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For the following questions answer them individually
A radio transmitter is an equipment:
For receiving R.F. signals
For generating modulated radio frequency waves
For amplifying R.F. signals
For generating carrier waves
Negative feed back :
Increases the gain of amplifier
Decreases the gain of amplifier
Increase the gain and band width of the amplifier
Decreases the gain and increases the band width of the amplifier
Three phase step-up transformer installed at power house, just before commencement of transmission line, have:
DELTA-DELTA connection
STAR-STAR connections
STAR-DELTA connections
DELTA-STAR connections
When biased correctly, a zener diode:
Acts as a fixed resistance
Has a constant voltage across it
Has a constant current passing through it
Never overheats
Induced draft fans are located at:
The top
The bottom
In the middle part
Can be anywhere, in the cooling tower
In a thyristor, the magnitude of anode current will:
Increase if gate current is increased
Decrease if gate current is decreased
Increase if gate current is decreased
Not change with any variation in gate current
Brass is an alloy of :
Copper and Zinc
Lead and Zinc
Zinc and Tin
Tin and Lead
When cells are arranged in parallel:
Current capacity increases
Current capacity decreases
The e.m.f. increases
The e.m.f. decreases
A capacitor opposes:
Change in current
Change in voltage
Both change in current and voltage
None of these
AC supply system compared to DC supply system has the advantage:
Power factor
Reactive elements
Voltage drop
Low cost of switching
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