Top Electrical Engg MCQ - 500+ MCQ
141
For which of the applications a reluctance motor is preferred?
142
In a Bipolar Junction Transistor (BJT), the relationship between common-base current gain (α) and common-emitter current gain (β) is:
143
A cable has an insulation of relative permittivity 2. If the insulation is replaced by one of relative permittivity 4, the capacitance of the cable will become
144
Synchronous motors are not used for _______ applications.
145
The power factor of a spot welding machine is expected to be around:
146
Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because
147
What is the peak value of the alternating voltage (in V) having an average value of 180 V?
148
Which of the following statement is incorrect?
149
The core of a large power transformer is usually made of:
150
The primary purpose of using a starter with a DC motor is to:
151
In an electronic circuit transistor is used for switching ON and OFF a relay, when the transistor switches OFF the relay, a higher voltage appears across the transistor. How can a transistor be protected from this voltage?
152
Kirchhoff's Voltage Law (KVL) is based on the principle of conservation of:
153
A 3-phase delta connected system is supplied by a line voltage of 400 V. The value of phase current is 70 A. What is the power (in kW) consumed by the system, if the current lags the voltage by 60 degrees?
154
The speed of an AC motor depends on____:
155
Permanent Magnet Moving Coil (PMMC) instruments have a:
156
The interpoles in dc machines have a tapering shape in order to
157
The standard SI unit of luminous flux is the:
158
Which one of the following is the dimensional formula resistivity?
159
For normal operation of a transistor, the collector-base junction is–
160
The power factor of a synchronous motor can be made to run at _____.