SSC JE 11 Oct 2023 PAPER I Electrical Part 7

SSC JE 11 Oct 2023 PAPER I Electrical Part 7

SSC JE 11 Oct 2023 PAPER I Electrical Part 7

SSC JE 11 Oct 2023 PAPER I Electrical Part 7

Q.51 In case of magnetic circuits, the product of the number of turns on a coil and the current flowing through the coil is called __________.

1. relative permeability
2. MMF
3. absolute permeability
4. EMF

Correct Option: 2

Q.52 Which of the following points clearly describe the need for a back-to-back converter connected to the rotor of a doubly fed induction generator [DFIG] used in wind power plants?(i) It feeds the rotor with currents of fixed frequency and thus, helps in achieving a fixed range of speed.(ii) It feeds the rotor with currents of varying frequency and thus, helps in achieving various ranges of speed.(iii) It helps in power factor correction by adjusting the active power output of the DFIG.(iv) It helps in power factor correction by adjusting the reactive power output of the DFIG.

1. (ii) and (iv)
2. (i) and (iv)
3. (i) and (iii)
4. (ii) and (iii)

Correct Option: 1

Q.53 Select the correct statement(s) with respect to the Francis turbine.A) It is used in medium heads and for moderate discharges.B) It is an axial-in radial-out type of turbine.C) It is an example of a mixed-flow turbine.

1. A and C
2. A and B
3. B and C
4. Only A

Correct Option: 1

SSC JE 11 Oct 2023 PAPER I Electrical Part 7

Q.54 The permanent magnet synchronous motor has a configuration almost identical to the conventional synchronous machine with the absence of _______________.

1. field winding and slip ring
2. air gap between stator and rotor
3. field winding and rotating magnetic field
4. stationary magnetic field

Correct Option: 1

Q.55 In the split-phase induction motor, the starting torque of the resistance start motor is about ____________ the full load torque.

1. 1.5 times
2. 150 times
3. 0.15 times
4. 15 times

Correct Option: 1

Q.56 A overhead transmission line is supported by supports at equal levels. If the length of the conductor span is increased by two times, the sag will ____. (Given, weight per unit length and tension in the conductor are constant.)

1. increase by two times
2. decrease by two times
3. decrease by four times
4. increase by four times

Correct Option: 4

SSC JE 11 Oct 2023 PAPER I Electrical Part 7

Q.57 How does the input impedance of a CRO affect its deflection sensitivity?

1. Lower input impedance leads to higher deflection sensitivity
2. The input impedance does not affect deflection sensitivity
3. Higher input impedance leads to higher deflection sensitivity
4. It is directly proportional at low input impedance and inversely proportional at high input impedance

Correct Option: 3

Q.58 A coil having a resistance of 8 Ω and an inductance of 0.01911 Henry is connected across a 230 V, 50 Hz AC supply. The reactive power is equal to ______.

1. 4.232 KVAR
2. 3.174 KVAR
3. 3.703 KVAR
4. 4.496 KVAR

Correct Option: 2

Q.59 The shaded-pole induction motors have _____________ compared with other motor types and may not be suitable for applications with ___________ or where precise speed control is necessary.

1. lower efficiency; light loads
2. lower efficiency; heavy loads
3. high efficiency; heavy loads
4. high efficiency; light loads

Correct Option: 2

SSC JE 11 Oct 2023 PAPER I Electrical Part 7

Q.60 Which of the following types of cooling is more economical for very large transformers of rating 100 MVA?

1. Oil forced water forced
2. Oil forced air forced
3. Oil natural air natural
4. Oil natural air forced

Correct Option: 1

Q.61 An AC circuit contains a resistance and inductance connected in series. The active power consumed by the circuit is equal to 4800 W and reactive power is 6400 VAR. Calculate the apparent power.

1. 8000 VA
2. 4233 VA
3. 11200 VA
4. 1058.3 VA

Correct Option: 1

Q.62 Which of the following is the outermost layer of an underground cable?

1. Insulation
2. Sheath
3. Armour
4. Serving

Correct Option: 4

SSC JE 11 Oct 2023 PAPER I Electrical Part 7

Q.63 Which option among the following is correctly associated with the ‘Auxiliary motor starting’?

1. A small direct-coupled induction motor, called pony motor, is used for the starting purpose of the synchronous motor.
2. A squirrel cage winding is used for the starting purpose of the starting of the synchronous motor.
3. A DC supply and DC compound motor is used for the starting purpose of the starting of the synchronous motor.
4. A damper winding is used for the starting purpose of the starting of the synchronous motor.

Correct Option: 1

Q.67 The value of a series resistor is required to limit the current through an LED to 36mA with a forward voltage drop of 3V, when connected to a 12V supply.

1. 250 m Ω
2. 25 Ω
3. 4000 Ω
4. 250 Ω

Correct Option: 4

SSC JE 11 Oct 2023 PAPER I Electrical Part 7

Q.68 Which of the following CANNOT be caused due to excessive voltage drop in an electric distribution system?

1. Electric motors to run colder than normal
2. Electric heaters to heat poorly
3. Electriclights to flicker
4. Electric lights to burn dimly

Correct Option: 1

Q.69 A 230 V, 3-phase voltage is applied to a balance delta connected 3-phase load of phase impedance (15 + j 20) Ω. What is the power consumed per phase?

1. 1269.6 W
2. 1161.6 W
3. 3807.6 W
4. 2198.3 W

Correct Option: 1

Q.70 Which of the following measurement instruments consumes the least amount of energy?

1. Moving iron type
2. PMMC type
3. Induction type
4. Dynamometer type

Correct Option: 2

Q.71 Which of the following is NOT an application of shaded-pole induction motor?

1. Fans for refrigeration
2. A lift of a building
3. Table fan
4. Hair drier

Correct Option: 2

SSC JE 11 Oct 2023 PAPER I Electrical Part 7

Q.72 In the spilt-phase induction motor, maximum torque is about _____________ the full load torque at about 75% of the synchronous speed.

1. 250 times
2. 0.25 times
3. 25 times
4. 2.5 times

Correct Option: 4

Q.73 Which of the following information is NOT present on the nameplate of a transformer?

1. Rated frequency
2. kVA or MVA rating
3. Frame size
4. Insulation class

Correct Option: 3

Q.74 What is the reason for providing corrugated or radiators on the sides of transformer tanks?

1. To reduce the size of the transformer tank
2. To provide sufficient cooling area
3. To provide very small surface area to dissipate heat generated
4. To increase the dielectric strength of the oil

Correct Option: 2

SSC JE 11 Oct 2023 PAPER I Electrical Part 7

Q.75 The main reason to amplify the input signals by using vertical amplifier is:

1. they are not strong to provide deflection that can be measured
2. they provide attenuation
3. they provide low stability
4. the input impedance is low

Correct Option: 1

SSC JE 11 Oct 2023 PAPER I Electrical Part 7

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