**DC Motor MCQ Questions Answers Electrical Engineering (Direct Current)**

1) A d.c circuit usually has ___________ as the load.

a) resistance

b) inductance

c) capacitance

d) both inductance and capacitance

2) An external resistance R is connected to a cell of internal resistance r. The maximum current flows in the external resistance when

a) R>r

b) R >r

c) R=r

d) any other value of R

3) Given three equal resistances. How many combinations of these three resistances can be made?

a)three

b) four

c) five

d) two

4) Kirchhoff’s voltage law deals with

a) conservation of energy

b) conservation of charge

c) conservation of momentum

d) conservation of angular momentum

5) An ordinary dry cell can deliver a current of about

a) 3 A

b) 2 A

c) 1/8 A

d) none of the above

6) For the circuit shown in Fig. 2.63, the power dissipated in G_{1} is

a) 50 mW

b) 25 mW

c) 100 mW

d) 125 mW

7) The power dissipated in a resistor in terms of its conductance G and current I through it is

a) I^{2}G

b) I^{2}/G

c) G^{2}/I

d) none of the above

8) The total conductance of two 0.1 conductances in series is

a) 0.5 S

b) 0.2 S

c) 1 S

d) 0.05 S

9) Conductance can be

a) positive only

b) negative only

c) positive or negative

d) information incomplete

10) A charge of 10mC flows through a cross section 2.5 mm2 normally in 2 seconds. The current is

a) 25 mA

b) 5 mA

c) 20mA

d) 4Ma

11) When a d.c battery of e.m.f. E and internal resistance r delivers maximum power to an external resistance R, the ratio r/R is

a) 1:1

b) 2:1

c) 1:2

d) 1:1/2

12) A 200W and 100 W bulb both meat for operation at 220 V are connected in series. When connected to a 220 V supply, the power consumed by them is

a) 66 W

b) 33 W

c) 100 W

d) 300 W

13) In the above question, if the galvanometer is open circuited, the current in the various resistors will

a) not change

b) decrease

c) increase

d) cannot say