Description : A 10A DC Ammeter has a resistance of 0.1 Ω is to be extended to 50 A, the required shunt wire is A) Manganin wire of 20 m Ω B) Constantan wire of 20 m Ω C) Manganin wire of 25 m Ω D) Constantan wire of 25 m Ω
Last Answer : A 10A DC Ammeter has a resistance of 0.1 Ω is to be extended to 50 A, the required shunt wire is Manganin wire of 25 m Ω
Description : A galvanometer of 65 Ω resistance gives full scale deflection with 4 mA current. In order to convert it into ammeter, the range of 10 A is connected with it, the shunt resistance should be a) 0.1 Ω b) 0.2 Ω c) 0.06 Ω d) 0.03 Ω
Last Answer : d) 0.03 Ω
Description : A voltmeter of range 2 V and resistance `300 Omega` cannot be converted into ammeter of range
Last Answer : A voltmeter of range 2 V and resistance `300 Omega` cannot be converted into ammeter of range A. `1 A` B. `1 mA` C. `100 mA` D. `10 mA`
Description : Sketch the circuit of basic DC ammeter , derive equation for shunt resistance.
Last Answer : Derivation The basic movement of dc ammeter circuit consists of D' Arsonval galvanometer. When large current is to be measured then some extra modification is required. For measurement of large current by using ... same. Vsh =Vm m IshRsh=ImRm Rsh=ImRm/Ish Rsh=ImRm/(I-Im)
Description : When a resistor is used as a shunt and is connected in parallel with a meter movement coil, it will provide _____________. A. a measurement of circuit resistance B. an increased accuracy of approximately 1.5 percent C. an extended meter range D. none of the above
Last Answer : Answer: C
Description : In the schematic diagram of the DC compound generator shown in the illustration, the positive ammeter reading is 500 amps and the negative ammeter reading is 475 amps. What is the current flow through the neutral bus? EL-0037 A. 0 amp B. 12.5 amp C. 25 amp D. 975 amp
Description : A `1 Omega` resistance in series with an ammeter is balanced by 25 cm of potentiometer by 50 cm. The ammeter shows a reding of `1.5 A`. Then, the erro
Last Answer : A `1 Omega` resistance in series with an ammeter is balanced by 25 cm of potentiometer by 50 cm. The ammeter shows a ... B. 3A C. `1.3 A` D. `0.3A`
Description : In order to increase its range of measurement, a resistance would be placed in series with which of the following instruments? A. DC voltmeter B. DC ammeter C. frequency meter D. power factor meter
Last Answer : Answer: A
Description : When a resistance of 100`Omega` is connected in series with a galvanometer of resistance R, then its range is V. To double its range, a resistance of
Last Answer : When a resistance of 100`Omega` is connected in series with a galvanometer of resistance R, then its range ... 800`Omega` C. 900`Omega` D. 100`Omega`
Description : The shunt of a DC ammeter should be connected in __________. A. series with the load and in parallel with the meter movement B. parallel with the load and in series with the meter movement C. ... and in parallel with the meter movement D. series with the load and in series with the meter movement
Description : Draw and state how Aryton shunt type DC ammeter . State advantage of using Aryton shunt.
Last Answer : OR The Aryton shunt eliminates the possibility of having the meter in the circuit without a shunt. This advantage is gained at the price of slightly higher overall Aryton shunt ammeter. In this ... between shunts. 3. Another advantage is that it may be used as a wide range ammeter.
Description : A moving coil galvanometer is converted into an ammeter reads upto `0.03 A` by connecting a shunt of resistance `4r` across it and ammeter reads up `0
Last Answer : A moving coil galvanometer is converted into an ammeter reads upto `0.03 A` by connecting a shunt of resistance `4r` ... `0.02A` C. `0.03A` D. `0.04A`
Description : In the circuit shown the cells `A` and `B` have negligible resistance. For `V_(A) = 12 V, R_(1) = 500 Omega` and `R = 100 Omega`, the galvanometer `(G
Last Answer : In the circuit shown the cells `A` and `B` have negligible resistance. For `V_(A) = 12 V, R_(1) = 500 Omega` and ` ... A. 4 V B. 2 V C. 12 V D. 6 V
Description : How range of A.C. ammeter & A.C. voltmeter is extended? Draw suitable diagram.
