Quiz: Electrical Engineering 12 Apr 2021

Quiz: Electrical Engineering
Topic: Miscellaneous

Each question carries 1 mark.
Negative marking: 1/3 mark
Time: 10 Minute

Q1. Determine the deflection factor (in V/m) of a CRO, when the deflection sensitivity of the CRO is 5 m/V.
(a) 0.25
(b) 0.35
(c) 0.20
(d) 0.40

Q2. A 10 Ω resistive load is to be impedance matched by a transformer to a source with 6250 Ω of internal resistance. The ratio of primary to secondary turns of transformer should be:
(a) 10
(b) 20
(c) 15
(d) 25

Q3. The mmf produced by interpole is proportional to
(a) Armature current
(b) Field current
(c) Armature voltage
(d) 1/field current

Q4. In a split phase induction motor, the running winding should have
(a) Low resistance and high inductance
(b) High resistance and low inductance
(c) Low resistance as well as low inductance
(d) High resistance as well as high inductance

Q5. Which one of the following statements is correct?
Corona loss increase with
(a) decreases in conductor size and increase in supply frequency
(b) increase in both conductor size and supply frequency
(c) decrease in both conductor size and supply frequency
(d) increase in conductor size and decrease in supply frequency

Q6. In a three-phase system, the relation V_L=V_ph is applicable to a __.
(a) star-connected without neutral point
(b) star-connected load
(c) both a and b
(d) delta-connected load

Q7. In a star connected three-phase balanced system. If the line current is 125A then the phase current is?
(a) 216.5 A
(b) 72.16 A
(c) 250 A
(d) 125 A

Q8. If the alternating current equation, is I = 64.8 sin 423t. what will be the average current?
(a) 41.21 A
(b) 67.45 A
(c) 5.99 A
(d) 56.78 A

Q9. For induction motors at low values of slip:
(a) The torque slip is approximately a hyperbola
(b) The torque slip is approximately a straight line
(c) The torque slip curve is at its maximum
(d) The torque slip is approximately a parabola

Q10. A generating station supplies the following loads 15000 kW, 8500 kW, 6000 kW and 450 kW. The station has maximum demand of 22000 kW. Calculate the diversity factor.
(a) 0.68
(b) 1.34
(c) 1.91
(d) 0.52



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