DieselShip's Online Content Library

Q1. a) Name the factors the resistance of a conductor depends on? (4)

b) Describe three types of resistive strain gauge. (6)

c) Explain the working of a strain gauge used for pressure measurement. (6)

Q2. a) Distinguish between primary and secondary cells. (4)

b) Explain Internal resistance in a battery. (4)

c) What are the factors affecting internal resistance of a battery. (8)

Q3. a) Compare direct current with alternating current. (6)

b) With respect to alternating voltage wave form, explain the following terms: time period, frequency, Cycle, Peak Value, Peak to peak value. (10)

Q4. a) Sketch and describe moving iron and moving coil instruments for measuring current. (10)

b) How the moving iron instrument can be used to measure voltage? (6)

Q5. Write a short note on any two of the following:

a) Voltmeter.

b) Multi-meter.

c) Megger. (16)

Q6. The resistors 5Ω, 7Ω, and 8Ω are connected in series across a voltage source of 10 V. Find the voltage drop across each resistor and also the total power consumed by the circuit. (16)

Q7. Ten thousand cubic millimeters of copper are

a) Drawn into a wire 100 metres long,

b) Rolled into a square sheet of 100 mm side. Find the resistance of the wire and the resistance between opposite faces of the plate, if the resistance of the copper is 17 μΩmm or 1.7 x 10-8 ohms-metres. (16)

Q8. Find the p.d between A-B and B-C shown in the figure below. (16)

Q9. The following are the results of measurements taken at intervals over a half cycle of alternating voltage:

Time (t milliseconds)
0
0.45
0.95
1.5
2.1
2.5
3.1
3.9
4.5
5.0

Voltage (V volts)
0
20
36
40
37.5
33
32
31
20
0
Calculate the R.M.S value, average value and frequency of the wave. (16)