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Electronics and Communication Engineering - Electronic Devices and Circuits

Exercise : Electronic Devices and Circuits - Section 9
16.
The purpose of earthing electric appliances is
to provide safety against shock
to ensure that appliance works satisfactorily
to ensure that appliance gets full voltage
all of the above
Answer: Option
Explanation:

Earthing prevents electric shock because the fault current flows through the earth conductor and not through body.

17.
Three impedances (3 + j 4) Ω each are connected in star. The impedances of equivalent delta circuit will be
3 - j 4 Ω each
9 + j 12 Ω each
9 - j 12 Ω each
3 + j 4, 3 - j 4 and 4 - j 3 Ω
Answer: Option
Explanation:

18.
Find Vth in the circuit
100 V
10 V
0 V
5 V
Answer: Option
Explanation:

There is no independent source hence VTH = 0.

19.
A heater is rated at 230 V, 5 A AC. Then
both the current and voltage are peak values
both the current and voltage are rms values
the current is peak value and voltage is rms value
the current is rms value and voltage is peak value
Answer: Option
Explanation:

In heaters, the ratings are specified in terms of rms values.

20.
KCL is a statement of principle of conservation of energy.
True
False
Answer: Option
Explanation:

KCL is restatement of principle of conservation of charge.

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