Electrical Drives MCQ
- 17th Apr, 2021
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Electrical Drives MCQ Test
1) To save energy during braking-----------------braking is used?
2) The concept of V/f control of inverters driving induction motors resuls in
3) Which of the following are electrical braking methods ?
4) ———– was the first city in India to adopt electric traction.
5) Which of the following state capital is not on broad gauge track?
6) Which braking is not possible in series motor?
7) Polarity of supply voltage is reversed in which type of braking?
8) In industries which electrical braking is preferred?
9) Full form of VVVF control
10) What type electric drive is used in cranes?
11) An elevator drive is required to operate in
12) Electric drive is becoming more and more popular because
13) The basic elements of a electric drive are
14) Speed control by variation of field flux results in
15) A four quadrant operation requires
16) A motor has a thermal heating time constant of 50 mm. When the motor runs continuous of full scale, its final temperature rise is 80° C, what would be the temperature rise after 1 hour, if the motor runs continuously on full load?
17) In 4 quadrant operation of a hoist 3rd quadrant represents
18) High braking torque produced in
19) In case of kiln drives, starting torque is.
20) What are the constituents in speed time curve of train?
21) Which speed control method preferred for constant torque drive?
22) While operating on variable frequency supplies, the AC motor requires variable voltage in order to
Electrical Drives Online Test Questions (Electrical Drives FAQs)
1) What is an electrical drive?
An electrical drive is an equipment or machine that works on electricity. It basically converts electrical energy into mechanical energy.
2) List some applications of electrical drive?
Some applications of the electrical drive are:
- transportation systems
- hydraulic & electric motors
- diesel engines
3) What are AC and DC drives?
AC drives stand for Alternating Current drive that is used to control the frequency and variable speed.
DC drives stand for Direct Current Drive which is used to convert alternating current into direct current.
4) What are different parts of electrical drives?
The main parts of the electrical drives are:
- power modulator
- controlling unit
- sensing units
5) In electrical drives load torques can be classified into how many types?
In electrical drives load torques can be classified into two types that are:
- active load torques
- passive load torques
6) What is regenerative braking?
Regenerative braking is a technique used to convert the kinetic energy of an electric vehicle into stored energy in the vehicle's battery by slowing down the vehicle by applying breaks.
7) What are different modes of operation in electrical drives?
There are three different modes of operation in electrical drives:
- Acceleration including starting
- Deceleration including stopping
8) What is self-control mode of synchronous motors?
The self-controlled mode of synchronous motors changes the supply frequency so that the synchronous speed remains the same as that of the rotor speed.
9) What is brushless DC motor?
A Brushless DC motor does not contain permanent magnets on the outside of its structure instead, the permanent magnets are fixed on the rotor and the electromagnets are fixed on the stator.
10) What is Power modulator?
The power modulator is used to regulate the output power of the source and controls the power from the source to the motor is such that the motor transmits the speed-torque characteristic as per the requirement of the load.