Last Answer : In a low power factor wattmeter the compensating coil is connected in series with pressure coil.
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508 views
1 answer
asked
Mar 21, 2018
by
anonymous
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Last Answer : In a low power factor wattmeter the pressure coil is connected to the load side of the current coil.
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398 views
1 answer
asked
Mar 21, 2018
by
anonymous

In dynamometer type of wattmeter, which of the coil is split up into two parts?
Last Answer : In dynamometer type of wattmeter, which of the coil is split up into two parts? current coil
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713 views
1 answer
asked
May 29, 2018
by
anonymous

The current coil of a wattmeter is connected to the C.T. of R phase. Its potential coil is connected across Y & B phases. The wattmeter measures (a) active power in R phase (b) active power of Y-phase (c) reactive power in R-phase (d) power proportional to 3-phase power if the load is balanced
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488 views
0 answers
asked
May 25, 2018
by
anonymous

The pressure coil of a dynamometer type wattmeter is A) Highly inductive B) Highly resistive C) Purely resistive D) Purely inductive
Last Answer : highly resistive
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3.5k views
4 answers
asked
May 20, 2018
by
anonymous

The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures
Last Answer : The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures Reactive power of R phase.
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151 views
1 answer
asked
Mar 28, 2018
by
anonymous

Last Answer : The pressure coil of a wattmeter should be connected on the supply side of the current coil when load impedance is high.
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243 views
1 answer
asked
Mar 21, 2018
by
anonymous

Last Answer : The resistance in the circuit of the moving coil of a dynamometer wattmeter should be high.
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240 views
1 answer
asked
Mar 21, 2018
by
anonymous

For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging:
Last Answer : For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging: One of the wattmeter connections will have to be reversed
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912 views
1 answer
asked
May 22, 2018
by
anonymous

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 ... b) 2, 3 and 5 (c) 1, 2, 3, 4 and 5 (d) 1, 2, 3 and 5
Last Answer : 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- ... b) 2, 3 and 5 (c) 1, 2, 3, 4 and 5 (d) 1, 2, 3 and 5
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328 views
1 answer
asked
May 13, 2018
by
anonymous

The true power indicated by a wattmeter depends on the current flow through the load, the magnitude of the potential across the load, and the _____________. A. power factor of the load B. angle of coil displacement C. inertia of the movable coil D. high resistance from the load
Last Answer : Answer: A
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8 views
1 answer

The true power indicated by the pointer movement of a wattmeter depends on the current flow through the load, the magnitude of the potential across the load, and the ____________. A. power factor of the ... B. angle of coil displacement C. inertia of the movable coil D. high resistance from the load
Last Answer : Answer: A
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7 views
1 answer
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Martin’s factor compensates for curvature effect in springs. a) True b) False
Last Answer : b) False
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4 views
1 answer

The basic meter movement responds to the flow of current through its coil. Therefore, this meter movement may be used as a/an _____________. A. voltmeter by placing a resistance in parallel with the ... in parallel with the coil D. ammeter by placing a low resistance in parallel with the coil
Last Answer : Answer: D
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3 views
1 answer

175 views
0 answers
asked
Feb 29, 2020
by
anonymous

In the measurement of power of balanced load by two wattmeter method in a 3-phase circuit, The readings of the wattmeters are 4 kW and 2 kW respectively, the later is being taken after reversing the connections of current coil. the ... kVAR B) 0.2 & 6 √3 kVAR C) 0.32 & 2 kVAR D) 0.32 & 2 √3 kVAR
Last Answer : In the measurement of power of balanced load by two wattmeter method in a 3-phase circuit, The readings of the wattmeters are 4 kW and 2 kW respectively, the later is being taken after reversing the ... of current coil. the power factor and reactive power of the load is 0.2 & 6 √3 kVAR
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443 views
1 answer
asked
Jun 17, 2018
by
anonymous
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While measuring power in a three phase load by two wattmeter method, the reading of two wattmeter are equal and opposite, when (a) load is balanced (b) power factor is unity (c) phase angle is between 60° to 90° (d) the load is purely inductive
Last Answer : Option (d) Load is purely inductive
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918 views
1 answer
asked
May 26, 2018
by
anonymous

If a dynamometer wattmeter is connected in an ac circuit, the power indicated by the wattmeter will be (a) volt-ampere product (b) average power (c) peak power (d) instantaneous power
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120 views
0 answers
asked
May 26, 2018
by
anonymous

The minimum number of wattmeter(s) required to measure 3-phase, 3-wire balanced or unbalanced power is A) 1 B) 2 C) 3 D) 4
Last Answer : B
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3.1k views
2 answers
asked
May 20, 2018
by
anonymous
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In the measurement of power by two wattmeter method, when the readings of the two wattmeters are equal, the power factor is (A) Zero (B) Leading (C) Lagging (D) Unity
Last Answer : In the measurement of power by two wattmeter method, when the readings of the two wattmeters are equal, the power factor is Unity
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879 views
1 answer
asked
May 12, 2018
by
anonymous
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Last Answer : In the case of power measurement by two wattmeter method in a balanced 3Φ system with a pure inductive load both the Wattmeter will indicate the same but of opposite sign.
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208 views
1 answer
asked
Mar 28, 2018
by
anonymous

In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be?
Last Answer : In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be 0.5.
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560 views
1 answer
asked
Mar 21, 2018
by
anonymous

In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was?
Last Answer : In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was unity.
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1.6k views
1 answer
asked
Mar 21, 2018
by
anonymous
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Two wattmeter method is employed to measure power in a 3 -phase balanced system with the current coil connected in the A and C lines. The phase sequence is ABC. If the wattmeter with its current coil in A -phase line reads zero, then the power factor of the 3 -phase load will be
Last Answer : Two wattmeter method is employed to measure power in a 3 -phase balanced system with the current coil connected in the A and C lines. The phase sequence is ABC. If the wattmeter with its current coil in A -phase line reads zero, then the power factor of the 3 -phase load will be 0.5 lagging.
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348 views
1 answer
asked
Apr 23, 2018
by
anonymous

A current carrying conductor making an electrical contact with a wiring metal conduit is indicated by a _____________. A. low switchboard wattmeter reading B. reading of 1.0 on the power factor meter C. high switchboard voltmeter reading D. totally darkened switchboard ground-detecting light
Last Answer : Answer: D
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41 views
1 answer

An electrodynamic wattmeter is not considered suitable for low power factor circuits because of (A) Inductance of voltage coil (B) Reactance of current coil (C) Power loss in voltage coil (D) Power loss in current coil
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170 views
0 answers
asked
Apr 14, 2018
by
anonymous

Consider the following statements with regard to induction type wattmeter : 1. Can be used on both ac and dc systems. 2. Power consumption is relatively low. 3. It is accurate only at stated frequency and temperature. Which ... /are correct ? (a) 1 only (b) 2 only (c) 3 only (d) 1, 2 and 3
Last Answer : Consider the following statements with regard to induction type wattmeter : 1. Can be used on both ac and dc systems. 2. Power consumption is relatively low. 3. It is accurate only at stated frequency and temperature. ... correct ? (a) 1 only (b) 2 only (c) 3 only (d) 1, 2 and 3
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246 views
1 answer
asked
Apr 25, 2018
by
anonymous

To increase crop production, food engineers combine two plants so that each plant's strength compensates for the other's weakness. What is this technique called?
Last Answer : plant breeding
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3 views
1 answer
asked
Feb 1
by
anonymous

While dusting a carpet, we give a sudden jerk or beat it with a stick because _____. A. Inertia of rest keeps the dust in its position and the dirt is removed by the movement of carpet away B. ... the force of adhesion between the dust and the carpet and the dust is removed D. None of the these
Last Answer : ANSWER: B
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3 views
1 answer

Local action in a dry-cell, or lead-acid storage battery is the process whereby ________________. A. hydrogen gas is liberated B. the electrolyte compensates for overcharging C. potassium hydroxide ... carbon dioxide from the air D. the battery becomes discharged without being connected to a load
Last Answer : Answer: D
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42 views
1 answer

A compensated wattmeter has its reading corrected for error due to (a) Frequency (b) Friction (c) Power consumed in current coil (d) Power consumed in pressure coil
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159 views
0 answers
asked
May 26, 2018
by
anonymous