Last Answer : Extension of A.C. Ammeter Range: The range of a.c. ammeter can be extended by using CT, the arrangement is shown in figure. The CT is current transformer having less number of primary turns carrying high ... high magnitude of source voltage. In this way range of a.c. voltmeter can be extended.
Description : A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) of necessary shunt will be
Last Answer : A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) ... 001` B. `0.01` C. 1 D. `0.05`
Description : An ammeter has a current change of 0-5A and its internal resistance is 0.2 ohm. In order to Change the range to 0-25 A, wear need to add a resistance of A) 0.8 ohm in series with the meter B) ... series with the meter C) 0.04 ohm in parallel with the meter D) 0.05 ohm in parallel with the meter
Last Answer : An ammeter has a current change of 0—5A and its internal resistance is 0.2 ohm. In order to Change the range to 0-25 A, wear need to add a resistance of 0.05 ohm in parallel with the meter
Last Answer : 3.33 nano ohms.
Description : An ammeter has a full-scale deflection current of 100mA. If the same ammeter is used to measure a full-scale current of 1.0ampere, what is the value of the shunt resistor in ohms if the voltage across the meter is 9.0 volts?
Last Answer : 10 ohms
Description : Assertion : Resistance of an ammeter is less than the resistance of a milliammeter. Reason : Value of shunt required in case of ammeter is more than a
Last Answer : Assertion : Resistance of an ammeter is less than the resistance of a milliammeter. Reason : Value of ... . If Assertion is false but Reason is true.
Description : Calculate the shunt resistance needed to increase the FSD of an ammeter 5 times if the meter resistance is 1kohm
Last Answer : 250ohms
Description : A shunt-fed quarter-wavelength Marconi antenna A. has maximum RF impedance to ground at its feedpoint B. has a current null at its feedpoint C. has a zero DC resistance to ground D. has zero RF resistance to ground
Last Answer : C. has a zero DC resistance to ground
Description : As compared to shunt and compound DC motors, the series DC motor will have the highest torque because of its comparatively ____________ at the start. (A) Lower armature resistance. (B) Stronger series field. (C) Fewer series turns. (D) Larger armature current.
Last Answer : (D) Larger armature current.
Description : A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is
Last Answer : A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is 36 Ohm
Description : To limit the current flow through a DC voltmeter to as low a value as possible, the moving coil circuit is provided with a/an _____________. A. high series resistance B. high parallel resistance C. series inductor D. external shunt
Description : Decreasing the value of the shunt resistor of an ammeter, it current measuring capability
Last Answer : increases
Description : A galvanometer having resistance of `50 Omega` requires a current of `100 Omega A` to given full scale deflection. How much resistance is required to
Last Answer : A galvanometer having resistance of `50 Omega` requires a current of `100 Omega A` to given full scale ... in series D. `10^(5)Omega` in parallel
Description : A galvanometer has a coil of resistance `100 Omega` and gives a full-scale deflection for `30 mA` current. If it is to work as a voltmeter of `30 V` r
Last Answer : A galvanometer has a coil of resistance `100 Omega` and gives a full-scale deflection for `30 mA` current. ... Omega` C. `1000 Omega` D. `1800 Omega`
Description : A 4 pole lap wound dc shunt motor rotates at the speed of 1500 rpm, has a flux of 0.4 mWb and the total number of conductors are 1000. What is the value of emf? (A) 100 Volts. (B) 0.1 Volts. (C) 1 Volts. (D) 10 Volts.
Last Answer : Ans: D Given N = 1500 rpm, Φ = 0.4 mWb, Z = 1000, P = 4, & A= 4 Therefore, Eb = NΦPZ / 60 A = 1500 x 0.4 x 4 x 1000 x 10^-3 / 60 x 4 = 60/6 = 10 volts
Description : An internal resistance is placed in series with the meter movement of which of the following instruments? A. AC ammeter B. DC ammeter C. DC voltmeter D. Frequency meter
Description : The range of voltmeter is 10 V and its internal resistance is `50 Omega`. To convert it to voltmeter of range 15 V, how much resistance is to be added
Last Answer : The range of voltmeter is 10 V and its internal resistance is `50 Omega`. To convert it to ... in parallel D. Add `125 Omega` resistor in series
Description : The resistance of a coil used in a platinum-resistance thermometer at `0^(@)C` is `3.00 Omega` and at `100^(@)C` is `3.75 Omega`. Its resistance at an
Last Answer : The resistance of a coil used in a platinum-resistance thermometer at `0^(@)C` is `3.00 Omega ... as `3.15 Omega`. Calculate the unknown temperature.
