AP ECET EEE 2018-1

1. A network contains four resistors in series across an ideal voltage source. If the values of all the resistors are doubled then the voltage across each resistor will ________

A. be increased by 2 times
B. be increased by 4 times
C. be decreases by 2 times
D. not change

Answer : D. not change
Explanation:-

2. If each branch of a delta circuit has resistance of 1.732R,then each branch of its equivalent star circuit has resistance of ______

A. 3R
B. 1.732R
C. 0.577R
D. 0.333R

Answer : C. 0.577R
Explanation:-

3. Thevenins equivalent circuit consists of

A. A voltage source in parallel with resistance
B. A voltage source in series with resistance
C. A current source in parallel with resistance
D. A current source in series with resistance

Answer : B. A voltage source in series with resistance
Explanation:-

4. Which of the following statement is correct?

A. Resistor is an active element
B. Inductor is an active element
C. Voltage source is a passive element
D. Current source is an active element

Answer : D. Current source is an active element
Explanation:-

5. The mutual inductance between two coupled coils with self inductance L1=9H and L2=4H with a coefficient of coupling of 0.5 is

A. 3H
B. 6H
C. 18H
D. 36H

Answer : A. 3H
Explanation:-

6. If the distance betwen two charges is doubled, the force between them

A. increases two times
B. decreases two times
C. increases four times
D. decreases four times

Answer : D. decreases four times
Explanation:-

7. The heat produced in a current carrying conductor is

A. IRT
B. I^2RT
C. IR^2T
D. IRT^2

Answer : B. I^2RT
Explanation:-

8. If the number of conductors and speed of a lap wound DC generator is doubled then the generated emf will be

A. remains same
B. double the former value
C. four times the former value
D. Eight times the former value

Answer : C. four times the former value
Explanation:-

9. A 4pole,DC wave wound generator runs at 600 rpm. The flux per pole is 0.015 wb and generator no load voltage is 240V . The number of conductors are

A. 600
B. 800
C. 1000
D. 1200

Answer : B. 800
Explanation:-

10. The simplest way to shift load from one DC shunt generator running in parallel with another is by

A. Adjusting their field rheostats
B. Inserting resistance in their armature circuits
C. Adjusting the speeds of their prime movers
D. using equalizer connections

Answer : A. Adjusting their field rheostats
Explanation:-