1. A transistor with h_ie = 1.5 k and h_fe = 75 is used in an emitter follower circuit where R1 and R2 are used for normal biasing . Approximate value of it?s current amplification is

a) 75                 b) 76                    c) 75/76                       d) -75

2. Which of the following statement is true about two wattmeter method for power measurement in three phase current ?

a) power can be measured using two wattmeter method only for star connected three phase circuits.

b) when two meter show indentical readings, in the power factor is 0.5.

c) when power factor is unit, one of the wattmeter reads zero

d) when the reading of the two wattmeters are equal but of opposite sign, then the power factor is zero ?

3. The lowest TM mode in a rectangular waveguide of cross section a x b with a>b will be-

a) TM₀₁                        b) TE₁₀                        c) TM₁₁₂                         d) TE₁₁

4. Power output increase in a class-c amplifier-

a) If the conduction angle decrease

b) If the conduction angle increase

c) Are not governed by the conduction angle

d) None of the above

5. Why DC current is not used in transformer?

6. A mass of 100kg is falling from a height of 1m and penetrates the sand to 1m. what is the resistance force of the sand?

7. When a capacitance transducer has two plates of area 5cm² each, separated by an air gap of 2mm than the displacement sensitivity in pf/cm due to gap change would be ?

a) 11.1                  b) 44.2                   c) 52.3                        d) 66.3

8. Two cars travel in the same direction at 40km/hr at a regular distance. A car comes in the opposite direction at 60km/hr. It meets each car in a gap of 8 seconds. What is the distance between the two cars?

9. What percentage of carbon is preset in pig iron.

Answer : 4.5 to 6%

10. How are tungsten and sintered composite materials are machined?

Answer : Electro Discharge Machining, EDM