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 of the above statements is/are correct ? 

(a) 1 only (b) 2 only (c) 3 only (d) 1, 2 and 3

1 Answer

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. 

Which of the above statements is/are correct ? 

(a) 1 only (b) 2 only (c) 3 only (d) 1, 2 and 3

Related questions

Description : The reading of wattmeter in no load test of induction motor gives : (A) Friction and windage loss (B) Copper losses on no load in the stator (C) Core losses (D) Sum of all losses

Last Answer : A

Description : Consider the following statements with regard to power diodes : 1. The breakdown voltage is directly proportional to the doping density of the drift region. 2. Losses in the diode are ... vertically oriented structure supports large blocking voltages. Which of the above statements is/are correct ?

Last Answer : Consider the following statements with regard to power diodes : 1. The breakdown voltage is directly proportional to the doping density of the drift region. 2. Losses in the diode are less due to ... large blocking voltages. Which of the above statements is/are correct ? 2 only

Description : Consider the following statements with regard to a GTO : 1. The turn-off gain of the GTO is large. 2. Large negative gate current pulses are required to turn off the GTO. 3. GTO has large reverse blocking capability. Which of the ... is/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 a GTO : 1. The turn-off gain of the GTO is large. 2. Large negative gate current pulses are required to turn off the GTO. 3. GTO has large reverse blocking capability. Which of ... is/are correct ? (a) 1 only (b) 2 only (c) 3 only (d) 1, 2 and 3

Description : 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 ... and 2 only (b) 1 and 3 only (c) 2 and 3 only (d) 1, 2 and 3

Last Answer : 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 ... 1 and 2 only (b) 1 and 3 only (c) 2 and 3 only (d) 1, 2 and 3

Description : Consider the following statements with regard to Lissajous pattern on a CRO :  1. It is a stationary pattern on the CRO.  2. It is used for precise measurement of frequency of a voltage signal.  3. The ratio between frequencies ... /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 Lissajous pattern on a CRO :  1. It is a stationary pattern on the CRO.  2. It is used for precise measurement of frequency of a voltage signal.  3. The ratio between ... /are correct ?  (a) 1 only (b) 2 only (c) 3 only (d) 1, 2 and 3

Description : Consider the following statements  1) The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the current coil ii) The compensating coil of a low power factor wattmeter compensates the effect ... C) Both (i) and (ii) are true D) Both (i) and (ii) are false

Last Answer : A

Description :  In a household single phase induction type wattmeter, the meter can be reversed by: - a) reversing the supply terminals b) reversing the load terminal c) opening the meter connection ... opening the meter and reversing the connection of both the potential coil terminals and current coil terminals

Last Answer :  In a household single phase induction type wattmeter, the meter can be reversed by: - opening the meter connection and reversing either the potential coil terminals or current coil terminals 

Description : With regard to the physics of power systems used operate robots, which statement or statements are most correct? a) hydraulics involves the compression of liquids b) hydraulics involves the compression of air c) pneumatics involve the compression of air d) chemical batteries produce AC power

Last Answer : c) pneumatics involve the compression of air

Description : With regard to the physics of power systems used operate robots, which statement or statements are most correct? A : hydraulics involves the compression of liquids B : hydraulics involves the compression of air C : pneumatic involves the compression of air D : chemical batteries produce AC power

Last Answer : C : pneumatic involves the compression of air

Description : With regard to the physics of power systems used operate robots, which statement or statements are most correct? A : hydraulics involves the compression of liquids B : hydraulics involves the compression of air C : pneumatic involves the compression of air D : chemical batteries produce AC power

Last Answer : C : pneumatic involves the compression of air

Description : With regard to the physics of power systems used operate robots, which statement or statements are most correct? A : hydraulics involves the compression of liquids B : hydraulics involves the compression of air C : pneumatic involves the compression of air D : chemical batteries produce AC power

Last Answer : C : pneumatic involves the compression of air

Description : With regard to the physics of power systems used operate robots, which statement or statements are most correct? A : hydraulics involves the compression of liquids B : hydraulics involves the compression of air C : pneumatic involves the compression of air D : chemical batteries produce AC power

Last Answer : C : pneumatic involves the compression of air

Last Answer : An induction wattmeter can be used for A.C. 

