Electrical Engineering Quiz 13
1 / 50
In which of the following motors the stator and rotor magnetic field rotate at the same speed?
2 / 50
In which of the following motors the stator and rotor fields rotate simultaneously?
3 / 50
Which of the following is the least expensive protection for overcurrent is low voltage system ?
4 / 50
Current velocity through a copper conductor is___________?
5 / 50
The control method used for PWM dc ? dc converter is______________?
6 / 50
Normally, which of the following is used, when a large-scale conversion from AC to D.C. power is required ?
7 / 50
In a single phase motor the centrifugal switch____________?
8 / 50
A synchronous motor working at leading power factor can be used as____________?
9 / 50
Usually wide and sensitive speed control is desired in case of____________?
10 / 50
If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then_____________?
11 / 50
An ideal transformer is one which has_____________?
12 / 50
The back e.m.f. of a synchronous motor depends on______________?
13 / 50
The dimensions of L/CR are that of _______________?
14 / 50
Harmonics in transformer result in___________?
15 / 50
A closed loop system is distinguished from open loop system by which of the following ?
16 / 50
When a transistor amplifier is operating, the current in any branch is _______________?
17 / 50
Generating capacity connected to the bus bars and ready to take load when switched on is known as____________?
18 / 50
Which of the following is an advantage of hydrogen cooling ?
19 / 50
Kirchhoff s law is not applicable to circuits with____________?
20 / 50
A capacitor consists of two____________?
21 / 50
The speed control of universal motor used for sewing machines is by____________?
22 / 50
The tail current in a differential amplifier equals ______________?
23 / 50
The cylindrical windings using circular conductors are used for current rating of____________?
24 / 50
Overhead lines generally use__________________?
25 / 50
The input impedance of a differential amplifier equals r?e times________________?
26 / 50
A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be______________?
27 / 50
The armature torque of the D.C. shunt motor is proportional to____________?
28 / 50
For transmission of power over a distance of 200 km, the transmission voltage should be_________kv?
29 / 50
In an SCR circuit, the angle of conduction can be changed by__________________?
30 / 50
A.C. network analyser is used to solve problems of_______________?
31 / 50
Commercial available medium size machines have a speed range of __________ ?
32 / 50
Where unpulverised coal has to be used and boiler capacity is large, the stoker which is used is______________?
33 / 50
Energy consumption in propelling the train is required for which of the following?
34 / 50
Large industrial consumers are supplied electrical energy at__________________?
35 / 50
The phase difference between the output and input voltages of a CE amplifier is _____________?
36 / 50
An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4?10-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is____________?
37 / 50
Which of the following type of materials are not very important for engineering applications ?
38 / 50
Operational amplifiers use ________________?
39 / 50
Quartz crystal is most commonly used in crystal oscillators because:____________?
40 / 50
Which of the following methods is used for laying of underground cables ?
41 / 50
at a point may be defined as equal to the lines of force passing normally through a unit cross section at that point ?
42 / 50
In case the air gap in an induction motor is increased____________?
43 / 50
In a lossless inverter, the average power absorbed in one period by the load must be__________?
44 / 50
Which of the following brushes can be used for high values of current density ?
45 / 50
A capacitance is a circuit component that opposes the change in circuit__________?
46 / 50
The Q of a tuned circuit refers to the property of_______________?
47 / 50
Which method of braking is generally used in elevators ?
48 / 50
Which of the following is the voltage for single phase A.C. system ?
49 / 50
The relative permittivity of rubber is____________?
50 / 50
In a transistor amplifier circuit VCE = VCB +________________?
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