How many types of types of relays are there?
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Aug 17, 2019
by
anonymous

IDMT relays are used to protect the transformer against : (A) Internal short -circuits (B) Open circuits (C) External short circuits (D) Oil leakage
Last Answer : IDMT relays are used to protect the transformer against : External short circuits
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3.1k views
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Apr 30, 2018
by
anonymous

Last Answer : Thermal overload relays are used to protect the motor against overcurrent due to heavy loads.
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254 views
1 answer
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Mar 19, 2018
by
anonymous

Last Answer : Protective relays are devices that detect abnormal conditions in electrical circuits by measuring constantly the electrical quantities which differ during normal and abnormal conditions.
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132 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : The inverse definite mean time relays are used for over current and earth fault protection of transformer against internal short-circuits.
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2.6k views
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Mar 20, 2018
by
anonymous

Last Answer : The single phasing relays are used for the protection of three phase motors.
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299 views
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Mar 20, 2018
by
anonymous
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Last Answer : Impedance relays are used for phase faults on long line.
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1 answer
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Mar 20, 2018
by
anonymous

Last Answer : Discrimination between main and back up protection is provided by the use of relays which are slow.
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396 views
1 answer
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Mar 20, 2018
by
anonymous

Last Answer : Directional relays are based on flow of power.
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165 views
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Mar 19, 2018
by
anonymous

D.C. shunt relays are made of?
Last Answer : D.C. shunt relays are made of many turns of thin wire.
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2.7k views
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Mar 19, 2018
by
anonymous

Last Answer : Overload relays are of induction, solid state, thermal, electromagnetic type.
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73 views
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Mar 19, 2018
by
anonymous

Last Answer : Relays can be designed to respond to changes in resistance, reactance or impedance voltage and current, light intensity, temperature.
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145 views
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Mar 19, 2018
by
anonymous

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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374 views
1 answer
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Mar 21, 2018
by
anonymous

Last Answer : The primary reason for low power factor is supply system is due to installation of induction motors.
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115 views
1 answer
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Mar 20, 2018
by
anonymous

At which time power factor of the induction motor is low?
Last Answer : The power factor of the inducction motor is low at the time of starting as compare to while the induction motor is running.
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151 views
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Mar 3, 2018
by
anonymous

Last Answer : MOSFET have high current losses due to High on state resistance. Hence MOSFET is used for low power applications.
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113 views
1 answer
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Sep 22, 2017
by
anonymous

To protect most of the electrical equipment handling low power, the types of relays used are (a) thermocouple (b) electronic and bimetallic (c) both (a) and (b) (d) none of the above
Last Answer : (c) both (a) and (b)
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1 answer

What are the types of power generation?
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Mar 10, 2018
by
anonymous

What are the types of power losses in inductor?
Last Answer : Copper losses, Eddy current loss, and hysteresis loss are the types of power losses in inductor.
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118 views
1 answer
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Mar 8, 2018
by
anonymous

what are the three different types of Electric power?
Last Answer : Real,reactive,apparent power
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2 answers
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Dec 4, 2017
by
anonymous

Consider the following statements. Which of these statements are correct ? (1) Reactance relays are preferred for ground fault relaying (2) Impedance relays are most suitable for:protecting long transmission lines (3) Mho relays are best ... (1) and (3) (C) (2) and (4) (D) (1), (2) and (4)
Last Answer : Consider the following statements. Which of these statements are correct ? (1) Reactance relays are preferred for ground fault relaying (2) Impedance relays are most suitable for:protecting long transmission lines (3) Mho relays are ... (1) and (3) (C) (2) and (4) (D) (1), (2) and (4)
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131 views
1 answer
asked
Apr 29, 2018
by
anonymous

State different types of electrical signal and draw all types of waveforms.
Last Answer : Types of electrical signals 1) Sine wave 2) Triangular wave 3) Square wave Waveforms
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176 views
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asked
May 2, 2020
by
anonymous