Description : Consider the following statements:  1. A grid connected induction generator always supplies leading reactive power to the bus  2. An overexcited synchronous motor draws current at a lagging power factor  3. An underexcited synchronous ... (c) 1, 3 and 4 are correct (d) 1, 2, 3 and 4 are correct 

Last Answer : Consider the following statements:  1. A grid connected induction generator always supplies leading reactive power to the bus  2. An overexcited synchronous motor draws current at a lagging power factor  3. An underexcited ... correct (c) 1, 3 and 4 are correct (d) 1, 2, 3 and 4 are correct 

Description : Consider the following statements with regard to inverters 1. Line commutated inverters can function as isolated ac sources 2. Force commutated inverters can provide independent ac voltage with adjustable voltage and frequency 3. Thyrister ... correct statements are A)1,3 B)1,3,4 C) 2,4 D) 1,4

Last Answer : Consider the following statements with regard to inverters 1. Line commutated inverters can function as isolated ac sources 2. Force commutated inverters can provide independent ac voltage with adjustable voltage and frequency 3. ... correct statements are A)1,3 B)1,3,4 C) 2,4 D) 1,4

Description : An open occurring within the field rheostat of an AC generator can be detected by short circuiting its terminals and observing a ____________. A. negative deflection of the wattmeter pointer B. ... of the wattmeter pointer C. buildup of alternator voltage D. low, but constant alternator voltage

Last Answer : Answer: C

Description : Which statement out of the following is a wrong statement with regard to Induction motor? A) Auto-transformer starter is costlier to direct on line (DOL) starter B) DOL starter is used for ... Star delta starter connects the motor first in delta at the time of starting then in star for running

Last Answer : Which statement out of the following is a wrong statement with regard to Induction motor? A) Auto-transformer starter is costlier to direct on line (DOL) starter B) DOL starter is used for ... delta starter connects the motor first in delta at the time of starting then in star for running

Description : Consider the following statements: Star delta starter is used in 3-phase induction motor because it  1. Prevents heating of the motor winding  2. Ensures permissible minimum starting current  3. Is regulated by electricity ... and 4 are correct (c) 1, 3 and 4 are correct (d) 1 and 2 are correct 

Last Answer : Consider the following statements: Star delta starter is used in 3-phase induction motor because it  1. Prevents heating of the motor winding  2. Ensures permissible minimum starting current  3. Is regulated by ... and 4 are correct (c) 1, 3 and 4 are correct (d) 1 and 2 are correct 

Description : Consider the following statement: (1) There is no difference between the English Law and Indian Law with regard to acceptance through post. (2) Both Under the English Law and the Indian Law a contract is concluded when the ... statement is/are correct? (a)1 and 2 (b) 2 alone (c) 3 alone (d) None

Last Answer : (c) 3 alone

Description : Draw and explain the circuit diagram for measurement of single phase power using dynamometer type wattmeter. 

Last Answer : Circuit diagram for measurement of single phase power using dynamometer type wattmeter: Explanation: It consists of two stationary coils, called current coils and one moving coil, called voltage or ... i.e. power. The meter can be calibrated directly to indicate the power in watts. 

Description : State the effects of errors in dynamometer type wattmeter due to i) pc- inductance ii) pc- capacitance iii) mutual inductance iv) Connection.

Last Answer : Errors in wattmeter:  i) pc - inductance: Pressure coil inductance causes wattmeter to read more power than actual .  ii) pc-capacitance: The wattmeter reads less power.  iii) ... iv) Connection: In uncompensated wattmeter , the reading of wattmeter includes the powerloss in coils. 

Description : State any four errors that occur in dynamometer type wattmeter

Last Answer : Errors that occur in dynamometer type wattmeter: 1. Errors due to method of connection. 2. Error due to pressure coil inductance. 3. Error due to pressure coil Capacitance. 4. Error due to mutual ... Error due to eddy currents. 7. Temperature error. 8. Error due to vibration of moving system

Description : With neat diagram explain constructional details of dynamometer type wattmeter.

Last Answer : Working Principle of Wattmeter: It consists of two stationary coils, called current coils and one moving coil, called voltage or potential coil. The moving coil is mounted on the spindle, in the gap ... experiences a force and tends to move in the direction as per Fleming's left hand rule. 

Description : Explain construction & working of electrodynamometer type wattmeter.

Last Answer : Electrodynamometer Type Wattmeter:  Construction: It essentially consists of the fixed and moving coil. The fixed coil is split into two equal parts which are placed close together and parallel to each other. ... hence these instruments can be used for measurement of A.C. & D.C. power.

Description : Which one is not a correct type of wattmeter? A. Dynamometer wattmeter B. Induction wattmeter C. Electrolyte wattmeter D. Electrostatic wattmeter 

Last Answer : Electrolyte wattmeter is not a correct type of wattmeter.

Description : Consider the following statements: 2. In India, the maximum part of electric energy is generated by the hydroelectric plants. 3. In India, the maximum part of electric energy is generated by the thermal power plants. 4. Neyveli Lignite ... CPO AC 2003] (a) 2 and 3 (b) 1 and 3 (c) 2 only (d) 3 only

Last Answer : Ans: (a)

Description : Eicosanoids mediate inflammation in a variety of ways. Of the following statements, which are true with regard to this? a. Eicosanoids are stored in cytoplasmic granules ... include vasodilatation, vasoconstriction, increased vascular permeability and both chemotaxis and chemoattractant inhibition

Last Answer : Answer: b, d The eicosanoids are derived from arachidonic acid (eicosatetraenoic acid) and consist of prostaglandins, thromboxanes, leukotrienes and lipoxins. The eicosanoids are not ... nervous system d. Mononuclear phagocytes release a variety of proinflammatory cytokines and growth factors

Description : In genetic engineering, a DNA segment (gene) of interest, is transferred to the host cell through a vector. Consider the following four agents (i-iv) in this regard and select the correct option about which one or more of these ... ii) and (iv) (b) (i) only (c) (i) and (iii) (d) (ii) and (iv)

Last Answer : (d) (ii) and (iv)

Description : The operating torque of the upper induction disc-type element, or timer element, of an AC reverse power relay is obtained from ____________. A. the main bus B. a separate battery source C. line voltage D. electromagnets

Last Answer : Answer: D

Description : State the principle of wattmeter. 

Last Answer : Working Principle of Wattmeter: It consists of two stationary coils, called current coils and one moving coil, called voltage or potential coil. The current coils are connected such that they ... experiences a force and tends to move in the direction as per Fleming's left hand rule. 

Description : Merits of two wattmeter method

Last Answer : Advantages of Two Wattmeter Method for 3-Phase Power Measurement: 1) It is used for balanced as well as unbalanced load. 2) For the star type load, it is not necessary to ... reactive volt-amperes for balanced loads also. 7) The circuit connections are independent of load connection.

Description : Compare CC and PC of wattmeter on the basis of:- (i) Connection (ii) Status (iii) Number of turns (iv) Gauge of wire.

Last Answer : Particulars Current coil (CC) Pressure coil (PC) Connection Connected in series with load Connected in parallel with load Status It is fixed coil in wattmeter It is moving coil in ... number of turns It is having more number of turns Gauge of wire Less More

Description : State any two disadvantages of one wattmeter method of measurement of 3 phase power.

Last Answer : State any two disadvantages of one wattmeter method of measurement of 3 phase power. Disadvantages of one wattmeter method:- 1. Only used for balanced load 2. It can not be used for ... connection then neutral point must be available 4. Delta connection must be opened to connect current coil.

Description : State various types of errors in wattmeter.

Last Answer : Types of Error in wattmeter: 1. Errors due to method of connection. 2. Error due to pressure coil inductance. 3. Error due to pressure coil Capacitance. 4. Error due to mutual inductance effect. 5. ... . Error due to eddy currents. 7. Temperature error. 8. Error due to vibration of moving system.

