ECET EEE 2010-8

1. The voltage required to produce arc in arc welding in the range of

A) 20-30v
B) 100-200v
C) 50-100v
D) 400

Answer : 50-100v
Explanation:-

2. In case of coreless type furnace, the charge should be in

A) Molten state
B) Solid state
C) Gaseous state
D) Either 1 or 2

Answer : Solid state
Explanation:-

3. Choke is provided in fluorescent tube

A)To provide stability to the arc in the tube
B) To avoid radio interference
C) To improve power factor
D) To estimate corona effect

Answer : To provide stability to the arc in the tube
Explanation:-

4. During starting, the train resistance

A) is zero
B) increases linearly with speed
C) follows an exponential law
D) increases as square of the speed

Answer :
Explanation:- It depends on the weight of Locomotive

5. In dc series traction motor operating on the linear portion of magnetization curve of core material speed N and armature current I are related as

A) N is directly proportional to I
B) N is directly proportional to I2
C) N is inversly proprtional to I
D) N is inversly proportional to square of I

Answer : N is directly proportional to I2
Explanation:-

6. In traction system high torque should be produced during

A) starting period
B) running period
C) coasting period
D) notching period

Answer : starting period
Explanation:-

7. Shunt motors are not suitable for traction duty because

A) Torque developed varies linearly as current
B) speed control is not easy
C) low efficiency
D) produces low tractive effort

Answer : Torque developed varies linearly as current
Explanation:-

8. Area under speed-time curve represents

A) Average speed
B) Average Acceleration
C) Total distance travelled
D) Free running

Answer : Total distance travelled
Explanation:-

9. The friction at the track is proportional to

A) speed
B) square of speed
C) cube of speed
D) 1/(square of speed)

Answer : 1/(square of speed)
Explanation:-

10. The total flux required in any lighting scheme depends inversly on

A) surface area
B) space-height ratio
C) illumination
D) co-efficient of utilization

Answer :
Explanation:-