SSC JE 2014 Electrical question paper with solution(Morning-Shift)

Ques 21. In a 7/2 digit voltmeter, the largest number that can be read is:

  1. 9999
  2. 0999
  3. 1999
  4. 5999

A 3 1/2 (7/2) digits digital multimeter has three full digits that can change from 0 to 9 and a one-half digit that can change to either 0 or 1. That means 3 1/2 digits digital multimeter can show values from 0 to 1,999 or 0 to -1,999.

 

Ques 22. In suburban services as compared with urban service:

  1. The coasting period is smaller but the free-running period is longer
  2. The coasting period is smaller
  3. The coasting period is longer
  4. The coasting period and free-running period are same

Speed time curve of urban and suburban service

 

In suburban service, the distance between two adjacent stop for the electric train is 1-8 Km while in urban service the distance between two adjacent stop is 1 km only therefore coasting period or deceleration period is longer in suburban service as compared to urban service

Ques 23. Quadrilateral speed time curve is used for

  1. Goods line service
  2. Suburban service
  3. Urban Service
  4. Urban and Suburban service

Quadrilateral speed time curve is used for urban and suburban service

 

Ques 24. Which of the following motor will give a relatively high starting torque?

  1. Shaded pole motor
  2. Capacitor start motor
  3. Capacitor run motor
  4. Split phase motor

A Capacitor Start Motors is a single phase Induction Motor that employs a capacitor in the auxiliary winding circuit to produce a greater phase difference between the current in the main and the auxiliary windings. Due to greater phase difference capacitor Start motors have very high starting torque for a single-phase AC motor.

 

Ques 25. The current in reverse bias in P-N junction diode maybe

  1. Between 2A and 5A
  2. Few micro or nano amperes
  3. Few milliamperes
  4. Between 0.2A and 2A

Reverse biasing means, applying an external voltage which is opposite in direction to forward bias i.e connecting the positive terminal of the battery to n-side of the diode and negative terminal of the battery to the p-side of the diode.

Under reverse bias, the diode does not conduct when the applied voltage is changed. The current remains constant at a negligibly small value (in the range of microamps) for a long-range of change in applied voltage.

 

Ques 26. The repulsion-start induction-run motor is used because of

  1. High starting torque
  2. Good Power factor
  3. High efficiency
  4. Minimum cost

  • A repulsion motor is a type of electric motor for using on alternating current (AC). It was formerly used as a traction motor for electric trains.
  • Repulsion motors are classified under single phase motors. In repulsion motors, the stator windings are connected directly to the AC power supply and the rotor is connected to a commutator and brush assembly, similar to that of a direct current (DC) motor
  • The starting torque of the repulsion start motor is 350 percent with moderate starting current.
  • It is usually applicable where starting period is of long duration because of high inertia of load. such as the high-speed lift.

 

Ques 27. Which of the following is the non-linear circuit parameter?

  1. Transistor
  2. Inductance
  3. Condenser
  4. Wire Wound Resistor

A linear circuit is an electric circuit in which circuit parameters (Resistance, inductance, capacitance, waveform, frequency etc) are constant. In other words, a circuit whose parameters are not changed with respect to Current and Voltage is called Linear Circuit.

Whereas in a non-linear circuit the parameters (Resistance, inductance, capacitance, etc) is not constant, is called Non-Linear Circuit.

Example : – Diode,transistor,SCR , transformer, iron core, inductor etc

 

Ques 28. The B-H curve is used to find the MMF of this section of the magnetic circuit. The section is:

  1. Vaccum
  2. Iron part
  3. Air gap
  4. Both iron part and air gap

The level of magnetic flux established in a ferromagnetic core is a direct function of the permeability of the material.Ferromagnetic materials have a very high level of permeability, while nonmagnetic materials such as air, vacuum, and wood have very low levels of permeability

 

Ques 29. A terminal where three or more branches meet is known as

  1. Mesh
  2. Node
  3. Terminus
  4. Loop

Junction point

A point where three or more branches meet is called a junction point.

Node

A point at which two or more elements are joined together is called a node. The junction points are also the nodes of the network.

 

Ques 30. For V-curve for synchronous motor, the graph is drawn between

  1. Armature current and power factor
  2. Field current and armature current
  3. Terminal voltage and load factor
  4. Power factor and field current

The Graph plotted between the armature current Ia and field current If at no load the curve is obtained known as V Curve. Since the shape of these curves is similar to the letter “V”, thus they are called V curve of the synchronous motor.

 

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7 Comments

    1. Chetan I will explain you the question tomorrow morning currently i am uploading the solution of SSC JE 2009. Sorry for the delay

  1. Ques no 95 have no answer.

    Answer would be option (B)

    And Questions no 96 has no figure.

    Please check and update it.

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