and this combination is connected in series with two inductors each of inductance 1mH. Calculate the equivalent inductance? 2.25 mH
asked
May 15, 2018
by
anonymous
Description : Shunt Inductors are primarily installed in transmission lines to : (A) Improve Power Factor (B) Improve Stability (C) Reduce Ferranti Effect (D) Improve Voltage Profile
asked
Apr 14, 2018
by
anonymous
Description : Explain the electrical losses of magnetic materials used for the cores of inductors and transformer.
asked
Mar 10, 2018
by
anonymous
Description : If you get an opportunity to serve a central school, but in turn you miss the opportunity to enjoy your home town. How would you accommodate in these conditions? Options: A) You will think yourself lucky enough that you got an opportunity to mix-up with the people of different states B) You will never ... services C) You will feel free as having least family resistance and obligations D) You will have great pride in thinking yourself a powerful link in national integration
Answer :
A) You will think yourself lucky enough that you got an opportunity to mix-up with the people of different states
Description : An element is said to have negative resistance when (a) The element has negative temperature coefficient (b) The current / voltage curve has negative slope (c) The element has negative specific resistance (d) The current / voltage curve has a positive slope
Answer :
An element is said to have negative resistance when The current / voltage curve has negative slope
asked
Apr 25, 2018
by
anonymous
Description : Two materials have resistance temperature coefficients of 0.004 and 0.0002 respectively at a given temperature. In what ratio should the wires made of these materials be connected in series so as to have an overall temperature coefficient of 0.002?
Answer :
Two materials have resistance temperature coefficients of 0.004 and 0.0002 respectively at a given temperature. In 9:10 ratio should the wires made of these materials be connected in series so as to have an overall temperature coefficient of 0.002.
asked
Mar 31, 2018
by
anonymous
Description : Two coils connected in series have resistance of 600 ohm and 300 ohm and temperature coefficients of 0.1% and 0.4% respectively.The resistance of the combination at 50oC will be
Answer :
Two coils connected in series have resistance of 600 ohm and 300 ohm and temperature coefficients of 0.1% and 0.4% respectively.The resistance of the combination at 50oC will be 990 ohm
asked
Mar 31, 2018
by
anonymous
Answer :
The internal resistance of the voltmeter must be very high in order to have Minimum current through the meter.
asked
Mar 28, 2018
by
anonymous
Description : Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as?
Answer :
Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as 2 : 5.
asked
Mar 25, 2018
by
anonymous
Description : The substances which have a large number of free electrons and offer a low resistance are called?
Answer :
The substances which have a large number of free electrons and offer a low resistance are called conductors.
asked
Mar 25, 2018
by
anonymous
Answer :
Yes ammeter has its own resistance Not only ammeter every electrical devices has there own resistance practicaly
asked
Sep 10, 2017
by
anonymous
Description : all resistance in parallel will have same?
Answer :
Voltage drop
Description : all resistance in series will have same?
Answer :
All resistance have same current when they connected in series
Description : Which of the following is a negative-resistance microwave device for oscillator applications? A) IMPATT Diode B) Gunn Diode C) Snap diode D) Schottky Diode
Answer :
Which of the following is a negative-resistance microwave device for oscillator applications? A) IMPATT Diode B) Gunn Diode C) Snap diode D) Schottky Diode
asked
Jun 18, 2018
by
anonymous
Description : The lossless line of characteristics impedance 300 Ohm is terminated in a pure resistance of 200 Ohm. The value of the standing wave ratio is (a) 1.5 (b) 0.67 (c) 1.0 (d) 1.25
Answer :
The lossless line of characteristics impedance 300 Ohm is terminated in a pure resistance of 200 Ohm. The value of the standing wave ratio is 1.5
asked
May 16, 2018
by
anonymous
Description : In an R-2R ladder D/A converter, the input resistance is 1. Not same for all digital inputs 2. R for each input 3. 2R for each input 4. 3R for each input
Answer :
In an R-2R ladder D/A converter, the input resistance is 3R for each input
asked
May 13, 2018
by
anonymous
Description : Ratio of the rotor reactance X to the rotor resistance R for a two-phase servo motor (A) is equal to that of a normal induction motor (B) is less than that of a normal induction motor (C) is greater than that of a normal induction motor (D) may be less or greater than that of a normal induction motor
Answer :
C
asked
Apr 28, 2018
by
anonymous
Description : Which diode exhibits negative resistance characteristic? (A) LED (B) Zener (C) Tunnel diode (D) PN diode
Answer :
Which diode exhibits negative resistance characteristic? (A) LED (B) Zener (C) Tunnel diode (D) PN diode
asked
Apr 28, 2018
by
anonymous
Description : Twelve 1 ohm resistances are used as edge to form a cube. The resistance between two diagonally opposite corners of the cube is: (1) 5/6 ohm (2) 1 ohm (3) 6/5 ohm (4) 3/2 ohm
Answer :
Twelve 1 ohm resistances are used as edge to form a cube. The resistance between two diagonally opposite corners of the cube is: 5/6 ohm.
