Answer / thwosif_emrson

By using a LDR needs no manual operation for switching ON
and OFF. When there is need of light. It detects itself
weather there is need for light or not. When darkness rises
to a certain value then automatically street light is
switched ON.

Answer / vijay

LDR=LIGHT DEPENDENT RESISTOR
THE ABBREVIATION ITSELF STATES THAT LIGHT GLOWS DEPENDING
UPON THE VALUE OF RESISTANCE.
LDR IS CONNECTED IN PARALLEL TO THE LIGHT.
IF RESISTANCE IS MORE LIGHT GLOWS MORE EFFECTIVELY
IF RESISTANCE IS LOW LIGHT INTENSTITY WILL BE VERY LESS.

4-Why we measure the insulation resistance of main core and frame in spite of that must be connected with ground before energize the transformer?

3 Answers  

---

how DC motor operating in detail .pls any one guide me .iam not clear idea about that .thank u

2 Answers  

---

what is different between phase and netural

0 Answers  

---

fuel-air ratio in a petrol engine fitted with suction carburettor,operating with dirty air filter as compared to clean filter will be

0 Answers   NIC,

---

why nearly all the voltage levels are in the multiples of 11 like 3.3 ,6.6 ,33 ,11 kv.....

8 Answers   Suzlon,

---

What is the test block protection relay if any body know plz explained

0 Answers  

---

When steam condenses and becomes water at the same temperature, the specific heat for the process in kJ/kg k is

0 Answers   Caterpillar,

---

11KW Delta motor is taking about 44Amps in star and goes upto 70Amps in delta and trips OFF. The rated current is 26Amps. Application is for the blower. The motor takes ( no load without coupling impller ) only 2.5A and 5Amps in star & delta starter test.Need to know why its taking high current.

10 Answers   Pfizer,

---

how to claculate the ups load in KVA pls give the if any fourmoul?

4 Answers  

---

one 60KVA UPS how can full load current tell me us formulas

1 Answers   Wipro,

---

What is switch disconnector fuse?

1 Answers  

---

Can 2 nos. of 1 ton split ac be used through a 20 am supply meter?

3 Answers  

---