Technical Questions for ALP & Tech. Part-7
Technical Questions for ALP & Tech. Part-7
Trade specific Question
This Test is very much helpful for Assistant Loco Pilot and Technician written Exams. This Test is based on Previous Loco Pilot Exams.
Useful for all Railway Technical Exams [Like ALP, Technician, JE and SSE also]
1. In an electric iron, the wire of Nichrome is used because:
(a) It has higher melting point and high value of specific resistance
(b) It can be easily drawn into wires
(c) It is not oxidized easily when heated in air
(d) All of the above
2. A current in a circuit having constant resistance is tripled. How does this affect the power dissipation?
(a) It becomes 8 times
(b) It becomes 5 times
(c) It becomes 10 times
(d) It becomes 9 times
3. Special silicon steel is used for laminations in power transformer to reduce:
(a) Eddy current losses
(b) Hysteresis losses
(c) Copper losses
(d) Both (a) and (b)
4. An inductor may store energy in:
(a) Its electric field
(b) Its coils
(c) Its magnetic field
(d) Both in magnetic and electric fields
5. The working of a dynamo is based on the principle of:
(a) Heating effect of current
(b) magnetic effect of current
(c) Chemical effect of current
(d) Electromagnetic induction
6. In an a.c. circuit the current
(a) Is in phase with the voltage
(b) Leads the voltage
(c) Large the voltage
(d) Any of the above
7. Which of the following quantities remains constant in a step-down transformer?
(a) Current
(b) Voltage
(c) Power
(d) None of these
8. Supper high-frequency electromagnetic waves are used in Radar. Their frequency range is:
(a) 3000 to 30000 MHZ
(b) 2000 to 20000 MHZ
(c) 30000 to 60000 MHZ
(d) None of these
9. When an impurity is doped into an intrinsic semiconductor, the conductivity of the semiconductor:
(a) Decreases
(b) Becomes zero
(c) Remains same
(d) Increases
10. The resistivity of semiconductor depends on:
(a) Shape of semiconductor
(b) Length of semiconductor
(c) Atomic nature of semiconductor
(d) None of these
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