46) The current in the circuit shown below is

1) 2A

2) 8A

3) 4A

4) 6A

**Ans: 2A**

47) Two capacitors of capacitance 8 µF and 2µF are charged to attain a potential of 80 v and 20 v respectively. If the two capacitors are connected in parallel the common potential across the parallel combination

1) 64 V

2) 16 V

3) 32 V

4) 48 V

**Ans: 64 V**

48) A

**sinusoidal alternating voltage of 50 Hz has an rms value of 200 V. then the equation for the instantaneous value of voltage is given by**1) V= 200 sin 100 πt

2) V = 252 sin 50 πt

3) V = 282 sin 100 πt

4) V = 200 sin 50 πt

**Ans: V = 282 sin 100πt**

49) To operate a device with an impedance of 5Ώ , a step down transformer is used. The primary draws a current of 0.5A. If the Voltage across the secondary is 20V, the voltage across the primary is

1)100 V

2) 200 V

3) 50 V

4) 40 V

**Ans: 200 V**

50) For long distance power transmission, power dissipation in the transmission line can be minimized by sending power at

1) High voltage and low current

2) High voltage and high current

3) Low voltage and high current

4) Low voltage and low current

**Ans: High voltage and low current**

51) Under burnt brick will be

1) Brittle

2) Soft

3) Very hard

4) Of high strength

**Ans: soft**

52) To give yellow colour to cement, the following material is added

1) Iron oxide

2) Chromium oxide

3) Cobalt oxide

4) All the above three oxides

**Ans: iron oxide**

53) Mortar with bulk density of over 2200 kg/m^3 is called

1) X-ray shielding mortar

2) Sound absorbing mortar

3) Packing mortar

4) Fire resistant mortar

**Ans: sound absorbing mortar**

54) A load of 4.5 kN is to be lifted using a steel wire. The yield stress is 240 MN/m^2. If the factor of safety adopted is 3, the allowable stress is

1) 800 n/cm^2

2) 80 N/ mm^2

3) 80 N/cm ^ 2

4) 8 n/m^2

**Ans: 80 N/mm^2**

55) The portion of the road between the edge of the carriage way and the edge of the road formation is called

1) Shoulder

2) Roadway

3) right of the way

4) Width of roadway

**Ans: shoulder**

56) The pH of a solution is 9.0. Its hydrogen ion concentration is increased 100 times, the solution will then be

1) More basic

2) More acidic

3) Neutral

4) Of the same acidity

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