The electrical energy required to heat a bucket of water to a certain temperatur

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Question
The electrical energy required to heat a bucket of water to a certain temperature is 2 kWh. If heat losses, are 25%, the energy input is
Options
A. 2.67 kWh
B. 3 kWh
C. 2.5 kWh
D. 3.5 kWh

Correct Answer

2.67 kWh

Explanation

Since 25% of input is lost, 0.75 Input = 2 or input =

The electrical energy required to heat a bucket of water to a certain temperature is 2 kWh. If heat

Networks Analysis and Synthesis problems

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1. When a current source I is suddenly connected across a two terminal relaxed RC circuit at time t = 0, the voltage across the current source is shown in figure. The RC circuit is
Options
A. a series combination of R and C
B. a parallel combination of R and C
C. a series combination of R and parallel combination of R and C
D. a pure capacitor

3. The current rating of a cable depends on
Options
A. length of cable
B. diameter of cable
C. both length and diameter of cable
D. none of the above

4. In the circuit of figure, the switch is closed at t = 0. At t = 0⁺ the current through C is
Options
A. 4 A
B. 2.5 A
C. 3.1 A
D. 0

5. In an RC series circuit R = 100 ? and X_C = 10 ?. In this circuit
Options
A. the current and voltage are in phase
B. the current leads the voltage by about 6�
C. the current leads the voltage by about 84�
D. the current lags the voltage by about 6�

6. The current wave shape shown in figure (1) is applied to a circuit element. The voltage across the element is shown in figure (2). The element is
Options
A. R
B. L
C. C
D. Semiconductor

7. In the figure shown, A₁, A₂, A₃ are identical Ammeters. If A₁ and A₃ read 5 and 13 A respectively, reading of A₂ will be
Options
A. 8
B. 13 A
C. 18
D. 12 A

8. In an R-C series circuit excited by a voltage E, the charge across capacitor at t = 0⁺ is
Options
A. 0
B. CE
C. CE (1 - e^-t/RC)
D. none of the above

9. A two branch parallel circuit has a 20 ? resistance and 1 H inductance in one branch and a 100 ?F capacitor in the second branch. It is fed from 100 V ac supply, at resonance, the input impedance of the circuit is
Options
A. 500 ?
B. 50 ?
C. 20 ?
D. 5 ?

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