A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.For each of the following multiple choice questions, choose the most appropriate answer :
1. What is the effect of moisture content of the soil on earth soil resistance?
A. Increases
B. Decreases
C. No effect
D. Variable
2. AC power in a load can be controlled by using
A. two SCRs in parallel opposition
B. two SCRs in series
C. three SCRs in series
D. four SCRs in series
3. Field flux is constant in
A. Compound motor
B. Shunt motor
C. Series motor
D. None of these
4. Varnish coating is done on winding in order to :
A. Increase insulation of windings
B. Make windings vibration less
C. Provide an additional insulation layer on the windings
D. All these
5. Which conduit wiring system done inside the concrete plaster or wall?
A. Surface
B. Concealed
C. Recessed
D. B and C
6. When cables are drawn through the conduit and terminated at the outlet or switch points, the system of wiring is called :
A. Conduit wiring
B. Cleat wiring
C. Batten wiring
D. None of these
7. A solid sphere of radius R made of a material of bulk modulus K is completely immersed in a liquid in a cylindrical container. A mass less piston of area A floats on the surface of the liquid; When a mass M is placed on the piston to compress the liquid, the fractional change in the radius of the sphere, is given byA body of mass 500 g is fastened to one end of a steel wire of length 2 m and area of cross-section 2 mm2. if the breaking stress of he wire is 1.25 × 107 N/m2, then the maximum angular velocity with which the body can be rotated in a horizontal circle is
A. 2 rad/s
B. 3 rad/s
C. 4 rad/s
D. 5 rad/s
8. The stator of split phase induction motor has two windings, main winding and auxiliary winding. These windings are displaced in space by
A. 30 electrical degrees
B. 90 electrical degrees
C. 120 electrical degrees
D. 180 electrical degrees
9. During AC signal measurement, what needs to be adjusted to stabilize waveform on the screen?
A. Focus
B. V/Div
C. AC/DC
D. Time/Div
10. Underground system cannot be operated above :
A. 220kV
B. 66kV
C. 33kV
D. 11 kV
11. The bulk modulus of a gas is 6 × 103 N/m2. the additional pressure needed to reduce the volume of the gas by 10% is
A. 300 N/m2
B. 400 N/m2
C. 1000 N/m2
D. 600 N/m2
12. Which cables are used to provide local area networks in schools offices?
A. UTP
B. PVS
C. PVC
D. TRS
13. Positive logic in logic circuit is one in which :
A. Logic 0 and 1 are represented by 0 and positive voltage respectively
B. Logic 0 and 1 are represented by negative and positive voltage respectively
C. Logic 0 voltage level is higher than logic 1 voltage level
D. Logic 0 voltage level is lower than logic 1 voltage level
14. Minimum cross-sectional area in mm2 of the conductor for final sub-circuit for copper and aluminium circuits :
A. 1.5,2.0
B. 1.0,2.0
C. 1.0,1.5
D. 1.5,1.0
15. An SCR can exercise control over . of AC supply
A. Positive half-cycles only
B. Negative half-cycles only
C. Both positive and negative half-cycles
D. Positive or negative half-cycles
16. Probability of the event that might occur X Severity of the event if it occurs
A. Accident
B. Hazard
C. Risk
D. None of the above
17. How many 15 A socket outlets are needed in kitchen?
A. 1
B. 2
C. 4
D. 6
18. Which is not a type of conduit wiring?
A. Rigid steel conduits
B. Rigid non-metallic conduits
C. Flexible conduits
D. TRS wiring
19. To compress a liquid by 10% of its original volume, the pressure required is 2 × 105 N/m2. the bulk modulus of the liquid is
A. 2 × 104 N/m2
B. 2 × 105 N/m2
C. 2 × 107 N/m2
D. 2 × 106 N/m2
20. For variable heads just under 30 metres which type of turbines is used in hydropower stations?
A. Pelton
B. Kaplan
C. Francis
D. None of these
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