A wattmeter is connected as shown in the figure. The wattmeter reads
Last Answer : A wattmeter is connected as shown in the figure. The wattmeter reads Power consumed by Z2
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3.0k views
1 answer
asked
May 20, 2018
by
anonymous

Poynting vector wattmeter is based on (A) Seebeck effect (B) Ferranti effect (C) Induction effect (D) Hall effect
Last Answer : Poynting vector wattmeter is based on Induction effect
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5.7k views
1 answer
asked
May 17, 2018
by
anonymous

The torque produced in wattmeter is proportional to
Last Answer : A
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1.2k views
2 answers
asked
Apr 26, 2018
by
anonymous

Last Answer : Wattmeter cannot be designed on the principle of moving iron instrument.
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969 views
1 answer
asked
Mar 28, 2018
by
anonymous

Last Answer : An induction wattmeter can be used for A.C.
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110 views
1 answer
asked
Mar 21, 2018
by
anonymous

Last Answer : A dynamometer wattmeter can be used for both D.C. and A.C.
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314 views
1 answer
asked
Mar 21, 2018
by
anonymous

Moving coil in dynamometer wattmeter connected a) In series with fixed coil b) Across supply c) In series with load d) Across load
Last Answer : Ans: Across supply
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33 views
1 answer

Explain the error occurred due to pressure coil inductance of electrodynamometer type wattmeter. How this error is compensated?
Last Answer : For power measurement assume that the pressure coil of wattmeter is purely restitive. Hence current taken by pressure coil Ipc is in phase with voltage across the pressure coil Vpc ... inductive reactance XL the pressure coil circuit is made purely resistive and the error is eliminated.
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754 views
1 answer
asked
Jul 11, 2020
by
anonymous

The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is (A) 11% (B) 9% (C) 1.1% (D) 3%
Last Answer : The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is 11%
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331 views
1 answer
asked
Apr 25, 2018
by
anonymous

Moving coil in dynamometer wattmeter connected : - a) in series with fixed coil b) across supply c) in series with load d) across load
Last Answer : Moving coil in dynamometer wattmeter connected : - across supply
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777 views
1 answer
asked
Apr 14, 2018
by
anonymous

A dynamometer type wattmeter with its voltage coil connected across the load side of instrument reads 250 W. If the load voltage be 200 V, what power is being taken by load? The voltage coil has resistance of 2000 Ω. (1) 200 W (2) 215W (3) 230 W /(4) 245 W
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432 views
0 answers
asked
Apr 11, 2018
by
anonymous

Which one of the following statements for a dc machine which is provided with inter pole winding (IW) as well as compensating winding (CW) is correct a) Both IW and CW are connected in ... parallel with Armature winding d) CW connected in series but IW is connected in parallel with Armature winding
Last Answer : Ans: Both IW and CW are connected in series with Armature winding
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30 views
1 answer

Last Answer : A moving-coil permanent-magnet instrument can be used as ammeter by using a low resistance shunt.
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290 views
1 answer
asked
Mar 21, 2018
by
anonymous

Where a thermal-acting breaker is required to be used in an area of unusually high, low, or constantly fluctuating temperatures, an ambient compensating element must be used. This element consists of ... arm B. conical spring on the contact arm C. second bimetal element D. second electromagnet
Last Answer : Answer: C
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5 views
1 answer

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
Last Answer : Answer: D
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5 views
1 answer

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
Last Answer : Answer: C
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4 views
1 answer

A portable hand-held and is very handy for determining the power consumption and power factor of individual motors and other inductive devices. a) Voltmeter and wattmeter. b) Wattmeter and power factor meter. c) Light meter and flash meter.
Last Answer : Voltmeter and wattmeter.
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25 views
1 answer

In a two-wattmeter method of power measurement, the readings of two wattmeters are equal when power factor is
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26 views
0 answers

Explain the effect of power factor on wattmeter reading in two wattmeter method for power measurement.
Last Answer : Effect of P.F. on Reading of Wattmeter in Two Wattmeter Method:
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1.8k views
1 answer
asked
Jul 11, 2020
by
anonymous
