BHEL Model Questions 2

1.      What percentage of carbon is present in pig iron?
Ans. 4.5 to 6%.

2.      Water is available at 10m height. What is the pressure available?
Ans: Pressure=Density*g*Height;
p=1000*9.81*10;
p=98100N/m2.

3.      What will happen if the speed of the centrifugal pump doubles?

4.      The unit eV is widely used in_____
Ans. Nuclear and atomic physics.

5.      What will happen to the resistance, when the diameter of the conductor is doubled?

6.      The power consumed by a electrical device is 1000W at 250V, What is the resistance in the device?
Ans. Power= Voltage*current,
        Current=Power/Voltage,
        Current,I=1000/250=4 amps.
        V=IR,
        Therefore R=250/4=62.5 ohms.

7.      Why DC current is not used in transformer?

8.      On what principle the sonar/ radar work?

9.      Bending moment diagram for the UDL is in what shape?

10.  Function of the distributor in petrol vehicles?
Ans. Spark timing.