**DC machines Important MCQ type questions For GATE**

**Q1. Capacity of a dry cell, is**

- more when it supplies current continuously.
**more when it supplies current intermittently.**- not affected by the type of discharge.
- none of the above.

**Q2. The emf of primary cell depends upon the**

- physical dimensions.of a cel.
- nature of electrolyte.
- nature of electrode.
**both (b) and (c).**

**Q3. Maxwell's loop current method of solving electrical networks**

- uses branch currents.
**utilizes Kirchhoff s voltage law.**- is cofined to single-loop circuits.
- is a network reduction method.

**Q4. Superposition theorem is applicable for**

**Linear circuits only.**- Non-linear circuits only.
- Linear and non-linear circuits both.
- None of these.

**Q5. Nodal analysis is based on**

**KCL.**- KVL
- both
- law of conservaion of energy.

**Q6. In nodal analysis, if there are N nodes in the circuit, then how**

**many equations will be written to solve the network?**

**N-1**- N+1
- N
- N-2

**Q7. Point out the wrong statement. In the node voltage technique of**

**solving networks, choice of a reference node does not**

**affect the operation of the circuit.**- change the voltage across any element.
- after the pd between any pair of nodes.
- affect the voltages of various nodes.

**Q8. Consider the following statements on mesh and nodal analysis:**

- Networks that contain many series-connected elements,voltage sources or meshes having common current sources(super meshes) are more suitable for mesh analysis than for nodal analysis.
- Networks with parallel connected elements, current sources or nodes connected by voltage sources are more suitable for nodal analysis than mesh analysis.
- A circuit with fewer nodes than meshes is better analysed using mesh analysis, while a circuit with fewer meshes, than nodes is better analyzed using nodal analysis.

**Which of the statements given above are correct?**

**1 and 2 only**- 2 and 3 only.
- 1 and 3 only.
- 1,2 and 3

**Q9. while thevenizing a circuit between two terminals, vth is equal**

**to**

- short-circuit terminal voltage.
**open-circuit terminal voltage.**- net voltage available in the circuit.
- emfof the battery nearest to the terminals.

**Q10. while determining Rth of a circuit**

- voltage and current sources should be left as they are.
**all sources should be replaced by their source resistances.**- all independent current and voltage sources are short-circuited.
- none of the above.

**Q11. Which of the folowing statements is/are correct?**

- Norton's equivalent resistance is the same as Thevenin's equivalent resistance RTH
- Norton's equivalent is the curent equivalent of the network.
- The load is connected in parallel to the Norton's equivalent resistance and Norton's equivalent current source,
**all of the above.**

**Q12. A human nerve cell has an open-circuit voltage of 80 mV and it**

**can deliver a current of 5 nA through a 6 M ohm load. What is the**

**maximum power available from the cell?**

**0.16 nW**- 1.6 nw
- 1.6 W
- 1.6 pW

**Q13. A load is connected to an active network. At the terminals to which**

**the load is connected, R= 102 and Vh60 V. Then maximum power supplied to the load is**

- 360 w
**60 W**- 90 W
- 10 W

**Q14. For a linear network containing generators and impedances, the**

**ratio of the voltage to the current produced in other loop is the**

**same as the atio of voltage and cunent obtained if the positions of**

**the voltage source and the ammeter measuring the current are**

**interchanged. The network theorem is known as**

- Millman's theorem.
- Norton's theorem.
- Tellegen's theorem.
**Reciprocity theorem.**

**Q15. Consider the two circuits I and II shown in the given figures**

**Which of the following statements regarding the current flowing**

**through the ammeters A and Aa is correct?**

**The currents in A and A are of the same value and equal 0.25 A.**- The currents in A and A, are respectively 0.25 A and 2.5 A
- The curent in both the ammeters is of the same vaiue and equals 2.5A.
- The currents in A, and A2 are respectively 2.5 A and 0.25 A.

**Q16. In a balanced Wheatstone bridge, if the positions of detector and source are interchanged, the bridge will still remain balanced. This**

**inference can be drawn from**

**reciprocity theorem**- duality theorem
- compensation theorem
- equivalence theorem

**Q17. For a Ï€ network with admittances Ya and Yb are shunt arms and Yc as the series arm, the values of y11, Y12 and y22 will be**

**respectively**

- (Ya+Yc) ,Yb, Yc
**(Ya + Yc), -Yc ,( Yb+Yc)**- Ya , (Yb+Yc) , -Yc
- Ya, -Yc, Yb

**Q18. For a two-port symmetrical bilateral network, if A = 3 and**

**B=1ohm , the value of parameter C will be**

- 4 s
- 6 s
**8 s**- 16 s

**Q19. Pole of a network is a frequency at which**

- network function becomes zero.
**network function becomes infinite.**- (network function becomes unity.
- none of these.

**Q20. A pole of driving point admittance function implies**

- zero current for a finite value of driving voltage.
**zero voltage for a finite value of driving current.**- an open circuit condition.
- none of these

**Q21. The lowest and the highest critical frequencies of an R-L driving-**

**point impedance are, respectively**

**a zero, a pole. .**- a zero, a zero.
- a pole, a pole.
- a pole, a pole.

**Q22. The first and the last critical frequencies (singularities) ofa driving**

**point impedance function of a passive network having two kinds**

**of elements, are a pole and a zero respectively. The above property**

**will be satisfied by**

- RL network only
**RCnetwork only**- LCetwork only
- RC as well as RL networks

**Q23. The first and last critical frequency of an RC-driving point**

**impedance function must respectively be**

- a zero and a pole.
- a zero and a zero.
- a pole and a pole.
**a pole and a zero.**

**Q24. The poles and zeroes of an all-pass network are located in which**

**part of the s-plane?**

- Poles and zeroes are in the right half s-plane.
- Poles and zeroes are in the left half s-plane.
- Poles in right half and zeroes in left half of s-plane.
**Poles in the left half and zeroes in right half of s-plane.**