Question 1

In an electro dynamometer type of wattmeter , the inductance of the pressure coil circuit produces error :

Accepted Answer

A) which is constant irrespective of the power factor of the load 
B) which is higher at low power factors 
C) which is lower at low power factors 
D) none of the above. 
A) which is constant irrespective of the power factor of the load 
B) which is higher at low power factors 
C) which is lower at low power factors 
D) none of the above. B

Question 2

A dynamometer wattmeter can be used for

Accepted Answer

A) both d.c. and a.c. 
B) d.c. only 
C) a.c. only 
D) any of the above 
A) both d.c. and a.c. 
B) d.c. only 
C) a.c. only 
D) any of the above A

Question 3

Which of the following is integrating instruments?

Accepted Answer

A) power factor meter 
B) energy meter 
C) voltmeter 
D) ammeter 
A) power factor meter 
B) energy meter 
C) voltmeter 
D) ammeter B

Question 4

The resistance in the circuit of the moving coil of a dynamometer wattmeter should be

Accepted Answer

A) almost zero 
B) low 
C) high 
D) none of the above 
A) almost zero 
B) low 
C) high 
D) none of the above

Question 5

In a low power factor wattmeter the pressure coil is connected

Accepted Answer

A) to the supply side of the current coil 
B) to the load side of the current coil 
C) in any of the two meters at connection 
D) none of the above 
A) to the supply side of the current coil 
B) to the load side of the current coil 
C) in any of the two meters at connection 
D) none of the above

Question 6

In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at

Accepted Answer

A) 0° 
B) 60° 
C) 90° 
D) 120° 
A) 0° 
B) 60° 
C) 90° 
D) 120°

Question 7

In electro dynamometer type of wattmeter current coils designed for carrying heavy currents use stranded wires or laminated conductors :

Accepted Answer

A) to reduce iron losses 
B) to reduce hysteresis losses 
C) to reduce eddy current losses in the conductors 
D) all of the above. 
A) to reduce iron losses 
B) to reduce hysteresis losses 
C) to reduce eddy current losses in the conductors 
D) all of the above.

Question 8

Which type of damping is used in Induction type energy meter?

Accepted Answer

A) air friction 
B) fluid friction 
C) gravity 
D) eddycurrent 
A) air friction 
B) fluid friction 
C) gravity 
D) eddycurrent

Question 9

The pressure coil of an induction type energy meter is

Accepted Answer

A) highly inductive 
B) highly resistive 
C) purely inductive 
D) purely resistive 
A) highly inductive 
B) highly resistive 
C) purely inductive 
D) purely resistive

Question 10

Which of the following statements is wrong

Accepted Answer

A) there is control spring 
B) there is a brake magnet 
C) creeping error is present 
D) disc revolves continuously 
A) there is control spring 
B) there is a brake magnet 
C) creeping error is present 
D) disc revolves continuously

Question 11

Hole s are drilled on the opposite sides of the spindle of an energy meter to avoid

Accepted Answer

A) balance of the disc 
B) dissipate heat generated due to eddy currents 
C) avoid creep on load 
D) increase the deflection torque 
A) balance of the disc 
B) dissipate heat generated due to eddy currents 
C) avoid creep on load 
D) increase the deflection torque

Question 12

Which of the following is an essential part of a induction type of meter ?

Accepted Answer

A) an operating torque system 
B) a braking device 
C) revolution registering device 
D) all of the above 
A) an operating torque system 
B) a braking device 
C) revolution registering device 
D) all of the above

Question 13

In an electro dynamometer type of wattmeter

Accepted Answer

A) the current coil is made fixed 
B) the pressure coil is fixed 
C) any of the two coils current coil or pressure coil can be made fixed. 
D) both the coils should be movable. 
A) the current coil is made fixed 
B) the pressure coil is fixed 
C) any of the two coils current coil or pressure coil can be made fixed. 
D) both the coils should be movable.

Question 14

The power in 3ph 4 wire circuit can be measured by using:

Accepted Answer

A) five watt meters 
B) four watt meters 
C) three watt meters 
D) 1 watt meter. 
A) five watt meters 
B) four watt meters 
C) three watt meters 
D) 1 watt meter.

