# The measurement of dielectric loss and power factor is done using...

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The measurement of dielectric loss and power factor is done using

(A) Weins Bridge (B) Hays Bridge (C) Schering Bridge (D) Wheat Stone Bridge

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C Schering brigde

## Related questions

What is the power factor of a cable of loss angle “ө”?  (A) sin ө (B) cos ө (C) tan ө (D) Independent of ө

With the help of which bridge are the capacitance and dielectric loss of a capacitor generally measured ?

The power factor of dielectric :  (A) is a function of temperature of the dielectric only (B) depends only on voltage stress to which the dielectric is stressed (C) always constant (D) both (A) and (B)

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

For an insulating material, dielectric strength and dielectric loss should be respectively   (A) high and high (B) low and high (C) high and low (D) low and low.

For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging:

The bridge used to measure the dielectric loss of an insulator is: A) Anderson bridge B) Wien’s bridge C) Schering bridge D) Any of the above

Draw and explain the measurement of torque using Torque Cell

The bridge most suited for accurate measurement of relative permittivity of dielectric materials is (A) Carey Foster Bridge (B) Anderson’s bridge (C) Heaviside Bridge modified by Campbell. (D) Schering Bridge.

What is the maximum data rate that can be transmitted using a QPSK modulation with a roll-off factor of 0.2 for a 36 MHZ transponder?  A) 7.2 Mbps B) 30 Mbps C) 43.2 Mbps D) 60 Mbps

Calculate the power loss, if power generated by two plants are P1=50 MW and P2 =40 MW and the loss coefficients are B11=0.001, B22=0.0025 and B12=-0.0005.  (A) 4.5 MW (B) 5.5 MW (C) 6.5 MW (D) 8.5 MW

What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these

Draw and explain the displacement measurement system using LVDT.

In a circuit containing R, L and C, power loss can take place in?

The corona loss of a 3-phase transmission line is 100 kW at 60 kV/phase and 25 kW at 50 kV/phase. The disruptive critical voltage is (A) 40 kV (B) 43.6 kV (C) 49.6 kV (D) 50 kV

A transformer has maximum efficiency at 3/4 full load. The ratio of its iron losses and full load copper loss is : -  a) 16/9 b) 4 / 3 c) 3/4 d) 9 /16

Dielectric loss in a capacitor is best measured by (A) Wien Bridge (B) Schering Bridge (C) Anderson Bridge (D) Heaviside-Campbell Equal Ratio Bridge

When alternator excitation increases and machine is operating at lagging power factor then (A) Armature current increases (B) Armature current decreases (C) Armature current remains unchanged (D) Armature voltage remains unchanged

A 1-phase, 7.46 kW motor is supplied from a 400 V, 50 Hz A.C mains. Its efficiency is 85% and power factor is 0.8 lagging. Calculate the KVA input (1) 9.56 kVA (2) 5.4 Kva (3) 10.97 kVA (4) 8.6 kVA

An alternator is delivering rated current at rated voltage and 0.8 power-factor lagging. For delivering rated current at rated voltage and 0.8 poWer—factor leading, the required excitation will be:  (A) less  (B) more (C) more or less (D) the same

Draw and explain in brief speed measurement using non-contact type transducer.

Draw and explain force or weight measurement using load cell.

Draw and explain temperature measurement using RTD. State its advantages and disadvantages.

In a power generating station the Demand Factor and Load Factor are 0.5 and 0.2, respectively. If the connected load is 400 MW, the average demand is (A) 40 MW (B) 100 MW (C) 140 MW (D) 280 MW

How can we improve power factor using synchronous motor?

For a short transmission line with r/x ratio of is 1.0, the regulation will be zero when the load power factor is

Two wattmeters are used to measure the power in a 3 -phase balanced system. What is the power factor of the load when one wattmeter reads twice the other ?  (a) 0 (b) 0.5 (c) 0.866 (d) 1

. If the peak transmitted power in a radar system is increased by a factor of 16, the maximum range will be increased by a factor of : (A) 2 (B) 4 (C) 8 (D) 16

The power factor of a spot welding machine is expected to be around (1) Unity (2) 0.8 lagging (3) 0.3-0.5 lagging (4) 0.8 leading

A single phase motor draws a current of 5 A from a 120 V, 60 Hz line. The power factor of the motor is 65%. Calculate the active power absorbed by the motor.  (A) 600 W (B) 390 W (C) 456 W (D) 650 W

The power factor of a D.C. circuit is always?

The ratio of active power to apparent power is known as____ factor.

The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is?

Power factor of the system is kept high?

What is the power factor of purely resistive circuit.

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

In-circuit erasing and programming (without uv light) is done in the case of  A) MROM B) PROM C) EPROM D) EEPROM

We wish to build a 135 V, 20 A, DC power supply using a single phase bridge rectifier and an inductive filter. The peak to peak current ripple should be about 10%. If a 60 Hz AC source is available; Calculate the peak to peak current ripple.  (A) 19 A (B) 20 A (C) 2 A (D) 1 A

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

In the measurement of three phase power by two wattmeter method, if the two wattmeter readings are equal then power factor of the circuit is  (A) 0.8 lag (B) Unity (C) 0.8 lead (D) Zero

Power-factor of industrial arc and induction furnace is: