ECET EEE 2010-10

1. When a high resistance is connected in parallel with a low resistance the combined resistance is

A) Higher than the low resistance
B) Lower than the higher resistance
C) Between the value of high and low resistance
D) less than the lower resistance

Answer : less than the lower resistance
Explanation:-

2. If a series circuit consists of three resistors and a battery which of the following statement is always true?

A) The voltage drop across each resistor is the same
B) The current through each resistor is the same
C) The power dissipated in each resistor is the same
D) The energy consumtion in each resistor is the same

Answer : The current through each resistor is the same
Explanation:-

3. Regarding Nortons equivalent which of the following is not correct

A) Nortons equivalent is the voltage equivalent of the network
B) Nortons equivalent is the current equivalent of the network
C) Nortons equivalent to resistance is the same as the thevenins equivalent resistance
D) The load is connected in parallel to the Nortons equivalent resistance and Nortons equivalent source

Answer : Nortons equivalent is the voltage equivalent of the network
Explanation:-

4. What is meant by permeabilty

A) strength of a permanent magnet
B) strength of an electromagnet
C) The repulsion of two similar poles
D) The conductivity of a material for the magnetic flux

Answer : The conductivity of a material for the magnetic flux
Explanation:-

5. Time constant for an R-L series circuit is given by

A) R/L
B) I/(RL)
C) RL
D) L/R

Answer : R/L
Explanation:-

6. The direction of induced emf is given by

A) Flemimg's right hand rule
B) Fleming's left hand rule
C) Kirchoff's voltage law
D) Kirchoff's current law

Answer : Flemimg's right hand rule
Explanation:-

7. If the frquency of the pure inductive circuit is halved, then the current of the circuit will be

A) same
B) doubled
C) halved
D) fourtimes

Answer : Doubled
Explanation:- I=(V/Z) Z=Xl
f2=f1/2
Xl2=Xl1/2
Z2=Z1/2
I2=2V/Z2

8. The maximum and minimum values of power factor can be

A) 1 and 0
B) +1 and -1
C) +1 and 5
D) +5 and -5

Answer : 1 and 0
Explanation:-

9. Eddy currents in a core can be minimised by

A) decreasing the flux density
B) laminationg the core
C) reducing the core volume
D) Decreasing the number of turns

Answer : Laminationg the core
Explanation:-

10. In a periodic table, the elements are arranged in order of increasing

A) atomic weight
B) molecular weight
C) atomic number
D) both 1 and 2

Answer : Atomic number
Explanation:-