  # ISRO Scientist or Engineer Electrical 2014

Instructions

For the following questions answer them individually

Question 1

# A Meter has full scale deflection of $$90^\circ$$ at a current of 1A. The response of the meter is square law. Assuming spring control, the current for a deflection at $$45^\circ$$ will be Question 2

# A Single-phase Energy meter is operating on 230 V, 50 Hz supply with a load of 20 A for two hours at UPF. The meter makes 1380 revolutions in that period. The meter constant is Question 3

# In case of power measurements by two wattmeter method in a balanced 3-phase system with pure inductive load Question 4

# It is required to measure temperature in the range of $$1300^\circ C$$ to $$1500^\circ C$$. The most suitable thermocouple to be used as transducer would be Question 5

# Which dc motor will have highest percentage increase in input current for given percentage increase in torque Question 6

# In a three phase delta transformer, one phase burns up. The transformer will supply Question 7

# In an auto transformer, power is transferred through Question 8

# Buchholzrelay is a Question 9

# In Scott connection, if the ratio of the main transformer is k, then the teaser transformer has transformation ratio of Question 10

# With core type transformers, the limbs are stepped so as to OR