National Transmission & Dispatch Company NTDC Test Sample Paper for Junior Engineer Electrical (Solved)

 

National Transmission & Despatch Company NTDC Test Sample Paper for Junior Engineer Electrical (Solved) 

1. The S.I. unit of power is
(a) Henry
(b) coulomb
(c) watt
(d) watt-hour
Ans: c

2. Electric pressure is also called
(a) resistance
(b) power
(c) voltage
(d) energy
Ans: c

3. The substances which have a large number of free electrons and offer a low resistance are called
(a)     insulators
(b)     inductors
(c) semi-conductors
(d) conductors
Ans: d

4. Out of the following which is not a poor conductor?
(a) Cast iron
(b) Copper
(c) Carbon
(d) Tungsten
Ans: b

5. Out of the following which is an insulating material?
(a) Copper
(b) Gold
(c) Silver
(d) Paper
Ans: d

6. The property of a conductor due to which it passes current is called
(a) resistance
(b) reluctance
(c) conductance    
(d) inductance
Ans: c

7. Conductance is reciprocal of
(a) resistance
(b) inductance
(c) reluctance
(d) capacitance
Ans: a

8. The resistance of a conductor varies inversely as
(a) length
(6) area of cross-section
(c) temperature    
(d) resistivity
Ans: b

9. With rising in temperature the resistance of pure metals
(a) increases
(b) decreases
(c) first increases and then decreases
(d) remains constant
Ans: a

10. With rising in temperature the resistance of semiconductors
(a)     decreases
(b)     increases
(c) first increases and then decreases
(d) remains constant
Ans: a

11. The resistance of a copper wire 200 m long is 21 Q. If its thickness (diameter) is 0.44 mm, its specific resistance is around
(a) 1.2 x 10~8 Q-m
(b) 1.4 x 10~8 Q-m
(c) 1.6 x 10″”8 Q-m
(d) 1.8 x 10″8 Q-m
Ans: c

12. Three resistances of 10 ohms, 15 ohms, and 30 ohms are connected in parallel.
The total resistance of the combination is
(a) 5 ohms
(b) 10 ohms
(c) 15 ohms
(d) 55 ohms
Ans:

13. An instrument that detects electric current is known as
(a) voltmeter
(b) rheostat
(c) wattmeter
(d) galvanometer
Ans: d

14. In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the
resistor is
(a) 33 V
(b) 66 v
(c) 80 V
(d) 132 V
Ans: b

15. A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is
(a) 400 Q
(b) 600 Q
(c) 800 Q
(d) 1000 Q
Ans: c

16. The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other?
(a) 18 Q
(b) 36 Q
(c) 48 Q
(d) 64 Q
Ans: b

17. Four wires of the same material, the same cross-sectional area, and the same length when connected in parallel give a resistance of 0.25 Q. If the same four wires are connected in series the effective resistance will be
(a) 1 Q
(b) 2 Q
(c) 3 Q
(d) 4 Q
Ans: d

18. A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms
respectively. The current in each branch is
(a) 6.4 A, 6.9 A    
(b) 6.4 A, 9.6 A
(c) 4.6 A, 6.9 A    
(d) 4.6 A, 9.6 A
Ans: b

19. Current velocity through a copper conductor is
(a) the same as propagation velocity of electric energy
(b) independent of current strength
(c) of the order of a few ^.s/m
(d) nearly 3 x 108 m/s
Ans: c

20. Which of the following material has a nearly zero temperature coefficient of resistance?
(a) Manganin
(b) Porcelain
(c) Carbon
(d) Copper
Ans: a

21. You have to replace the 1500 Q resistor in the radio. You have no 1500 Q resistor but have several 1000 Q ones which you would connect
(a) two in parallel
(b) two in parallel and one in series
(c) three in parallel
(d) three in series
Ans: b

22. Two resistors are said to be connected in series when
(a) the same current passes in turn through both
(b) both carry the same value as current
(c) total current equals the sum of branch currents
(d) a sum of IR drops equals the applied e.m.f.
Ans: a