To protect the power transformer (Y-Y with neutral grounded) against fault, what type of connection do the CTs have ?
Last Answer : To protect the power transformer (Y-Y with neutral grounded) against fault, what type of connection do the CTs have ? Δ-Δ connection
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558 views
1 answer
asked
Apr 27, 2018
by
anonymous

How to Treat Low Blood Sugar ?
Last Answer : How to Treat Low Blood Sugar Low blood sugar or hypoglycemia is a condition usually experienced by diabetics but it's also possible to experience it without being a diabetic yourself. For diabetics, low ... identify the cause of the problem and help you get the proper treatment as soon as possible.
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May 8, 2021
by
anonymous

Low Fat Barbecue Chicken
Last Answer : Low Fat Barbecue Chicken Dinner 4 lg. chicken breasts, cubed 1 green pepper, cut up 1 onion, cut up 1/2 to 3/4 c. barbecue sauce 1 to 2 bags Minute Rice, boil-in-bags Put chicken with green ... rice in center of plate. Make a nest and put chicken in center of rice. Looks nice and tastes great.
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May 3, 2021
by
anonymous

Low-Calorie Dressing
Last Answer : Low-Calorie Dressing - serves 6 salad dressing 1 6-ounce can vegetable or tomato juice 1 tbsp very finely chopped onion 1 tbsp very finely chopped celery 1 tbsp very finely chopped bell pepper ... , oregano, tarragon or herb seasoning for the parsley will give a range of flavored salad dressing.
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1 answer
asked
Apr 29, 2021
by
anonymous

Name two methods for measurement of low, medium and high resistance. Give one advantage and one limitation of V- I method.
Last Answer : Methods for measurement of low resistance: 1. Ammeter voltmeter method 2. Kelvin's bridge method 3. Ohm meter method 4. Potentiometer method 5. Digital/analog multi-meter ... must be infinity for perfectly accurate measurement which is not possible. 2. Connection errors.
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2.7k views
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asked
Sep 6, 2018
by
anonymous

Name the method used to measure following resistances:- (i) Low resistance (ii) Medium resistance (iii) Insulation resistance (iv) Earth resistance.
Last Answer : Following are the methods used to measure resistances:- (i) Low resistance: 1.Voltmeter-Ammeter Method 2. Kelvin's Double bridge Method (ii) Medium resistance: 1.Voltmeter-Ammeter Method 2. ... of Charge Method (iv) Earth resistance : 1. Fall of Potential Method 2. Earth tester
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2.6k views
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asked
Sep 6, 2018
by
anonymous

State the range for low and medium resistance.
Last Answer : Low resistances: less than 1 ohm. Medium resistances: 1 ohm to 0.1 Mega ohm.
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74 views
1 answer
asked
Sep 6, 2018
by
anonymous

Step-down transformer converts high voltage and low current into: (A) How voltage and high current (B) High voltage and low current (C) Low voltage and high current (D) None of the above
Last Answer : Step-down transformer converts high voltage and low current into: Low voltage and high current
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125 views
1 answer
asked
May 8, 2018
by
anonymous

Which of the following is the least expensive protection for over current in low voltage system? (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker
Last Answer : Which of the following is the least expensive protection for over current in low voltage system? (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker
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260 views
1 answer
asked
May 8, 2018
by
anonymous

In a 741 Op-Amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to the (A) applied load (B) internal compensation (C) impedance of the source (D) power dissipation in the chip
Last Answer : In a 741 Op-Amp, there is 20 dB/decade fall-off starting at a relatively low frequency. This is due to the internal compensation
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162 views
1 answer
asked
Apr 26, 2018
by
anonymous

Accurate measurement of very low resistances is possible with (A) Megger (B) Wheatstone Bridge (C) Kelvin’s Double Bridge (D) Wagner’s Earthing Device
Last Answer : Accurate measurement of very low resistances is possible with Kelvin’s Double Bridge
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107 views
1 answer
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Apr 25, 2018
by
anonymous