Description : In glycinuria daily urinary excretion of glycine ranges from (A) 100–200 mg (B) 300–500 mg (C) 600–1000 mg (D) 1100–1400 mg
Last Answer : Answer : C
Description : Value of Prandtl number for water ranges from (A) 1 to 2 (B) 5 to 10 (C) 100 to 500 (D) 1000 to 2000
Last Answer : (B) 5 to 10
Description : Human ear is most sensitive to noise in the following frequency ranges: (A) 1-2 KHz (B) 100-500 Hz (C) 10-12 KHz (D) 13-16 KHz
Last Answer : (A) 1-2 KHz
Description : Which of the listed electrical devices is represented by the symbol shown in the illustration? EL-0055 A. Fixed resistance resistor B. Coil with magnetic core C. DC motor or generator shunt field D. Transformer
Last Answer : Answer: D
Description : Armature shunting method of speed control of dc shunt motor is preferred over annature resistance method due to: (1) Better speed regulation (2) Less loss in external resistance (3) Simplicity in control circuit (4) Reduced cost of controller
Last Answer : Armature shunting method of speed control of dc shunt motor is preferred over annature resistance method due to: Better speed regulation.
Description : What is used to allow an ammeter to measure different ranges?
Last Answer : Shunt resistors (internal or external).
Description : A permanent magnet moving coil instrument gives full scale deflection of 25mA when a voltage of 75mV is applied across it. Calculate: (i) Resistance of shunt required for full scale deflection of 150 A. (ii) Series resistance for full scale deflection of 500 V.
Last Answer : Answer :
Description : In the given circuit diagram if each resistance is of `10 Omega`, then the current in arm AD will be
Last Answer : In the given circuit diagram if each resistance is of `10 Omega`, then the current in arm AD will be A. `(i)/(5)` ... )` C. `(3i)/(5)` D. `(4i)/(5)`
Description : The equation, X = A cos(wt + f) (read: X equals A times the cosine of omega t + phi (fee)), can represent an expression for: w) accelerating due to gravity x) uniform straight line motion y) dc current z) a simple harmonic oscillator
Last Answer : ANSWER: Z -- A SIMPLE HARMONIC OSCILLATOR
Description : What is ammeter shunt ?
Last Answer : A small amount of radial coupling in parallel with the coil to increase the range of ammeter is called ammeter shunt.
Description : Which of the following meters uses a shunt connected in series with the load, but parallel with the meter movement? A. voltmeter B. power factor meter C. wattmeter D. ammeter
Description : Which of the following statements represents the correct method of connecting the shunt of an ammeter prior to taking a reading? A. In series with the load and in series with the meter movement. B. In ... with the meter movement. D. In parallel with the load and in parallel with the meter movement.
Last Answer : Answer: B
Description : Which of the listed meters uses a shunt connected in series with the load, but parallel with the meter movement? A. Voltmeter B. Power factor meter C. Ammeter D. Wattmeter
Description : The shunt used in an ammeter should be connected in ____________. A. series with the load and in parallel with the meter movement B. parallel with the load and in series with the meter movement C. ... in parallel with the meter movement D. series with the load and in series with the meter movement
Last Answer : The function of shunt in an ammeter is to by pass the current.
Last Answer : If a DC voltmeter is made from an ammeter having a fed of 100μA then its sensitivity (in KΩ/V) will be 10.
Description : When 10 cells in series are connected to the ends of a resistance of `59 Omega`, the current is found to be 0.25 A, but when the same cells after bein
Last Answer : When 10 cells in series are connected to the ends of a resistance of `59 Omega`, the ... Calculate the internal resistance and emf of each cell.
Description : How would you arrange 64 similar cells each having an emf of 2.0 V and internal resistance `2 Omega` so as to send maximum current through an external
Last Answer : How would you arrange 64 similar cells each having an emf of 2.0 V and internal resistance ` ... current through an external resistance of `8 Omega`.
Description : 10 cells, each of internal resistance `0.5 Omega` and 1.2 V emf are connected (a) all in series and (b) all in paralle. Calculate the current sent in
Last Answer : 10 cells, each of internal resistance `0.5 Omega` and 1.2 V emf are connected (a) all in ... each case through a wire of resistance `0.8 Omega`.