RRB JE Stage II exam is scheduled to be conducted from 28th August to 1st September2019. The overall merit for the selection will be made on the basis of the marks scored in stage II, so candidates need to prepare thoroughly for the second stage. To help the aspirants, Adda247 has come up with a study plan in which we will provide you daily quizzes of all technical subjects. The below quiz will be helpful for the candidates who opted Electrical as the exam group in RRB JE stage II.
Q1. The breakdown voltage of a cable depends on
(a) presence of moisture
(b) working temperature
(c) time of application of the voltage
(d) all of the above
The breakdown voltage of a cable depends on presence of moisture, working temperature, time of application of the voltage.
Q2. Domestic appliances are connected in parallel across a.c. mains because ……….
(a) it is a simple arrangement
(b) operation of each appliance becomes independent of the other
(c) appliances have same current ratings
(d) this arrangement occupies less space
Sol. Home appliances are connected in parallel to provide equal supply voltage to all. secondly, if one appliance is removed it would not affect the condition of others. in series if one appliance is open the complete circuit would be open.
Q4. Fig. shows voltmeter-ammeter method of measuring the value of resistance R. This method is used to measure R if its value is
(a) very low
(b) very high and moderate
(c) cannot say
(d) none of above
Q5. In a semiconductor, the energy gap between valence band and conduction band is about………..
(a) 5 eV
(b) 10 eV
(c) 15 eV
(d) 1 eV
In a semiconductor, the energy gap between valence band and conduction band is about 1eV
Q7. Which power plant has minimum operating cost?
(a) Hydroelectric power plant
(b) Thermal power plant
(c) Nuclear power plant
(d) Gas Turbine Power Plant
Sol. Hydroelectric power plant has lowest running cost because it does not need any fuel and can be operated by few number of persons. Nuclear gas and thermal power plant require fuels also the handling cost of fuels is added with the total cost.
Q8. Which of the following least affect the cost of electricity produced in thermal power plant?
(a) Cost of fuel
(b) Cost of transportation
(c) The load factor
(d) Salaries of higher officials
S8. Ans. (d)
Sol. Change in fuel cost by 20% main cause about 8% variation in total cost per KWh generated. Cost of transportation and the load factor changes and also cause variation in fuel cost. The salaries of higher officials come under fixed cost and so it does not affect the cost of fuel.
Q9. If a 2-wire ac single phase distribution system operating at ‘P’ MW and ‘V’ kV, operating at the power factor of 0.8, then the current in the outer wire in kA is ______
Q10. What is the main reason for maintaining consumer end voltage within prescribed limit?
(a) Because it is declared by the supplier
(b) For satisfactory operation of electrical equipment
(c) For easy calculation of units supplied
(d) To reduce the line losses
Sol. All electrical equipment are designed to work at a certain voltage mentioned as voltage rating of that equipment. Change of supply voltage beyond a certain limit may cause malfunction or even damage to the equipment. So, the consumer end voltage must be maintained to a prescribed limit for satisfactory operation of consumer’s equipment.
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