Last Answer : Turbine used for low head is Kaplan turbine.
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79 views
1 answer
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Mar 26, 2018
by
anonymous

At very low frequencies a series R-C circuit behaves as almost purely?
Last Answer : At very low frequencies a series R-C circuit behaves as almost purely capacitive.
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2.8k views
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asked
Mar 25, 2018
by
anonymous

In an AC. circuit, a low value of kVAR compared with kW indicates?
Last Answer : In an AC. circuit, a low value of kVAR compared with kW indicates high power factor.
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713 views
1 answer
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Mar 25, 2018
by
anonymous

Last Answer : A synchronous machine with low value of short-circuit ratio has lower stability limit.
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Mar 20, 2018
by
anonymous

Last Answer : A low utilization factor for a plant indicates that plant is used for stand by purpose.
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180 views
1 answer
asked
Mar 20, 2018
by
anonymous

The efficiency of a transformer, under heavy loads, is comparatively low because?
Last Answer : The efficiency of a transformer, under heavy loads, is comparatively low because copper loss becomes high in proportion to the output.
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114 views
1 answer
asked
Mar 19, 2018
by
anonymous

What is the definition of extra low voltage?
Last Answer : Extra-low voltage (ELV) is an electricity supply voltage in a range which carries a low risk of dangerous electrical shock.
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134 views
1 answer
asked
Mar 10, 2018
by
anonymous

What is the difference between a line voltage and low voltage control system?
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118 views
0 answers
asked
Mar 10, 2018
by
anonymous
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What is considered low voltage and high voltage?
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76 views
0 answers
asked
Mar 10, 2018
by
anonymous

write short notes on Low-pass filter.
Last Answer : low-pass filter (1) filter exhibiting frequency selective characteristic that allows low-frequency components of an input signal to pass from filter input to output unattenuated all high-frequency components are ... the bandwidth of the filter. A filter whose impulse response is a low-pass signal.
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143 views
2 answers
asked
Oct 28, 2017
by
anonymous

A lightening arrester connected between the line and earth in a power system (1) protects the terminal equipment against travelling surges (2) protects the transmission line against direct ... suppresses high frequency oscillations in the line (4) reflects back the travelling wave approaching it
Last Answer : A lightening arrester connected between the line and earth in a power system protects the terminal equipment against travelling surges
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365 views
1 answer
asked
Apr 29, 2018
by
anonymous


Types of Fire Extinguishers? Use of Fire Extinguisher ?
Last Answer : Ans. CO2 Type Fire Extinguishers, DCP type Fire Extinguishers Used for extinguishing fires of (1) Solid fires (2) Liquid fires (3) Gasfires(4)Electric
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6 views
1 answer

Wiring – types
Last Answer : Ans) a. Casing & Capping b. Concealed wiring c. Cleat Wiring d. Conduit Wiring – Cutting of wall.
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29 views
1 answer

Enlist the types of shapers.
Last Answer : Types of shapers: Based on the type of driving mechanism: a) Crank type shaper. b) Geared type shaper. Based on ram travel: a) Horizontal shaper. b) Vertical shaper. Based on the table design: a ... shaper. b) Universal shaper. Based on cutting stroke. a) Push cut type. b) Draw cut type.
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1 answer
asked
Jan 2, 2021
by
anonymous

List the types of filters.
Last Answer : Types of filter are as follows: 1. Shunt Capacitor filter (C filter) 2. Series Inductor filter (L filter) 3. LC filter 4. π filter (CLC filter)
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74 views
1 answer
asked
May 16, 2020
by
anonymous

Define earthing. State its types.
Last Answer : Definition of earthing: * Earthing means connecting the metal body of electrical device to the general mass of earth by a wire of negligible resistance. OR * Earthing means connecting the metal body of ... ii) Pipe type earthing iii) Rod type earthing iv) Strip earthing v)Water main earthing
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120 views
1 answer
asked
May 7, 2020
by
anonymous