Question 15

The power of a n-phase circuit can be measured by using a minimum of

Accepted Answer

A) (n - 1) wattmeter elements 
B) n wattmeter elements 
C) (n + 1) wattmeter elements 
D) 2n wattmeter elements 
A) (n - 1) wattmeter elements 
B) n wattmeter elements 
C) (n + 1) wattmeter elements 
D) 2n wattmeter elements

Question 16

The power measurement in a balanced 3-phase circuit can be done by:

Accepted Answer

A) one wattmeter method 
B) two wattmeter method 
C) three wattmeter method 
D) any of the above method 
A) one wattmeter method 
B) two wattmeter method 
C) three wattmeter method 
D) any of the above method

Question 17

The pressure coil of a wattmeter should be connected on the supply side of the current coil when

Accepted Answer

A) load impedance is high 
B) load impedance is low 
C) supply voltage is low 
D) none of the above 
A) load impedance is high 
B) load impedance is low 
C) supply voltage is low 
D) none of the above

Question 18

In an Induction type energy meter, maximum torque is obtained when the parameter of the rotating disc are

Accepted Answer

A) r=0 
B) x=0 
C) r=x 
D) none of the above 
A) r=0 
B) x=0 
C) r=x 
D) none of the above

Question 19

In a low power factor wattmeter the compensating coil is connected

Accepted Answer

A) in series with current coil 
B) in parallel with current coil 
C) in series with pressure coil 
D) in parallel with pressure coil 
A) in series with current coil 
B) in parallel with current coil 
C) in series with pressure coil 
D) in parallel with pressure coil

Question 20

In an induction type energy meter, compensation for static friction is provided by

Accepted Answer

A) drilling holes in the disc 
B) lag circuits 
C) shading bands 
D) none of the above 
A) drilling holes in the disc 
B) lag circuits 
C) shading bands 
D) none of the above

In an electro dynamometer type of wattmeter , the inductance of the pressure coil circuit produces error :

A dynamometer wattmeter can be used for

Which of the following is integrating instruments?

The resistance in the circuit of the moving coil of a dynamometer wattmeter should be

In a low power factor wattmeter the pressure coil is connected

In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at

In electro dynamometer type of wattmeter current coils designed for carrying heavy currents use stranded wires or laminated conductors :

Which type of damping is used in Induction type energy meter?

The pressure coil of an induction type energy meter is

Which of the following statements is wrong

Hole s are drilled on the opposite sides of the spindle of an energy meter to avoid

Which of the following is an essential part of a induction type of meter ?

In an electro dynamometer type of wattmeter

The power in 3ph 4 wire circuit can be measured by using:

The power of a n-phase circuit can be measured by using a minimum of

The power measurement in a balanced 3-phase circuit can be done by:

The pressure coil of a wattmeter should be connected on the supply side of the current coil when

In an Induction type energy meter, maximum torque is obtained when the parameter of the rotating disc are

In a low power factor wattmeter the compensating coil is connected

In an induction type energy meter, compensation for static friction is provided by

Electrical Instrumentation

Instrumentation and Electrical Engineering

Electrical Measurement and Testing

Energy Meter Adjustments and Measurement Techniques

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Exam 4: Watt/Meters and Energy Meters

In an electro dynamometer type of wattmeter , the inductance of the pressure coil circuit produces error :

A dynamometer wattmeter can be used for

Which of the following is integrating instruments?

The resistance in the circuit of the moving coil of a dynamometer wattmeter should be

In a low power factor wattmeter the pressure coil is connected

In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at

In electro dynamometer type of wattmeter current coils designed for carrying heavy currents use stranded wires or laminated conductors :

Which type of damping is used in Induction type energy meter?

The pressure coil of an induction type energy meter is

Which of the following statements is wrong

Hole s are drilled on the opposite sides of the spindle of an energy meter to avoid

Which of the following is an essential part of a induction type of meter ?

In an electro dynamometer type of wattmeter

The power in 3ph 4 wire circuit can be measured by using:

The power of a n-phase circuit can be measured by using a minimum of

The power measurement in a balanced 3-phase circuit can be done by:

The pressure coil of a wattmeter should be connected on the supply side of the current coil when

In an Induction type energy meter, maximum torque is obtained when the parameter of the rotating disc are

In a low power factor wattmeter the compensating coil is connected

In an induction type energy meter, compensation for static friction is provided by

Electrical Instrumentation

Instrumentation and Electrical Engineering

Electrical Measurement and Testing

Energy Meter Adjustments and Measurement Techniques

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