Advertisements
Advertisements
प्रश्न
State true or false:
The frequency of AC is 50 Hz.
विकल्प
True
False
उत्तर
The frequency of AC is 50 Hz. - True
APPEARS IN
संबंधित प्रश्न
What type of generator is used at Power Stations?
What change should be made in an a.c. generator so that it may become a d.c. generator?
What is the function of brushes in an electric generator?
Why are Thermal Power Stations usually located near a river?
Complete the following sentence:
A generator with commutator produces ............... current.
Explain the principle of an electric generator.
A d.c. generator is based on the principle of:
(a) electrochemical induction
(b) electromagnetic induction
(c) magnetic effect of current
(d) heating effect of current
The frequency of alternating current (a.c.) supply in India is:
(a) 0 Hz
(b) 50 Hz
(c) 60 Hz
(d) 100 Hz
State whether the following statement are true of false:
A wire with a green insulation is usually the live wire.
State one advantage of using a.c. over d.c.
Observe the figure and answer the following questions.
a) Identify the machine shown in figure.
b) Write a use of this machine.
c) How transformation of energy takes place in this machine.
Draw a neat labeled diagram of an A.C. generator
The given figures 1 to 3 show the working of a simple A.C. generator. Study the diagrams and answers of the following questions.
(i) State and explain the principle underlying the working of a simple generator.
(ii) Where is the loop of wire placed?
(iii) What happens when the loop is rotated?
(iv) Indicate the direction of the current flow through the wire for the first half of the turn (in first figure). Name and state the rule used in finding the direction of the current.
(v) Indicate the direction of the current for the case shown in second figure.
(vi) Indicate the direction of current in the outer circuit (i.e., electric bulb) in first and third figure.
(vii) What type of current is shown in the above diagrams? Explain.
Observe the figure and write the answers to the questions asked.
- The construction shown in the figure is of which device?
- Explain the principle on which this device works.
- Write any three uses of this device.
Draw a neat diagram of an AC generator and explain its working.
To convert an AC generator into DC generator ____________.
