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Moving iron and PMMC instruments can be distinguished from each other by looking at: Scale

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0 answers 12 views

Two voltmeters of same range, one moving iron type and other permanent magnet moving coil type, are connected in parallel for measuring a.c. supply voltage. If the reading of MI type is 300V, the reading of PMMC type will be (a) zero (b) higher-than M.I. type (c) lower than M.I. type (d) same

asked May 25, 2018 in Electrical Measurements and Instrumentation by Shimroz123
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Moving iron instruments can be used for measuring (1) Direct currents and voltages (2) Radio frequency currents (3) A.C currents and voltages (4) Both (a) and (c)

asked Apr 11, 2018 in Electrical Engineering by Shimroz123
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Horizontally mounted moving iron instruments use   (a) Eddy current damping (b) Electromagnetic damping (c) Fluid friction damping (d) Air friction damping

asked May 13, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 17 views

State the material used for moving coil and former for PMMC instruments. 

asked Sep 5, 2018 by Shimroz123
1 answer 15 views

In moving iron instruments, eddy current damping cannot be used as  (a) They have a strong operating magnetic, field (b) They are not normally used in vertical position (c) They need a large damping force, which can only be provided by air friction (d) The introduction of a permanent magnet required for eddy current damping would distort the existing weak operating magnetic field

asked Apr 23, 2018 in Electrical Engineering by Shimroz123
1 answer 195 views
1 answer 43 views

Consider the following statements with regard to Moving Iron (MI) instruments :  1. These instruments possess high operating torque.  2. These instruments can be used in ac and dc circuits.  3. Power consumption in these instruments is lower for low voltage range.  Which of the above statements are correct ?  (a) 1 and 2 only (b) 1 and 3 only (c) 2 and 3 only (d) 1, 2 and 3

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
1 answer 35 views

What would be the total power drawn from the supply, when two heaters, rated at 1000 W, 250 V each are connected in series across a 250 V, 50 Hz supply?  (A) 1000 W (B) 500 W (C) 250 W (D) 2000 W

asked Apr 5, 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
1 answer 12 views

Which of the following instruments can be used for measurement of very high value resistances such as insulation resistance in industries? A) Wheatstone bridge B) Megger C) Ohm-meter D) Resistive potentiometer 

asked Jun 17, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 2,714 views

Which of the following instruments can be used to measure AC current only? (a) Permanent Magnet Type ammeter(b) Induction type ammeter (c) Moving iron voltmeter(d) Moving iron ammeter

asked Mar 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
0 answers 19 views

The moving iron voltmeter indicates (a) the same value for dc and ac voltages. (b) lower values for ac voltage than for corresponding dc voltage. (c) higher value for ac voltage than for corresponding dc voltage. (d) none of these. 

asked May 25, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 58 views

An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be  (1) unaffected (2) decreased (3) increased (4) either decreased or increased depending on the direction of the DC field

asked Apr 29, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 33 views

A 150 V moving iron voltmeter of accuracy class 1.0 reads 75 V when used in a circuit under a standard conditions. The maximum possible percentage error in the reading is:

asked Mar 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
2 answers 13 views
1 answer 14 views

Thyristor can be protected from over voltages by using

asked May 8, 2018 in Power Electronics by Shimroz123
1 answer 10 views

The state equations in the phase variable canonical form can be obtained from the transfer function by (a) Cascade decomposition (b) Direct decomposition (c) Inverse decomposition (d) Parallel decomposition

asked Apr 23, 2018 in Control System by Shimroz123
2 answers 74 views

The sum of product expression for a Boolean function can be derived from its truth table by (a) AND operation of the product terms. (b) NOR operation of the product terms. (c) OR operation of the product terms. (d) NAND operation of the product terms.

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

By which of the following connections, one-bit binary counter can be obtained from a JK flip-flop?  A) J = K = 0 B) J = K = 1 C) J = K’ D) None of these

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 16 views

The line of sight communication requires transmit and receive antenna to face each other. If the transmit antenna is vertically polarized, for the best reception the receive antenna should be:  (1) Horizontally polarized (2) Vertically polarized (3) At 45° with respect to the horizontal polarization (4) At 45° with respect to the vertical polarization

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 8 views

The measurement range of an ammeter can be increased by using a:

asked May 22, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 17 views

The power delivered to a 3-phase load can be measured by the use of two wattmeters only when the  (a) load is unbalanced (b) load is balanced (c) three phase load is connected to the source through three wires (d) three phase load is connected to the source through four wires

asked May 13, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 25 views

Range of a voltmeter can be extended by connecting a

asked May 12, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 37 views

An induction type energy meter is found to run fast. Correction for this error can be made by  (A) Over-load compensation. (B) Voltage compensation. (C) Moving the brake magnet away from the centre of the disc. (D) Moving the brake magnet towards the centre of the disc.

asked Apr 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123

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