asked
Apr 9, 2018
by
anonymous
Description : How does the resistance of a circular conductor behave, if the diameter of the conductor is halved? A) Remains unchanged B) Doubles C) Becomes 4 times D) Becomes one -fourth
asked
Apr 9, 2018
by
anonymous
Description : Which of the following amplifier configurations has the lowest input resistance? A) Common Emitter B) Common Base C) Common Collector D) Emitter Follower
asked
Apr 9, 2018
by
anonymous
Description : An amplifier which has almost same gain and input resistance of a CE amplifier but of higher bandwidth is A) Cascode amplifier B) Cascade amplifier C) Darligton amplfier D) CC amplifier
asked
Apr 9, 2018
by
anonymous
Description : For a CE amplifier, operating current is 1mA, load resistance is 5 kOhm.The forward bias capacitance is 50 nF and reverse bias capacitance is 10 nF. Total input capacitance in nF is around A) 40 B) 60 C) 500 D) 2000
asked
Apr 9, 2018
by
anonymous
Description : The total output offset voltage for a noninverting amplifier with input resistance 1 kOhm , feedback resistance 10 k Ohm, input offset voltage 10 mV and input bias current 100 nA is, about A) 25 mV B) 55 mV C) 110 mV D) 220 mV
asked
Apr 5, 2018
by
anonymous
Description : The hot resistance of a bulb’s filament is higher than its cold resistance because the temperature coefficient of the filament is:
Answer :
positive
asked
Mar 28, 2018
by
anonymous
Answer :
The resistance of a conductor will be least For dc.
asked
Mar 28, 2018
by
anonymous
Description : The current in a circuit with resistance in 6 amp. When an additional resistance of 4 ohms is inserted the current drops to 4 amp. The original resistance in ohms is
Answer :
The current in a circuit with resistance in 6 amp. When an additional resistance of 4 ohms is inserted the current drops to 4 amp. The original resistance in ohms is 8.
asked
Mar 28, 2018
by
anonymous
Description : What should be the ideal resistance of ammeter ?
Answer :
Ideal resistance of ammeter should be zero.
asked
Mar 8, 2018
by
anonymous
Description : A galvanometer can be converted to a voltmeter by connecting (1) a high resistance in parallel (2) a high resistance in series (3) a low resistance in series (4) a low resistance in parallel
Answer :
a high resistance in series
Description : A galvanometer can be converted into a voltmeter by connecting with it a (1) high resistance in parallel (2) low resistance on parallel (3) high resistance on series (4) low resistance in series
Answer :
high resistance on series
asked
Jun 30, 2019
by
anonymous
Description : Which method can be used for absolute measurement of resistance? A. Ohm's law method B. Wheatstone bridge method C. Both A & B D. None of these.
Answer :
Wheatstone bridge method can be used for absolute measurement of resistance.
asked
Apr 12, 2018
by
anonymous
Description : The temperature of resistance furnaces can be controlled by changing the: (A) applied voltage (B) number of heating elements (C) circuit configuration (D) all of the above
Answer :
The temperature of resistance furnaces can be controlled by changing the: (A) applied voltage (B) number of heating elements (C) circuit configuration (D) all of the above
asked
Apr 11, 2018
by
anonymous
Answer :
The resistance can be measured most accurately by bridge method.
asked
Mar 28, 2018
by
anonymous
Answer :
A moving-coil permanent-magnet instrument can be used as ammeter by using a low resistance shunt.
asked
Mar 21, 2018
by
anonymous
Answer :
Yes we can use potentiometer for measuring resistance.
asked
Sep 30, 2017
by
anonymous
Answer :
Voltmeter is used to measure voltage in a circuit.Ohmmeter is used to measure the resistance of a component in a circuit.
asked
Sep 10, 2017
by
anonymous
Description : Which of the following notations have two repetitions of zero ? (P) 1’s complement with radix of number being 2 (Q) 7’s complement with radix of number being 8. (R) 9’s complement with radix of number being 10. (S) 10’s complement with radix of number being 10 Select the correct answer using the codes given below: (a) P,Q and S (b) P and R (c) Q, R and S (d) P,Q and R
Answer :
Which of the following notations have two repetitions of zero ? (P) 1's complement with radix of number being 2 (Q) 7's complement with radix of number being 8. (R) 9's complement with radix of number being 10. (S) 10 ... : (a) P,Q and S (b) P and R (c) Q, R and S (d) P,Q and R
asked
May 13, 2018
by
anonymous
Description : The Semiconductor strain gauges typically have much higher gauge factors than those of metallic strain gauges, primarily due to : (A) higher temperature sensitivity (B) higher Poisson’s ratio (C) higher piezoresitive coefficient (D) higher magnetostrictive coefficient
Answer :
The Semiconductor strain gauges typically have much higher gauge factors than those of metallic strain gauges, primarily due to : higher piezoresitive coefficient
asked
Apr 26, 2018
by
anonymous
Description : What type of temperature coefficient do thermistors have? (1) Positive (2) Negative (3) Either positive or negative (4) None of these
Answer :
Either positive or negative type of temperature coefficient do thermistors have.
asked
Apr 9, 2018
by
anonymous
Description : Microcontrollers often have A) CPUs B) RAM C) ROM D) all of the above
Answer :
Microcontrollers often have CPUs, RAM, ROM.
asked
Apr 9, 2018
by
anonymous
Description : Two coils in differential connection have self-inductance of 2 mH and 4 mH and a mutual inductance of 0.15 mH. The equivalent inductance of the combination is
Answer :
Two coils in differential connection have self-inductance of 2 mH and 4 mH and a mutual inductance of 0.15 mH. The equivalent inductance of the combination is 5.7 mH.
asked
Mar 31, 2018
by
anonymous
Answer :
Binary means Two Binary numbers have a base of 2
asked
Mar 29, 2018
by
anonymous
Answer :
When a transistor is connected in common emitter mode, it with have medium input resistance and high output resistance.
asked
Mar 29, 2018
by
anonymous