Description : List the different errors in wattmeter & explain compensation for it.

Last Answer : Errors in Wattmeter Compensation method Error due to connection method To overcome this error, wattmeters are provided with additional compensating winding which is connected in series with ... due to friction The weight of moving system be reduced to minimum possible.

Description : List one advantage and one disadvantage of one wattmeter method. 

Last Answer : Advantages:  1) Only one wattmeter is used.  2) Less number of connections.  3) Cost required is less.  Disadvantages:  1) Used only for 3- Φ balanced load and not for ... be accessible for connecting the Pressure coil.  3) Delta connection must be opened to connect current coil. 

Description : 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.

Description : In two -wattmeter method of power measurement, if one wattmeter shows negative reading, then the power factor of the circuit is treated as (A) Unity (B) Lagging (C) Leading (D) Zero

Last Answer : Lagging   power   factor.

Description : The power delivered to a three-phase load can be measured by the use of 2 wattmeter only when the A. Load is balanced B. 3 -phase load is connected to the source through 3 wires C. Load is unbalanced D. 3 -phase load is connected to the source through 4 wires

Last Answer : The power delivered to a three-phase load can be measured by the use of 2 wattmeter only when the  Load is unbalanced

Description : which of the following statements is true with regard to pakistan -General Knowledge

Last Answer : A. Religion has no role in the legal system.

Description : in regard to exercise, which of the following statements about safety consideration is correct? -General Knowledge

Last Answer : In regard to exercise, the following statement about safety consideration is correct: Remaining well-hydrated while exercising is best.

Description : which of the following statements is correct in regard to apical and floral meristems? -General Knowledge

Last Answer : (B) Apical meristems are sometimes changed into floral meristems

Description : Which one of the following statements in regard to the excretion by the human kidneys is correct?

Last Answer : Which one of the following statements in regard to the excretion by the human kidneys is ... glomerular filtrate is reabsorbed by the renal tubules

Description : Which one of the following statements in regard to the excretion by the human kidneys is correct?

Last Answer : Which one of the following statements in regard to the excretion by the human kidneys is correct ... of Loop of Henly is impermeable to electrolytes

Description : Which of these statements is not true with regard to starting a new job?

Last Answer : No one will be paying any attention to you or watching to see what type of person you are.

Description : Which of the following statements is true with regard to the erratic behaviour of Indian monsoons? (a) Uniform duration but varying amounts of rain from one year to another, as well as at ... of rainfall during different years (d) Uniform duration but varying amounts of rain from place to place

Last Answer : Ans: (c)

Description : With regard to the rate of return on investment (ROI), which one of the following statements is not valid ? (A) It is an overall indicator of the profitability of an enterprise (B) It is a ... superior measure compared to the cash flow generated per share (D) It was first developed by Dupont, USA

Last Answer : Answer: It is a superior measure compared to the cash flow generated per share

Description : With regard to the powers of the Rajya Sabha, which one among the following statements is not correct? (1) A money bill cannot be introduced in the Rajya Sabha (2) The Rajya Sabha has no power ... the Annual Financial Statement (4) The Rajya Sabha has no power to vote on the Demands for Grants

Last Answer : (3) The Rajya Sabha cannot discuss the Annual Financial Statement Explanation: A Money Bill cannot be introduc in Rajya Sabha. Rajya Sabha has no power either to reject or amend a Money Bill. It ... Sabha may discuss the Annual Financial Statement. It has no power to vote on the Demands for Grants.

Description : Which one among the following statements is not correct? (1) The right conferred by Article 32 cannot be suspended except by virtue of Article 359 (1) of the Constitution of India (2) The ... made by the Parliament with regard to members of the forces charged with the maintenance of public order

Last Answer : (3) Punishments can he prescribed by a State Legislation for offences under Part 111 of the Constitution of India Explanation: The State shall not make any law which takes away or abridges the rights ... law made in contravention of this clause shall, to the extent of the contravention, be void.